s

Abstract: The increasing short channel effect is posing greater challenge to all aspects of semiconductor industry for 22 nm technology node and beyond. Fully depleted silicon on insulator(FDSOI) is a promising new technology for 22 nm node and beyond and has demonstrated several advantages including outstanding short-channel effect control. We used simulating software TCAD to study the impacts of different thickness of buried-oxide layer on performance of FDSOI devices. We studied the impacts of thinned BOX layer and applying back-gate bias(Vbg) on short-channel effects(SCE) of FDSOI devices and explained the mechanism of the phenomenon. Simulation results suggest that FDSOI devices with Ultra-thin BOX(UTB) structure demonstrates a much lowerIoffand better DIBL performance comparing to thick BOX FDSOI devices.Vbgon UTB FDSOI devices modulates the threshold voltage of the FDSOI devices sensitively. Under appropriateVbg, the SS and DIBL performance of the FDSOI devices improve, indicating better SCE control. Experimental results verified the conclusions made by simulation results. 25 nm-BOX FDSOI devices demonstrate a 50% smallerIoffthan 145 nm-BOX FDSOI devices and a much better DIBL performance.

Key words: FDSOI; Ultra-thin BOX(UTB); Simulation; Short-channel effect(SCE); Back-gate bias

Deep tight reservoir characteristics and main controlling factors of Badaowan formation in the central Junggar basin/2017,41(1):1-10

Sun Jing, Xue Jingjing, Zeng Delong, Wang Ran, Wang Feng, Li Hui

(ResearchInstituteofExplorationandDevelopment,XinjiangOilfieldCompany,PetroChina,Karamay,Xinjiang834000,China)

Abstract: Tight reservoir macroscopic and microscopic characteristics and main controlling factors of quality of lower Jurassic Badaowan formation in Mosuowan-Mobei area of Junggar basin were studied by using integrated cores, well logging, thin section identification, scan election microscope(SEM) and analysis assay data. The results show that it is the typical deep low and ultra-low porosity and permeability tight clastic rock reservoir. Reservoir sand body is mainly shallow water delta front subaqueous distributary channel fine and middle-fine lithic sandstone, compositional maturity and cement volume fraction are low, debris and plastic lithic volume fraction are high. Diagenesis mainly includes destructive pressure solution and cementation and constructive dissolution. The pore in vertical is mainly located in two porosity evolution zones, the mixing-stable and secondary-increasing. The pore throat is the middle-fine pore-fine throat with poor size, distribution, sorting, connectivity and percolation ability. The main controlling factors of reservoir quality(physical property) are sedimentary facies, diagenesis and abnormal pressure which together determine original and present physical properties of reservoir. The results provide a basis for further exploration and development of deep tight oil and gas reservoir in the basin.

deep tight reservoir; reservoir characteristics; reservoir quality; controlling factors; Badaowan formation; Junggar basin

Controlling factors for the development of high-quality source rocks in Yellow River mouth east sag of Bohai bay basin/2017,41(1):11-20

Xu Ting1,2, Hou Dujie1,2, Zhao Zibin1,2, Wang Ye1,2, Xu Changgui3, Wang Feilong3

( 1.SchoolofEnergyResources,ChinaUniversityofGeosciences(Beijing),Beijing100083,China; 2.MOEKeyLaboratoryofMarineReservoirEvolutionandHydrocarbonAccumulationMechanism,ChinaUniversityofGeosciences(Beijing),Beijing100083,China; 3.TianjinBranch,CNOOC,Tianjin300452,China)

Abstract: Based on rock pyrolysis analysis and Gas Chromatograph-Mass Spectrometry(GC/MS) of saturated and aromatic hydrocarbon on three sets of hydrocarbon source rock samples in Yellow River mouth east sag, the geochemical characteristics of theses source rocks have been studied, the intervals of high-quality source rocks have been identified and the controlling factors have been analyzed. Research shows that there are high-quality source rocks with high abundance of organic matter, good organic types and strong hydrocarbon-generation potential in all E2s3, E3s1-2and E3dLin Yellow River mouth east sag. Of these, source rocks in E2s3have large thickness, maximum abundance of organic matter and best organic types(mainly Ⅱ1and Ⅰ), what is more, they have reached hydrocarbon generation threshold, thus high-quality source rocks are best developed. Source rocks in E3s1-2come second. They have high abundance of organic matter, good organic types(mainly Ⅱ1), thus high-quality source rocks are well developed. Source rocks in E3dL, whose abundance of organic matter has mainly achieved good quality standards and main organic type is Ⅱ2, are relatively poorly qualified. Compared to the former, their abundance of organic matter and organic matter types are worse. The development of source rocks is controlled by tectonics, paleoclimate, productivity of basin and preservation condition for organic matter. Due to hot and humid climate during sedimentary period, high level of productivity contributed by massive input of algae and good preservation condition for organic matter with semi deep-deep lake reducing environment, source rocks in E2s3have relatively high organic contents on the whole. While E3s1-2was deposited in a period with lower air temperature and algal blooming, so its source rocks have a high level of paleoproductivity. Low ratios of Pr/Ph and high ratios of gammacerane/C30-hopane reflect high salinity of water, strong oxygen-deficient reducing environments during deposition and favourable preservation conditions for organic matter. During the sedimentary period of source rocks in E3dL, the climate was warm and semihumid, and the mixed source was dominant in the biological source composition with more input from terrestrial higher plants, and the reducing fresh water environment is the main sedimentary environment. In general, its productivity level and preservation condition are relatively worse than the two formers', leading to lower organic content as a whole and worse organic matter types.

Key words: Yellow River mouth east sag; high-quality source rock; paleoproductivity; depositional environment; organic preservation condition; Bohai bay basin

Diagenesis and porosity evolution of sandstone reservoir in the lower Jurassic Badaowan formation in Chepaizi area, Junggar basin/2017,41(1):21-32

Wan Qingqing1,2, Liu Luofu1,2, Xiao Fei1,2, Chang Min1,2, Hu Qing1,2, Zheng Shanshan1,2

( 1.StateKeyLaboratoryofPetroleumResourcesandProspecting,ChinaUniversityofPetroleum(Beijing),Beijing102249,China; 2.BasinandReservoirResearchCenter,ChinaUniversityofPetroleum(Beijing),Beijing102249,China)

Abstract: A major breakthrough has been made in oil and gas exploration in the Badaowan formation in the Chepaizi area of the Junggar basin, but the diagenesis research in this area is still relatively weak. A comprehensive diagenesis study of the strata was conducted through various test methods. Thin section and SEM observation were conducted to determine diagenetic type and sequence. Cathodoluminscence (CL) was used to identify the period of calcite cementation, development degree of quartz overgrowth and distribution characteristics of kaolinite. The composition of clay minerals and the content of each mineral were determined by X-ray diffraction. Formation temperature of authigenic calcite cement was determined by oxygen isotope analysis. The evolution processes of reservoir porosity were quantitatively studied by inversion and back-stripping method. The results show that the reservoirs are mainly subjected to compaction, cementation of calcite, quartz, pyrite and the dissolution of feldspar and quartz. Formation temperatures of calcite cement range from 40℃ to 85 ℃, corresponding to diagenetic stage between late eodiagenetic phase A and eodiagenetic phase B. Clay minerals are dominant with kaolinite due to feldspar dissolution. The process of reservoir porosity evolution can be divided into three stages: Rapid compaction stage, compaction-cementation stage and compaction-dissolution stage. The results provide a geological basis for the oil and gas exploration of the Badaowan formation in the Chepaizi area.

Key words: porosity evolution; diagenetic sequence; diagenetic stage; Badaowan formation; Chepaizi area; Junggar basin

Sedimentary features and sedimentary evolution of the shelf-margin delta in late Oligocene of southeast Baiyun sag/2017,41(1):33-42

Wang Siqi1, Zhang Zhongtao2, Lin Changsong3, Qin Chenggang2, Xing Zuochang1

( 1.SchoolofEnergy,ChinaUniversityofGeosciences(Beijing),Beijing100083,China; 2.InstituteofShenzhenBranchCompanyofChinaNationalOffshorePetroleumCorporation,Shenzhen,Guangdong510240,China; 3.SchoolofMarineandOcean,ChinaUniversityofGeosciences(Beijing),Beijing100083,China)

Abstract: We established the third-order sequence stratigraphic framework and revealed the structures and geomorphology of a large-scale shelf-margin delta in the deep-water area of the late Oligocene Baiyun sag, based on an integrated analysis of cores, well-logs and three dimensional seismic data. Result shows: Seven third-order sequences are recognized in Zhuhai and the lower Zhujiang formation of the sag, three stages of shelf-margin deltas were revealed in contain distribute in the upper part of ZHSQ5, ZHSQ6 and ZHJSQ1, respectively. The shelf-margin delta of the ZHSQ5 period was small and mud-rich, with the pre-delta was 300 m thick and an oblique progradation configuration in the front-delta. The shelf-margin delta in the ZHSQ6 period was wide lateral distribution about 5 km, S-shape progradation in seismic data, a thinning phenomenon in the foreset body toward the basin, and some small-scale slump bodies in the distal slope of the pre-delta. The shelf-margin delta in the ZHJSQ1 period inherited the depositional characteristics of that in of ZHJSQ1 period, but with some larger slump turbidite fan in the fore-slope. The delta was deposited in a paleo-water depth about 600 m, with the calculated front slope angle 4°～7°. It indicates a deep-water shelf-edge environment. The relative sea-level changed and sediment supply co-controlled the formation time and scale of the shelf-margin delta, and the syn-depositional faults controlled its morphology and location. The barrier bar, distributary channel and turbiditic sand in the shelf delta are potential reservoir.

Key words: Baiyun sag; late Oligocene; shelf-margin delta; sedimentary structure; sedimentary geomorphology

Tectonic evolution of eastern Liaohe offshore and hydrocarbon accumulation of interior buried hill/2017,41(1):43-51

Wang Chun, Zhang Yan, Wu Xiaozhou, Ma Xiaoyu, Huang Yucheng, Song Zhihui

(ResearchInstituteofPetroleumExplorationandDevelopment,PetroChina,Beijing, 100083,China)

Abstract: The tectonic evolution of the Tanlu fault zone occurred in the Paleogene and the Cenozoic, respectively, which resulted in a relatively complex tectonic evolution in the eastern part of the Liaohe offshore area. Based on the detailed explanation of seismic data, structural analysis and reservoir prediction, this paper analyzes the tectonic evolution process and the oil and gas migration and accumulation in the eastern part of Liaohe offshore area. The results show that the NE and the EW-induced Mesozoic-Paleozoic faults form the insidious form of the Yannan buried hill belt, and the thickness of the Ordovician reservoir in the northern part of the buried mountain belt is large and the fracture development degree is high. The Mesozoic sedimentary study in the eastern part of the sedimentary area in the eastern part of the Miocene is characterized by the uprooting of the Yannan fault in the Oligocene, affecting the plane and longitudinal form of the buried hill belt, and opening the oil and gas to the buried hill trail the movement of the passage. This study not only indicates the favorable target of the future exploration in the eastern of Liaohe offshore area, but also can provides some reference for the buried hill exploration in the lower Liaohe-Liaodong Bay area.

Key words: eastern Liaohe offshore; tectonic evolution; interior buried hill; oil and gas migration

Sedimentary and sequence characteristics of Leikoupo formation's gas pool 4 in the western Sichuan basin and their control on reservoir development/2017,41(1):52-62

Shi Yunqing1,2,3, Li Hongtao1,2,3, Xiao Kaihua1,2,3, Feng Qiong1,2,3

(1.StateKeyLaboratoryofShaleOilandGasEnrichmentMechanismsandEffective,Beijing100083,China; 2.ExplorationandProductionResearchInstituteofSINOPEC,Beijing100083,China; 3.KeyLaboratoryforMarineOilandGasExploitationofSINOPEC,Beijing100083,China)

Abstract: In order to determine the favorable reservoir development of gas reservoirs in the western part of the middle area west Sichuan depression, based on detailed observation of cores, thin section from well cores samples under microscope observation, combined with logging curves characteristics analysis and seismic data, sedimentary sequence characteristics from middle Triassic Leikoupo formation 4(Lei member 4) are investigated in the western part of the middle area west Sichuan depression. The control factors of reservoir development controlled by sedimentary sequence are analyzed. The research results show that Leikoupo formation can be divided into one third-order sequences and three fourth-order sequences, and Leikoupo formation 4 upper sub-member are located at the uppermost fourth-order sequences and may be further divided into four fifth-order sequences and multiple sixth-order sequences. High frequency sequence has the characteristics of sedimentary assemblages obviously tapering upward. The high frequency sequence type is similar to the well and their horizontal comparison is good, which shows they were deposited in the similarity of sedimentary environment. The sedimentary environment mainly belongs to tidal flat deposits in the western part of the middle area west Sichuan depression and the tidal flat deposits mainly develop intertidal zone and subtidal zone sub-facies. The lithology of flat deposits varies in the vertical lithology and is more stable in horizontal orientation. The intertidal zone is advantageous sub-facies of reservoir development. Reservoirs generally are dominated by class Ⅱ and class Ⅲ reservoir. The favorable location of reservoirs development is mainly distributed in middle-upper part of the upper reservoir and the lower reservoir, corresponding to the location in the middle and upper part of the five-order and six-orderl high frequency sequence, respectively. The favorable intertidal litho-facies distribution of reservoir development is controlled by high frequency sequence reflecting sea level change, which also has a certain impact to late diagenesis. The high frequency sequence is the key factor to affect reservoir development and spatial distribution.

Key words: the western part of the middle area west Sichuan depression; Leikoupo formation member 4; sequence stratigraphy; sedimentary characteristics; reservoir distribution; controlling factor

The alluvial fan reservoir modeling based on seismic inversion data and multiple information constraint/2017,41(1):63-72

Zhao Lei1,2, Ke Ling3, Duan Taizhong1, Wang Mingchuan1, Shang Xiaofei1, He Tingting1

( 1.Exploration&ProductionResearchInstitute,SINOPEC,Beijing100083,China; 2.PostdoctoralCenter,ChinaUniversityofPetroleum,Beijing102249,China; 3.ResearchInstituteofChinaNationalOffshoreOilCorporation,Beijing100027,China)

Abstract: Oilfields in the early development phase has limited well data and large well spaces, which makes it difficult to describe the reservoir accurately. The post-stack seismic inversion data is used to study sedimentary facies and quantitatively analyze microfacies, whose results provide detailed geological parameters for the 3D model. Meanwhile, the shale model is established by using logging data as hard data, with controls from sedimentary facies and inversion synergetics. It's shown that the model is constrained by a variety of information including seismic inversion data, which combines the advantages of high vertical precision from wireline logging data and high horizontal accuracy from seismic data, to achieve reservoir fine description in the exploration and development stage.

Key words: seismic inversion; reservoir modeling; multi information constraint; alluvial fan

Hydrocarbon accumulation stages of deep reservoir in Huajia tectonic zone of Dehui depression of Songliao basin based on evidence of fluid inclusions /2017,41(1):73-81

Zhao Yutao1, Shao Mingli1, Jia Kexin1, Lin Shuang2, Tang Min1

( 1.ExploitationandDevelopmentResearchInstituteofJinlinOilfieldCompany,CNPC,Songyuan,Jilin138000,China; 2.PetroleumProductionTechnologyResearchInstituteofJilinOilfieldCompany,CNPC,Songyuan,Jilin138000,China)

Abstract: There are characteristics of multi-period hydrocarbon charging in Dehui depression of Songliao basin. Because of complex tectonic movement, the primary reservoirs are adjusted and reconstructed. By the way of fluid inclusion analysis technique, combining with burial-thermal history and analyzing the lithofacies features of hydrocarbon inclusion and the homogeneous temperature of aqueous inclusion associating with hydrocarbon inclusion, conclusions have been reached that deep reservoirs have three stages of hydrocarbon charging and two stages of adjusting and reconstructing: The first charging event took place at the end of Shahezi group deposition period(141.5～135.0 Ma). The second charging event happened during the end of Denglouku group deposition period to Qingshankou group deposition period(116.0～91.5 Ma). The third charging event occurred during Nenjiang group deposition period(81.0～72.5 Ma). The first time of adjustment and reconstruction about oil happened from the end of Yingcheng group deposition to the early of Denglouku group deposition period. The second time of adjustment and reconstruction about oil and the first time of adjustment and reconstruction about gas were adjusted and reconstructed during neogene period. Therefore, Dehui depression has experienced complex process of hydrocarbon accumulation.

Key words: hydrocarbon accumulation stages; fluid inclusion; lithofacies features; Huajia tectonic zone; Dehui depression; Songliao basin

Sequence stratigraphy classification and its geologic implications of Ordovician Yingshan formation in Gucheng area, Tarim basin/2017,41(1):82-96

Liu Ce, Zhang Yijie, Li Honghui, Cao Yinghui, Zhao Yimin, Yang Min, Zhou Bo

(ResearchInstituteofPetroleumExplorationandDevelopment,PetroChina,Beijing100083,China)

Abstract: In recent years, Gucheng area becomes the new risk exploration field in Tarim basin. For the next phase of exploration, identifying the sedimentary environment and establishing sequence stratigraphic framework has become the urgent demand. We analyzed the petrologic, seismic and logging features of Yingshan formation and made the experimental analysis of 5 wells core for C and O isotope. The research shows that the Yingshan formation in Gucheng area can be divided into two third-order sequences. During the SQ1 sedimentary period, Gucheng area developed restricted-open platform with rimmed platform margin. Under the SB2 which is obviously a parallel unconformity surface with geogenetic karstification, it is the main controlling factor to reservoirs scale. Because of the rapid transgression, during SQ2, the study area turned to the open platform environment. The expose intensity and time near the SB3 were less than SB2, therefore its ability to control regional reservoir development was weak. The boundary of sequence SQ1 and SQ2 roughly corresponded to the boundary of the third section dolomite and the second section limestone of Yingshan formation on the rock stratigraphic unit, and it showed significant carbon isotope negative drift near the SB2. On the basis of division of the third-order sequence, 8～9 fourth-order sequences were identified in the SQ1, and 4～6 fourth-order sequences were identified in the SQ2. Transgressive system tract is mainly symmetry aggradation stacking patterns, HST showed upward tapering aggradation progradation stacking patterns. The fourth-order sequence interface have the limited control function on the reservoir, it mainly developed penecontemporaneous karstification which was overlapped with the high site of ancient landform then formed an isolated lens reservoir in a small area. Ordovian in Gucheng area was little affected by Cledonian movement and it didn't develop remarkable weathering karstifications which is just like the central uplift in Tarim. Therefore, the superposition zone of advantageous sedimentary facies belt and the third-fourth-order sequence interfaces are the main exploration target of regional high quality reservoirs.

Key words: sequence stratigraphy; Ordovician; reservoir; Gucheng area; Yingshan formation; Tarim basin

Diagenesis of Dongying formation in Liaodong upliftand and its effects on reservoir quality of sandstone/2017,41(1):97-105

Zhang Wenkai1,2, Lyu Zhengxiang1,2, Shen Zhongmin1,2, Liu Sibing1,2

( 1.StateKeyLaboratoryofOilandGasReservoirGeologyandExploration,ChengduUniversityofTechnology,Chengdu,Sichuan610059,China; 2.SchoolofEnergyResources,ChengduUniversityofTechnology,Chengdu,Sichuan610059,China)

Abstract: In order to identify the sandstone reservoir features of Dongying formation in Liaodong uplift, researches are conducted on the petrologic features, the diagenesis features and its effects on reservoir by polarizing microscope, scanning electron microscope, rock pyrolysis, X-ray diffraction, temperature measuring of fluid inclusions and so on. It turns out that the main rock types of the reservoirs of Dongying formation are lithic arkose and feldspar lithic sandstone with low matrix content. The diagenesis stages of reservoir in the target area is between early diagenesis B stage and middle diagenesis A stage. The main diagenesis includes compaction, cementation, and dissolution. The early compaction, early calcite cementation and mid-late authigenic kaolinite filling are major factors to destroy the pore reservoir. The mid-late feldspar dissolution is an important diagenesis in reforming the reservoir physical property. The amount of primary pore is controlled by the sedimentation and the transformation of primary pore and the content of secondary porosity are determined by diagenesis. This study will provide the supports to the oil and gas exploration of the Dongying formation in Liaodong uplift, and it is helpful to reservoir researches in other areas of Liaodong Bay with similar characteristics.

Key words: Liaodong uplift; Dongying formation; diagenesis; diagenetic stage; reservoir characteristics

Eigenvalue buckling analysis of H type honeycombed composite column with rectangular concrete-filled steel tube flanges/2017,41(1):106-116

Ji Jing1, Xu Zhichao1, Zhang Wenfu1,2, Shen Jing3, Zhou Lijian1, Liu Yingchun1, Lu Zhaohong1, Wang Binzhou4

( 1.HeilongjiangKeyLaboratoryofDisasterPrevention,MitigationandProtectionEngineering,NortheastPetroleumUniversity,Daqing,Heilongjiang163318,China; 2.SchoolofCivilEngineering,NanjingInstituteofTechnology,Nanjing,Jiangsu211167,China; 3.OilRecoveryPlantNo.2,DaqingOilfieldCompanyLimited,Daqing,Heilongjiang, 163414,China; 4.NortheastOilSalesBranch,PetroChinaCompanyLimited,Shenyang,Liaoning110013,China)

Abstract: In order to study the overall stability of STHCC, the section form, constraint condition, component length and the concrete grade for the parameters, 11 different section forms of H type honeycomb steel column and 18 STHCC components were designed. Using ABAQUS software to establish the finite element model of 29 H honeycomb steel columns, the eigenvalue buckling analysis is carried out based on the simplified mechanical model and constitutive model. Through comparing the simulation analysis and theoretical results of the STHCC, both of which are in good agreement, the rationality of the finite element model is verified in this paper. The eigenvalue buckling analysis of 18 STHCC is carried out based on the above mentioned. The deformation cloud and buckling load in the first order mode are extracted and compared. The variation law of buckling load and deformation under different cross section form, slenderness ratio, constraint mode and concrete grade condition were investigated. The results show that the honeycomb shaped web plate can not only reduce the amount of steel, but also affect the stability of the component. The overall stability of the STHCC component is better than that of the common H type steel column and the flange of the steel tube H type steel column. Under the same conditions, compared with the ordinary H steel column and H type steel column with flange for steel tube, the STHCC can increase the buckling load by 1.88 times and 1.23 times. After the STHCC member flange of the steel pipe is provided with the stiffening rib, the buckling load will be increased by 1.31 times, and the overall stability of the composite column can be greatly improved by adding stiffening rib reasonably. With the increase of the concrete strength grade, the growth rate of the buckling load decreases gradually. Thepcrcalculation formula of buckling load of STHCC component is established by the simplified coefficientβbased on the finite element numerical solution. The buckling mode can provide the initial imperfection for the nonlinear stability. Lastly the design proposal of this new type of composite column in practical engineering is given.

Key words: H type honeycomb composite column; concrete-filled steel tubes; ABAQUS; eigenvalue buckling; buckling load; design proposal

The impacts of ultra-thin buried-oxide on short-channel effects of FDSOI devices/2017,41(1):117-122

Tan Sihao1,2, Li Yudong1,2, Xu Yefeng1,2, Yan Jiang1,2

( 1.InstituteofMicroelectronics,ChineseAcademyofSciences,Beijing, 100029,China; 2.KeyLaboratoryofMicroelectronicsDevicesandIntegratedTechnology,Beijing, 100029,China)