陈俊侠 薛艳

摘 要：桩西潜山具有较大的勘探潜力，以发育潜山内幕的裂缝型油藏为主。通过分析桩西潜山内幕储集层类型及特征，探讨了内幕型储层的成因机制，认为该内幕储层的形成主要与岩性、断裂构造、滑脱构造及其埋藏溶蚀的相互作用以及次级不整合面风化壳溶解有关。

关键词：济阳坳陷;桩西潜山;内幕型储层;滑脱构造

中图分类号：P618.13    文献标识码：A    文章编号：1003-5168（2021）21-0059-03

Characteristics and Genesis of Internal Type Reservoir of Zhuangxi Buried-hill， Jiyang Depression

CHEN Junxia1    XUE Yan2

（1. Henan Province General Institute of Coal Geology Exploration， Zhengzhou Henan 450000;

2. The First Geological Exploration Institute of Henan Provincial Bureau of Geo-exploration and Mineral Development， Zhengzhou Henan 450001）

Abstract： Buried hill in Zhuangxi has great exploration potential， which is given priority to fractured reservoir of internal buried hill. Through the analysis of types and characteristics of internal buried hill type reservoir in Zhuangxi， the formation mechanism of internal type reservoir is discussed. It is concluded that the formation of the internal type reservoir has relationship with lithology， fracture structure， detachment structure and its interaction with burial dissolution， as well as dissolve of weathering crust of the secondary unconformity surface.

Keywords： Jiyang depression; Zhuangxi Buried-hill; internal type reservoir; detachment structure

1 引言

桩西潜山位于山东省东营市河口区境内，地处济阳坳陷、渤中坳陷和埕宁隆起三大构造单元的交汇处，南北两侧分别以桩南断层和埕北断层为界与孤北洼陷和埕岛凸起相邻，东部紧邻郯庐断裂，与埕子口凸起和桩东洼陷相接，东西两侧分别是长堤断层和埕东断层，面积约154 km2。桩西潜山底部为太古界变质岩基底，其上古生界发育寒武系、奥陶系、石炭系、二叠系、缺失泥盆系和志留系。中生界缺失三叠系、发育侏罗系和白垩系。新生界包括古近系孔店组、沙河街组、东营组和新近系馆陶组、明化镇组。油气勘探表明，该区工业油流井主要与下古生界碳酸盐岩储层有关，储层的储集性能和实际产油、产气量主要受控于碳酸盐岩裂隙的发育程度[1]，内幕裂缝型储层在空间上的分布特征决定了油气勘探的方向[2]。

文章通过分析桩西潜山内幕储集层类型及特征，探讨了内幕型储层的成因机制，认为该内幕储层的形成主要与岩性、断裂构造、滑脱构造及其埋藏溶蚀的相互作用以及次级不整合面风化壳溶解有关，其中滑脱构造是产生内幕储层的主要外因，这一认识为该区油气勘探提供了新思路。……