徐　翰，陈　杰，汪新文中国地质大学（北京）地球科学与资源学院，北京100083



张东断层下降盘沙河街组精细测井微相研究

徐翰，陈杰，汪新文
中国地质大学（北京）地球科学与资源学院，北京100083

摘要：横穿张东地区的张东断层严重影响断层上、下盘的沉积、构造演化，因此有必要对张东断层下降盘地层的沉积特征进行专门研究，建立下降盘沉积演化机制。本文依据粒度、岩性、沉积构造等沉积学特征，综合测井资料对张东断层下降盘的沙河街组沙三段、沙二段进行精细测井微相研究。结果表明：沙三段沉积物主要来源于构造高位的埕宁隆起西南部，发育半深湖扇三角洲前缘亚相，分为河口坝、水下分流河道、席状砂和支流间湾等4种微相，前扇三角洲亚相在某些阶段也有发育；沙二段物源仍为埕宁隆起西南部，属浅、滨湖沉积环境下的三角洲前缘亚相，分为水下分流河道、河口坝、前缘席状砂等3种微相。通过分析沙三段、沙二段的沉积相平面展布，认定张东断层作为物源通道，对进入下降盘的沉积物有明显控制作用。

关键词：张东断层；测井；沉积微相

Study on the Fine Logging Microfacies in Shahejie Formation of Zhangdong Fault Footwall

XU Han，CHEN Jie，WANG Xin-wen
School of Earth Sciences and Recourses/China University of Geosciences, Beijing 100083, China

Abstracts: Zhangdong fault across Zhangdong district influences on the sedimentary and structural evolution of fault’s hanging wall and footwall significantly，so it is necessary to conduct a specific research on the sedimentary characteristics of Zhangodng fault footwall to set up a sedimentary evolution model. Based on sedimentological characteristics such as particle size，lithology and sedimentary structures combined with comprehensive analysis of well logs，this paper conducted the research on fine logging microfacies in Shasan and Shaer section. We figured out that Shasan section’s provenance came from a relatively structural pinpoint which located in southwest named Chengning high. Shasan section mainly developed semi-deep lake fan delta front face，which could be further divided into subaqueous distributary channel，channel mouth bar，sheet sand and interdistributary bay；fan prodelta also developed somewhere in Shasan section. Shaer section’s provenance was from southwest Chengning high and belonged to shallow lacustrine delta front which could be further divided into subaqueous distributary channel，channelmouth bar，frontal sheet sand. By analyzing the deposition plane distribution of Shasan and shaer section，Zhangdong fault had been identified as the provenance channel which played a significant role in controlling sediment to enter the fault footwall.

Keywords:Zhangdong fault；logging；sedimentary microfacies

1　概况

张东开发区位于大港油田滩海地区以东海拔-2～0 m的极浅海区域，行政区划上属于河北黄骅南排河镇张巨河村。1993年第一次在张东断层上升盘附近钻井试油成功后，证实了区域含油气性[1]。为了配合油气勘探开发，前人对张东开发区的油气地质特征进行了一系列的评价。张东断层上升盘主要划分为沙三段、沙二段和沙一段三个小层[2]；……