Distribution pattern of deltaic sand bodies controlled by syn-depositional faults in a rift lacustrine basin  

作　　者：DOU Luxing HOU Jiagen ZHANG Li LIU Yuming WANG Xixin WANG Jian WU Gang 

机构地区：[1]State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing),Beijing 102249,China [2]College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China [3]College of Geosciences,Yangtze University,Wuhan 430100,China [4]Exploration and Development Research Institute,Shengli Oilfield Company,SINOPEC,Dongying 257015,China

出　　处：《Petroleum Exploration and Development》2020年第3期572-584,共13页石油勘探与开发（英文版）

基　　金：Supported by the China National Science and Technology Major Project(2016ZX05011-002,2016ZX05010-001,2016ZX05011-001);the National Basic Research Program(973)Program(2015CB250901);the National Natural Science Foundation of China(41902122)

摘　　要：Take the lacustrine delta in the second member of Paleogene Shahejie Formation in block Wang43, Dongying depression, Bohai Bay Basin as an example, the deposition architectural characteristics of lacustrine deltaic sand bodies controlled by syn-depositional faults in complex fault blocks of rift basin are examined from the aspect of the tectonic-deposition response, using cores, well logs and three-dimensional seismic data. The small-scale syn-depositional faults in complex fault blocks are dense and different in dip, the activity along the strike of syn-depositional fault varies in different positions, and all these control the sedimentary process of deltaic sand bodies. Influenced by syn-depositional faults, the deltaic distributary channel is more likely to pass through the position with weak fault activity, and be deflected or limited at the position with strong fault activity. In downthrown side of a single syn-depositional fault or micro-graben areas, sand bodies increase in thickness and planar scale, and sand bodies of multiple stages are likely to stack over each other vertically. In micro-horst areas controlled by syn-depositional faults, the sand bodies decrease in abundance, and appear in intermittent superimposed pattern vertically. This study can provide new research ideas and theoretical basis for exploration and development research in complex fault blocks.

关 键 词：Bohai Bay Basin Dongying depression PALEOGENE Shahejie Formation complex fault block small-scale fault syn-depositional fault delta 

分 类 号：TE311[石油与天然气工程—油气田开发工程]