川东北通江-马路背地区须家河组断缝体储层特征及成因  

Characteristics and genesis of fault-fracture reservoirs in the Xujiahe Formation,Tongjiang-Malubei area,northeastern Sichuan Basin

作　　者：黄仁春[1] 刘若冰[1] 刘明[1] 曹环宇 宿赛 杜红权[1] Huang Renchun;Liu Ruobing;Liu Ming;Cao Huanyu;Su Sai;Du Hongquan(Research Institute of SINOPEC Exploration Company,Chengdu,Sichuan 610041,China)

机构地区：[1]中国石化勘探分公司勘探研究院,四川成都610041

出　　处：《石油与天然气地质》2021年第4期873-883,共11页Oil & Gas Geology

基　　金：国家科技重大专项(2016ZX05002,003,004)。

摘　　要：四川盆地东北部通江-马路背地区须家河组受多期构造运动叠加影响,构造变形强烈,发育多套规模砂体,须家河组发育特殊类型“断缝体”储层。运用钻井统计分析与区域构造演化相结合的方法,对该区储层特征、形成机理及发育控制因素进行研究。结果表明:这类储层是规模网状裂缝与相对高孔基质孔隙叠加形成规模网状缝孔储渗体,具有高孔、多缝、孔缝相关的特征。“断缝体”储层的形成与通江-马路背地区3层构造样式和多期构造活动关系密切,区域构造应力场与深部海相流体活动是“断缝体”储层形成的外部力学背景与内部成因机制。通源断裂具有通源与控储双重作用,高能水体环境下大规模发育的砂体为裂缝发育和溶蚀作用提供了基础,局部构造控制复杂缝网的形成,三者共同控制“断缝体”储层发育。Affected by the superposition of multi-phase tectonic movements,the Xujiahe Formation in Tongjiang-Malubei area of the northeastern Sichuan Basin contains many sets of large-scale sand layers and special fault-fracture reservoirs in highly deformed structures.A study of reservoir characteristics,formation mechanisms and development control factors,in combination with drilling data and regional tectonic evolution for the formation,shows that the reservoirs are highly porous with well-developed fractures and feature in close relation between matrix pores and pore-fracture networks.The formation of fault-fracture reservoirs is closely linked to the triple-layer tectonic pattern and multi-phase tectonic movements in the area.The regional tectonic stress field and deep fluid activities serve respectively as the external mechanical background and internal genetic mechanism for the development of reservoirs.With source rock-rooted faults having dual functions of connecting source rock with reservoir and controlling the development of reservoirs,large-scale sand layers providing the basis for fracturing and dissolution,and local structures controlling the formation of complex fracture networks,the fault-fracture reservoirs with hydrocarbon came into being in the formation.

关 键 词：断缝体 通源断裂 致密砂岩 须家河组 通江-马路背地区 四川盆地 

分 类 号：TE122.2[石油与天然气工程—油气勘探]