摘要
涪陵页岩气田南部白马构造带自下古生界海相页岩生气以来,经历了多期构造运动,构造变形复杂且差异性强,这对页岩气藏含气量具有控制作用,使得成藏模式多样,限制了勘探开发进程。本文通过三维地震精细解释,结合系列岩心、钻测井资料,分析白马构造带构造特征与演化过程,在此基础上建立了页岩气富集成藏的三种模式。研究表明:(1)白马构造带主要发育北东向构造,表现出纵向分层与东西分带的差异变形特征。纵向上被寒武系覃家庙组膏盐层、志留系龙马溪组泥页岩层和三叠系嘉陵江组膏盐层三套滑脱层划分为上、中、下及前寒武系四套构造变形层。平面上自西向东可划分为断褶变形带与宽缓向斜带。(2)燕山晚期为构造变形活跃期,江南—雪峰造山作用产生自南东向北西的挤压,形成白马构造带主体北东向构造。喜山期为构造改造及定型期,印欧板块碰撞与青藏高原向东逃逸的远程效应引起四川盆地发生逆时针旋转,在川东地区表现为右旋剪切作用,发育走滑剪切带。白马构造带受到近东西向挤压,先存的北东向构造受到改造,向北逐渐转为近南北向。(3)白马构造带可划分为低压破碎背斜型、常压宽缓向斜型与常压平缓斜坡型三种页岩气富集成藏模式。其中,白马南斜坡页岩气富集保存条件较好,单井含气量高,白马向斜核部与东翼次之,单井含气量较高,北翼较差,单井含气量略低;石门—金坪背斜带不利于页岩气富集保存。
The Baima structure belt in the southern part of Fuling shale gas field has experienced many periods of structural movements since the Lower Paleozoic marine shale gasification,and the structural deformation is complicated and different,which has a controlling effect on the gas content of shale gas reservoirs,making the formation mode diverse and restricting the process of exploration and development.This paper analyzes the structural characteristics and evolution process of the Baima structure belt through 3D seismic interpretation,combined with a series of cores and drilling and logging data,and establishes three modes of shale gas enrichment and reservoir formation on the basis of these data.The study shows that:(1)the Baima structure belt mainly develops north-east oriented structures,and exhibits different deformation characteristics of vertical stratification and east-west stratification.Vertically,it is divided into four sets of upper,middle,lower,and Precambrian structural deformation layers by three sets of sliding layers,namely,the Cambrian Qinjiamiao Formation Salt Bed,the Silurian Longmaxi Formation Mud Shale Bed,and the Triassic Jialingjiang Formation Salt Bed.The plane from west to east can be divided into a fold deformation zone and a wide and slow oblique zone.(2)The late Yanshan period is an active period of structural deforma-tion,and the Jiangnan-Xuefeng orogeny produces extrusion from the south-east to the north-west,forming the main north-east oriented tectonic structure of the Baima structure belt.Himalayan period for the structural transformation and finalization of the period,the Indo-European plate collision and the Tibetan Plateau to the east to escape the remote effect caused by the Sichuan Basin counterclockwise rotation,in the eastern part of the Sichuan region for the performance of the right-handed shear,the development of slip shear zones.The Baima structure belt is extruded in the east-west direction,and the first existing northeast structure is modified,and then it gradually turn
作者
周杨帆
罗良
曾联波
刘超
刘世强
犹钰玲
莫娟
ZHOU Yangfan;LUO Liang;ZENG Lianbo;LIU Chao;LIU Shiqiang;YOU Yuling;MO Juan(State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum-Beijing,Beijing 102249,China;College of Geosciences,China University of Petroleum-Beijing,Beijing 102249,China;Research Institute of Exploration and Development,Jianghan Oilfield Company,SINOPEC,Qianjiang 433100,China)
出处
《石油科学通报》
CAS
2024年第2期183-195,共13页
Petroleum Science Bulletin
关键词
白马构造带
构造变形
页岩气
成藏模式
Baima structural belt
structural deformation
shale gas
accumulation model
