摘要
为明确四川盆地中西部走滑断裂与油气成藏的关系,基于三维地震断裂解释,缝洞充填物定年和已发现气藏解剖,揭示了走滑断裂特征、主要活动时期和对油气成藏的控制作用.走滑断裂主要见于震旦系-古生界地层,可划为3个断裂构造变形层;平面上主要分布于川中古隆起及斜坡区,以近EW和NWW⁃SEE向为主,存在6条近EW向走滑断裂带和两条NW⁃SE向逆冲断裂带,加里东期-海西早期、海西晚期-印支期和燕山中期-喜山期是走滑断裂主要活动时期.走滑断裂沟通了多套源储组合,对盆地中西部海相多层系立体成藏控制作用明显,已发现油气田和高产井主要分布在走滑断裂带;建立了走滑断裂4种差异化立体成藏模式,指出7个有利勘探区带,可为勘探部署提供理论认识依据.
In order to clarify the relationship between strike-slip faults and hydrocarbon accumulation of marine strata in the central and western Sichuan basin,based on a large area of 3D seismic data,fine interpretation of faults,isotopic dating of various filling minerals in fractures and caves,comprehensive analyses of discovered typical gas reservoirs,the development and distribution characteristics of the strike-slip faults,the main active period and the control effect on marine oil and gas accumulation are revealed,the natural gas accumulation models of the strike-slip fault zone is established,and the favorable exploration areas are pointed out.The strike-slip faults in the central and western Sichuan basin are characterized by layering and zoning development.The strata develop mainly in the Sinian-Paleozoic strata,and can be divided into three fault developed structural deformation layers;It is mainly distributed in the paleo uplift and anticline area in the middle of Sichuan,mainly in the near east-west fault,with good inheritance from deep to shallow fault;Ziyang Gaoshiti,Jianyang Moxi,Moxibei,Zhongjiang Shehong,Yanting Yingshan and Langzhong are identified as six near east-west main strike-slip fault zones.The dating results of the filling materials in the fractures and caves show that there are mainly three stages of strike-slip faults and fluid activities in Caledonian-Early Hercynian,Late Hercynian-Indosinian and middle Yanshanian-Himalayan.The effects of fault activities on oil and gas accumulation in different periods are different.The strike-slip fault connects multiple sets of source reservoir combinations of Sinian-Paleozoic,and has a significant control effect on the migration and accumulation of marine oil and gas and the threedimensional reservoir formation of multi-layer system.It has been found that oil and gas fields and high-yield wells are mainly distributed near the strike-slip fault.Four differential three-dimensional reservoir forming models of strike-slip fracture zone are established,and seven favorable exploration areas are pointed out,which can provide basis for exploration deployment.
作者
付小东
张本健
汪泽成
雷明
张建勇
管树巍
李文正
钟原
谷明峰
陈涛
Fu Xiaodong;Zhang Benjian;Wang Zecheng;Lei Ming;Zhang Jianyong;Guan Shuwei;Li Wenzheng;Zhong Yuan;Gu Mingfeng;Chen Tao(PetroChina Hangzhou Research Institute of Geology,Hangzhou 310023,China;PetroChina Southwest Oil Gas Field Company,Chengdu 610051,China;Petroleum Exploration and Development Research Institute,PetroChina,Beijing 100083,China;PetroChina Research Institute of Petroleum Exploration&Development-Northwest,Lanzhou 730020,China)
出处
《地球科学》
EI
CAS
CSCD
北大核心
2023年第6期2221-2237,共17页
Earth Science
基金
“十三•五”国家油气专项(No.2017ZX05008005)
中国石油天然气股份有限公司重点科技项目(No.2018A⁃0105)
基础性与前瞻性项目(No.2021DJ1503).
关键词
四川盆地中西部
海相层系
走滑断裂
立体成藏模式
石油地质.
central and western Sichuan basin
marine strata
strike-slip fault
stereoscopic accumulation model
petroleum geology.
