基于构造样式的页岩气富集模式分类-以四川盆地五峰-龙马溪组为例  

Classification of shale gas enrichment patterns based on structural styles:a case study of the Wufeng Formation and Longmaxi Formation in Sichuan Basin,China

作　　者：拜文华[1,3] 徐思煌 刘昭茜[2] 梅廉夫[2] 程峰[1,3] BAI Wenhua;XU Sihuang;LIU Zhaoqian;MEI Lianfu;CHENG Feng(PetroChina Research Institute of Petroleum Exploration&Development,Beijing 100083,China;MOE Key Laboratory of Tectonics and Petroleum Resources,China University of Geosciences,Wuhan,Hubei 430074,China;National Energy Shale Gas Research and Development Center,Langfang 065007,China)

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]中国地质大学构造与油气资源教育部重点实验室,武汉430074 [3]国家能源页岩气研发(实验)中心,河北廊坊065007

出　　处：《华北地质》2024年第1期52-65,共14页North China Geology

基　　金：国家“十三五”重大专项“四川盆地及周缘页岩气形成富集条件、选区评价技术与应用”(2017ZX05035);中国石油天然气股份公司重大专项配套项目“页岩气示范区跟踪及外围重点目标评价”(XN11711)。

摘　　要：【研究目的】四川盆地及周缘五峰-龙马溪组页岩经历的构造活动复杂且改造作用强,构造改造程度与页岩气的聚集有着直接的影响,根据构造样式对页岩气富集模式进行划分具有重要意义。【研究方法】本文以构造分区及改造强度变化趋势为主线,整体研究四川盆地及周缘奥陶系上统五峰组-志留系下统龙马溪组页岩层系的构造分区、不同区块构造抬升时间差异,总结不同构造区的页岩气富集模式。【研究结果】通过研究不同地区五峰-龙马溪组页岩目的层系构造改造强度、构造形态、埋藏深度、埋藏抬升时间等的差异性,将四川盆地及周缘下古生界主力海相页岩层系划分为9个一级构造区和20个二级构造区。进一步研究了不同构造区典型井的构造埋藏史及生烃史,结合构造形态、保存条件及产气情况,将四川盆地及周缘划分为9种典型的页岩构造样式及页岩气富集模式:盆内大型斜坡型(威远型)、盆内低陡构造与宽缓向斜型(泸州型)、盆缘向斜型(长宁型)、盆缘复杂构造型(昭通型)、盆缘宽缓断背斜型(焦石坝型)、盆缘斜坡逆断层封堵型(丁山型)、盆外复杂背斜型(巫溪型)、盆外残留向斜型(彭水型)、盆外残留向斜逆断层封堵型(正安型),其页岩气富集及保存条件整体上依次变差。【结论】总结出的9种页岩气富集模式,概况了四川盆地内部到盆地外缘的整体构造演化及页岩气保存富集规律,可以为进一步的页岩气有利区优选提供范围和目标,更好地指导四川盆地及周缘的页岩气勘探。This paper is the result of shale gas.[Objective]The shale of Wufeng-Longmaxi formation in Sichuan Basin and its surrounding areas has experienced complex tectonic activities and strong reworking.The degree of reworking has a direct impact on the accumulation of shale gas,it is of great significance to classify shale gas enrichment models according to structural styles.[Methods]Mainly based on the structural zoning and the changing trend of reconstruction intensity,in this paper the structural division of Shale series of the Upper Ordovician Wufeng Formation-Lower Silurian Longmaxi Formation in Sichuan Basin and its surrounding areas,the difference of the time of tectonic uplift in different blocks,and the enrichment patterns of shale gas in different structural areas are summarized.[Results]By studying the differences in the intensity of structural transformation,structural morphology,burial depth and burial uplift time of Wufeng-longmaxi formation in different areas,the main marine shales of the lower Paleozoic in Sichuan Basin and its surrounding areas are divided into 9 first-class structural areas and 20 second-class structural areas.The structural burial history and hydrocarbon generation history of typical wells in different structural areas are further studied.There are 9 structural styles and enrichment patterns of shale gas in and around the Sichuan Basin:large slope type(Type Weiyuan),low-steep and broad-gentle syncline type(Type Luzhou),basin-marginal syncline type(Type Changning),basin-margin complex structure type(Type Zhaotong),basinmargin broad gentle fault anticline type(Type Jiaoshiba),basin-margin slope reverse fault sealing type(Type Dingshan),basinoutside complex anticline type(Type Wuxi),residual syncline type(Type Pengshui),the residual synclinal reverse fault outside the basin is sealing type(Type Zhengan).The enrichment and preservation conditions of shale gas are getting worse and worse.[Concluslions]The nine shale gas enrichment models,which provide an overview of the overall tectonic e

关 键 词：四川盆地及周缘 五峰-龙马溪组 页岩构造改造 构造样式 页岩气富集模式 

分 类 号：P618.13[天文地球—矿床学]