常压页岩气藏成因分析与有效开发——以四川盆地东南缘地区五峰组—龙马溪组页岩气藏为例  

Genesis analysis and effective development of normal pressure shale gas reservoir:A case of Wufeng-Longmaxi shale gas reservoir in southeast margin of Sichuan Basin

作　　者：薛冈 熊炜[1] 张培先[1] XUE Gang;XIONG Wei;ZHANG Peixian(Sinopec East China Oil&Gas Company,Nanjing,Jiangsu 210019,China)

机构地区：[1]中国石化华东油气分公司,江苏南京210019

出　　处：《油气藏评价与开发》2023年第5期668-675,共8页Petroleum Reservoir Evaluation and Development

基　　金：国家科技重大专项“彭水地区常压页岩气勘探开发示范工程”(2016ZX05061);中国石化科技部项目“南川—武隆地区常压页岩气富集高产机理与目标评价”(P21087-6)。

摘　　要：四川盆地东南缘(简称川东南)地区五峰组—龙马溪组发育以武隆残留向斜型常压页岩气藏和涪陵背斜型高压页岩气藏为代表的2种页岩气藏类型。基于地质工程一体化思路,利用页岩埋藏史、钻井及水平井压裂参数等资料,根据常压页岩气地质特点,开展常压页岩气藏成因分析及形成机理研究,结合2口页岩气水平井的实际生产效果,优化了常压页岩气藏压裂工艺参数,并得出结论:(1)川东南地区五峰组—龙马溪组常压页岩气藏主要经过燕山期和喜山期两期构造作用破坏调整形成;(2)构造抬升导致的页岩气逸散是形成常压页岩气的主要原因;(3)武隆常压页岩气藏与Marcellus(马塞勒斯)常压页岩气藏地质特点相似,但开发效果差异较大,压裂规模模拟表明武隆常压页岩气藏需进一步优化水平井分段压裂参数、提高单井产量、降低开发成本,有望实现有效开发。There are two types of shale gas reservoirs in the Wufeng-Longmaxi shale formation of southeast margin of Sichuan Basin:normal pressure shale gas reservoir in Wulong residual syncline and abnormal over-pressure shale gas reservoir in Fuling anticline.This study takes an integrated geology-engineering approach to analyze the genesis and formation mechanisms of normal pressure shale gas reservoirs in the Wulong area.The analysis is based on shale burial history curves,drilling data,horizontal well fracturing parameters,and the geological characteristics specific to normal pressure shale gas reservoirs.Combined with the actual production effects of two horizontal shale gas wells,the fracturing process parameters of normal pressure shale gas reservoirs are optimised.Then three main points have been obtained in this study:①The normal pressure shale gas reservoir of the Wufeng-Longmaxi Formation in Wulong area is formed during the structural destruction adjustment of the Yanshanian and Himalayan tectonic periods.②The shale gas escaping caused by tectonic elevation is the main reason for the formation of normal pressure shale gas.③Compared with the Marcellus normal pressure shale gas reservoir,Wulong normal pressure shale gas reservoir has the similar geological characteristics,but the development effect varies greatly.The fracturing scale simulation shows that it is necessary to further optimise the horizontal well segmented fracturing parameters,increase the output of single wells,and reduce development costs.Only in this way can effective development be realised.

关 键 词：常压页岩气 有效开发 五峰组—龙马溪组 四川盆地东南缘 

分 类 号：TE37[石油与天然气工程—油气田开发工程]