川西拗陷新场气田须家河组宽大裂缝及其油气地质意义  

Study of Xujiahe Formation macro-fractures in Xinchang Gas Field in Western Sichuan Depression and their oil&gas geological significance

作　　者：姜自然 陆正元 刘斐 乔林 JIANG Ziran;LU Zhengyuan;LIU Fei;QIAO Lin(State Key Laboratory of Oil and Gas Geology and Exploitation,Chengdu University of Technology,Chengdu 610059,China;Exploration and Development Research Institute,PetroChina Southwest Oil&Gasfield Company,Chengdu 610041,China;The First Gas Production Plant,Sinopec Southwest Oil and Gas Company,Deyang 618000,China)

机构地区：[1]油气藏地质及开发工程国家重点实验室(成都理工大学),成都610059 [2]中国石油西南油气田分公司、勘探开发研究院,成都610041 [3]中国石化西南油气分公司采气一厂,四川德阳618000

出　　处：《成都理工大学学报（自然科学版）》2023年第1期34-42,共9页Journal of Chengdu University of Technology: Science & Technology Edition

基　　金：国家自然科学基金项目(41674112)。

摘　　要：综合利用录井地质、开发动态资料探讨川西拗陷新场气田上三叠统须家河组致密砂岩中发育的宽大裂缝及其对气藏物性和气井开发动态特征的影响。新场气田须家河组岩心发育开度约10 mm的宽大裂缝,其产状直立、贯穿岩心长度达4 m多,宽大裂缝开度明显大于砂岩中常见开度为1 mm左右的微细裂缝。产层段岩屑录井见大量数毫米的粒状次生矿物以及钻进过程中发生数十立方米或更多的钻井液漏失,揭示了产层段中宽大裂缝的普遍发育。须家河组宽大裂缝为天然气提供了重要的储集空间和流动通道,控制了致密砂岩中有利储集区块的发育。宽大裂缝发育区块气井开发动态表现为高产稳产或低产稳产,明显有别于致密砂岩气初期产量较高但不能稳产的特征。Based on the logging geology and development dynamic data,the wide-open macro-fractures developed in tight sandstone of Upper Triassic Xujiahe Formation in Xinchang Gas Field of Western Sichuan Depression and their influence on gas reservoir physical properties and gas well development dynamic characteristics are discussed.The core of Xujiahe Formation in Xinchang Gas Field has a wide-open macro-fracture with an opening width of about 10 mm and with more than 4 m in length through the drilled core.The wide-open macro-fracture is significantly larger than the micro-fracture in sandstone,which has a common opening width of about 1 mm.The fact that a large number of granular secondary minerals of several millimeters and the loss of tens of cubic meters or more of drilling fluid during drilling revealed the widespread development of wide-open fractures in the production interval.The wide-open macro-fractures in Xujiahe Formation provide important reservoir space and gas flow channel for natural gas and control the development of favorable reservoir blocks in tight sandstone.The gas well development dynamic performance in the wide-open fractured block is either high and stable production or low and stable production,which is obviously different from the characteristics of tight sandstone gas with high initial production but unstable production.

关 键 词：宽大裂缝 致密砂岩 天然气开发 四川盆地 

分 类 号：TE122.23[石油与天然气工程—油气勘探]