“双源”控制的窄河道致密砂岩气富集高产模式——以四川盆地金秋气田中侏罗统沙溪庙组为例  

Accumulation and high-yield model of narrow channel tight sandstone gas controlled by"double-sources":A case study of Middle Jurassic Shaximiao Formation of Jinqiu gas field in the Sichuan Basin

作　　者：张小菊 邓虎成[2,3] 徐争启[1] 朱德宇 段博瀚 王小娟 伏美燕[2,3] 李傥 凌灿 马自立 雍洋 ZHANG Xiaoju;DENG Hucheng;XU Zhengqi;ZHU Deyu;DUAN Bohan;WANG Xiaojuan;FU Meiyan;LI Tang;LING Can;MA Zili;YONG Yang(College of Earth Sciences,Chengdu University of Technology,Chengdu,Sichuan 610059,China;College of Energy,Chengdu University of Technology,Chengdu,Sichuan 610059,China;State Key Laboratory of Oil&Gas Reservoir Geology and Exploitation//Chengdu University of Technology,Chengdu,Sichuan 610059,China;Exploration and Development Research Institute,PetroChina Southwest Oil&Gasfield Company,Chengdu,Sichuan 610041,China)

机构地区：[1]成都理工大学地球科学学院 [2]成都理工大学能源学院 [3]油气藏地质及开发工程全国重点实验室·成都理工大学 [4]中国石油西南油田公司勘探开发研究院

出　　处：《天然气工业》2023年第10期34-46,共13页Natural Gas Industry

基　　金：中国石油西南油气田公司科研项目“金秋气田金华区块开发地质评价及有利区优选研究”(编号:XNS勘研院JS2021-099);“金秋气田沙溪庙组高产井模式及主控因素研究”(编号:XNS致密JS2021-170)。

摘　　要：四川盆地中部金秋气田中侏罗统沙溪庙组致密砂岩气资源潜力大,但该区致密砂岩气高效勘探开发面临着诸多技术难题,亟须开展致密砂岩气富集高产主控因素及模式研究,进而明确该区天然气富集高产规律,为有利区优选和高产井部署提供理论依据。为此,以金秋气田沙溪庙组二段一亚段(以下简称沙二1亚段)窄河道砂岩为研究对象,利用钻井岩心、测井、地震及生产动态资料等,厘清了天然气分布特征,明确了天然气富集高产主控因素,构建了“双源”控制的窄河道致密砂岩气藏富集高产模式。研究结果表明:①不同砂组不同河道段含气性差异大,高产井主要分布于6号砂组JQ5H井区东北部、ZQ1井区东南部,8号砂组QL16井区中南部及东部、JQ8井区中西部、JQ5H井区西北部,9号砂组ZQ1井区东南部。②沙二1亚段天然气富集高产受控于优越的烃源岩条件、优质储层的发育程度和高效输导体系。③在优越的烃源岩条件下,砂体连通性好且发育有利的断—砂“V”字形组合砂体的天然气充注动力强、充注阻力小,天然气充注程度较高,易形成天然气富集高产区。④东部的JQ5H井区和ZQ1井区,与角1号断裂“V”字形对接的连通砂体内Ⅰ、Ⅱ类储层占比高的河道段为天然气富集区;以须家河组为主要气源的西部QL16井区和JQ8井区,高产井分布在西南部河道砂体连通性最好的8号砂组,自西南向东北压力损失小且持续保持好,为天然气富集区。结论认为,“双源”控制的窄河道致密砂岩气藏富集高产模式揭示了四川盆地金秋气田沙溪庙组致密砂岩气富集高产规律,支撑了该区致密砂岩气高效勘探开发,并为相似地质条件下的气田的勘探开发提供参考。There is a large potential of tight gas resources in the Middle Jurassic Shaximiao Formation of the Jinqiu gas field in the central part of the Sichuan Basin,but the efficient exploration and development of tight gas in this area still faces many technical difficulties,so it is urgent to research the main controlling factors and model of natural gas accumulation and high yield of tight sandstone gas,and to clarify the rules of natural gas accumulation and high yield in this area,so that it will provide theoretical basis for the selection of favorable zones and the deployment of high-yield wells.This study mainly focuses on the narrow channel sandstone of the first sub-member of the second member of Shaximiao Formation(Sha 21)of Middle Jurassic in the Jinqiu gas field,central Sichuan Basin.By applying the drilling cores,well logging,seismic,and production performance data,the characteristics of the natural gas distribution are clarified and the main controlling factors of the natural gas accumulation and high yield are determined,so as to construct an accumulation and high-yield model of narrow channel tight sandstone gas reservoir controlled by the"double-sources".The results show that the gas content of different channel sections from different sand groups varies greatly.The major high-yield wells are distributed in the northeastern part of JQ5H well area and the southeastern part of ZQ1 well area of sand group No.6,the south–central and eastern part of QL16 well area,the central-western part of JQ8 well area,the northwestern part of JQ5H well area,and the southeastern part of ZQ1 well area of sand group No.9.The natural gas accumulation and high yield of Sha 21 are controlled by the excellent source rock conditions,the development degree of high-quality reservoirs,and efficient transport system.Under superior source rock conditions,the well-developed sandbodies of V-shaped fault-sandstone combination with good connectivity have stronger natural gas charging power,less resistance to natural gas charging and hi

关 键 词：四川盆地 金秋气田 中侏罗统 沙溪庙组 致密砂岩气藏 富集高产主控因素 高产模式 

分 类 号：P618.13[天文地球—矿床学]