川西拗陷马井地区雷四~3亚段储层特征及成岩作用  

Reservoir characteristics and diagenesis of the Member 4-3 of Leikoupo Formation in Majing area,Sichuan,China

作　　者：郝哲敏 许国明[2] 陈洪德[3] 王琼仙[2] 宋晓波[2] 隆轲[2] HAO Zhemin;XU Guoming;CHEN Hongde;WANG Qiongxian;SONG Xiaobo;LONG Ke(Post-Doctoral Scientific Research Station,Southwest Oil&Gas Company,SINOPEC,Chengdu 610041,China;Research Institute of Exploration and Development,Southwest Oil&Gas Company,SINOPEC,Chengdu 610041,China;State Key Laboratory of Oil&Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Chengdu 610059,China)

机构地区：[1]中国石化西南油气分公司博士后科研工作站,成都610041 [2]中国石化西南油气分公司勘探开发研究院,成都610041 [3]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

出　　处：《成都理工大学学报（自然科学版）》2019年第5期586-596,共11页Journal of Chengdu University of Technology: Science & Technology Edition

基　　金：中国石化重大科技攻关项目(P16092)

摘　　要：针对川西拗陷马井地区获产工业气流的A1井,通过钻井岩心编录、薄片显微鉴定、物性分析、阴极发光、碳氧同位素、X射线衍射分析等方法,对中三叠统雷口坡组第四段第3亚段开展了储层特征、成岩作用和成岩演化序列的研究。马井地区雷四^3亚段可分为上、下两个储层段,上储层段主要储层岩石类型为颗粒晶粒云灰岩和晶粒云灰岩,下储层段主要储层岩石类型为晶粒颗粒白云岩、颗粒晶粒白云岩和晶粒白云岩;储集空间类型以晶间孔、晶间溶孔、粒间孔、粒内孔和裂缝为主;储层成岩作用具有多类型、多期次改造和叠加的特征,主要成岩作用有白云石化作用、溶蚀作用、破裂作用、胶结作用、压实压溶作用和去云化作用。根据成岩作用的先后顺序、矿物的相互切割关系,结合成岩环境演化特征,将马井地区雷四^3亚段储层划分为准同生期、浅埋藏期、表生期和中深埋藏期4个成岩期。The reservoir characteristics,diagenesis and diagenetic evolution sequences of the Member 4-3 of Middle Triassic Leikoupo Formation(T2 l^4-3)in industrial gas production Well A1 at Majing area of western Sichuan depression were studied by drilling core compilation,thin section identification,physical property analysis,cathode luminescence analysis,X-ray diffraction analysis,carbon and oxygen isotopes analysis.It shows that the T2 l^4-3 at Majing area can be further divided into the upper and the lower reservoirs.The rock types in the upper reservoir consist of granular crystalline dolomite limestone and crystalline dolomitic limestone,while the main reservoir rock types in the lower reservoir are composed of crystalline granular dolomite,granular crystalline dolomite and crystalline dolomite.Thin section observation and identification reveals that the major reservoir space in the reservoir rocks are intercrystalline pores,intercrystalline dissolution pores,intergranular pores,intragranular pores and fractures respectively.Reservoir diagenesis is characterized by multi-type and multi-stage reformation as well as by superposition,with the digenetic types of dolomitization,dissolution,fracture,cementation,mechanical-chemical compaction and dedolomitization.Based on the diagenetic sequences and mutual cutting relationship of minerals,in combination with the evolution character of diagenetic environment,the T2 l^4-3 at Majing area has been classified into 4 diagenetic stages,they are penecontemporaneous stage,shallow burial stage,supergene stage and middle-deep burial stage.

关 键 词：川西拗陷 雷口坡组 储层特征 成岩作用 成岩演化序列 

分 类 号：TE122.23[石油与天然气工程—油气勘探] P588.2[天文地球—岩石学]