【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。更多还原

【Abstract】 The reservoir characteristics,diagenesis and diagenetic evolution sequences of the Member4-3 of Middle Triassic Leikoupo Formation(T2 l4-3)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 l4-3 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 multitype 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 l4-3 at Majing area has been classified into 4 diagenetic stages,they are penecontemporaneous stage,shallow burial stage,supergene stage and middle-deep burial stage.更多还原