低渗透储集层成岩作用与孔渗演化——以准噶尔盆地中部1区侏罗系三工河组为例  

Diagenesis and porosity-permeability evolution of low permeability reservoirs: A case study of Jurassic Sangonghe Formation in Block 1, central Junggar Basin, NW China

作　　者：葸克来[1,2] 操应长 王艳忠 Haile Beyene Girma 张响响 张江华[4] 金杰华 

机构地区：[1]中国石油大学地球科学与技术学院 [2]挪威奥斯陆大学地球科学学院 [3]中国石油勘探开发研究院 [4]中国石化胜利油田分公司新春采油厂

出　　处：《石油勘探与开发》2015年第4期434-443,共10页Petroleum Exploration and Development

基　　金：国家自然科学基金石油化工联合基金重点项目(U1262203);中央高校基本科研业务费专项资金项目(14CX06013A);国家留学基金项目(201406450019)

摘　　要：综合利用岩心观察、薄片鉴定、阴极发光分析、扫描电镜观察、流体包裹体分析、碳氧同位素组成分析、压汞分析及孔渗测试等技术方法,结合埋藏演化史、有机质热演化史和油气充注史,研究准噶尔盆地中部1区侏罗系三工河组低渗透储集层成岩作用与孔渗演化,并分析孔渗演化史与油气成藏史的匹配关系。该区低渗透储集层成岩环境经历了早期碱性、中期酸性和晚期碱性的演化过程,主要的胶结溶解序列为:绿泥石膜沉淀,早期方解石胶结,长石溶蚀、石英次生加大、自生高岭石充填,硬石膏胶结,晚期铁方解石胶结、晚期铁白云石胶结,少量黄铁矿胶结,其中压实作用贯穿于整个埋藏演化过程。孔渗演化史与成藏史匹配关系表明,三工河组存在3种成因类型的低渗透储集层:"先成藏后致密"型,勘探潜力最大;"边成藏边致密"型,勘探潜力中等;"先致密后成藏"型,勘探潜力较差。Based on core observation, thin section examination, cathode luminescence analysis, scanning electron microscopy, fluid inclusions, carbon and oxygen isotope, mercury penetration, porosity-permeability test and other analytical methods, combined with the histories of burial evolution, organic matter thermal evolution and hydrocarbon charge, the diagenesis and porosity-permeability evolution are studied of low-permeability reservoirs of Jurassic Sangonghe Formation in Block 1 of central Junggar Basin. The matching relation between reservoir porosity-permeability evolution and hydrocarbon accumulation history is analyzed. The diagenetic environment evolution of the reservoir in the study area is early alkaline, interim acid and late alkaline, forming the diagenetic sequence of chlorite membrane precipitation, early calcite cementation, feldspar dissolution accompanied by quartz overgrowth and authigenic kaolinite precipitation, anhydrite cementation, late period ferrocalcite and ankerite cementation, a small amount of pyrite cementation. Generally, compaction occurs throughout the whole burial process. According to the matching relation between reservoir porosity-permeability evolution and hydrocarbon accumulation history, the Jurassic Sangonghe Formation has three genetic types of low permeability reservoirs： densification after hydrocarbon accumulation, with the best exploration potential; densification during the hydrocarbon accumulation, with medium exploration potential; densification before the hydrocarbon accumulation, with the poorest exploration potential.

关 键 词：低渗透储集层 成岩作用 孔渗演化史 油气成藏史 准噶尔盆地 

分 类 号：TE122[石油与天然气工程—油气勘探]