论文部分内容阅读
四川盆地东部上石炭统黄龙组是天然气藏的主力产层.在岩心观察、野外剖面实测和室内薄片鉴定分析的基础上,结合钻井、测井、物性分析和X-衍射分析资料,对川东黄龙组碳酸盐岩储层沉积-成岩系统进行了深入研究.认为川东黄龙组主要发育萨勃哈、有障壁海岸和陆棚3个相带以及特殊的古喀斯特相,储集岩类型以白云质岩溶角砾岩及颗粒白云岩为主,有效的储集空间类型主要为晶间孔、晶间溶孔,最重要的储层类型为孔洞缝型,最有利储层发育部位为岩溶上斜坡中的坡地和残丘微地貌单元.综合分析认为,沉积-成岩系统与储层在时空上具有良好的耦合关系,粒屑滩沉积微相控制了黄龙组储层的区域分布,早-中成岩阶段压实卤水成岩系统、古表生期大气水成岩系统以及埋藏成岩阶段的温压水成岩系统对优质储层发育贡献最大.
The Upper Carboniferous Huanglong Formation in eastern Sichuan Basin is the main production layer of natural gas reservoirs. Based on the core observation, the field profile measurement and the identification and analysis of the in-house thin slices, combining with drilling, well logging, physical property analysis and X-ray diffraction analysis, Huanglong Formation carbonate reservoir sedimentary-diagenetic system was studied in depth.It is believed that the East Sichuan Huanglong Formation is mainly composed of Saibha, barrier coast and shelf three facies belts and special paleokarst facies, Dolomitic karst breccias and dolomitic dolomites are the main types of reservoirs. The main types of reservoirs are intergranular pores and intergranular dissolved pores. The most important reservoir type is the pore type, and the most favorable reservoirs are karst Slope and sloping micro-topography unit.A comprehensive analysis shows that the sedimentary-diagenetic system has a good coupling relationship with the reservoir in time and space, and the granulite sedimentary microfacies controls the regional distribution of the Huanglong Formation reservoir, Diagenetic compaction brine diagenetic system, paleocontinental gas hydrophyroid system and burial diagenetic stage are the most important contributions to the development of high-quality reservoirs.