摘要
通过岩心观察、薄片鉴定、扫描电镜、流体包裹体、阴极发光等分析测试技术,对开江—梁平海槽西侧长兴组生物礁滩储层特征、成岩作用开展研究。研究发现,开江—梁平海槽西侧长兴组储层以白云岩为主,残余粒间孔、溶孔发育。开江—梁平海槽西侧二叠系长兴组生物礁滩储层成岩阶段分为同生—准同生、早成岩、晚成岩三个阶段。白云岩储层经历了压实压溶、三期胶结、两期白云石化、两期溶蚀等成岩作用。同生—准同生期溶蚀作用是白云岩储层溶孔形成的主要成因,原生粒间孔是残余粒间孔的主要来源,早期白云石化作用利于已形成储集空间的保存,晚成岩期有机酸溶蚀进一步改善储集空间,但不是储层形成的主要原因。研究为海槽西侧生物礁滩储层的预测提供参考。
Through core observation,thin section identification,scanning electron microscopy,fluid inclusion analysis,cathodoluminescence,and other analytical testing techniques,this paper investigates the characteristics and diagenetic processes of the reef-shoal reservoir in the Changxing Formation on the western side of the Kaijiang—Liangping Trough.The study reveals that the reservoir in the Changxing Formation on the western side of the Kaijiang—Liangping Trough is primarily composed of dolomite,characterized by well-developed residual intergranular pores and dissolution pores.The diagenetic stages of the reef-shoal reservoir in the Changxing Formation on the western side of the Kaijiang—Liangping Trough can be divided into syngenetic—quasisyngenetic,early diagenetic,and late diagenetic stages.The dolomite reservoir has undergone compaction and pressure dissolution,including three stages of cementation,two stages of dolomitization,and two stages of dissolution.Dissolution during the syngenetic—quasisyngenetic stage is the main cause of the formation of dissolved pores in the dolomite reservoir;primary intergranular pores are the main source of residual intergranular pores;early dolomitization is beneficial for the preservation of the formed reservoir space;and organic acid dissolution during the late diagenetic stage further enhances the reservoir space,although it is not the main controlling factor for the formation of the reservoir.This study provides a reference for the prediction of reef-shood reservoir on the western side of Kaijinang—Liangping Through.
作者
罗妮娜
陈守春
刘菲
冯亮
叶朝阳
徐露
欧易
汪飒黎
LUO Nina;CHEN Shouchun;LIU Fei;Feng Liang;YE Zhaoyang;XU Lu;OU Yi;WANG Sali(Chongqing Gas Mine,PetroChina Southwest Oil&Gas field Company,Chongqing 400707,China)
出处
《复杂油气藏》
2025年第4期420-428,共9页
Complex Hydrocarbon Reservoirs
关键词
生物礁滩储层
成岩作用
孔隙演化
长兴组
开江—梁平海槽
reef-shoal reservoir
diagenesis
pore evolution
Changxing Formation
Kaijiang—Liangping Trough
