【作者】 梁爽； 金树堂； 郑俊章； 王燕琨； 尹继全； 邓志展； 王震；

【Author】 Liang Shuang;Jin Shutang;Zheng Junzhang;Wang Yankun;Yin Jiquan;Deng Zhizhan;Wang Zhen;PetroChina Research Institute of Petroleum Exploration and Development;Aktyubin Oil/Gas Ltd,CNPC;

【机构】 中国石油勘探开发研究院； 阿克纠宾油气股份公司；

【摘要】 滨里海盆地东-南部盐下碳酸盐岩是主要勘探目的层,储层是该区成藏最重要的控制因素。通过储层岩石学和地球化学研究,建立了滨里海盆地东-南部碳酸盐岩优质储层成因模式。溶蚀作用是优质储层形成的关键因素,整体而言,盆地东-南部不同区域碳酸盐岩优质储层的形成机制存在明显差异:1)盆地东部发育多个宽缓碳酸盐岩台地,以台内滩相灰岩和蒸发台地相白云岩为主,优质储层受白云岩化作用及层序界面下埋藏溶蚀作用控制,乌拉尔多期造山运动形成局部不同尺度的裂缝;2)盆地东南部发育狭窄浅海台地相各类灰岩储层以次生裂隙、溶孔溶洞发育为特征,主要受不整合面附近表生溶蚀作用及构造作用控制;3)盆地南部为大型孤立礁台,储层主要受表生溶蚀作用改造及硫酸盐热化学还原反应(TSR)控制。更多还原

【Abstract】 Subsalt carbonate reservoir,the most important control factor for hydrocarbon accumulation,was the main exploration target in the southeastern of Precaspian basin.Based on reservoir petrology and geochemistry research,it established genetic model for high quality carbonate reservoirs in the southeastern of Precaspian basin.It shows that selective dissolution was the key element for high-quality reservoir.The formation mechanism is significant different for various area:1)for the eastern part of the basin,it developed multiple relief carbonate platforms where the lithology was limestone and dolomite.Dolomitization and burial dissolution dominated the high-quality reservoirs development.2) Shallow sea platform,characterized by secondary cracks and dissolved pores,developed limestone reservoirs in southeast of basin.The development of reservoir was controlled by supergene dissolution and tectonic near the unconformity.3) In the southern part of basin,it was characterized by isolated reef and reservoir was controlled by supergene dissolution and thermochemical sulfate reaction(TSR).更多还原