摘要
针对四川盆地中二叠统栖霞组岩溶成因及古地貌分布特征认识不清的问题,开展了岩溶储层地质响应分析。研究发现,四川盆地栖霞组层间岩溶储层是由于三级层序界面暴露溶蚀及高位体系域的高频层序界面短暂暴露形成。结合栖霞组厚度、古地理环境及水动力特征分析,将四川盆地栖霞组顶部划分为3类地貌单元,即川西中缓坡生屑滩、川东北台内滩和川南泸州古隆起。川西中缓坡生屑滩和川东北台内滩所形成的沉积微地貌高地和川南泸州古隆起及其斜坡区是栖霞组层间岩溶储层发育的优势地带。根据这一认识并结合烃源岩生烃强度特征将栖霞组岩溶储层划分为4个有利勘探区带。
In view of the incomplete understanding on the karst origin and distribution characteristics of paleo-landform of the Middle Permian Qixia Formation in the Sichuan Basin, we studied geological responses of its karst reservoirs thoroughly. The research indi- cated that Qixia interlayer karsts were formed due to the exposure and erosion of third-grade sequence boundaries and the transient exposure of high-frequency sequence interfaces of the highstand systems tract. Based on the isopach map, paleogeographic environ- ment and hydrodynamic forces of the Qixia Formation, its top paleo-landform was divided into three second grade geomorphic units, i.e. the middle ramp facies belt in western Sichuan, the inne^platform shoal facies belt in northeastern Sichuan and the Luzhou pa- leo-uplift in southern Sichuan. The sedimentary microtopographic high formed both in bioclastic beaches of the middle ramp of west- ern $ichuan and in inner-platform shoals of northeastern Sichuan, along with the paleo-uplift and its slopes of southern Sichuan, is favorable for the development of karst reservoirs in the Qixia Formation. On the basis of this new understanding and characteristics of the hydrocarbon generating intensity of source rocks, four favorable zones were proposed for the exploration of karst reservoirs in the Oixia Formation.
出处
《石油学报》
EI
CAS
CSCD
北大核心
2013年第5期833-842,共10页
Acta Petrolei Sinica
基金
国家重大科技专项"海相碳酸盐岩油气资源潜力与大油气田形成条件
分布规律研究"(2011ZX05004-001)资助
关键词
四川盆地
栖霞组
层间岩溶
古地貌
储层
Sichuan Basin Qixia Formation interlayer karst paleo-landform reservoir
作者简介
王海真，女，1986年6月生，2010年获东北石油大学学士学位，现为中国石油勘探开发研究院硕士研究生，主要从事碳酸盐岩沉积储层研究。Email：wanghzl267@gmail．com
