摘要
乍得南部地区B盆地下白垩统碎屑岩储集层的成岩作用主要处在早成岩阶段B期至晚成岩阶段B期,机械压实作用、压溶作用、胶结作用和溶解作用对其物性影响强烈;颗粒骨架的淋滤、早期及后期碳酸盐胶结物、骨架颗粒(长石、火山岩碎屑)和黏土胶结物的溶解是盆地形成优质储集层的主要因素;成岩相可划分为颗粒铸模相、溶解相和石英次生加大相。下白垩统碎屑岩储集层成岩作用特征及其演化的影响因素主要包括:储集层结构成熟度、成分成熟度,构造环境,油气充注时间。
The diagenesis of the clastic reservoir in Lower Cretaceous of B Basin in South Chad, Central Africa, can mainly be ascribed to the B substage of the early diagenetic stage to the B substage of the late diagenetic stage. The mechanical compaction, pressure solution, cementation and dissolution have strong influences on the reservoir qualities. The key to the good quality reservoir is leached grains and the dissolutions of the early and late carbonate cements, framework grains （feldspar, volcanic fragments） and clay cements. Diagenesis facies in Lower Cretaceous of B Basin can be divided into three sets, namely grains moldic, dissolution and extensive quartz overgrowth facies. The dominant factors of diagenesis and evolution of the clastic reservoirs in Lower Cretaceous are textural and compositional maturities, tectonic environment and the infilling time of hydrocarbon.
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
2006年第2期250-254,共5页
Petroleum Exploration and Development
基金
中国石油天然气集团公司2004年研究课题"海外油气田勘探与开发技术研究"(04B60204)
