摘要
对储层超压的分析,有助于理解渤中坳陷油气晚期快速成藏机理.利用RFT实测储层压力资料分析了渤中坳陷储层超压的特征和成因.渤中坳陷存在3套储层超压系统:浅层明化镇组-馆陶组储层超压系统、中层东营组-沙河街组-孔店组储层超压系统、基底(中生界及以下地层)储层超压系统.渤中坳陷的储层超压可能主要是由3种机制综合引起的,即不均衡压实作用、超压传递作用和裂解气的生成作用.少量保存的传递超压是深部超压流体注入的'化石',它是超压背景下油气快速充注成藏的结果.
The analysis of fluid migration and rapid hydrocarbon accumulation is essential for exploring distribution of overpressure and probing into its generaion. Based on the RFT of many drills in Bozhong depression, the characteristics and generation of reservoir overpressure have been discussed in this paper. Three reservoir overpressure systems have been identified in the Bozhong depression： an upper reservoir overpressure in Guantao Formation-Minghuazhen Formation, a middle reservoir overpressure in Dongying Formation-Shahejie Formation-Kongdian Formation, and a lower reservoir overpressure in base （Pre-Cenozoic）. Detailed investigation of reservoir overpressure in the Bozhong depression shows that overpressure probably is the result of a combination of following three mechanisms： mechanical compaction disequilibrium, overpressure transference and thermal cracking. Transfer overpressure maybe is common in subsurface reservoirs, but recognizable transfer overpressures are infrequent. A few transfer overpressures preserved in reservoirs at shallower depths named ＂overpressure fluid fossil＂, resulted from deeper overpressured fluid charging, helps us to understand the rapid petroleum accumulation in overpressured sedimentary basins.
出处
《地球科学（中国地质大学学报）》
EI
CAS
CSCD
北大核心
2008年第3期337-341,共5页
Earth Science-Journal of China University of Geosciences
基金
国家自然科学重点基金项目(No.40238059)
国家自然科学基金青年科学基金项目(No.40402014)
关键词
储层超压
传递超压
裂解气
快速成藏
渤中坳陷
reservoir overpressure
transfer overpressure
thermal cracking
rapid petroleum accumulation
Bozhong depression.
