南海成藏组合发育特征及勘探潜力评价

CHARACTERISTICS OF PETROLEUM ACCUMULATIONS IN THE SOUTH CHINA SEA AND THEIR EXPLORATION POTENTIAL

在南海区域地质综合研究基础上,通过对南海海域已发现油气藏系统分析,并对典型油气藏解剖,按照生、运、聚、保等特点,从纵向上将南海海域盆地划分出基岩、下部、中部、上部4套成藏组合,并剖析了各成藏组合内油气有利聚集带与油气成藏主控因素。最后指出南海北部以中下成藏组合为主、南部以中上成藏组合为主、上部成藏组合是南海深水区最重要的成藏组合。

Influenced by the specific geopolitical position and the complicated engineering geological background,oil exploration in the deepwater basins of the SCS is much delayed.It has led to a lack of understanding of hydrocarbon accumulation conditions,favorable enrichment areas and main controlling factors.Through system analysis and case studies of some typical fields,based on the regional geological background,and the patterns of ＂source rocks,migration,accumulation and preservation＂,this paper reveals four petroleum plays,including the Pre-Tertiary basement play,lower play,middle play and upper play.At the same time,the hydrocarbon favorable accumulation zones and the main controlling factors of each play are described and discussed.From the study,the following conclusions are reached.First,the middle and lower plays are the main ones for the northern part of SCS.Second,the middle and upper plays are the main ones for the southern part of SCS.Third,the upper play is the most important one for deepwater areas.