CHARACTERISTICS OF PETROLEUM ACCUMULATIONS IN THE SOUTH CHINA SEA AND THEIR EXPLORATION POTENTIAL
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摘要:
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。
Abstract: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.
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Key words:
- petroleum play /
- exploration potential /
- buried hill /
- carbonate reef /
- deepwater deposition /
- South China Sea
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表 1 南海不同成藏组合油气特征
Table 1. Reservoir characteristics of different plays in South China Sea
成藏组合 油气藏个数 探明可
采油当量/亿t占南海总储量
百分比/%上部成藏组合 165 26.7 35.25 中部成藏组合 300 41.6 54.92 下部成藏组合 76 3.46 4.57 基岩成藏组合 16 3.99 5.27 
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表 2 2011—2015年南海不同成藏组合探明油气可采储量
Table 2. The characteristics of proven recoverable reserves from different plays in the South China Sea in 2011—2015
成藏组合 探明可采储量 油/万t 气/亿m3 油当量/亿t 上部 3.69 3 732 3.11 中部 4.13 5 082 4.24 下部 2.03 26 0.02 基岩 0.35 52 0.04 合计 10.20 8 892 7.41
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