| 南海北部深水西区石油地质特征及勘探前景 |
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| 关键词:deepwater area of northwestern South China Sea exploration frontier petroleum geological characteristics exploration prospects |
| 基金项目:中国海洋石油总公司前瞻性区域研究项目（编号：CN00CRC-KTY-2002-KT-002） |
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| Petroleum Geological Conditions and Exploration Prospects in Deepwater Area of Northwestern South China Sea |
| The deepwater area of northwestern South China Sea is a petroleum exploration frontier, which consists of southwestern Shenhu massif, Yongle massif, and most parts of the central depression zone in Qiongdongnan Basin. This area is a part of passive margin of northern South China Sea, which experienced two evolutionary phases of rifting and post-rifting. Based on lots of seismic and drilling data available for the deepwater area and its adjacent areas, this paper points out that there exist not only excellent petroleum geological characteristics but also migration-accumulation conditions in the area: ① There are 3 types of source rocks, 5 rich hydrocarbon depressions and great potential resources; ② There are 4 reservoir-seal pairs, namely, the pair of Ling-III fan deltaic or littoral sandstones combined with the Ling-II transgressive mudstone, the pair of sandstones in the Sanya-Meishan Formations littoral facies and LST fans combined with the bathyal or abyssal facies mudstone of Meishan-Yinghuang Formations, the pair of LST fans of Huangliu Formation combined with the bathyal facies mudstone of Yinghuang Formation, and the pair of Miocene limestone combined with the Yinghuang Formation mudstone. ③ Multiple traps of structures, lowstand deposit bodies and reef limestones are developed in groups and belts; ④ There are all kinds of vertical and lateral pathways and 3 types of migration-accumulation models, i.e., the overpressure-normal pressure drastically-changing model, the overpressure-normal pressure transitional model, and the overpressure source model. The deepwater area has similar petroleum geological conditions to areas abroad where deepwater exploration has been very successful. The deepwater area is therefore a prospective frontier and has quantities of potential resources. However, the exploration in the deepwater area is a frontier characterized by high risks, high techniques, and high expenditures, and hence the exploration in the deepwater area should be conducted in accord with the strategy of "step by step operation from shallower to deeper area". |
| TAO Wei-xiang,ZHAO Zhi-gang,HE Shi-bin,DING Fang.2005.Petroleum Geological Conditions and Exploration Prospects in Deepwater Area of Northwestern South China Sea[J].Acta Geoscientica Sinica,26(4):359-364. |
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