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Accumulation and distribution of natural gases in Xihu Sag, East China Sea Basin

TAO Shi-zhen, ZOU Cai-neng(Research Institute of Petroleum Exploration & Development,PetroChina,Beijing 100083,China)  
The geological conditions, geochemical characteristics, enrichment factors, distributing and accumulative belt of the natural gases in Xihu Sag, East China Sea Basin, are systematically studied based on plenty of exploration achievements in recent years. The key controlling factors of gas pool accumulation in the source rock(i.e.Pinghu Formation) are reservoir stratum, trap and accumulative condition. The controlling factors of natural gas pools formed above the source rock of Pinghu Formation(i.e. in Huagang Formation) are gas source faulting, reservoir stratum and trap condition. The enrichment and high yield of the natural gases is due to the following 4 factors: ① Four sets of favorable hydrocarbon source rocks provide enough hydrocarbons, and the hydrocarbon generation and expelling match well with the trap formation in time and space; ②Three favorable reservoirs exist in advantageous source-reservoir assemblage;③ The interlayer of sandstones and mudstones provides with a favorable preservative condition; ④ Fault activation and seal match hydrocarbon-expelling and reservoir formation. Vertically,the condensate oil reservoir is distributed in the upper stratum, and the gas-condensate is distributed in the lower stratum. Condensate oil-gas is luxuriant in the west sag, and is meager in the east sag; luxuriant in the south, and meager in the north.According to the systematic analysis of the oil-gas forming conditions,3 play zones are divided in Xihu Sag. Condensate oil-gas in hydrocarbon source stratum is rich in the west slope of the hydrocarbon-generating sag, and the play project for condensate oil should be performed in the slope of the sag. Condensate gas above hydrocarbon source stratum is rich in the bulge of the sag and the play project for condensate gas should be performed in the center bulge of the sag.
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