HYDROCARBON ACCUMULATION MODEL FOR OVERPRESSURE BASIN: AN EXAMPLE FROM THE YINGGEHAI BASIN
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摘要: 超压沉积盆地分布广泛,对油气勘探具有重要意义。超压盆地具备良好的油气成藏条件:超压地层不仅是有利的生油层,亦是有效的封盖层;异常高压流体活动改善储层物性,控制圈闭形成与分布;超压流体活动形成断层、裂缝,改善油气运移输导网络,为油气运移提供了动力。通过研究提出了超压盆地漏斗状网毯式油气成藏模式,指出高压底辟体是超压盆地油气成藏之核心,油气在高压驱动下沿漏斗状输导体系运移到底辟体上覆低势区成藏。Abstract: Overpressure sedimentary basins are widely distributed and of great significance to hydrocarbon exploration. This kind of basins has many advantages for hydrocarbon accumulation:The overpressure formation is not only a beneficial source rock, but also an effective capping layer. Abnormal high pressure fluid flowing through reservoirs may meliorate the reservoir properties and control the formation and distribution of traps. Overpressure fluid flow may improve the oil and gas migration system, and provide a driving force for oil and gas migration. Based on the study of overpressure basins, we put forward in the paper a funnel-shaped meshwork-carpet type hydrocarbon accumulation model. The overpressure diapir is the core for hydrocarbon accumulation in overpressure basins. Driven by high pressure, oil and gas will migrate along the funnel-shaped passage system into the overlying low-potential zone above the diapir.
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Key words:
- overpressure basin /
- hydrocarbon accumulation model /
- Yinggehai Basin
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