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首页> 外文期刊>Journal of Natural Gas Geoscience >Types of abnormal high-pressure gas reservoir in foreland basins of China
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Types of abnormal high-pressure gas reservoir in foreland basins of China

机译：中国前陆盆地异常高压气藏类型

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Abnormal pressure commonly exists in foreland basins that are closely related to the oil and gas reservoir. A deep understanding of the distribution of the said kind of pressure in various reservoirs and characteristic types of abnormally high-pressure gas reservoirs are supplementary to the theory of the fluid storage tank. This paper analyzed in detail the characteristics of this atypical distribution of high-pressure in typical local and foreign foreland basins, as well as their relationship with gas reservoirs. The three types of abnormal high-pressure gas reservoirs are identified as follows: box type, top seal type, and pressure transfer type. The box type is mainly characterized by the reservoir of a source reservoir superposition with a stable structure. The unusual high pressure occurs in the reservoir and the cap rock, which are mainly results of hydrocarbon supercharging and under-compacting deposition. The top seal type is predominated by the high pressure in the cap rock, while the pressure in the reservoir may be normal or not. The abnormally high pressure may be caused by under-compacted deposition, strong oil and gas filling, as well as tectonic compression. It is also worth noting that the pressure transfer type is dominated by secondary gas reservoirs with active tectonics. The pressure has a decreasing trend from the deep to the shallow area due to the formation of pressure conduction caused by pressure relief or deterioration of storage conditions, as well as lithological changes brought by fractures. Determining the types of abnormal high-pressure gas reservoirs have a great significance to the exploration of the said gas reservoirs themselves. Moreover, their classification can avoid accidental drillings in the foreland basin.
机译：异常压力通常存在于与油气储层密切相关的前陆盆地中。对流体在各种储层中的压力分布和异常高压储气层的特征类型的深刻理解是对储液罐理论的补充。本文详细分析了典型的本地和外国前陆盆地中这种非典型高压分布的特征，以及它们与气藏的关系。三种异常高压气藏类型分别为：箱型，顶密封型和压力传递型。箱型的主要特征是具有稳定结构的源储层叠加的储层。异常高压发生在储层和盖岩中，这主要是烃类增压和欠压实沉积的结果。顶部密封类型主要由盖岩中的高压决定，而储层中的压力可能正常或不正常。异常高的压力可能是由于沉积不足，强油气填充以及构造压缩所致。还值得注意的是，压力传递类型主要由构造活跃的二次气藏主导。由于压力释放或储藏条件的恶化以及裂缝带来的岩性变化，形成了压力传导，压力从深到浅逐渐减小。确定异常高压气藏的类型对探索所述气藏本身具有重要意义。此外，它们的分类可以避免在前陆盆地中意外钻探。

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