异常高压与油气成藏机理

与正常压力环境相比，在相同条件下，异常高压烃源层中有机质的成熟度和产气率明显偏低，而产油率较高。有证据表明，高压产生的微裂缝不仅是烃类垂向运移的重要通道，而且明显改善了储集层的储集性能。高压泥岩对断层和不同相态烃类的封盖作用是天然气聚集和成藏的关键因素之一。分析异常高压系统中温度与压力的关系，结合实例阐述了异常高压对油气形成、运移、聚集、封盖、成藏和颁上的作用与影响，并从理论上探讨了异常高压对成藏作用的机理和控制条件。

The relationship between overpressure and reservoir forming mechanism

Compared with the normal pressure system, under the same condition, the maturation and gas production rate of organic matter in overpressure system are obviously lower, whereas the oil production rate is relatively higher. It can be argued that the microfractures resulting from overpressurenot only act the vertical pathway for hydrocarbon migration but also prominently improve the porosity and permeability of the reservoir. One of the key factors that determine the accumulation and pooling of natural gas is the sealing for the fault and hydrocarbon in various forms by the high pressured mudstone. the authors of this paper analyzed the relation between the temperature and pressure in overpressure system, illustrated the role of overpressure in the formation, migration, accumulation, sealing, pooling and distribution of the hydrocarbon with case study and discussed the controlling mechanisms of overpressure on the reser voir forming.