超压的形成机理及其对生烃的影响

Formation Mechanism of Overpressure and Its Effects of Hydrocarbon Generation

分析异常高压形成机理,认为异常高压形成机理主要与沉积作用、构造作用、烃类生成、流体热膨胀、矿物成岩作用有关,其中以沉积压实作用增压和生烃增压两种机理最为重要,具普遍性。异常高压不仅影响烃类相态和生烃产物,且对烃源岩的成熟度有抑制作用,阻碍有机质的成熟。地层压力超过一定门限时会对成烃产生明显的抑制作用。

Analyzing various mechanisms of forming abnormal high-pressure,the mechanisms have relationship with sedimentary action,structural action,hydrocarbon generation,liquid thermal-expansion and mineral diagenetic change and the sedimentary action and hydrocarbon generation are the most important and universality.Abnormal high-pressure not only controls the generative phases of hydrocarbons but also results in restraining maturity of sourcerock and retarding Maturity of organic matter.When pressure exceeds a certain threshold,it obviously restrains hydrocarbon generation.