生烃增压在超压形成中的作用——以东营凹陷西部为例

The Effect of Hydrocarbon Generation Pressurization in the Development of Overpressure——Taking the West Part of Dongying Depression as an Example

通过单井压力、剖面压力及地化特征分析表明了生烃增压在东营凹陷西部超压形成中的重要作用。通过有机质评价及烃源岩埋藏史-演化史分析探讨了生烃作用成为东营凹陷西部超压成因重要因素的机理。结合生烃增压分析,建立了东营凹陷西部增压模式,认为异常压力的演化分为三个阶段:正常压力阶段、欠压实及早期生烃阶段、大量生排烃阶段,生烃增压在超压形成的后期起到了重要作用。

Hydrocarbon generating pressure-boosting is important in the development of overpressure in West Part of Dongying Depression by analyzing single well pressure,profile pressure and geochemical characteristics.Through the evaluation of the organic matter and burial history- evolution analysis of the source rocks,the mechanism of hydrocarbon generation pressurization was discuss. Combined with hydrocarbon generation pressurization analysis,the generation model of overpressure in West Part of Dongying Depression was established and the evolution of overpressure was divided into three parts： the normal compaction stage,under-compaction and early maturation stage,the mass generation and expulsion of hydrocarbon. hydrocarbon generation pressurization has played an important role in the later stages of the overpressure formation.