车西洼陷异常流体压力与油气运移聚集

本文综合应用试油实测压力与泥岩声波时差资料计算分析了车西洼陷异常流体压力的分布特征及其与油气运移聚集的关系。研究区沙河街组沙三段与沙口上亚鞋烃源岩中存在异常高孔隙流体压力，异常高压带的空间分布与大套泥岩的发育区以及生烃中心基本一致，平面上呈环带状分布，异常高压控制了研究区油气区域运聚，由洼陷中心向边部依次发育岩性油气藏、构造一岩性油气藏环带、潜山油气藏环带。古近系超压与古生界常压的配置是潜山油气成藏的主要动力。异常高压具有保护并改善深层储层物性的作用。

Abnormal Fluid Pressure and Petroleum Migration and Accumulation in Chexi Sag

Based on mud stone sonic log and measured fluid pressure, the paper analyzes the distribution of abnormal pressure in the Chexi sag, as well as its influence on petroleum migration and accumulation. Es3 and Es4 members act as source rocks,as well as overpressure strata in Chexi area. In horizon, pore fluid pressure circularly distribute, i. e, from the center to the margin of the sag, fluid pressure decreases gradually. Abnormal high pressure controlled petroleum migration and accumulation in this area, from the center to the margin of the sag, there are exist lithological reservoirs zone, structure- lithological reservoirs ring and buried--hill reservoirs ring in turns. In the Chexi sag, the combination of abnormal fluid pressure of early Tertiary with normal pressure system of Palaezoic promotes migration and accumulation of hydrocarbon in buried--hill reservoirs. And abnormal high pressure can improve deep reservoir property.