川西北梓潼地区上三叠统异常高压气藏的形成条件

Conditions Forming Gas Reservoirs with Abnormally High Pressure inUpper Triassic at Zitong Region in Northwest Sichuan

针对川西北地区上三叠统异常高压的问题,本文在分析异常高压成因的基础上,提出在多种成因中烃类的生成与排出是影响压力大小和天然气富集的主要因素;在评价生、储、盖条件和总结超压气藏特征的基础上,提出了气藏的形成模式和找气方向。

Aimed at the problem of abnormally high pressure in Upper Triassic in Northwest Sichuan, and based on analyzing the geneses of the abnormally high pressure, this paper proposes that in many geneses the generation and exhaustion of hydrocarbons are the major factors which influ-ence the pressure value and the gas accumulation. Based on evaluating the source-reservoir-caprock conditions and summarizing the characteristics of the gas rcscrvoirs with superpressure, the authors also propose the forming model of the gas reservoirs and the direction for searching gas.