大庆长垣以西天然气成藏条件定量分析

A Quantitive Analysis of the Nature Gas Accumulation Conditions in the West of Daqing placanticline

在综合地质研究基础上，利用逐步回归分析方法对长垣以西天然气藏影响因素进行定量分析，结果表明，H和SPG油层的天然气藏具有不同的成藏条件、控制因素和分布规律，SPG油层的天然气主要与构造类型，地层水矿化度、这移通道、圈闭规模等因素有关，流体沿断裂长距离水平运移、天然气释放并在沿途局部构造中聚集成藏是本层气藏形成机理：H油层天然气主要受断裂控制，断裂不仅提供了下伏地层中夭然气向上运移的通道，而且为H油层天然气聚集成藏提供了圈闭条件，断裂倾向盘的天然气聚集效应是H油层天然气分布的重要表现。天然气运聚成藏具有近距离沿断裂垂向运聚的特征。

Based on the comprehensive geoogical study and by means of the gradual regressive analytical method, this paper gives a quantitive analysis of the factors which affect the natural gas accumulation in the west of Daqing placanticline . The studies show that H and SPG oil reservoir have different natural gasaccumulation conditions, controlling elements and distribution regularities. The gas accumulation in SPGoil reservoir mainly relates to such factors as the tectonic type, the formation water degree ofmineralization , migrating passage and trap scale etc . The formation principle of SPG oil reservoir is that fluid migrates horizontally along a long distance, the natural gas is released and accumulated into gas reservor in the traps of migration passage . The gas accumulation in H oil reservoir is chiefly controlled by fault acting, which not only provides the migrating passage for the underneath natural gas to move upalong, but also provides the trap conditions for the gas gathering in the H oil reservoir . The fault dip blockgas accumulation effect is the important expression of the gas distribution of H oil reservoir . The gasaccumulation has the chaseterishc of upmigrating short distantly along the fault passages.