延长探区下古天然气聚集因素及有利区预测

摘要

In order to understand favorable area of lower paleozoic gas accumulation,combined with the geological characteristics of the test wells,analysis of the lower paleozoic palaeogeomorphology,structural evolution,distribu-tion of aluminum rocks and gas accumulation. We consider that all kinds of factors on the gas accumulation have controlling action. On the basis of comprehensive analysis,give four rules of lower paleozoic gas accumulation in Yanchang gas field. At last,predict the paleozoic gas favorable exploration area,the conclusion points out lower pa-leozoic gas exploration direction.%为了研究延长探区下古天然气聚集有利区，结合已有试气井地质特征，分析延长探区下古生界岩溶古地貌、古构造演化、铝土层分布与天然气聚集关系，结果表明天然气聚集由古地貌、古构造、铝土层分布等因素复合共同控制。在多因素综合分析研究基础上，总结出延长探区下古生界天然气聚集的4条规律，最终预测了子长北-安塞-延安-延长南部为延长探区下古生界天然气聚集有利区，研究结论为下古生界天然气勘探指明了方向。