黄骅坳陷中区应力场及与天然气富集的关系

RELATIONSHIP BETWEEN STRESS FIELD AND NATURAL GAS ENRICHMENT IN CENTRAL HUANGHUA DEPRESSION

杨玉凤 史占祯 王明明 蔺洁

Yang Yufeng Shi Zhanzhen Wang Mingming Lin Jie

应用有限元计算机模拟法,对渤海湾盆地黄骅拗陷中区沙河街组一段底界的应力场进行了分析,根据其分布特征、性质及与天然气富集的关系,认为弱张强剪伴挤压的地应力环境最有利于天然气聚集。渤海湾盆地中的较大气田多与压扭应力环境有关,主要原因是烃源层内的天然气易于生成、排出且能形成封闭性很好的圈闭。

The stress field of the bottom of the First Member of the Shahejie Formation in the central part of Huanghua Depression in Bobai Bay Basin was analyzed by applying finite element computer simulation.According to its distribution characteristics, its property and the relation between the stress field and gas enrichment, it is suggested that the environment of weak extension and strong shearing stress is favourable for natural gas accumulation.It has been proved that bigger gas fields in the Bobai Bay Basin are almost associated with compressoshear stress environment.The main cause for this is that the environment is beneficial for natural gas generation and expulsion, and it is also favorable to form good sealing traps.

10.11743/ogg19960304