莺歌海盆地CO2分布及初步预测研究

莺歌海盆地富ＣＯ２天然气是泥底辟构造带特有产物，主要分布于该带浅层含气组合体系，且受控于泥底辟发育演化、展布和伴生热流体的上侵活动，其平面分布多具东高西低、南高北低的分区分块性特点，纵向总体分布则具分带分层性特征。根据富ＣＯ２天然气分布规律，采用地质综合分析类比方法，在综合分析各种地质、地球物理及地球化学资料的基础上，对盆地高ＣＯ２风险区进行了初步预测，指出本区纵向上存在２个低ＣＯ２富烃气带，平面上分布有３个低ＣＯ２富烃气区，其中尤以超浅层和中深层区带最佳，是近期勘探有利区带。图３参５（梁大新摘）

The preliminary prediction and occurrence of CO 2 in Yinggehai basin.

The CO 2 rich gas is the characteristic product of the mud diapiric structure zones in Yinggehai basin. The regional occurrence of CO 2 is focused on the shallower gas bearing systems and is controlled by the development and distribution of mud diapirs and the upward invasion of the associated hot fluids. The regional occurrence in the mud diapir zones shows the blocking features, with the gas bearing area high eastward low westward and high southward low northward geographically. The vertical occurrence presents the zoning and bedding characters. According to the distribution rule of the CO 2 rich gas in the region, the authors made a preliminary prediction of the high CO 2 risk in the basin, based on the integration of the various geological, geophysical and geochemical data, and then pointed out that there exist two profuse gas bearing zones with low CO 2 content vertically and three big profuse gas bearing provinces with low CO 2 content laterally. The super shallow beds and medium deep zones are the most favorable plays, which may serve as the exploration targets in the near future.