苏北盆地古生界天然气勘探前景

EXPLORATION POTENTIAL OF GAS IN PALEOZOIC IN THE SUBEI BASIN

通过分析苏北盆地海相原型盆地改造史及海相烃源岩、海相油气演化史,系统研究了盆地地腹现今海相层构造格局及地层展布状况,认识到苏北盆地海相古生界有效烃源岩具有席片状分布、分割、重叠、不连续、晚期二次生烃、垂向远距离运移等特色,并据此进一步对苏北盆地海相有效烃源岩进行评价,指出由于苏北盆地具碎而小的特点及海相地层多遭改造的经历,未来的气田发现规模将以中小型居多。

Based on analysis of the reformation history of prototype marine basin and the evolutional history of marine source rocks and hydrocarbons in the Subei Basin, the present structural framework and distribution of the marine formations in the central part of the Subei Basin are systematically studied. It is believed that the effective source rocks in marine Paleozoic in the Subei Basin are characterized by sheet-like distribution, compartmentalization, superimposition, discontinuity, late secondary generation of hydrocarbons and long distance migration of hydrocarbons in vertical direction. The effective marine source rocks in this basin are further evaluated on the basis of these understandings. Future gas discoveries will be dominated by medium to small gas reservoirs because the Subei Basin is small and fractured and most of the marine formations have been reworked.