渤海湾盆地天然气聚集带特征及形成条件

根据渤海湾富油盆地天然气的分布特征，探讨了该盆地主要天然气聚集带的地质特征及形成条件。该盆地较大规模的天然气聚集带均与石炭 二迭系煤成气有关；油型气聚集带主要是石油沿断裂向上运移过程中溶解气析离形成的浅层次生气。天然气聚集带的分布受二级构造带背景控制，主要天然气聚集带可归为隆起带型、凸起型、斜坡带型、断阶带型等。继承性发育的构造背景、有利的气源条件、良好的封盖保存等是控制天然气聚集带形成的主要地质因素

GEOLOGICAL CHARACTERISTICS AND FORMATION CONDITIONS OF THE NATURAL GAS ACCUMULATION BELTS IN BOHAI BAY BASIN

The geological characteristics and formation conditions for the main natural accumulation belts in Bohai Bay basin of East China are analyzed. The larger scale natural gas accumulation belts of the basin are all related to Permian\|Carboniferous coal\|genetic gas. The main oil\|type gas accumulation belts can be distributed in the shallow layers, and they are some secondary gas accumulation belts forming in the course of petroleum migration up along faults because of separating out of the resolved gas. The distribution of the natural gas accumulation belts are mainly controlled by the secondary structural belts. The main gas accumulation belts can be divided into four types of the uplift belt, prominence, fault bench belt and slope belt. The main controlling factors for generating natural gas accumulation belts in the basin include the excellent gas\|generating conditions, the secondary structural belts with long\|term developing and good sealing conditions.