中国近海新生代含油气盆地成煤特征

Coal-Forming Characteristics of Cenozoic Petroliferous Basins in Offshore China

对中国近海含油气盆地特征进行了探讨,讨论了构造、气候、沉积及物源特征,对比渤海湾盆地、南黄海盆地、东海陆架盆地、珠江口盆地、琼东南盆地、北部湾盆地及莺歌海盆地含煤地层发育情况,揭示中国近海盆地新生代煤层分布特征:中国近海盆地有3次成煤期,成煤环境一般,煤层层数多、厚度薄、煤阶低、展布局限;由北向南,由西向东,成煤时代逐渐变新,主要成煤期与构造事件、气候事件相一致。

Starting from the basic factors affecting coal forming, this paper discusses the features of tectonic, climate, sediment and prove- nance, correlates the coal-bearing strata in Bohai Bay basin, South Yellow Sea basin, East China Sea shelf basin, the Pearl River Mouth ba- sin, Qiongdongnan basin, Beibu Gulf basin and Yinggehai basin, and reveals the Cenozoic coal seam distribution characteristics in these China＇s offshore basins. The results show that there are three coal-forming stages in these basins, with general environment for coal form- ing, numerous coal layer, thin thickness, low coal rank and local extension, and the coal-forming eras gradually become newer from north to south and from west to east, the main coal-forming stages are consistent with the tectonic events and the climate events.