摘要
华南大陆南缘和台湾地区发育的中生代海相地层揭示,该区晚三叠世—白垩纪时曾遭受2次海侵。从海水入侵方向分析,南海北缘东部的海区也相应地发育2套中生代海相沉积岩系。地震资料和钻井资料证实,本区珠江口盆地潮汕坳陷和台西南盆地发育巨厚的中生界,上三叠统—下侏罗统以暗色页岩为主,代表水体宽阔、环境稳定的深海相沉积;下白垩统岩性以砂页岩为主,代表环境变化较大的浅海相和海陆过渡相沉积。上三叠统—下侏罗统与下白垩统之间为角度不整合接触。该区中生代地层具有优越的生、储、盖组合和构造圈闭条件以及油气生成、聚集和保存条件,油气资源前景良好。
Mesozoic marine strata developed on the southern margin of the South China continent and the Taiwan Region reveal that two marine invasions occurred in this region from the Late Triassic to Cretaceous. From an analysis of the direction of seawater invasion, correspondingly there must be two sequences of Mesozoic marine sediments in the eastern sea area of the northern edge of the South China Sea because the region was the passageway of the transgression. According to the seismic and drilling data, very thick marine Mesozoic strata are developed in the Chaoshan depression of the Zhujiangkou (Pearl River mouth) basin and the Taixinan (southwestern Taiwan) basin in the study region and may be divided into the Upper Triassic-Lower Jurassic and Lower Cretaceous. The former consists dominantly of dark-colored shale, belonging to abyssal sediments deposited in the wide waters and stable environment; whereas the latter, sandstone-shale, representing neritic and paralic sediment deposited in the highly varied environment. The contact between the Upper Triassic-Lower Jurassic and Lower Cretaceous is unconformable. There are a good association of petroleum source rocks, reservoir rocks and seal rocks and structural traps in the Mesozoic strata, as well as good conditions for the generation-migration-accumulation-preservation of petroleum; so the region has good petroleum prospects.
出处
《地质通报》
CAS
CSCD
北大核心
2004年第2期142-146,共5页
Geological Bulletin of China
关键词
南海北部边缘东部海域
中生界
油气勘探前景
eastern sea area of the northern margin of the South China Sea
Mesozoic
oil/gas exploration
