粤东和南海东北部陆坡区中生界及烃源岩特征  

Characteristic of Source Rocks and Mesozoic in Continental Slope Area of Northeastern the South China Sea and East Guangdong of China

作　　者：钟广见[1] 易海[1] 林珍[1] 金华峰[1] 刘振湖[1] 

机构地区：[1]国土资源部广州海洋地质调查局,广州510760

出　　处：《新疆石油地质》2007年第6期676-680,共5页Xinjiang Petroleum Geology

摘　　要：研究区为中国3个海相侏罗系沉积区之一,属特提斯海的一个分支。这里艮口群小水组、蓝塘群上龙水组、吉水门组半深海相黑色泥岩,厚度巨大,达到4000m以上,为良好烃源岩。中、晚侏罗世随着燕山运动的逐渐增强,华南地块抬升为陆,海水从华南区块向东南退却。粤东地区中侏罗统以湖相沉积为主,塘厦组为深湖相沉积的厚层泥岩,是较好的烃源岩。在潮汕坳陷中、晚侏罗世仍处于浅海环境,向台西南盆地演变为半深海相沉积环境,其陆坡区发育良好的海相烃源岩。白垩纪,在粤东沿莲花山及河源深断裂发育一系列呈串珠状分布的湖盆,以河流和湖泊相沉积为主,夹火山碎屑沉积岩。由于燕山运动第Ⅲ幕的强烈活动,潮汕坳陷和台西南盆地都发生地壳抬升。潮汕坳陷白垩系为河流、湖泊相沉积。台西南盆地仍处于边缘海,发育一套海陆交互环境的沉积。仅在台西南盆地可发育良好的海相烃源岩。南海东北部陆坡区侏罗纪海相沉积具有较大的生油气资源潜力,是有待开拓的一个新领域。This studied area is one of three marine facies sedimentary areas of Jurassic in China and belongs to one embranchment of Tethys. Xiaoshui formation of Genkou group and Shanglongshui formation and Jishuimen formation of Lantang group are dominated by bathyal black shale over 4,000 m in thickness, belonging to good source rock.. During Middle-Late Jurassic, for the Yanshanian movement became stronger gradually, South China block uplifted gradually and sea-water retreated toward south-east direction. The Middle Jurassic in eastern Guangdong is dominated by lake-facies, Tangxia formation of it is thick deep-water lake-facies mud, being a good source rock with local distribution. In Chaoshan depression, the Middle-Late Jurassic is still in shallow-sea environment and becomes bathyal environment toward Taixinan basin, where the continental slope area is characterized by good marine source rock. In Cretaceous, there exist a string of bead-like lake basins along Lianhuashan and Heyuan deep faults, dominated by the sediments of river facies and lake facies intercalated with volcanoclastic sedimentary rock. Because of strong activity of the third episode of Yanshanian movement, Chaoshan depression and Taixinan basin are all uplifted, when the Cretaceous in Chaoshan depression assumed river and lake facies sediments, while Taixinan basin was still in marginal sea developed with continental-oceanic interaction environment sediments. So, dood marine source rock could only be found in Taixinan basin. It is believed that the Jurassic marine sediments in continental slope area of northeastern South China Sea possess greater potentials of hydrocarbon generation and oil resources, and should be one of new domains to be explored and developed in future.

关 键 词：粤东 南海 台西南盆地 潮汕坳陷 海相侏罗系 烃源岩 含油气远景 

分 类 号：TE111.3[石油与天然气工程—油气勘探]