摘要
墨西哥湾东部主体经历了中生代裂谷拉张、中侏罗世裂谷和地壳衰减、晚侏罗世洋壳形成及早白垩世的区域沉降4个演化阶段;西部主要受中生代太平洋板块向北美板块的俯冲影响,属弧后拉张。由于持续稳定的沉降,墨西哥湾沉积了巨厚的以海相地层为主的中生代地层,并提供了有利的烃源岩、储层和盖层。大量的构造、地层和复合型圈闭为油气富集提供了有利的场所。墨西哥湾盆地为典型的高演化拉张盆地,巴西东部(包括海区)为中等演化拉张盆地,二者均已成为重要的油气富集区。我国东部海区中生界南部以海相地层为主,北部以陆相地层为主,为一个低—中等演化的拉张盆地。前二者的油气富集规律为我国东部海区中生代盆地的找油提供了借鉴作用。
The principal part of the east Gulf of Mexico went through 4 evolution stages： the rift tensile in Mesozoic, the rift and earth crust attenuation in Middle Jurassic, the ocean crust came into being in Late Jurassic and regional subsidence occurred in Early Cretaceous. The west part was mainly subjected by the under-thrusting of the Pacific plate beneath the Eurasian plate, belonging to back arc spreading. Because of the stable and sustained subsidence of the basin, giganticly thick Mesozoic strata of marine layers deposited in the Gulf of Mexico, which supplied favorable petroleum source rocks, reservoir rocks and seal rocks. Lots of structural, stratigraphic and other complex traps supplied the favorable location for hydrocarbon accumulation. The Gulf of Mexico is a typical rifting basin at the stage of highly evolutive, and the east area （including sea area） in Brazil is at the stage of medium evolution, both of them have become the important hydrocarbon accumulation areas. The Mesozoic eastern seas of China belongs to a low-median rifting basin dominated by marine strata in the south, terrestrial strata in the north. Therefore, the foreign examples make sense for us to search petroleum in Mesozoic basins in the eastern sea area of China.
出处
《海洋地质动态》
北大核心
2010年第3期6-13,共8页
Marine Geology Letters
基金
国家专项(GT-YQ-QQ-2008)"墨西哥湾盆地油气地质综合研究与区域优选"(GT-YQ-QQ-2008-6-20)
关键词
裂谷盆地演化
生储盖
圈闭条件
油气富集规律
墨西哥湾
rifting basin evolution
source reservoir cap
trap condition
regular pattern of hydrocarbon accumulation
Gulf of Mexico
