CAJ | 학술논문

南大西洋两岸被动陆缘盆地经历了相似的构造演化历史，在早白垩世阿普特期发育了区域性分布的盐岩。在对南大西洋中段两岸6个主要含盐盆地的区域构造、沉积演化及油气成藏综合研究的基础上，通过各盆地盐构造样式的地震剖面解析，将盐盆划分为伸展区、过渡区和挤压区3个盐构造带。巴西大陆边缘盆地发育的盐下烃源岩现今仍处于生油窗内，而西非盐上烃源岩的成熟速率高于盐下烃源岩，主要由于盐岩具有较高的热导率，能抑制盐下烃源岩的生烃，促进盐上烃源岩热成熟。盐流动产生多种样式的盐构造，为盐上油气聚集提供了构造圈闭条件。盐相关圈闭是盐上重要的圈闭类型，富集的油气储量占南大西洋被动陆缘盆地盐上油气总可采储量的84．8％。伸展区发育的盐窗作为输导通道，控制油气主要于盐上层系成藏。同时盐岩作为厚层的区域盖层控制了过渡区到挤压区的盐下油气成藏。
남대서양량안피동륙연분지경력료상사적구조연화역사，재조백성세아보특기발육료구역성분포적염암。재대남대서양중단량안6개주요함염분지적구역구조、침적연화급유기성장종합연구적기출상，통과각분지염구조양식적지진부면해석，장염분화분위신전구、과도구화제압구3개염구조대。파서대륙변연분지발육적염하경원암현금잉처우생유창내，이서비염상경원암적성숙속솔고우염하경원암，주요유우염암구유교고적열도솔，능억제염하경원암적생경，촉진염상경원암열성숙。염류동산생다충양식적염구조，위염상유기취집제공료구조권폐조건。염상관권폐시염상중요적권폐류형，부집적유기저량점남대서양피동륙연분지염상유기총가채저량적84．8％。신전구발육적염창작위수도통도，공제유기주요우염상층계성장。동시염암작위후층적구역개층공제료과도구도제압구적염하유기성장。
South Atlantic passive margin basins experienced a similar tectonic evolution and regionally distributed salt was deposited during the Aptian. Based on a comprehensive study of regional tectonics, depositional environ?ment and hydrocarbon accumulation, integrated with the study of salt?related structural styles determined by ana?lyzing regional seismic sections, three tectonic belts, which include extensional domain, transitional domain and compressional domain, were recognized in the 6 main salt basins. The pre?salt source rocks in the Brazil salt basins are still in the oil window. In West Africa, the post?salt source rocks experienced a higher maturation rate than the pre?salt source rocks. The salt has a relatively higher thermal conductivity and can restrain the hydrocarbon generation of the pre?salt source rocks but accelerate that of the post?salt source rocks. The salt flow resulted in several kinds of salt?related structural traps for hydrocarbon accumulation in the post?salt sequences. Reserves in the post?salt related structural traps account for 84.8% of the total post?salt reserves. The salt windows developed in the extensional domain served as hydrocarbon migration pathways and controlled hydrocarbon accumulations in the post?salt sequence. The thick salt provided a regional cap rock, which controlled the pre?salt hydrocarbon accumulations in the transitional?compressional domain.