中国南方天然沥青、油气苗分布与找油气关系

从中国南方地表广泛分布的天然沥青、油气苗的产出特征、水化学性质及沥青演化阶段入手,结合区域构造、热作用、保存条件与区内已知的油气田对比剖析,对除四川盆地已知油气田以外的中古生界地层裸露区的断拗进行保存条件及地覆构造研究,结果表明:寻找保存条件相对较好,热作用适中的地带进行勘探,可能发现断层圈闭、断高、生物礁气藏以及新生界构造造成岩性圈闭的次生气藏等;在那些保存条件好的地带,可能发现断层圈闭及潜伏生物礁气藏;但在广泛古生界地层裸露区,特别是碳酸岩发育的地带,普遍见天然沥青、油气苗及张性断裂,是找油气的不利区域。

THE RELATIONSHIP BETWEEN DISTRIBUTION OF NATURAL ASPHALT,OIL AND GAS SEEPAGE AND EXPLORATION IN SOUTH CHINA

Based on the extensive surface natural asphalt, oil and gas seepage hydro-chemical property and asphalt evolution stage, integrated with regional tectonic, thermal degradation, preservation condition and the correlation of known oil and gas field, it is pointed out the preservation and potential structure study should be done on the fault-depression at Mesozoic and Paleozoic outcrop areas. It is in the area with good preservation and thermal action is procreating that fault trap and organic reef gas pool will be found. It is not favorable area to find gas field in the area, which the natural asphalt commonly occurs and oil and gas seepage and extensional fracture are developed.