中国北方六盘山盆地新生界油气包裹体的发现及其油气地质意义

在六盘山盆地新生界清水营组石膏中发现了大量的油气包裹体，而油气包裹体的研究对认识盆地新生界油气成藏条件，拓展盆地油气勘探思路具有重要的意义.通过野外地质调查、样品采集和分析测试等手段对清水营组石膏中油气包裹体的发育特征和组成特征进行研究，并开展油源对比，分析油气包裹体中油气的来源和形成过程，探讨了六盘山盆地新生界油气成藏条件和运聚特征.结果表明:清水营组结晶状石膏中油气包裹体中原油来源于清水营组烃源岩；纤维状石膏脉中油气包裹体原油来源于白垩系马东山组烃源岩.六盘山盆地清水营组泥岩具有生烃潜力，是盆地潜在的烃源岩；白垩系烃源岩生成的油气可以沿着断裂等输导体系向上覆地层运移，并在新生界聚集，沟通白垩系烃源岩断层附近的新生界圈闭是六盘山盆地有利的油气聚集区. 

Discovery and Petroleum Geologic Significance of Cenozoic Hydrocarbon Inclusions in Liupanshan Basin,North China

A large quantity of hydrocarbon inclusions were found in the gypsum of Cenozoic Qingshuiying Formation in Liupanshan basin, which is of a crucial significance to the understanding of the oil and gas reservoir-forming conditions and the development of exploration concept. Development and composition features of hydrocarbon inclusions in gypsum of Qingshuiying Formation were studied by field geological investigation, sample collection and laboratory analysis, etc. Sources and formation of the oil and gas were analyzed by oil-source correlation, and then the conditions and characteristics of petroleum accumulation in Cenozoic of Liupanshan basin were studied. The results show that the oil in the crystal gypsum was derived from the hydrocarbon source rock of Qingshuiying Formation, while the oil in the filament gypsum was derived from the hydrocarbon source rock of Cretaceous Madongshan Formation. The hydrocarbon source rock of Qingshuiying Formation has certain hydrocarbon generating potential, which is the potential source rock in Liupanshan basin. The oil and gas was derived from the Cretaceous hydrocarbon source rock, which can migrate to the upper formation along the fault, and accumulate in Cenozoic. The reservoir traps near the faults connected to the Cretaceous source rock are the favorable oil accumulation zones in Cenozoic.