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利用地球物理及地球化学资料,结合盆地模拟技术,系统分析丽水凹陷油气成藏地质要素,认为烃源岩、储集层、输导体系及构造运动是其油气成藏的主控因素。研究区古新统烃源岩类型多样,生排烃历史复杂,分布特征存在差异,致使凹陷内油气性质和分布的不同;储集层非均质性强烈,导致油气差异聚集,且油气藏主要分布于三角洲前缘和扇三角洲部位;输导体系在不同区域的差异性决定了油气藏组合类型的多样性和油气藏分布的复杂性;古新世至中新世的2期构造运动(瓯江运动、玉泉运动)影响了烃源岩的热演化,改造和破坏了油气藏,成为制约油气发现的主要因素。总结丽水凹陷的油气成藏规律为近源成藏,储层物性制约成藏,断裂活动决定成藏,并提出2个最有利油气勘探区带为中部反转构造带和西斜坡反向断裂带。
Based on geophysical and geochemical data and basin simulation techniques, the geologic elements of the Lishui sag are systematically analyzed. It is considered that source rocks, reservoirs, transport systems and tectonic movements are the main controlling factors for the hydrocarbon accumulation. The source rocks of the Paleocene in the study area are diverse in type and their history of hydrocarbon generation and expulsion is complex and their distributional characteristics are different, resulting in different oil and gas properties and distributions in the sag. The reservoir heterogeneity is strong, resulting in the differential accumulation of oil and gas, Distributed in the delta front and the fan delta. The differences of the transmission systems in different regions determine the diversity of reservoir types and the complexity of the reservoir distribution. The second stage tectonic movement from the Paleocene to the Miocene Jiang movement and Yuquan movement) have affected the thermal evolution of source rocks, altered and destroyed the reservoirs, and become the main factors that restrict the discovery of oil and gas. It is concluded that the hydrocarbon accumulation law in Lishui Sag is near-source accumulation and reservoir physical property restricts reservoir formation and fault activity to reservoir formation. Two favorable oil and gas exploration zones are proposed as central inversion structural belt and western slope reverse fault zone .