Hydrocarbon Accumulation Regularity In Member One Of Nantun Formation Of Nanbeier Depression

Based on studying the structural and sedimentary background and making full use of the study area geology, pysical exploration, well logging and all kinds of analysis data, we have studied all kinds of hydrocarbon accumulation conditions by petrolrum geology, sedimentary petrology, geochemistry and geophysics in the first member of Nantun formation in Nanbeier depression.We have summarized the types and distribution of hydrocarbon reservoirs in the first member of Nanbeier formation by making use of probing and indication of hydrocarbons. All of these show that the types of hydrocarbon reservoir include deserve fault shelter hydrocarbon reservoir, fault block hydrocarbon reservoir, and fault-lithology hydrocarbon reservoir. In the plane, the main hydrocarbon accumulation is the northern trough and southern trough of eastern sub-sag. The reservoir mainly distributes in the special lithologic section and the lower part of the first member of Nantun formation. The Nanbeier depression hydrocarbon accumulation and distribution main factors includes source distribution cotrolling hydrocarbon distribution range.The two regional caprocks, reservoirs and structure influnencing the hydrocarbon accumulation horizon, early extensional fault providing barrier conditions.By compositely making use of homogenization temperatures of fluid inclusions and illite dating technology, the resault combining the stratigraphic burial history, thermal history, hydrocarbon generation and expulsion history of source and faulting history recovery shows that the accumulation period of the first member of Nabeier formation is sedimentary advancee stage of Yimin formation.The main accumulation model includes antithetic fault tilting of fault upheaval combination traps hydrocarbon accumulation model,uplift in depression composite traps hydrocarbon accumulation model and depression litholic traps hydrocarbon accumulation model.Studied by those,we determine the favorable zones of flood mudstone section are located in southern trough of eastern sub-sag, and the cavorable zones of special litholic section and the lower section are distributed in northern and southern trough of eastern sub-sag in the first member of Nantun formation in Nanbeier depression.