Research On Oil And Gas Accumulation Of Mid-shallow Layer In Denglouku Anticline Of Southeest Uplift In Songliao Basin

Based on the analysis test data about petroleum geology,geochemistry,geophysics, sequence stratigraphy comprehensively and the method of combining the data with the method of geological research and analysis,the authors have studied the hydrocarbon accumulation in the Denglouku anticline.This article is analized and studied detailedly,it is aimed at the condition of the hydrocarbon source rock such as the oil resource, the quality of the source rock and the capacity for providing hydrocarbon of the hydrocarbon source rock.According to the comparison and the analysis of the relevant geochemical indicators,such as the content of the organic carbon of the source rock,the content of the carbon isotope and the content of the group composition,it is considered that in the aspect of the resource of oil, the crude oil in the Denglouku anticline are mainly from the source rock in the deep K1yc,K1sh,and J3hs,secondly from the source rock in the shallow K1qn.In the aspect of the quality of the hydrocarbon source rock,the deep source rock is relatively good, the source rock in the K1qn is secondly good.The main passageway of the hydrocarbon accumulation is the discordogenic fault which communicate the shallow part with the deep part.The faults control the oil and gas migration in the area.The cap rock in the area is mainly the mudstone in the K1qn, K1q2 and deep K1yc,K1sh.The mudstone from the area has characters of big thickness,high closure coefficient,soft quality,they make a piece in the plane,so they are effective regional cap rocks.Considered these elements above, combined with the basic conditions of the hydrocarbon accumulation such as oil generation, storage, cap rock,trap,the reservoir formation regularity in the Denglouku anticline can be known by analyzing. The secondary hydrocarbon reservoir is the main reservoir in the middle-shallow layer,the fault that control the source is the main control factor of hydrocarbon accumulation. The native reservoir haven't been found in the area.The deep region of the area is the favorable regions which developed the native reservoir.