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利用岩心、钻井地质及地球化学分析等资料,综合研究阿南凹陷特殊岩性段致密油地质特征及形成条件,并进行有利区分布预测。阿南凹陷致密油主要分布于下白垩统阿四段和腾一下亚段特殊岩性段,表现为岩性复杂、电阻率曲线呈刺刀状、地震响应明显等特征。特殊岩性段厚度大、分布范围广,广泛发育以泥岩、白云质泥岩和纹层状灰质泥岩为主的优质烃源岩。白云岩类和砂岩类致密储层与优质烃源岩紧密接触,致密储层有效厚度大、孔渗条件相对较好,具备形成致密油的有利条件。通过综合分析,预测有利区主要位于靠近洼槽中心的斜坡低部位。
Based on the data of core, drilling geology and geochemical analysis, the geologic characteristics and formation conditions of tight oil in the special lithology of Anan depression are comprehensively studied, and the prediction of favorable area distribution is made. The tight oil in the Anan sag is mainly distributed in the special lithology sections of the lower Cretaceous As-4 and Teng-1 subsurface, showing the characteristics of complex lithology, resistivity curve with bayonet and obvious earthquake response. The special lithologic sections have a large thickness and a wide range of distribution, and extensively develop high-quality source rocks mainly composed of mudstone, dolomitic mudstone and striated limestone mudstone. The tight dolomite and sandstone tight reservoirs are in close contact with the high-quality source rocks. The tight reservoirs have large effective thicknesses and relatively good pore-permeability conditions, which are favorable conditions for the formation of tight oil. Through comprehensive analysis, it is predicted that the favorable area is mainly located at the lower part of the slope close to the center of the depression.