Abstract：In order to study the evolution process of the troughs in the central fault depression belt in Hailaer-Tamuchage Basin and its control on effective source rock distribution,Tanan Sag was chosen as the target area.Based on 3D seismic interpretation data,fault throw-distance curves,the fault throw-depth curves,the stratigraphic sedimentary characteristics of trough section and the characteristics of transverse anticline between troughs of the major boundary faults were analyzed.The maximum fault throw back-stripping method was applied to restore the evolution history of faults,thus ancient trough distribution was defined,and the structural evolution law of troughs in Tanan Sag was discussed.Combined with the achievements of former researchers,the control of the troughs on effective source rock distribution was studied.The following conclusions were drawn.Based on the fault throw-depth curves and growth indexes,the active periods of the major boundary faults in Tanan Sag were determined,and the stratigraphic deposition periods of the upper part of Nantun1 Formation and the Nantun2 Formation were determined as the main evolution periods of troughs.Combined with the major boundary fault growth mechanisms (isolated fault growth mechanism and fault segmentation growth connection mechanism),the trough evolution model in Tanan Sag were divided into two patterns:troughs controlled by isolated fault and troughs controlled by segmental growth faults.According to the different trough evolution patterns,the through-controlled distribution of hydrocarbon source rocks was divided into two patterns:source rocks controlled by isolated troughs and sources rocks controlled by segmental growth troughs.Meanwhile,the activity of the major boundary faults controlled the formation of the accommodation space and evolution of effective source rocks.According to the oil and gas distribution and vertical oil-bearing area in Tanan Sag,the oil-bearing zones distribute like "potatos" horizontally in the effective source rock distribution area and along the major boundary faults,and mainly distribute in Nantun Formation and Tongbomiao Formation vertically.
纪文婷, 孙永河, 孙旭, 刘露. 塔南凹陷洼槽构造演化过程及对有效烃源岩分布的控制[J]. 石油地球物理勘探, 2020, 55(1): 176-186.
JI Wenting, SUN Yonghe, SUN Xu, LIU Lu. Tectonic evolution process of troughs and its control on effective source rock distribution in Tanan Sag. Oil Geophysical Prospecting, 2020, 55(1): 176-186.
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