Characteristics of the structural transition zone and its controll on reservoirs in Wulanhua depression
CAO Sijia1, LI Peng2, LIU Dongmin2, HU Shaohua2, GUO Bo2, CHEN Lin2
1. School of Earth Sciences, Northeast Petroleum University, Daqing, Heilongjiang, 163318, China; 2. BGP Geological Research Center, CNPC, Zhuozhou, Hebei 072750, China
Abstract:Seismic, drilling and logging data show that two stages of transfer zones have developed in the Wulanhua depression in Erlian basin. During the initial period of faulting depression (K1ba), Tumuer and Hongjing transfer zones were developed. The Tumuer transition zone is opposite overlap, and divided into two sags by a large low uplift. The Hongjing transition zone, in the form of “a transversal fault transition zone”, was developed in the orthogonal part of the Hongge fault and Hongjing fault in the southern sag. During the second period of depression spreading (K1bt1), Saiwusu,Tunan and Hongeer transfer zones were developed on the fault transform part along the sag-controlling boundary of the southern sag. The Saiwusu fault is syntropic unoverlap, while the Tunan fault and the Honggeer fault are syntropic overlap. During the third period of depression atrophying (K1bt2), the transfer zones were transformed by compression and inversion, and four reverse zones (Tumuer, Saiwusu, Hongjing and Honggeer) were developed. The transfer zones controlled the sedimentary structure, accordingly controlled the source and sedimentary system, and consequently controlled the reservoir distribution. The transfer zones reversed and uplifted during the transformation period are zones where hydrocarbon migrates and structural traps. The transfer zones are favorable for exploring stratigraphic-lithologic and structural- lithologic reservoirs in the Wulanhua depression.
曹思佳, 李鹏, 刘冬民, 胡少华, 郭波, 陈林. 乌兰花凹陷转换带特征及控藏作用[J]. 石油地球物理勘探, 2021, 56(2): 380-388.
CAO Sijia, LI Peng, LIU Dongmin, HU Shaohua, GUO Bo, CHEN Lin. Characteristics of the structural transition zone and its controll on reservoirs in Wulanhua depression. Oil Geophysical Prospecting, 2021, 56(2): 380-388.
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