KE89-MAh9 paleo-salient discovery in the slope of Mahu Sag and its hydrocarbon exploration significance
MENG Xiangchao1, WANG Xiaojun2, CHEN Yang1, QI Hongyan2, DOU Yang1, WANG Aixia2
1. Hangzhou Research Institute of Petroleum Geology, CNPC, Hangzhou, Zhejiang 310023, China; 2. Research Institute of Exploration and Development, Xinjiang Oilfield Company, PetroChnia, Karamay, Xinjiang 834000, China
Abstract：In order to explore the oil & gas potential among main-fans in the slope area of Mahu Sag,KE89-MAh9 paleo-salient of Permian is discovered between Huangyangquan Fan and Karamay Fan with the joint use of drilling,logging and seismic data.With refering to outcrops,the genesis and evolution process of the paleo-salient is comprehensively analyzed by different geophysical means such as fault growth index,seismic time slices,maximum ancient stress estimations with acoustic emission (AE),and the maximum ancient stress direction determined by formation microscanner image (FMI) logging.The control of paleo-salient on the deposition and accumulation of T1b1 formation is clarified.The following understanding are obtained based on our study:A.The paleo-salient top is an unconformity surface in T/P,controlled by the clamping of F1 and F2 co-sedimentary overthrust faults,formed by the near east-west overthrust of late Hercynian,and reconstructed and finalized by the right lateral sliding and twisting of early Indosinian; B.63.4km2/12 blocks with good configuration conditions is found in the T1b1 formation in the lower part of the south flank of the paleo-salient,revealing new formation overburden traps in the slope area of Mahu Sag.
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