Oil & Gas Geology ›› 2017, Vol. 38 ›› Issue (1): 110-120.doi: 10.11743/ogg20170112

• Petroleum Geology • Previous Articles     Next Articles

Characteristics and evolution of sedimentary sequences of the 3rd member of Shahejie Formation in Shuangtaizi tectonic belt, the Liaohe Depression

Man Xinxin1,2, Wang Hongliang2, Shan Junfeng1   

  1. 1. College of Energy Resources, China University of Geosciences(Beijing), Beijing 100083, China;
    2. PetroChina Petroleum Liaohe Oilfield Company Exploration and Production Research Institute, Panjin, Liaoning 124010, China
  • Received:2016-11-09 Revised:2016-12-16 Online:2017-02-28 Published:2017-02-27

Abstract:

The Shuangatizi area in Liaohe Depression with multi-typed provenances and complicated sedimentary conditions has not been well explored.Armed with terrestrial rift basin sequence stratigraphy and sedimentology theories,the authors studied the sedimentary facies in the sequence stratigraphic framework of the third member of Shahejie Formation (Sha-3 member) through comprehensive analysis of core facies marks,drilling/logging and seismic data.Three sedimentary facies were identified,including the fan delta,the sublacustrine fan and the lacustrine facies.A sequence stratigraphic framework with 3 third-order sequences (namely the lower Sha-3 sequence,the middle Sha-3 sequence,the upper Sha-3 sequence) was also established by using relevant theories and technologies for the third member.It shows that sublacustrine fans were developed extensively during the full sycle of the lower and the ascending half cycle of the middle Sha-3 sequences,fan deltas were developed in the north part of the area and sublacustrine fans were developed in the south part of the area during the descending half cycle of the middle Sha-3 and the full cycle of the upper Sha-3.In general,the sublacustrine fans show features of migration towards the central depression with scales changing from small to large and then to small again.

Key words: sequence stratigraphy, sedimentary facies, 3rd member of Shahejie Formation, Shuangtaizi tectonic belt, Liaohe Depression

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