Oil & Gas Geology ›› 2017, Vol. 38 ›› Issue (6): 1079-1086.doi: 10.11743/ogg20170608

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Seismic recognition and zonation of the platform margin facies of the Sinian Dengying Formation in central Sichuan Basin

Zeng Fuying1,2, Yang Wei1, Sun Ai1, Jin Hui1, Xie Wuren1, Ma Shiyu1, Su Nan1   

  1. 1. College of Geophysics, Chengdu University of Technology, Chengdu, Sichuan 610059, China;
    2. PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China
  • Received:2016-12-15 Revised:2017-06-21 Online:2017-12-28 Published:2018-01-08

Abstract: The Sinian Dengying Formation platform margin facies is developed in east and west of the Mianzhu-Changning Rift,Sichuan Basin,where oil and gas accumulated.Seismic recognition,fine characterization and distribution features of the platform facies zones are carried out by means of detailed interpretation of seismic facies and horizon flattening.Seismic reflection features of facies zones on the platform margin are "dome-shaped" or brackish-shaped,with internal messy or earthworm-like reflections,moderate to weak amplitudes,and low to intermediate frequencies.Three stages of platform margin zones,Z2dn1,Z2dn2 and Z2dn4,developed in east and west of the Mianzhu-Changning Rift,and two stages of platform margin zones developed in Z2dn2.The Z2dn1 platform margin zone is distributed in eastern area of the Anyue-Lezhi,trending in near North-South direction.The Z2dn2 platform margin zone is distributed in a semi-circle shape.The Z2dn4 platform margin zone trends in near north-south direction to the south of the Anyue,and in northeast-southwest direction in the Suining-Shehong area.The distribution pattern of the platform margin facies of the Sinian Dengying Formation in the central Sichuan Basin indicates that the Sinian Dengying Formation has favorable exploration zones.This characterization work gives some guidance for further oil and gas exploration.

Key words: horizon flattening, seismic facies, platform margin facies zone, isolated platform, Dengying Formation, Sichuan Basin

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