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0 20221004 - 20221004

DOI: https://doi.org/10.11698/PED.20220144

Sequence stratigraphy, sedimentary evolution and reservoir distribution prediction of rimmed platform in the third and fourth members of Sinian Dengying Formation, Gaomo area, Sichuan Basin, SW China

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  • 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploration, Southwest Petroleum University, Chengdu 610500, China;
    2. Sichuan Natural Gas Geology Key Laboratory, Southwest Petroleum University, Chengdu 610500, China;
    3. CNPC Key Laboratory of Carbonate Reservoirs Southwest Petroleum University Division, Chengdu 610500, China;
    4. Research Institute of Petroleum Exploration and Development, PetroChina Southwest Oilfield Company, Chengdu 610041, China;
    5. Southwest Geophysical Research Institute, BGP, CNPC, Chengdu 610213, China

Received date: 2022-02-27

  Revised date: 2022-05-20

  Online published: 2022-06-24

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Abstract

Based on comprehensive analysis of core, thin section, logging and seismic data, the sequence stratigraphy and sedimentary evolution of the third and fourth members of Sinian Dengying Formation (Deng 3 and Deng 4 members for short) in the Gaomo area of Sichuan Basin were investigated, and the favorable zones for reservoir development in the Deng 4 Member were predicted. (1) Two type I and one typeⅡsequence boundaries are identified in the Deng 3 and Deng 4 members; based on the identified sequence boundaries, the Deng 3 and Deng 4 member can be divided into two third order sequences SQ3 and SQ4, which are well-developed, isochronal and traceable in this area; the SQ3 thins from west to the east, and the SQ4 thins from northwest to southeast. (2) The sedimentary environment from the depositional period of SQ3 to SQ4 has experienced the evolution from mixed platform to rimmed carbonate platform, and the platform rimmed system on the west side is characterized by the development of platform margin microbial mound and shoal assemblages. The intra-platform area in the east is a restricted platform facies composed of a variety of dolomite, and there are local micro-geomorphic highlands of different scales and scattered intra-platform mounds and shoals. (3) The Deng 4 Member reservoirs, with obvious facies- controlled characteristic, are mainly distributed in the upper part of high-frequency upward shallow cycle and the high-stand systems tract of the third-order sequence vertically, and are more developed in the platform margin belt than in the intra-platform belt, and more developed in the Gaoshiti platform margin belt than in the west Suining platform margin belt on the plane. (4) Three types of favorable reservoir zones of Deng 4 Member have been finely delineated with 3D seismic data; among them, the mound and shoal facies zones developed in the ancient highlands in the intra-platform are the first choice in the next exploration and development of the Deng 4 Member.

Key words： Sinian Dengying Formation; rimmed platform; sequence stratigraphy; sedimentary evolution; reservoir distribution; favorable exploration zone; Gaomo area; Sichuan Basin

Cite this article

TAN Lei, LIU Hong, CHEN Kang, NI Hualing, ZHONG Yuan, TAN Xiucheng, YAN Wei, ZHANG Xuan, LYU Wenzheng, ZHANG Kun . Sequence stratigraphy, sedimentary evolution and reservoir distribution prediction of rimmed platform in the third and fourth members of Sinian Dengying Formation, Gaomo area, Sichuan Basin, SW China[J]. Petroleum Exploration and Development, 0 : 20221004 -20221004 . DOI: 10.11698/PED.20220144

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