Petroleum Exploration and Development >

2017 , Vol. 44 >Issue 1: 58 - 68

DOI: https://doi.org/10.11698/PED.2017.01.07

PETROLEUM EXPLORATION

Karst paleogeomorphology of the fourth Member of Sinian Dengying Formation in Gaoshiti-Moxi area, Sichuan Basin, SW China: Restoration and geological significance

  • JIN Mindong ,
  • TAN Xiucheng ,
  • TONG Mingsheng ,
  • ZENG Wei ,
  • LIU Hong ,
  • ZHONG Bo ,
  • LIU Qingsong ,
  • LIAN Chengbo ,
  • ZHOU Xinghe ,
  • XU Hu ,
  • LUO Bing
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  • 1. Southwest Petroleum University, Chengdu 610500, China;
    2. Key Laboratory of Natural Gas Geology, Southwest Petroleum University, Chengdu 610500, China;
    3. The Sedimentary and Accumulation Department of Key Laboratory of Carbonate Reservoirs, PetroChina, Southwest Petroleum University, Chengdu 610500, China;
    4. Geological Exploration and Development Research Institute, Chuanqing Drilling Engineering Company Ltd, Chengdu 610041, China;
    5. Exploration Division of PetroChina Southwest Oil and Gas Field Company, Chengdu 610041, China;
    6. Research Institute of Petroleum Exploration and Development, Southwest Oil and Gas Field Company, PetroChina, Chengdu 610041, China

Received date: 2016-04-19

  Revised date: 2016-12-18

  Online published: 2016-12-30

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Abstract

Based on 3-D seismic data and drill-hole data in Moxi-Gaoshiti area, the impression seismic thickness from the top of Longwangmiao Formation, which is easier traced, to the bottom of Cambrian System was selected to characterize the karst paleogeomorphology of the fourth Member of Dengying Formation. The paleogeomorphology of the member can be further divided into three geomorphic units: karst platform, slope and superimposed slope, which had different paleohydrologic conditions, and thus different karstification intensity and reservoir quality. Among them, the superimposed slope with the strongest dissolution, has larger solution groove and cave systems, where the reservoirs with mainly honeycombed dissolved pores and cavities as storage space, are best in quality; the platform slope with weaker dissolution, has smaller solution groove and cave systems, where the reservoirs are poorer than those in the superimposed slope; the karst platform with the weakest dissolution, has piebald karst systems mainly, where the reservoirs with mainly pinhole to smaller dissolved pores and cavities as storage space, are poorer in quality on the whole, but there are some good quality reservoir bodies in local areas. The results show that, besides the highly explored scarp belt, the karst platform with low exploration degree can also be favorable exploration area of the fourth member of Dengying Formation.

Key words： paleogeomorphology; karst platform; slope; superimposed slope; Cambrian Longwangmiao Formation; Sinian Dengying Formation; Moxi-Gaoshiti area; Sichuan Basin

Cite this article

JIN Mindong , TAN Xiucheng , TONG Mingsheng , ZENG Wei , LIU Hong , ZHONG Bo , LIU Qingsong , LIAN Chengbo , ZHOU Xinghe , XU Hu , LUO Bing . Karst paleogeomorphology of the fourth Member of Sinian Dengying Formation in Gaoshiti-Moxi area, Sichuan Basin, SW China: Restoration and geological significance[J]. Petroleum Exploration and Development, 2017 , 44(1) : 58 -68 . DOI: 10.11698/PED.2017.01.07

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