Oil & Gas Geology ›› 2013, Vol. 34 ›› Issue (2): 153-160.doi: 10.11743/ogg20130202

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Reservoir types and distribution characteristics of large marine carbonate oil and gas fields in China

Wang Zecheng1, Zhao Wenzhi2, Hu Suyun1, Jiang Hua1, Pan Wenqing3, Yang Yu4, Bao Hongping5   

  1. 1. Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China;
    2. Exploration & Development Company, PetroChina, Beijing 100007, China;
    3. Tarim Oil & Gas Company, PetroChina, Kurla, Xinjiang 841003, China;
    4. Southwest Oil & Gas Company, PetroChina, Chengdu, Sichuan 610051, China;
    5. Changqing Oil & Gas Company, PetroChina, Xi'an, Shaanxi 710000, China
  • Received:2012-04-01 Revised:2013-02-28 Online:2013-04-28 Published:2013-05-02

Abstract:

Recent analysis of marine carbonate oil and gas fields in Tarim Basin,Sichuan Basin and Erdos Basin reveals that carbonate traps and reservoirs in China can be classified into 4 major categories (i.e.structural traps,lithologic traps,stratigraphic traps and hybrid traps) and 21 types.The paper focuses on only stratigraphic and lithologic traps as they are more common trap types in the country.The lithologic traps can be further classified into bioherm traps,grain bank traps and diagenetic traps.The stratigraphic traps can also be classified into fault-block buried hill traps,peneplain erosion paeleogeomorphologic traps,monadnock buried hill fracture-vuggy traps,quasi-bedded fracture-vuggy traps,stratigraphic wedge traps and stratigraphic onlap pinchout traps.The paper points out that the marine carbonate oil and gas fields on China mainland are mainly of stratigraphic and lithologic reservoirs with moderate to low abundance.The bioherm reservoirs and grain bank reservoirs develop and distribute in a bead-like shape along platform margin,while the peneplain erosion palaeogeomorphologic reservoirs present as the shape of crumbs;the fractured-vuggy reservoirs are distri-buted widely in the quasi0bedded shape.The large ancient uplift,slope zone and platform margin,are considered favorable areas for cluster distribution of lithologic and stratigraphic oil and gas reservoirs and therefore are regarded to have great potential for hydrocarbon exploration.

Key words: cluster distribution, stratigraphic trap, lithologic trap, hydrocarbon reservoir type, marine carbonate rock

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