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Characteristics,controlling factors and evolution of the Middle Devonian GuanwushanFormation reservoirs in Longmenshan area,northwestern Sichuan,China

Xiong Lian-qiao1,2,Yao Gen-shun2,3,Ni Chao2,3,Xiong Shao-yun2,3,Shen An-jiang2,3,Zhou Gang4,Hao Yi2,3   

  1. 1.Research Institute of Petroleum Exploration & Development,Beijing 100083,China;
    2.PetroChina Hangzhou Research Institute of Geology,Hangzhou 310023,China;3.Key Laboratory of Carbonate Reservoirs,CNPC,Hangzhou 310023,China;
    4.Exploration and Development Research Institute of PetroChina Southwest
    Oil & Gas Field Company,Chengdu 610041,China
  • Received:2017-04-19 Revised:2017-06-09 Online:2017-07-10 Published:2017-07-10

Abstract:

Hydrocarbon exploration has been made in the Middle Devonian Guanwushan Formation (D2g) in the Longmenshan area.However,studies on reservoirs are rare.In order to make a detailed study on the characteristics,controlling factors and evolution of the reservoirs in the D2g in northwestern Sichuan Basin,outcrops,cores,thin sections,cathode luminescence,and log data were analyzed.The result shows that the reservoirs in the D2g are dominantly comprised of rudstone dolomite,biohermal dolomite,bioclastic dolomite and crystal dolomite,with residual intragranular dissolved pores,intercrystalline dissolved pores (dissolved cavities) as the main storage space,an average porosity of 2.85%.Structural fractures were well developed.The reef-shoal dolomite fracture-dissolution-porous reservoirs are main reservoir types of the D2g.The formation of the reservoirs is controlled by reef-shoal facies,dolomitization and dissolution.Reef-shoal facies provided the geological background of the reservoirs development.Dolomitization was the necessary condition of the reservoirs development.Dissolution was the key factor of the reservoirs development,and tectonics promote the final formation of the reservoirs.The reservoirs have experienced three evolution stages,sedimentation,dolomitization and dissolution laid the foundation for storage space types of the reservoirs.Tectonics improved the physical properties of the reservoirs,while the filling of asphaltic decreased the physical properties of the reservoirs.Based on the main controlling factors of Guanwushan reservoirs,dolomitized reef-shoal on the high geomorphology area among Jiange,Jiangyou and Mianyang area is predicted as the most favorable reservoir zone where will possibly haveexploration breakthroughs.

Key words: Reservoir characteristics, Reservoir evolution mode, Reservoir controlling factors, Middle Devonian, Guanwushan Formation, Northwestern Sichuan Basin

CLC Number: 

  • TE122.2

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