Oil & Gas Geology ›› 2009, Vol. 30 ›› Issue (6): 713-719.doi: 10.11743/ogg20090607

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Characteristics and major controlling factors of reservoirs in the Xujiahe Formation of the central and western Sichuan Basin

Feng Mingshi1,2, Liu Jiaduo1,2, Meng Wanbin1,2, Wang Jun1,2, Zhang Xiang2, Feng Yanhong2   

  1. 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu, Sichuan 610059, China;
    2. Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu, Sichuan 610059, China
  • Received:2009-10-10 Online:2009-12-25 Published:2012-01-16

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Abstract:

In this paper,reservoir characteristics,sedimentation and diagenesis of the Xujiahe Formation in the central and western parts of the Sichuan Basin are studied through microscopy observation of cast thin sections,analysis of physical properties,scanning electron microscope and X-diffraction.The results show that pores in the Xujiahe Formation of the study area are mainly residual primary intergranular pores and intragranular dissolution pores.With an average porosity of 5.83% and average permeability of 0.283×10-3μm2,the reservoirs are classified as low-porosity and low-permeability reservoirs.Sedimentation and diagenesis are the main factors controlling the development of reservoirs.Favorable facies belts for the development of reservoirs are river mouth bar and underwater distributary channel microfacies in the delta front.Compaction is the main influencing factor which led to the loss of porosity in the reservoirs.Early rim cementation of chlorites helped to protect the residual primary intergranular pores,and dissolution contributed the most to the development of reservoirs.

Key words: reservoir characteristics, sedimentation, diagenesis, Xujiahe Formation, Sichuan Basin

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