LITHOLOGIC RESERVOIRS ›› 2015, Vol. 27 ›› Issue (5): 225-231.doi: 10.3969/j.issn.1673-8926.2015.05.036

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Reservoir property differences of Donghetang Formation in Bachu and Tazhong area

Liu Lu, Peng Jun, Wu Huiming, Zhang Hanbing   

  1.  School of Earth Science and Technology , Southwest Petroleum University , Chengdu 610500 , China
  • Online:2015-09-26 Published:2015-09-26

Abstract:

On the basis of rock thin section, cathodoluminescence and physical properties, the reservoir characteristics of Donghetang Formation in Tarim Basin were studied, and the reservoir property differences in Bachu and Tazhong area were analyzed. The reservoir properties in Tazhong area are better than that in Bachu area, and the reservoir is characterized by medium porosity and medium permeability, however the reservoir in Bachu area is tight. The differences are caused by sedimentation and diagenesis. The sedimentary facies in Bachu area is shoreface subfacies with weak hydrodynamic conditions and high content of clay. The Tazhong area developed foreshore subfacies which has strong hydrodynamic conditions and low content of clay. The content of quartz in Bachu area is less than that in Tazhong area, but the debris content is higher, so the reservoir properties are poor. Carbonate cementation in Bachu area is stronger than that in Tazhong area, but dissolution is weaker, and porosity and permeability is low. In Tazhong area, a lot of the early dissolution of carbonate cement formed intergranular dissolved pores, and fractures developed, which results in high porosity and good physical properties.

Key words:  ant tracking , imaginglogging , fracture prediction , fracture modeling , Qingxi Oilfield

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