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Advances in Earth Science
    
A Logging Identification Method for Fractured Vuggy Carbonate Reservoirs Based on Curve Reconstruction: A Case Study from the Pz Formation in Karabulak Oil Field in the South Turgai Basin
Chen Kegui1, Liu Sixu1*,Wang Zhaofeng2,Zhang Yifei2
1.School of Geoscience and Technology, Southwest Petroleum University, Chengdu
610500, China;2.China Petroleum International Exploration and Development, Beijing 100032,China
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Abstract  The basement carbonate reservoirs, in the Karabulak oilfield of the Southern Turgay basin, have the characteristics of complex structure, variety of pore type and strong heterogeneity. And the identification of such reservoirs by single conventional logging method is always a difficult point in logging interpretation. In this paper, the response characteristics of conventional logging curves such as deep lateral resistivity, acoustic time difference, density and compensated neutron are used for reconstruction. Combined with the improved method of curve change rate, the response laws of fractured carbonate reservoirs, pore-cave reservoirs and fractured vuggy reservoirs on conventional logging curves are summed up respectively. And a new logging evaluation method for carbonate fractured vuggy reservoirs in the Karabulak oilfield of South Turgay basin is proposed. This method is used to identify reservoirs in K8 and K34 wells of this oilfield. The results show that the carbonate reservoirs in this area are mainly fractured-vuggy  type. Compared with the oil test conclusion and imaging logging, the method proposed in this paper accurately divided the reservoir type. And the efficiency and accuracy of the reservoir division have been greatly improved.

Key words:  Carbonate reservoirs      fracture-cavity identification      Conventional logging      Data processing      Reservoir division.     
Published:  07 November 2018
ZTFLH:  P618.13  
Fund: Project supported by the National Natural Science Foundation of China“The study on geophysical evaluation method of oil and potash in Sichuan Basin (No.41372103).
Corresponding Authors:  Liu Sixu(1993-), male, Leshan City, Sichuan Province, Master student. Research areas include Logging interpretation and reservoir evaluation. E-mail: 1138128439@qq.com.   
About author:  Chen Kegui(1959-), male, Zigong City, Sichuan Province, Professor. Research areas include petroleum geology, technology of well logging reservoir evaluation and survey research potash in Sichuan. E-mail: chenkegui@21cn.com.
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Chen Kegui, Liu Sixu, Wang Zhaofeng, Zhang Yifei. A Logging Identification Method for Fractured Vuggy Carbonate Reservoirs Based on Curve Reconstruction: A Case Study from the Pz Formation in Karabulak Oil Field in the South Turgai Basin. Advances in Earth Science, 0, (): 15-.

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http://www.adearth.ac.cn/EN/     OR     http://www.adearth.ac.cn/EN/Y0/V/I/15

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