Reservoir classification and evaluation based on petrophysical facies:A case study on the pay set Ⅱ in Member 3 of Eocene Liushagang Formation in eastern Wushi sag,Beibu Wan Basin
Zeng Xiaoming, Zhang Hui, Zou Mingsheng, Huang Dongmei, Mo Fengyang
Zhanjiang Branch of CNOOC, Zhanjiang 524057,Guangdong
Abstract Currently, most of the reservoir classification are based on the physical characteristics of reservoirs,rather than genetic mechanism. Take the pay set Ⅱ in Member 3 of Eocene Liushagang Formation as the study object,the sedimentary characteristics,diagenesis and tectonic features were studied to analyse their influences on the physical properties of reservoirs based on the analysis of assaying,drlling,logging and testing data. The results showed that subaqueous distributary channel of the inner and outer fan delta front,sheet sands were developped in the Member 3 of Liushagang Formation in eastern Wushi sag,Beibu Wan Basin;three types of diagenetic facies, mud matrix filling,unstable components dissolution and strong compaction, were identified;the fracture facies were mainly composed of none fracture facies,with network fractures and high-angle fractures appeared partially in layers. Then the petrophysical facies can be classified through the superimpositions and coupling of the sedimentary facies,diagenetic facies and tectonic facies. Nine types of petrophysical facies such as underwater distributary channel of the inner fan delta front-mud matrix filling-high angle fracture were divided in this way. Three types of reservoirs—good reservoir class Ⅰ, intermediate reservoir class Ⅱ and poor reservoir class Ⅲ,were classified based on the characteristics of different types of petrophysical facies,which realized the classification and evaluation of reservoirs from the perspective of genetic mechanism.
Fund:Financially supported by National Science and Technology Major Project (No.2016ZX05024-006)
About author: Zeng Xiaoming,born in 1987,is an geological engineer. He is mainly engaged in researches of reservoir prediction and evaluation. E-mail: zengxm4@cnooc.com.cn.
Cite this article:
Zeng Xiaoming,Zhang Hui,Zou Mingsheng et al. Reservoir classification and evaluation based on petrophysical facies:A case study on the pay set Ⅱ in Member 3 of Eocene Liushagang Formation in eastern Wushi sag,Beibu Wan Basin[J]. JOPC, 2017, 19(4): 703-712.
Zeng Xiaoming,Zhang Hui,Zou Mingsheng et al. Reservoir classification and evaluation based on petrophysical facies:A case study on the pay set Ⅱ in Member 3 of Eocene Liushagang Formation in eastern Wushi sag,Beibu Wan Basin[J]. JOPC, 2017, 19(4): 703-712.
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