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Fracture and vug character of Ordovician carbonate reservoir in Tazhong Oilfield
TANG Hong1,2, XIE Lin1 , SU Bo3, HAN Tao4
(1.School of Resource and Environment,Southwest Petroleum University, Chengdu 610500, China;2.Sichuan Province University Key Laboratory of Natural Gas Geology, Chengdu 610500, China; ;3.Oil & Gas Evaluation Center of CPL, Xi 'an 710054,China; ;4.Reservoir Section of Exploitation Department of Tarim Oilfiled, Kuerle 841000, China)
Abstract:
Statistical and stochastic modeling methods were adopted to analyze, quantitatively calculate and predict carbonate reservoir fracture and vug character of Ordovician reservoir in Tazhong Oilfield based on core, FMI and normal wireline logging data. The results show that fractures and vugs developed intervals are characterized by obvious low resistivity and maximum amplitude difference, high interval transit time and low logging density. Fractures are developed in Yingshan formation, which makes fracture permeability become largely higher than matrix permeability. Fractures and vugs have obvious effects on reservoir reconstruction and flowing proterties.
Key words:  reservoir  fracture description  stochastic modeling  carbonate reservoir  Ordovician