| Interpreting Dual Laterolog Fracture Data in Fractured Carbonate Formation |
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| 作者姓名： | 邓少贵 王晓畅 邹德江 范宜仁 杨震 |
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| 作者单位： | College of Georesources and Information, China University of Petroleum , Dongying 257061, China |
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| 基金项目： | This paper is supported by the National High Technology Research and Development Program of China （No. 863-306-ZT01 02-3）.ACKN0WLEDGMENTS We would like to thank the President of China University of Petroleum, Tong Zhaoqi and geophysical expert Prof. Zhang Gengji, for their helpful guidance. We especially thank Dr. Li Shanjun for his great help on the theoretical computation of electric logging responses and James Chan, a foreign teacher at China University of Petroleum. |
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| 摘 要： | The estimation of fractures is key to evaluating fractured carbonate reservoirs. It is difficult to evaluate this kind of reservoir because of its heterogeneously distributed fractures and anisotropy, A three-dimensional numerical model was used to simulate the responses of the dual laterolog （DLL） in a fractured formation based on a macro-isotropic anisotropic model, Accordingly, a fast fracture computing method was developed. First, the apparent conductivity of the DLL is linearly related to the porosity of the fracture and the conductivity of pore fluid. Second, the amplitude difference of the deep and shallow apparent resistivity logs is mainly dependent on the dip angle of the fracture. Then the response of the DLL to a formation with dip angle fractures is approximately depicted as a function of the bulk resistivity of the rock, the porosity of the fractures and the conductivity of fracture fluid. This function can be used to compute the porosity of fracture quickly. The actual data show that the fracture parameters determined by the DLL closely coincide with the formation micro imager log.
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| 关 键 词： | 裂带 碳酸岩 成岩作用 岩石 化学成分 |
| 收稿时间： | 2005-11-15 |
| 修稿时间： | 2006-03-25 |
Interpreting Dual Laterolog Fracture Data in Fractured Carbonate Formation |
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| Deng Shaogui,Wang Xiaochang,Zou Dejiang,Fan Yiren,Yang Zhen.Interpreting Dual Laterolog Fracture Data in Fractured Carbonate Formation[J].Journal of China University of Geosciences,2006,17(2):168-172. |
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| Authors: | Deng Shaogui Wang Xiaochang Zou Dejiang Fan Yiren Yang Zhen |
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| Institution: | 1. Post-Graduation Program on Geodynamics and Geophysics, Federal University of Rio Grande do Norte, Natal, Brazil;2. Department of Geophysics, Federal University of Rio Grande do Norte, Natal, Brazil;3. INCT-GP/CNPq/CAPES-National Institute of Science and Technology in Petroleum Geophysics, Brazil;4. Department of Geology, Federal University of Rio Grande do Norte, Natal, Brazil;5. Department of Energy, Division of Petroleum Engineering, FEM, UNICAMP/CEPETRO, Campinas, Brazil |
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| Abstract: | The estimation of fractures is key to evaluating fractured carbonate reservoirs. It is difficult to evaluate this kind of reservoir because of its heterogeneously distributed fractures and anisotropy.A three-dimensional numerical model was used to simulate the responses of the dual laterolog (DLL) in a fractured formation based on a macro-isotropic anisotropic model. Accordingly, a fast fracturecomputing method was developed. First, the apparent conductivity of the DLL is linearly related to the porosity of the fracture and the conductivity of pore fluid. Second, the amplitude difference of the deep and shallow apparent resistivity logs is mainly dependenton the dip angle of the fracture. Then the response of the DLL to a formation with dip angle fracturesis approximately depicted as a function of the bulk resistivity of the rock, the porosity of the fractures and the conductivity of fracture fluid. This function can be used to compute the porosity of fracture quickly. The actual data show that the fracture parameters determined by the DLL closely coincide with the formation micro imager log. |
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| Keywords: | fracture dual laterolog carbonate rock reservoir |
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