| Discrimination of Natural Fractures Using Well Logging Curve Unit |
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| 作者姓名： | LiuHongqi PengShimi ZhouYongyi XueYongchao |
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| 作者单位： | [1]InformationandResourceDepartment,UniversityofPetroleum,Beijing102249,China [2]GeologicalScientificResearchInstituteofShengliOilfieldCo.Ltd.,SINOPEC,Dongying257015,China [3]CollegeofPetroleumEngineering,UniversityofPetroleum,Beijing102249,China |
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| 摘 要： | It is very difficult to discriminate natural fractures using conventional well log data, especially for most of the matured oUfields in China, because the raw data were acquired with relatively obsolete tools. The raw data include only GR and SP curves, indicative of lithology, AC curves, used to calculate the porosity of the formation, and a set of logging curves from various electrode length resistivity by laterolog. On the other hand, these oilfields usually have a large amount of core data which directly display the characteristics of the formation, and enough information of injection and production. This paper describes an approach through which logging curves are calibrated in terms of the raw data, and then a prototype model of natural fractures is established based on the investigation of core data from 43 wells, totaling 4 000 m in length. A computer program has been developed according to this method. Through analysis and comparison of the features of logging curves, this paper proposes a new concept, the well logging curve unit. By strictly depicting its shape through mathematical methods, the natural facture can be discriminated. This work also suggests an equation to estimate the probability of fracture occurrence, and finally other fracture parameters are calculated using some experimental expressions. With this methodology, logging curves from 100 wells were interpreted, the results of which agree with core data and field information.
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| 关 键 词： | 天然断裂网 吉林油田 曲线单位 数量辨别 |
Discrimination of Natural Fractures Using Well Logging Curve Unit |
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| LiuHongqi PengShimi ZhouYongyi XueYongchao.Discrimination of Natural Fractures Using Well Logging Curve Unit[J].Journal of China University of Geosciences,2004,15(4):372-378. |
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| Authors: | Liu Hongqi Peng Shimi Zhou Yongyi Xue Yongchao |
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| Abstract: | It is very difficult to discriminate natural fractures using conventional well log data, especially for most of the matured oilfields in China, because the raw data were acquired with relatively obsolete tools. The raw data include only GR and SP curves, indicative of lithology, AC curves, used to calculate the porosity of the formation, and a set of logging curves from various electrode length resistivity by laterolog. On the other hand, these oilfields usually have a large amount of core data which directly display the characteristics of the formation, and enough information of injection and production. This paper describes an approach through which logging curves are calibrated in terms of the raw data, and then a prototype model of natural fractures is established based on the investigation of core data from 43 wells, totaling 4 000 m in length. A computer program has been developed according to this method. Through analysis and comparison of the features of logging curves, this paper proposes a new concept, the well logging curve unit. By strictly depicting its shape through mathematical methods, the natural facture can be discriminated. This work also suggests an equation to estimate the probability of fracture occurrence, and finally other fracture parameters are calculated using some experimental expressions. With this methodology, logging curves from 100 wells were interpreted, the results of which agree with core data and field information. |
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| Keywords: | Jilin oilfield fracture well logging curve unit quantitative discrimination |
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