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- W2089705783 abstract "American Institute of Mining, Metallurgical, and Petroleum Engineers, Inc. This paper was prepared for the 46th Annual Fall Meeting of the Society of Petroleum Engineers of AIME, to be held in New Orleans, La., Oct. 3–6, 1971. Permission to copy is restricted to an abstract of not more than 300 words. Illustrations may not be copied. The abstract should contain conspicuous acknowledgment of where and by whom the paper is presented. Publication elsewhere after publication in the JOURNAL OF PETROLEUM TECHNOLOGY or the SOCIETY OF PETROLEUM ENGINEERS JOURNAL is usually granted upon request to the Editor of the appropriate journal provided agreement to give proper credit is made. Discussion of this paper is invited. Three copies of any discussion should be sent to the Society of Petroleum Engineers office. Such discussion may be presented at the above meeting and, with the paper, may be considered for publication in one of the two SPE magazines. Abstract A method of restoring or normalizing the spontaneous-potential (SP) curve in thick fractured formations is presented. The Restored SP is then used to delineate the best drilling locations or recompletion candidates. Two case histories are reviewed:the application in the Marmaton zone in the Oklahoma Panhandle, andthe application in the Woodford zone in South Central Oklahoma. The Restored SP technique has been successfully applied in the above reservoirs which defy more conventional log analysis. Histories of application to areas of both high and low well density are reviewed. Introduction Most engineers and geologists are familiar with reservoirs which defy quantitative log analysis. This is often due to the inability to calculate porosity and to evaluate reserves from porosity and to evaluate reserves from log-derived properties. Shale content and fractures are two of the most common occurrences which render quantitative log analysis useless. We have experimented with the use of the SP curve to empirically evaluate reserves in fractured reservoirs with high shale content. Our approach is based on the generation of the SP being dependent upon some degree of permeability and that economically recoverable reserves are a function of permeability. A determination of permeability is not attempted but rather an empirical correlation of SP versus reserves. To apply the RSP technique, data must be gathered and analyzed for individual areas. This approach has been successfully used in two areas of Oklahoma to make recommendations to obtain leases, to drill or re-enter wells, and to recomplete wells. Basis of Restoration of Spontaneous Potential Curve To determine the ranking of sells in the order of permeability, it is necessary to normalize all SP curves to a common base. This is accomplished with the basic SP formula: (1)" @default.
- W2089705783 created "2016-06-24" @default.
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- W2089705783 date "1971-10-03" @default.
- W2089705783 modified "2023-09-25" @default.
- W2089705783 title "Use of the SP for Exploitation - Case Histories" @default.
- W2089705783 doi "https://doi.org/10.2118/3637-ms" @default.
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