Well-logging Evaluation Methods on Carbonate Reservoirs

Abstract

Abstract:

The logging evaluation methods and techniques on domestic and foreign carbonate reservoir were researched from the four aspects of reservoir type classification, parameter characterization, fluid property discrimination and mathematical method. After the analysis and comparison of various evaluation methods, it is considered that according to certain mathematical algorithms, not only the reservoir types were identified very well, but also the reservoir parameters were evaluated semi-quantitatively and quantitatively by the use of the conventional logging and imaging logging. The physical parameters of fracture cave reservoir were calculated using the data of conventional logging and new logging technologies (electrical logging and sonic logging), and on this basis, the fluid property can be discriminated by the conventional logging, nuclear magnetic resonance and dipole shear sonic logging. By comparison with the results of core analysis, this method for calculating reservoir parameters is not only effectiveness, but also simple and feasible. The mathematical method and the new logging technique data are very important for the complex carbonate reservoir evaluation, and can solve the calculation and evaluation problems of complex carbonate reservoir. Using reservoir characteristics of carbonate rocks and fluid properties as the starting point, with combination of geological, seismic and logging data, and mathematical algorithms, the reservoir types and fluid properties were accurately identified and determined, thus the physical parameters of fracture cave reservoirs (carbonate reservoirs) were accurately calculated, which were the focus and direction of logging evaluation on carbonate reservoirs.

Key words: carbonate reservoir, parameter calculation, fluid property, mathematical method, well logging

XU Jing-Ling, WANG E-Jing, CAO Guang-Wei, QIN Yu-Xing. Well-logging Evaluation Methods on Carbonate Reservoirs[J]. Geoscience, 2012, 26(6): 1265-1274.

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