Citation: | Shao-gui DENG, Xiao-chang WANG, De-jiang ZOU, Yi-ren FAN, Zhen YANG. Interpreting Dual Laterolog Fracture Data in Fractured Carbonate Formation. Journal of Earth Science, 2006, 17(2): 168-172. |
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.
Jiang, L. Z., Gu, J. Y., Guo, B. C., 2004. Characteristicsand Mechanism of Low Permeability Clastic Reservoir inChinese Petroliferous Basin. Acta Sedi mentologica Sinica, 22 (1): 13 -18 (in Chinese with English Abstract). |
Li, S. J., Xiao, C. W., Wang, H. M., et al., 1996. Math-ematical Model of Dual Laterolog Response to Fractureand Quantitative Interpretation of Fracture Porosity. Acta Geophysica Sinica, 39 (6): 845 -852 (in Chinese withEnglish Abstract). |
Luo, L., Hu, P. Y., Zhou, Z. Y., 2001. Log Identificationfor Fracture in Carbonate. Acta Petrolei Sinica, 22 (3): 32 -35 (in Chinese with English Abstract). |
Ouyang, J., 1994. Log Interpretation and Reservoir Descrip-tion. Petroleum Industry Press, Beijing (in Chinese). |
Pezard, P. A., Anderson, R. N., 1990. In Situ Measure-ments of Electrical Resistivity, Formation Anisotropy andTectonic Context. SPWLA31st Annual Logging Sympo-sium, Lafayette, Louisiana. |
Sibbit, A. M., Faivre, O., 1985. The Dual Laterolog Re-sponse in Fractured Rocks. SPWLA 26th Annual Log-ging Symposium, Dallas, Texas. |
Tan, T. D., 1987. Log Interpretation Model and Evaluation Method of Fractured Reservoir. Petroleum Industry Press, Beijing (in Chinese). |
Wei, Q. G., Jia, C. Z., Song, H. Z., et al., 2000. Ordovi-cian Structural Depositional Model and Prediction forProfitable Crack Reservoir of Carbonate Rockin TazhongArea, Tari m Basin. Acta Sedi mentologica Sinica, 18 (3): 408 -412 (in Chinese with English Abstract). |
Yuan, M. S., 2000. Exploration of Low Permeability Frac-tured Reservoir. Petroleum Industry Press, Beijing (inChinese). |
Zhang, G. J., 1984. Electrolog. Petroleum Industry Press, Beijing (in Chinese). |