Log Interpretation And Description Of The Yanchang Formation, Zhengyuan-Jing Chuan Area In Southern Ordos Basin

The construction location of Zhengyuan-jingchuan area is in the south of Ordos basin's natural loop syncline, the existing exploration achievement has already confirmed that Yanchang formation of Mesozoic in this area has good oil-gas exploration potential. The paper has done deep research in these aspects by log information and achieved satisfactory results, including reservoir parameters interpretation, calculations of water saturation calculations, the core electricity experiment, oil, gas and water identification and description in the regional distribution of oil-gas.1st, through the massive analyses and studies, and the synthesis comparison of many kinds of methods, we have obtained regional and empirical formulas which are suitable to Zhengyuan-jingchuan area. The calculation of water saturation has used Archie formula, and in determining the coefficient of Archie formula , we has done core electricity experiment to obtain more accurate formula parameter values , such as stratum factor constant a, lithology coefficient b, cement index m, saturation index n and resistivity of the formation water R_w. Through the comparison with rock data, actual interpretation results have high degree of coincidence with it.2nd, reservoir identification and identification of oil, gas and water: This research has used many kinds of recognition methods and has evaluated these methods. These methods involved the connection method of the electronic resistivity and the sound wave or the porosity, movable water method, the relative permeability method and analytic method making use of the processing results of computer. Finally, by using the BP neural network to verify the identification results, we have obtained the satisfactory effects.