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Auto recognition of carbonate microfacies based on an improved back propagation neural network

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Abstract

Though traditional methods could recognize some facies, e.g. lagoon facies, backshoal facies and foreshoal facies, they couldn’t recognize reef facies and shoal facies well. To solve this problem, back propagation neural network (BP-ANN) and an improved BP-ANN with better stability and suitability, optimized by a particle swarm optimizer (PSO) algorithm (PSO-BP-ANN) were proposed to solve the microfacies’ auto discrimination of M formation from the R oil field in Iraq. Fourteen wells with complete core, borehole and log data were chosen as the standard wells and 120 microfacies samples were inferred from these 14 wells. Besides, the average value of gamma, neutron and density logs as well as the sum of squares of deviations of gamma were extracted as key parameters to build log facies (facies from log measurements)—microfacies transforming model. The total 120 log facies samples were divided into 12 kinds of log facies and 6 kinds of microfacies, e.g. lagoon bioclasts micrite limestone microfacies, shoal bioclasts grainstone microfacies, backshoal bioclasts packstone microfacies, foreshoal bioclasts micrite limestone microfacies, shallow continental micrite limestone microfacies and reef limestone microfacies. Furthermore, 68 samples of these 120 log facies samples were chosen as training samples and another 52 samples were gotten as testing samples to test the predicting ability of the discrimination template. Compared with conventional methods, like Bayes stepwise discrimination, both the BP-ANN and PSO-BP-ANN can integrate more log details with a correct rate higher than 85%. Furthermore, PSO-BP-ANN has more simple structure, smaller amount of weight and threshold and less iteration time.

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Authors and Affiliations

  1. Institute of Oil & Gas, Peking University, Beijing, 100871, China

    Yu-xi Wang  (王玉玺), Bo Liu  (刘波), Xue-feng Zhang  (张学丰), Jian-qiang Liu  (刘建强) & Ze-pu Tian  (田泽普)

  2. School of Earth and Space Science, Peking University, Beijing, 100871, China

    Yu-xi Wang  (王玉玺), Bo Liu  (刘波), Xue-feng Zhang  (张学丰), Jian-qiang Liu  (刘建强) & Ze-pu Tian  (田泽普)

  3. China United Coalbed Methane Limited Company, Beijing, 100011, China

    Ji-xian Gao  (高计县)

  4. School of Energy Resource, China University of Geosciences, Beijing, 100083, China

    Shun-li Li  (李顺利)

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  1. Yu-xi Wang  (王玉玺)
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Correspondence to Bo Liu  (刘波).

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Foundation item: Project(41272137) supported by the National Natural Science Foundation of China

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Wang, Yx., Liu, B., Gao, Jx. et al. Auto recognition of carbonate microfacies based on an improved back propagation neural network. J. Cent. South Univ. 22, 3521–3535 (2015). https://doi.org/10.1007/s11771-015-2892-0

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  • DOI: https://doi.org/10.1007/s11771-015-2892-0

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