BP神经网络法在三塘湖盆地芦草沟组页岩岩相识别中的应用

doi:10.12108/yxyqc.20190411

岩性油气藏 ›› 2019, Vol. 31 ›› Issue (4): 101–111.doi: 10.12108/yxyqc.20190411

BP神经网络法在三塘湖盆地芦草沟组页岩岩相识别中的应用

刘跃杰, 刘书强, 马强, 姚宗森, 佘家朝

中国石油吐哈油田分公司勘探开发研究院, 新疆哈密 839009

收稿日期:2019-01-09 修回日期:2019-03-20 出版日期:2019-07-21 发布日期:2019-06-21
作者简介:刘跃杰(1989-),男,硕士,工程师,主要从事储层地质建模方面的研究工作。地址:(839009)新疆哈密市伊州区石油新城街道吐哈石油基地勘探开发研究院。Email:lyj_215@sina.com。
基金资助:
十三五国家重大科技专项专题"吐哈-三塘湖盆地岩性地层油气藏分布规律与目标评价"（编号：2016ZX05001003-006）和中国石油股份有限公司重大科技专项"中国石油第四次油气资源评价"（编号：2013E-050206）联合资助

Application of BP neutral network method to identification of shale lithofacies of Lucaogou Formation in Santanghu Basin

LIU Yuejie, LIU Shuqiang, MA Qiang, YAO Zongsen, SHE Jiachao

Research Institute of Exploration and Development, PetroChina Tuha Oilfield Company, Hami 839009, Xinjiang, China

Received:2019-01-09 Revised:2019-03-20 Online:2019-07-21 Published:2019-06-21

摘要/Abstract

摘要： 对于复杂岩性页岩岩相的识别，传统的建立岩相图版的方法因未充分考虑到测井数据间的相似性造成的干扰以及与岩心实验数据尺度上的差异性，导致建立的识别图版中不同类别的样本点相互重叠、界限模糊，预测偏差较大。针对该问题，以三塘湖盆地马朗凹陷芦草沟组二段为例，在对储层特征充分认识的基础上，采用了一种基于主成分分析的BP神经网络方法，首先分析研究区岩心资料并对其进行归类组合，划分出富有机质纹层相、富碳酸盐纹层相和富凝灰质纹层相3种岩相类型，以便缩小与测井数据间的尺度误差；其次建立岩相图版并提取自然伽马、声波时差、补偿密度、补偿中子、电阻率等5条对岩相变化响应较为敏感的测井曲线，分析各主成分的因子载荷地质因素并优选出3个含有大量岩相信息的主成分PC2，PC3和PC4；最后建立起岩相与测井曲线间的映射关系，同时对研究区重点井芦1井进行了验证性的岩相识别。结果表明，与传统图版识别方法相比，将主成分分析与BP神经网络相结合的岩相识别方法可有效消除测井曲线相似性带来的干扰，解决因岩心数据与测井数据尺度不同所造成的预测偏差增大的问题，使岩相识别正确率得到明显提高。该方法对页岩岩相识别较为实用，具有一定的推广应用价值。

关键词: 主成分, 页岩岩相, BP神经网络, 测井参数, 芦草沟组, 三塘湖盆地

Abstract: For the identification of shale lithofacies,the traditional method of establishing lithofacies chart does not fully take into account the interference caused by the similarity of logging data and the differences in the scale of experimental data,which results in the overlap of different types of sample points in the established identification chart,the ambiguity of boundaries and the large deviation of prediction. Aiming at this problem,taking the second member of Lucaogou Formation in Malang Sag of Santanghu Basin as an example,based on the full understanding of reservoir characteristics,a BP neutral network method based on principal component analysis was adopted. Firstly,the core data of the study area were used to classified the lithofacies into three types,such as organicrich laminar facies,carbonate-rich laminar facies and rich tuff-grain laminar facies,so as to reduce the scale error with the logging data. Secondly,the lithofacies chart was established to extract logging curves such as AC,GR, DEN,CNL,R_t and so on,which were sensitive to the response of lithofacies,the factor loading geological factors of each principal component were analyzed,and three principal components PC2,PC3,PC4 containing a large amount of lithofacies information were selected. Finally,the mapping relationship between lithofacies and logging curves was established,and the lithofacies identification of well Lu1,a key well in the study area,was carried out. The results show that compared with the traditional chart identification method,the lithofacies identification method combining principal component analysis with BP neural network can effectively eliminate the interference caused by the similarity of logging curves and reduce the error caused by the difference between the core data and the logging data,as so to improve the accuracy of lithofacies identification. This method is practical for shale lithofacies identification and has certain application value.

Key words: principal component, shale lithofacies, BP neural network, logging parameters, Lucaogou Formation, Santanghu Basin

中图分类号:

P631.84

刘跃杰, 刘书强, 马强, 姚宗森, 佘家朝. BP神经网络法在三塘湖盆地芦草沟组页岩岩相识别中的应用[J]. 岩性油气藏, 2019, 31(4): 101–111.

LIU Yuejie, LIU Shuqiang, MA Qiang, YAO Zongsen, SHE Jiachao. Application of BP neutral network method to identification of shale lithofacies of Lucaogou Formation in Santanghu Basin[J]. Lithologic Reservoirs, 2019, 31(4): 101–111.

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BP神经网络法在三塘湖盆地芦草沟组页岩岩相识别中的应用

Application of BP neutral network method to identification of shale lithofacies of Lucaogou Formation in Santanghu Basin

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