文章摘要
覃素华.分方位马尔科夫链叠前地质统计反演在Q区块的应用[J].地质与勘探,2021,57(1):156-165
分方位马尔科夫链叠前地质统计反演在Q区块的应用
Application of pre-stack geostatistical inversion of sub-azimuth Markov chain in block Q of an oilfield
投稿时间:2019-09-24  修订日期:2020-08-12
DOI:10.12134/j.dzykt.2021.01.014
中文关键词: 分方位 各向异性 马尔科夫链 贝叶斯公式 解释模板
英文关键词: sub-direction, anisotropy, Markov chain, Bayesian formula, interpretation template
基金项目:国家科技重大专项(编号:2017ZX05018-004)和国家项目配套项目(编号:2018D-5010-07)
作者单位E-mail
覃素华 东方地球物理公司研究院地质研究中心河北涿州 qinsuhua@cnpc.com.cn 
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中文摘要:
      Q区块目的层为砂泥岩薄互层,常规方法预测的储层精度不能满足油田时下需求。通过调研,认为薄互层具有各向异性,“两宽一高”地震数据的出现,为各向异性解释提供了数据基础。通过理论分析,采用分方位马尔科夫链地质统计反演预测储层展布规律。该方法为马尔科夫链转移概率与贝叶斯遗传概率相结合,同时利用地震波组特征进行约束。方位信息的加入为储层预测精度的提高提供了选项。突破了以往只在碳酸盐岩及基岩各向异性反演的认知限制,使碎屑岩薄储层中的各向异性得以体现。通过理论与实践结合,证实了优势方位的储层预测精度优于其他方位。
英文摘要:
      The target layer of block Q in an oilfield is a thin interbed layer of sand and mudstone, where the reservoir accuracy predicted by the conventional method cannot meet the current requirement of the oilfield. Our investigation suggests that this thin interbed has anisotropy, and the appearance of “two widths and one high” seismic data provides a data basis for anisotropic interpretation. Through theoretical analysis, the geostatistical inversion of the sub-azimuth Markov chain is used to predict the distribution law of the reservoir. This method combines Markov chain transition probability with Bayesian genetic probability and constrains it with seismic wave group features. The addition of orientation information provides an option for improving reservoir prediction accuracy. It breaks through the cognitive limitation of anisotropic inversion only in carbonate rock and bedrock, which makes the anisotropy be expressed in the thin reservoir of clastic rock. Combination of theory and practice proves that the reservoir prediction accuracy of the dominant azimuth is better than other orientations.
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