岩性油气藏 ›› 2020, Vol. 32 ›› Issue (5): 122–132.doi: 10.12108/yxyqc.20200513

• 技术方法 • 上一篇    下一篇

基于叠后地震数据的裂缝预测与建模——以太阳—大寨地区浅层页岩气储层为例

王建君1, 李井亮2, 李林1, 马光春2, 杜悦1, 姜逸明2, 刘晓2, 于银华2   

  1. 1. 中国石油浙江油田分公司 勘探开发一体化中心, 杭州 310023;
    2. 北京蓝海智信能源技术有限公司, 北京 100101
  • 收稿日期:2020-01-12 修回日期:2020-05-08 出版日期:2020-10-01 发布日期:2020-08-08
  • 第一作者:王建君(1982-),男,硕士,高级工程师,主要从事常规及非常规油气田开发研究和管理工作。地址:(310023)浙江省杭州市西湖区留下镇荆山岭路中国石油浙江油田分公司勘探开发一体化中心。Email:wangjj85@petrochina.com.cn。
  • 基金资助:
    国家科技重大专项“昭通页岩气勘探开发示范工程”（编号：2017ZX05063）资助

Fracture prediction and modeling based on poststack 3D seismic data: a case study of shallow shale gas reservoir in Taiyang-Dazhai area

WANG Jianjun1, LI Jingliang2, LI Lin1, MA Guangchun2, DU Yue1, JIANG Yiming2, LIU Xiao2, YU Yinhua2   

  1. 1. Exploration & Development Integrated Center, PetroChina Zhejiang Oilfield Company, Hangzhou 310023, China;
    2. Beijing Lanhaizhixin Energy Technology Co., Ltd., Beijing 100101, China
  • Received:2020-01-12 Revised:2020-05-08 Online:2020-10-01 Published:2020-08-08

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摘要： 太阳—大寨地区在钻井过程中常见泥浆漏失、压裂施工压力高等现象，鉴于叠后三维地震资料几何属性定量预测裂缝的可靠性和精度存在尺度及破碎程度的量化分级问题，提出了基于地震几何属性的裂缝地震相识别和裂缝确定性提取及建模方法。综合应用地震倾角属性、曲率属性和非连续性等多属性，以贝叶斯概率模型为基础，通过无监督聚类分析获得最佳的聚类效果和聚类数；垂向采用逐个时间切片扫描法建立裂缝的空间体系，并对追踪得到的所有线状结构进行清理去噪，简化复杂几何结构，对清理后的裂缝进行网格化重构，计算了裂缝的几何（拓扑）参数，建立了高精度离散裂缝模型。结果表明，应用该方法在太阳—大寨地区浅层页岩气区块准确预测了水平井钻进过程中的断裂和裂缝发育位置，断层和裂缝预测准确率达到92%，有效规避了钻井泥浆漏失，并对压裂设计提供了有力支撑。裂缝地震相识别与离散裂缝网络模型的建立为有效解决该区页岩气藏钻井工程、压裂工程等复杂施工问题提供了依据。

关键词: 无监督聚类分析, 裂缝地震相, 离散裂缝网络, 裂缝网格重构, 浅层页岩气, 太阳—大寨地区

Abstract: There are Common problems such as mud loss and high fracturing pressure during drilling in TaiyangDazhai area. The reliability and accuracy of quantitative prediction of fractures by geometric attributes of poststack 3D seismic data are always restricted. A modeling method based on the joint application of fracture seismic facies and discrete fracture deterministic extraction technology was proposed. By using seismic attributes such as dip angle,curvature and discontinuity,unsupervised clustering analysis based on Bayesian probability model was carry out to obtain the best clustering effect and number. The spatial system of fracture was established by vertical time slice scanning method,and all the linear structures traced were cleaned and denoised to simplify the complex geometry structure. The cleaned fractures were gridded and reconstructed. The geometric(topological) parameters of each fracture were calculated and a high-precision discrete fracture model was established. The results show that this method can be used to accurately predict the location of fault and fracture in the process of horizontal well drilling in shallow shale gas block of Taiyang-Dazhai area,and the prediction accuracy of fault and fracture reaches 92%,effectively avoiding drilling mud loss,and providing a strong support for the fracturing design. The identification of fracture seismic facies and the establishment of discrete fracture network model provide an effective basis to solve the complex construction problems during drilling and fracturing of shale gas reservoir in this area.

Key words: unsupervised cluster analysis, fracture seismic facies, discrete fracture network, fracture grid reconstruction, shallow shale gas, Taiyang-Dazhai area

中图分类号: 

  • P631.4
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