煤田地质与勘探2025，Vol.53Issue(4)：222-234,13.DOI:10.12363/issn.1001-1986.24.08.0547
五维地震属性在鄂尔多斯盆地东缘深部煤层气天然裂缝预测中的应用
Application of five seismic attributes in natural fracture prediction for deep coalbed methane production along the eastern margin of the Ordos Basin
摘要
Abstract
[Background]Natural fractures serve as both the primary storage space for free gas of deep coalbed methane(CBM)and pathways for hydrocarbon migration.Furthermore,these fractures can enhance the porosity and permeabil-ity of strata under the deep,high-pressure condition,significantly amplifying the permeability of coal seams.Therefore,the fine-scale characterization of the planar distribution of natural fractures is crucial to deep CBM production.[Object-ives and Methods]This study investigated the No.8 coal seam in the Carboniferous Benxi Formation within the Daning-Jixian block on the eastern margin of the Ordos Basin.Through offset vector tiles(OVT)domain processing of offshore 3D wide-azimuth,broadband,and high-density(WBH)seismic data,this study determined five-dimensional seismic data:time,space(3D coordinates),offset(or shot-to-geophone distance),and azimuth.Then,fracture prediction was conducted through a pre-stack analysis of the azimuthal anisotropy attributes.[Results and Conclusions]this study de-veloped a technical process for the five-dimensional seismic data-based interpretation that combined the methods of el-liptical fitting and azimuthal statistics.The results reveal the presence of conjugate fracture systems in the study area:Yanshanian nearly EW/NEE-and Himalayan nearly SN/NNE-oriented fractures.The verification using multi-source data,including formation micro-imaging(FMI)logs,array acoustic logs,and fracturing curves,indicates that the azi-muthal statistical method exhibited higher reliability in predicting fracture orientation(coincidence rate:89％)and de-velopmental degree(prediction accuracy:88.5％).The results of this study have provided successful guidance for the optimization of horizontal well deployment,providing significant technical support for the efficient development of deep CBM.The relevant methodology can be widely applied to other basins bearing deep coal-bearing gas.关键词
深部煤层气/天然裂缝/"两宽一高"地震/地震属性/OVT技术/鄂尔多斯盆地/大宁-吉县Key words
deep coalbed methane(CBM)/natural fracture/wide azimuth,broadband,and high-density(WBH)seismic data/seismic attribute/offset vector tiles(OVT)technique/Ordos Basin/Daning-Jixian block分类
天文与地球科学引用本文复制引用
童姜楠,王峰,张枫,侯伟,李忠百,季亮,姜亚南,孙伟..五维地震属性在鄂尔多斯盆地东缘深部煤层气天然裂缝预测中的应用[J].煤田地质与勘探,2025,53(4):222-234,13.基金项目
中国石油天然气股份有限公司"十四五"攻关性应用性项目(2023ZZ18-02) （2023ZZ18-02）
