天然气工业2026，Vol.46Issue(4)：61-71,11.DOI:10.3787/j.issn.1000-0976.2026.04.005
煤岩气地质-工程甜点要素地震表征与预测
Seismic characterization and prediction of geological and engineering sweet spot elements for coal-rock gas:A case study of the Yichuan area in the Ordos Basin
摘要
Abstract
There are abundant coal-rock gas resources in China,but their exploration faces the difficulties like low accuracy of conventional seismic prediction and unclear geophysical characterization of sweet spot elements,which restricts the efficient development of coal-rock gas.Taking the Yichuan area of the Ordos Basin as an example,this paper innovatively establishes a seismic quantitative characterization method for geological and engineering parameters of thin coal seams and constructs a multi-element collaborative prediction technology system for sweet spots of coal-rock gas by using logging,"broadband,wide-azimuth,high-density,high-fidelity"3D seismic,fracturing engineering,and production test data comprehensively.The following results are obtained.First,the elastic parameters are calculated by virtue of the multi-level facies-controlled pre-stack geostatistical inversion under constraint of petrophysical analysis,and a quantitative relationship model is established based on the logging evaluation results.In this way,the spatial distribution and gas content of thin coal seams can be predicted effectively.Second,regarding the strong reservoir heterogeneity,dual porosity,and coexisting free and adsorbed gas in coal-rock gas reservoirs,a geological sweet spot characterization factor based on coal thickness and gas content is innovatively proposed,which enables the distribution prediction of geological sweet spots.Third,the application of facies-controlled pre-stack geostatistical inversion and pre-stack anisotropic inversion technologies promotes the quantitative evaluation of key engineering parameters,such as horizontal principal stress difference and fracture development intensity in coal seams.Fourth,it is indicated that fracture development intensity and horizontal principal stress difference are the main factors controlling engineering sweet spots,and the engineering sweet spot characterization factor constructed on the basis of multiple regression enables the prediction of engineering sweet spots.In conclusion,the research results play a crucial role in target selection,horizontal well deployment and implementation,and fracturing scheme design.They have contributed to the submission of proven geological reserves of coal-rock gas exceeding 100 billion cubic meters in the Yichuan area,providing technical reference and guidance for coal-rock gas exploration and development under similar geological conditions.关键词
鄂尔多斯盆地/煤岩气/地质-工程甜点/含气量预测/水平主应力差/裂缝预测Key words
Ordos Basin/Coal-rock gas/Geological and engineering sweet spots/Gas content prediction/Horizontal stress difference/Fracture prediction分类
天文与地球科学引用本文复制引用
户昶昊,朱再文,郭嘉丽,刘兴周,董德胜,牟春,徐振旺,孙转,张仟策,毕二刚,迟润龙..煤岩气地质-工程甜点要素地震表征与预测[J].天然气工业,2026,46(4):61-71,11.基金项目
中国石油天然气股份有限公司辽河油田分公司重大科技专项项目"复杂目标区地震勘探关键技术研究"(编号:2023KJZX-01). （编号:2023KJZX-01）
