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当阳复向斜页岩气探测区地壳结构及其构造暗示

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  • 万方数据
  • 维普
本文采用接收函数H-κ叠加、多频接收函数和面波联合反演方法,获得了扬子克拉通当阳复向斜区21个密集流动地震台下方的地壳厚度、Vp/Vs比和S波速度.结果表明,该区平均地壳厚度和Vp/Vs比值分别为33.8 km和1.75,推测当阳复向斜经历过下地壳减薄但地壳整体尚保持典型克拉通结构特征.研究区绝大部分台站都在3～4km深度存在1～2 km厚的低S波速度层,推测可能与该深度范围内富集高孔隙度和低密度的页岩气层有关.本研究表明,基于密集流动地震台阵被动源数据资料,可为油气资源勘探提供有价值的参考.
Crustal structure in the Dangyang Synclinorium shale gas field and its tectonic implications
In this paper,the crustal thickness,Vp/Vs ratio and S-wave velocity beneath 21 temporary seismic stations deployed in the Dangyang Synclinorium of the Yangtze Craton were obtained using the H-κ stacking method of receiver function and joint inversion of multifrequency receiver function and surface wave dispersion.An average crustal thickness of 33.8 km and average Vp/Vs ratio of 1.75 were obtained in the Dangyang Synclinorium,suggesting that it has experienced thinning of the lower crust,but the body of crust still maintains typical cratonic structure.1～2 km-thick low-velocity layer at depths of 3～4 km was imaged beneath most stations,which may be related to the enrichment of shale gas strata with high porosity and low density within the depth range.Our study suggests that passive source data from dense temporary seismic stations can provide valuable references for oil-gas exploration.

Dangyang SynclinoriumShale gas explorationLow-velocity thin layerJoint inversion of receiver function and surface wave dispersionH-κ stacking method of receiver function

危自根、储日升、谢军、范心甜

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中国科学院精密测量科学与技术创新研究院,大地测量与地球动力学国家重点实验室,武汉 430077

当阳复向斜 页岩气勘探 低速薄层 接收函数和面波联合反演 接收函数H-κ叠加

国家自然科学基金国家自然科学基金湖北省自然科学基金中国科学院战略先导科技专项中国科学院战略先导科技专项

42325401U20A20952023AFB1076XDB41020202XDB18010304

2024

10.6038/cjg2023R0015

地球物理学报
中国地球物理学会 中国科学院地质与地球物理研究所

地球物理学报

CSTPCD北大核心
影响因子：3.703
ISSN：0001-5733
年,卷(期)：2024.67(8)