近日，西北大学黄雷团队研究了鄂尔多斯盆地走滑断裂垂向分层发育模式及其意义。该成果于2025年4月16日发表在《中国科学：地球科学》杂志上。

对克拉通盆地内走滑断裂的研究显示出明显的垂向分层，与构造活动区的大规模走滑断裂形成鲜明对比。这一现象的潜在主题和地质含义仍然没有得到充分的了解。利用高分辨率三维地震资料，研究组分析了鄂尔多斯盆地走滑断裂的垂向分层特征，探讨了走滑断裂的表现形式、控制因素、发育模式及其地质意义。

结果表明，鄂尔多斯盆地垂向分层主要表现为ENE、NW、NNE（近北向南）向断裂的叠加，以及单个断裂的分层；前者表现为一个断层群主导的共轭断层系统，后者表现为多个重叠的花状结构，具有多相运动过渡。

这种分层是多期断裂活动的结果，反映了稳定克拉通地区在水平构造应力作用下，脆性断裂在浅部变形成核和传播的趋势。圈定的克拉通走滑断裂“分层-多阶段-浅成核”发育模式有效地记录了区域构造应力场的多阶段变化，影响了层状油气分布。这一模式为研究稳定区的陆内构造变形机制和地震活动提供了新的认识。

附：英文原文

Title: Development model of vertical stratification for the strike-slip fault in the Ordos Basin and its significance

Author: Lei HUANG, Chiyang LIU, Yongtao LIU, Yijun ZHOU, Faqi HE, Zhao WANG, Yiyong ZHANG, Binhua GUO, Chao LIANG

Issue&Volume: 2025/04/16

Abstract: Investigations of strike-slip faults within cratonic basins reveal distinct vertical stratification, contrasting markedly with large-scale strike-slip faults in tectonically active regions. The underlying causes and geological implications of this phenomenon remain inadequately understood. This study employs high-resolution 3D seismic data to analyze the vertical stratification of strike-slip faults in the Ordos Basin, focusing on their manifestations, controlling factors, developmental patterns, and geological significance. Results indicate that vertical stratification in the Ordos Basin is characterized by the superposition of faults with ENE, NW, and NNE (near N-S) orientations, as well as the stratification of individual faults. The former exhibits a conjugate fault system dominated by one fault group, while the latter features multiple superimposed flower structures with multiphase kinematic transitions. This stratification results from multiphase fault activity, reflecting the tendency of brittle fault deformation to nucleate and propagate at shallow depths under horizontal tectonic stress in stable cratonic regions. The identified “stratification-multistage-shallow nucleation” developmental pattern of cratonic strike-slip faults effectively records multistage changes in the regional tectonic stress field and influences stratified hydrocarbon distribution. This pattern provides new insights into intracontinental tectonic deformation mechanisms and seismic activity in stable regions.

DOI: 10.1007/s11430-024-1541-9

Source: https://www.sciengine.com/SCES/doi/10.1007/s11430-024-1541-9