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Deformation mechanism and hydrocarbon significance of Eocene organic-rich fine-grained soft sediments in the Leijia Region, Liaohe Depression

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Abstract

The deformation structure of soft sediments has always been a research hotspot, which is of great significance for analyzing the tectonic and sedimentary evolution background of a basin, as well as the physical properties of reservoirs. Previous studies have reported that a large number of soft sediment deformation structures are developed in the western part of Liaohe depression. In this study, through core observation and thin section identification, various types of deformation structures are identified in the core samples which are collected from the upper Es4 in the Leijia region, western sag of Liaohe depression, such as liquefied dikes, liquefied breccia, convoluted laminae, annular bedding, synsedimentary faults, vein structures, etc. Based on the characteristics of core structure, single well profile and continuous well profile, combined with the regional background, this study clarifies that the deformation structure of soft sediments in the study area is mainly caused by seismic action. It is found that the permeability and porosity of deformation layers in the study area are higher than those of the undeformation layers, which proves that the deformation structure of soft sediments has a good effect on improving the physical properties of reservoirs.

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Acknowledgments

This study was funded by the National Natural Science Foundation “Event Sedimentation in Lacustrine Organic-Rich Mudrock: Taking the Chang 7–8 Member of the Ordos Basin as an Example” (Grant No. 41802130). We thank the Liaohe Oilfield Research Institute for allowing us to access their core samples and well data. We greatly appreciate each reviewer’s critical comments and helpful suggestions, which greatly contributed to the improvement of the paper.

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Authors and Affiliations

  1. School of Energy Resources, China University of Geosciences (Beijing), Beijing, 100083, China

    Yijie Wen, Jianguo Zhang & Shu Tao

  2. Key Laboratory of Strategy Evaluation for Shale Gas (Ministry of Land Resources), China University of Geosciences (Beijing), Beijing, 100083, China

    Jianguo Zhang & Shu Tao

  3. School of Foreign Languages, China University of Geosciences (Beijing), Beijing, 100083, China

    Chenyu Cai

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  1. Yijie Wen
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Correspondence to Jianguo Zhang.

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Wen, Y., Zhang, J., Tao, S. et al. Deformation mechanism and hydrocarbon significance of Eocene organic-rich fine-grained soft sediments in the Leijia Region, Liaohe Depression. Front. Earth Sci. (2023). https://doi.org/10.1007/s11707-022-1065-3

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