0 引言
1 研究区地质概况
2 地层剥蚀量计算
3 地层压实校正计算
4 构造平衡剖面分析
图6 构造平横剖面恢复过程示意Fig.6 Schematic diagram of the restoration process of constructing a horizontal cross-section |
Restoration of ancient structures in complex fault areas of faulted basins: Taking the lower section of the fourth member of Shahejie Formation in the Bonan Sag of Jiyang Depression of Bohai Bay Basin as an example
Received date: 2023-10-28
Revised date: 2024-04-16
Online published: 2024-06-19
Supported by
The China National Science and Technology Major Project(2016ZX05006)
The study of ancient structures is important for oil and gas exploration and development, as it plays a controlling role in the development characteristics of oil and gas reservoirs, hydrocarbon generation, and reservoir formation. However, the extensive development of normal faults in complex fault areas of faulted basins increases the difficulty of three-dimensional ancient structure restoration. There are still certain problems in the study of ancient structures in faulted basins, such as the restoration of erosion, fault removal, and compaction correction. In response to the strong heterogeneity of the target layer in the research area and the poor effectiveness of existing porosity recovery and compaction correction methods due to the complex relationship between porosity and depth, this study uses methods such as stratigraphic compaction correction, layer flattening ancient structure recovery, 3D mapping, etc. to study the ancient structure recovery of the lower section of the fourth member of Shahejie Formation (Es 4 x) in the Bonan Sag of Jiyang Depression, Bohai Bay Basin. This study innovatively introduces density logging (DEN) data and proposes a new approach for compaction correction research using the principle of conservation of formation materials; and based on the layer flattening ancient structure restoration method, the thickness of the strata is obtained through research such as fault removal and apparent thickness restoration. The original thickness of the strata is obtained using methods such as erosion amount, compaction correction, and structural equilibrium profile analysis. Finally, a 3D mapping software is used to compile a three-dimensional spatial morphology map of the ancient structure. The new ancient structure map can more accurately reflect the geomorphic characteristics of the sedimentation under the fourth sand layer. Thus, a three-dimensional spatial paleotectonic restoration method suitable for complex fault zones in faulted basins was proposed.
Pengfei ZHANG , Jinhua LIU , Tao MENG , Chao JIANG , Pai PENG . Restoration of ancient structures in complex fault areas of faulted basins: Taking the lower section of the fourth member of Shahejie Formation in the Bonan Sag of Jiyang Depression of Bohai Bay Basin as an example[J]. Natural Gas Geoscience, 2024 , 35(11) : 1973 -1982 . DOI: 10.11764/j.issn.1672-1926.2024.04.017
图6 构造平横剖面恢复过程示意Fig.6 Schematic diagram of the restoration process of constructing a horizontal cross-section |
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