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Meso-Cenozoic negative inversion model for the Linhe Depression of Hetao Basin, China

Published online by Cambridge University Press:  01 December 2021

Fusheng Yu*
Affiliation:
State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing, China Department of Earth Sciences, China University of Petroleum (Beijing), Beijing, China
Ruifeng Zhang
Affiliation:
Exploration Department of Huabei Oilfield Company, PetroChina, Renqiu, China
Jiafu Yu
Affiliation:
Department of Earth Sciences, China University of Petroleum (Beijing), Beijing, China
Yidan Wang
Affiliation:
Department of Earth Sciences, China University of Petroleum (Beijing), Beijing, China
Shuguang Chen
Affiliation:
Exploration Department of Huabei Oilfield Company, PetroChina, Renqiu, China
Jing Liu
Affiliation:
Exploration Department of Huabei Oilfield Company, PetroChina, Renqiu, China
Chenlin Wu
Affiliation:
Exploration Department of Huabei Oilfield Company, PetroChina, Renqiu, China
Yiqun Wang
Affiliation:
Exploration Department of Huabei Oilfield Company, PetroChina, Renqiu, China
Shaochun Wang
Affiliation:
Exploration Department of Huabei Oilfield Company, PetroChina, Renqiu, China
Yuheng Wang
Affiliation:
Department of Earth Sciences, China University of Petroleum (Beijing), Beijing, China
Yilun Liu
Affiliation:
Department of Earth Sciences, China University of Petroleum (Beijing), Beijing, China
*
Author for correspondence: Fusheng Yu, Email: [email protected]

Abstract

The Linhe Depression is the largest tectonic unit in the Hetao Basin. The recently discovered commercial oil flow in the structural trap of wells JH2X and S5 has proved that the Meso-Cenozoic strata in the Linhe Depression have great exploration potential. Research on the kinematic model for the Mesozoic–Cenozoic Linhe Depression is important for analysing the geological conditions of hydrocarbon accumulation. In this study, field observations, seismic interpretation and scaled analogue modelling are performed. The results prove that the Linhe Depression experienced different stages of tectonic evolution, such as compressional depression (K1l), conversion from contraction to uniform subsidence (K1g), extensional rifting (E2–N2) and strike-slip deformation (Q), during the Mesozoic–Cenozoic eras. The kinematic model of negative inverted basins was first established with the early differential compression superimposed by the late extension. The seismic interpretation and analogue modelling results show that Jilantai Sag in the southern part of the Linhe Depression was subjected to compression from the Bayanwulashan fold–thrust belt on the NW side and the Helanshan fold–thrust belt on the SE side during Early Cretaceous time. Meanwhile, the Hanghou Sag in the northern part of the Linhe Depression was only compressed by the Langshan fold–thrust belt from the NW direction. The rifted structure generated by the extension from the SE direction during the Cenozoic Era resulted in the negative inversion of the pre-existing thrusts in different patterns. The intensity of negative inversion is controlled by several key factors, such as dip angle and the patterns of thrust faults, along with different basement textures. The morphological changes in the forebulge zone developed during Early Cretaceous time are responsible for the development of the segmented Central fault zones in the Hanghou Sag.

Type
Original Article
Copyright
© The Author(s), 2021. Published by Cambridge University Press

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