Seismic interpretation and structural analysis of a rifted thrust belt: Jianghan Basin, China

1997 ◽  
Vol 16 (8) ◽  
pp. 1177-1183 ◽  
Author(s):  
Richard W. Wiener ◽  
James A. Helwig ◽  
Jiang Rongpei
Keyword(s):  
Structural Analysis ◽  
Seismic Interpretation ◽  
Thrust Belt ◽  
Jianghan Basin

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

2021 ◽  
pp. 1-26
Author(s):  
Fusheng Yu ◽  
Ruifeng Zhang ◽  
Jiafu Yu ◽  
Yidan Wang ◽  
Shuguang Chen ◽  
...  
Keyword(s):  
Early Cretaceous ◽  
Morphological Changes ◽  
Kinematic Model ◽  
Seismic Interpretation ◽  
Thrust Belt ◽  
Key Factors ◽  
Analogue Modelling ◽  
Geological Conditions ◽  
Oil Flow ◽  
Dip Angle

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.

Improving 2D seismic interpretation in challenging settings by integration of restoration techniques: A case study from the Jura fold-and-thrust belt (Switzerland)

2015 ◽  
Vol 3 (4) ◽  
pp. SAA37-SAA58 ◽  
Author(s):  
Alexander Malz ◽  
Herfried Madritsch ◽  
Jonas Kley
Keyword(s):  
Cross Section ◽  
Lower Triassic ◽  
Seismic Profile ◽  
Seismic Interpretation ◽  
Mountain Range ◽  
Thrust Belt ◽  
Jura Mountains ◽  
Northern Switzerland ◽  
Fold And Thrust Belt

The structural geologic interpretation of reflection seismic data is affected by conceptual uncertainty, particularly in challenging onshore settings. This uncertainty can be significantly reduced by the integration of cross-section restoration and balancing techniques into the seismic interpretation workflow. Moreover, these techniques define a solid and comprehensive basis, grounding the interpretation and allowing a closer investigation of the deformation history that led to the interpreted structures. These benefits are demonstrated on the basis of a case study from the eastern Jura Mountains in northern Switzerland. This mountain range was formed by a thin-skinned foreland fold-and-thrust belt with a multiphase prethrusting tectonic history. Despite significant seismic acquisition and processing efforts, seismic imaging of the strongly deformed parts of the belt widely remains ambiguous. We have developed a detailed systematic interpretation workflow that is exemplified here for a single seismic profile across the Jura Main Thrust. Classical cross-section balancing techniques of equal bed lengths and areas were applied to validate and reinterpret the given seismic interpretation. Our results suggest that most of the observed structures resulted from thin-skinned deformation along a basal décollement in Lower Triassic evaporites, which is generally inferred for the Jura Mountains. Nevertheless, secondary detachment levels in above lying strata have to be considered as well. The stepwise restoration of the analyzed cross section points toward different styles of thin-skinned deformation and possibly several episodes of earlier basement-rooted faulting events, which are indicated by subtle stratigraphic thickness changes. In summary, our workflow allowed us to significantly improve the original seismic interpretation, highlight specific deformation styles, and illuminate possible prethrusting deformation events that would otherwise be easily overlooked.

scholarly journals Structural analysis of two juxtaposed Jurassic lithostratigraphic assemblages in the Sierra Madre Oriental fold and thrust belt of central Mexico

1989 ◽  
Vol 28 (5) ◽  
pp. 1007-1028
Author(s):  
M. Carrillo-Martinez
Keyword(s):  
Structural Analysis ◽  
Central Mexico ◽  
Thrust Belt ◽  
Sierra Madre Occidental ◽  
Sierra Madre Oriental ◽  
Fold And Thrust Belt ◽  
Sierra Madre ◽  
Cretácico Inferior

Una comparación general de tres áreas vecinas en la Sierra Madre Occidental en el cetro de México sugiere la existencia de una corteza continental mesozoica bordeada por una zona de subducción. Al oriente de la Cabalgadura de Higuerillas afloran 2400-3500 m de espesor de depósitos marinos compuestos de (1) calizas arcillosas y lutitas depositadas durante el Jurásico Superios-Neocomiano;(2) calizas de la parte superior del Cretácico Inferior y (3) rocas pelíticas del Cretacico Superior. Al oeste de la Cabalgadura de Higuerillas, dos conjuntos litotectónicos se encuentran yuxtapuestos: el más occidental contiene en su parte inferior intercalaciones de grauvaca micácea de grano fino con lutita filitzada, rocas voclano-sedimentarias y pedernales con radiolarios, relacionadas con un arco magmático. La edad de estas litologías puede pertenecer al Jurásico Medio o al Jurásico Superior. Sobre estas rocas descansan, separadas por una dicordia angular, conglomerado, caliza marina de batimetría moderada, arenisca, lutita y capas rojas de edad neocomiana. El conjunto oriental consiste en brecha, conglomerado, piroclastos de composición ácida y otras rocas siliciclásticas depositadas durante el Kimeridgiano Superior hasta el Titoniano Inferior. Las rocas siliclásticas de grano grueso se depositaron probablemente cuando la anterior plataforma continental Norteamericana se deformó por fallamiento normal de alto ángulo, que estuvo activo aún en el Neocomiano - Barremiano y que pudo ser responsable del profundizamiento de la plataforma donde se depositaron las series litológicas de ese período. Los afloramientos jurasicos situados más al oeste de la Cabalgadura de Higuerillas incluyen grauvaca, toba y pedernales con radiolarios, fracturados y desgarrados in situ en una matriz arcillosa y que exhiben con frecuencia un crucero penetrativo que se inclina de a 40° hacia el SW. Este tipo de deformación esta casi ausente en las rocas siliciclásticas de grano grueso situadas al oriente. El límite entre estos dos conjuntos litotectónicos está definido por el lineamiento que aquí se domina El Frontón, como una zona de lentes de cizallamientos por fallamiento inverso imbricado.

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