Method for quantitative description of strike-slip displacement of fault in extension environment

A fault and displacement technology, applied in the field of geological exploration, can solve problems such as the inability to quantitatively describe the strike-slip displacement of faults, and achieve the effects of high accuracy, clear identification, and simple steps

Inactive Publication Date: 2017-04-05
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

[0005] Aiming at the technical problem that the above-mentioned existing fault strike-slip analysis method cannot quantitatively describe the fault strike-slip displacement, the present invention proposes a method fo

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  • Method for quantitative description of strike-slip displacement of fault in extension environment
  • Method for quantitative description of strike-slip displacement of fault in extension environment
  • Method for quantitative description of strike-slip displacement of fault in extension environment

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Embodiment 1

[0040] In the western margin of the Qingtuozi Uplift, Dongying Sag, Bohai Bay Basin, due to its proximity to the uplift, many strata are undeveloped or eroded, such as image 3 As shown, the strata developed in this area from deep to shallow mainly include Sinian (basement), Shahejie Sisha Formation (referred to as Shasi Formation), Shahejie Sansha Formation (abbreviated as Sha3 Formation), Guantao Formation, Minghua Formation Town group, fourth department. With the development of the Dongying Movement, the Sha 3 Formation and Sha 4 Formation were in direct contact with the overlying Guantao Formation, forming a large-scale angular unconformity. The normal faults in this area are frequently active, and it is difficult to identify the strike-slip action of the faults. Therefore, , select the Sha3 Formation and Guantao Formation strata in the west margin of the Qingtuozi Uplift in the Dongying Sag, Bohai Bay Basin as the study area, and quantitatively describe the strike-slip di...

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Abstract

The invention, which belongs to the technical field of geological prospecting, provides a method for quantitative description of strike-slip displacement of a fault in an extension environment. With the method provided by the invention, quantitative description of strike-slip displacement values of a fault at different geological historic periods can be realized. The method comprises the following steps: selecting a research area, calibrating a position based on geological data and carrying out position explanation, identifying a fault according to a seismic response characteristi8c of the fault, screening normal slip faults out, and carrying out normal slip fault explanation by using a plurality of fault points at different seismic sections; carrying out meshing processing on the data of a plurality of fault points corresponding to the same normal slip fault to obtain a three-dimensional curved surface and combining the three-dimensional curved surface of a plurality of normal slip faults to form a normal-slip-fault three-dimensional model; and scanning the stratum of the research area layer by layer to obtain horizontal slices, superposing the horizontal slices with the normal-slip-fault three-dimensional model to obtain a slice combination graph, selecting the normal slip faults with seismic diastrophism at the stratum at two sides of the fault in the slice combination graph, and using seismic diastrophism displacement values of the stratum at two sides of the fault for representing the strike-slip displacement value of the fault.

Description

technical field [0001] The invention belongs to the technical field of geological exploration, in particular to a method for quantitatively describing the strike-slip displacement of a fault in a tensional environment. Background technique [0002] A fault is a structure formed when the crust is fractured by force and the rock blocks on both sides have a significant relative displacement along the rupture surface. Among them, the fault in which the hanging wall is relatively lowered and the footwall is relatively raised is called a normal fault. In continental faulted basins, most of the normal faults developed and formed in the extensional environment can play key roles such as basin control, circle control, and reservoir control. Characterization is a non-negligible part in the analysis of basin structural characteristics and structural evolution. However, due to the strong concealment of the strike-slip effect of faults, it is difficult to explain and analyze. [0003] ...

Claims

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Application Information

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IPC IPC(8): G01V1/30
CPCG01V1/302G01V2210/624G01V2210/74
Inventor 蒋有录王宇刘华吕雪莹信凤龙
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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