A Planar Representation Method of Torsional Structure

Abstract

The invention provides a planar representation method for transtension structures. The planar representation method comprises planar representation of the two-plate position, fault direction reversing, a relative motion direction of a single transtension fault, and a transtension ridge, a transtension groove and the combination pattern thereof formed by ground deformation and visually displays the two-plate position, fault direction reversing, the relative movement direction, the deformation characteristics of the stratum and the plane combination pattern. The invention can describe the basic geological characteristics of the transtension structure by two-dimensional graphics, and reflect the kinematic characteristics of the active plate, the relative movement direction, and the deformation characteristics easily neglected in the study; compared with the traditional extensional structure, the expression of strike slip structure is easier to distinguish and the characterization of transtension structures is more comprehensive, more reasonable and more systematic; the sketch map of the study area is more abundant in static information and the kinematics information is more reasonable; the expression of strike slip structure is beneficial to comprehensive and systematic understanding and expression of regional tectonic stress field.

Description

technical field [0001] The invention relates to the technical field of geophysical exploration data processing, in particular to a plane representation method of torsional structures. Background technique [0002] The torsional structure has the mechanical characteristics of tension and torsion, which is the result of the joint action of extension and strike-slip, and is an important manifestation of the horizontal movement of the crust. Because the continent and continental shelf in eastern China were affected by subduction and collision of the Kura-Pacific and Indian Ocean plates in different tectonic movements at different times, twisting factors were injected into the various extensional structural styles formed in the oil-gas-bearing basins in eastern China. A series of torsional structures are formed. Scholars at home and abroad have studied the discovered oil and gas reservoirs of twisted structures, and the results show that twisted structures affect the provenance ...

AI Technical Summary

Problems solved by technology

[0003] At present, the research on torsional structure mostly adopts the method similar to the analysis of tensional structure, and the expression of the planar characteristics of torsional fault mainly adopts the illustration of normal fault or translational fault, which is untargeted and intuitive to the particularity of torsional fault. However, the systematic characterization method often cannot be distinguished from the normal fault formed by extension in the structural map, which affects the intuitive interpretation of the structural map and the analysis of the characteristics of the tectonic stress field.

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