A Calculation Method of Strike-Slip Displacement in the Strike-Slip Zone of En-Echelon Normal Fault

Abstract

The method for calculating the strike-slip displacement of the echelon normal fault strike-slip zone according to the present invention combines drilling data and well logging data to perform horizon calibration and horizon interpretation on seismic data to obtain a primary calibration seismic profile, according to Preliminary calibration of the seismic section map and the property map of the coherent body along the layer to confirm each other to obtain the fine strike-slip zone plane distribution map and the fine calibration seismic section map of the sedimentary strata, and then combine the fine strike-slip zone plane distribution map and the fine calibration seismic section , determine the strike-slip zone strike, strike-slip fault strike, and the horizontal offset Li of the strike-slip fault along the dip during the active period, and finally obtain the strike-slip displacement of the normal fault strike-slip zone as Σ(Li / sinα). In the absence of obvious two-plate markers or lack of broom-like faults at the end of the study area, quantitative characterization of the strike-slip displacement of the strike-slip zone can also be performed to compensate for the obvious dislocation markers and broom-like faults at the end. In order to effectively promote the quantitative research on the activity of subsurface cases in the echelon strike-slip zone.

Description

technical field [0001] The invention belongs to the technical field of structural geological exploration, and in particular relates to a method for calculating the strike-slip displacement of an echelon normal fault strike-slip zone. Background technique [0002] With the major oil and gas breakthrough in the northward strike-slip zone in the Tarim Basin, geologists gradually realized the importance of the strike-slip zone inside the basin. Usually, the strike-slip displacement of the strike-slip fault zone inside the basin (referred to as the strike-slip zone) does not exceed several thousand meters, and the strike-slip zone is an underground structural style with complex structures. No matter in the early or late stage of strike-slip zone activity, echelon strike-slip faults will appear in the strike-slip zone. [0003] The echelon normal fault strike-slip zone refers to the strike-slip shear fault zone composed of echelon normal faults, specifically, each strike-slip fau...

AI Technical Summary

Problems solved by technology

This method has the following limitations: This method requires obvious markers on the two sides of the fault to calculate the strike-slip displacement. There is no corresponding marker, that is, there is no condition to use the above method to calculate the strike-slip displacement of the echelon strike-slip zone

However, this method is suitable for large-scale strike-slip faults with tail-end broom-shaped branch faults, but for small-scale strike-slip faults in basins without tail-end broom-like strike-slip faults, this method is not suitable for echelon analysis. Conditions for Calculation of Strike-slip Displacement of Formula Strike-slip Zone

[0009] Therefore, due to the small strike-slip displacement of strike-slip faults in the basin, the low quality and accuracy of seismic data, and the lack of relative markers, the study on the activity of subsurface cases of echelon strike-slip zones, especially the quantitative characterization of strike-slip displacement It is a technical difficulty that has not been overcome in this field

Images