Calculation method for slip displacement of strike-slip zone of goose column type normal fault

Abstract

According to the method for calculating the slip displacement amount of the strike-slip zone of the goose column type normal fault. Drilling data and logging data are combined, horizon calibration and horizon interpretation are carried out on seismic data to obtain a primary calibration seismic profile map, and according to the primary calibration seismic profile map and a horizon coherence body attribute map, mutual verification is carried out to obtain a fine strike-slip zone plane distribution map and a fine calibration seismic profile map of a sedimentary stratum, then the strike-slip zone trend, the strike-slip fault trend and the horizontal fault amount Li of the strike-slip fault in the active period along the tendency are determined by combining the fine strike-slip zone plane distribution map and the fine calibration seismic profile map, and finally the strike-slip displacement amount sigma (Li / sin alpha) of the strike-slip zone of the normal fault is obtained. Under the condition that a research area lacks obvious two-disc markers or lacks a tail-end broom-shaped fault, quantitative characterization of strike-slip displacement of the strike-slip zone can also be carried out, the defects of methods such as obvious staggered markers and tail-end broom-shaped fault are overcome, and quantitative research on activity of underground cases of the goose column type strike-slip zone is effectively promoted.

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

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