Method for calculating the strike-slip displacement based on strike-slip fault in the context of multi-phase tectogenesis

Abstract

The invention discloses a method for calculating the strike-slip displacement based on a strike-slip fault in the context of multi-phase tectogenesis, wherein the method comprises: determining a maintectonic axis; measuring the deformation Lupi, Lupi', Ldowni, and Ldowni' of the left and right plate basements of the i-th group of fault of the strike-slip fault involved in the top and bottom plates of thrust tectonics; measuring the deformation Mi and Mi' of the left and right plate detachment faults of the i-th group of faults of the strike-slip fault; calculating the included angles [phi]si,[phi]si, [phi]xi and [phi]si' between the top and bottom plate tectonic lines of the left and right plate basements of the i-th group of fault of the strike-slip fault and a main slip band, and the included angles [phi]Mi and [phi]Mi' between the upper overlaying detachment layer tectonic lines of the left and right plates of the i-th fault of the upper overlying strike-slip fracture and the mainslip band, and calculating the components of the Lupi, Lupi', Ldowni, Ldowni', Mi, and Mi' in the main slip band; and calculating the strike-slip displacement of the strike-slip fault according to the above components. The method can calculate the strike-slip displacement of the strike-slip fault in the context of multi-phase tectogenesis, and provides reference for follow-up development drillingand reserve scale evaluation.

Description

technical field [0001] The embodiment of the present application relates to the technical field of geological exploration, and specifically relates to a calculation method of strike-slip displacement based on strike-slip faults under the background of multi-phase tectonic activities. Background technique [0002] In recent years, with the continuous improvement of drilling results along the strike-slip fault zone in the Tarim Basin, especially the continuous breakthrough of the Shunbei series of wells drilled along the northeast strike-slip fault in the Shunbei area of ​​the basin, and the drilling of wells at different strength levels The difference in production capacity further confirms that strike-slip faults in the region play an important role in controlling the formation and transformation of deep karst fracture-vuggy reservoirs and oil and gas migration and accumulation, so it is more important to increase the identification and strength division of strike-slip faults...

AI Technical Summary

Problems solved by technology

In addition, according to the principle of area conservation of thrust double structures on the profile, the method of estimating the strike-slip distance on the plane of the tearing fault (shortening distance of extrusion) not only ignores the lateral expansion of structural deformation, but also does not consider the slippage of the caprock. , Denudation and its impact on disk thrust component

[0008] 4. Calculate the strike-slip amount by using the displacement changes of special geological bodies (earthquake abnormal reflectors, faults cut by strike-slip, etc.) on the two plates of the strike-slip fault. It is difficult to find special geological bodies that can be used as identification marks for the displacement of strike-slip faults on the profile, and even if there are special geological bodies, it can only characterize the internal strike-slip amount of a certain caprock, and it is impossible to characterize the strike-slip faults as a whole vertically and horizontally. To characterize the activity, and to select different geological bodies for comparison and reference often lead to different results, which cannot meet the requirements of fine characterization

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