Piedmont nappe belt volcanic rock region reverse fault subdivision vertical carrying capability evaluation method

Abstract

The invention provides a piedmont nappe belt volcanic rock region reverse fault subdivision vertical carrying capability evaluation method. The method comprises steps that a fractured zone structure geologic model, a fractured zone structure layer permeability and effective stress relation model, a fractured zone structure layer geometric relation model, a fractured zone permeability evaluation model, a fractured zone permeability correction factor mathematical model are established; a fault carrying capability evaluation profile is selected in an optimized way; a fault subdivision vertical carrying quantitative evaluation model is established; and a fault carrying quantitative evaluation index threshold value is determined. The reverse fault subdivision vertical carrying capability evaluation method is advantageous in that the three-dimensional quantitative evaluation of the fracture carrying capability of the brittle stratum development region of the volcanic rock is realized, and the fault carrying capability quantitative evaluation method is enriched; the method can be widely used for the reverse fault carrying performance evaluation of the compressional basin piedmont nappe belt volcanic rock region, and therefore an important guiding significance is provided for oil and gas exploration.

Description

Technical field [0001] The invention belongs to the technical field of oil and gas geological exploration, and specifically relates to a quantitative evaluation method for the vertical conduction capacity of reverse fault subunits in the volcanic rock area of ​​the nappe belt. Background technique [0002] Exploration confirmed that faults are the main channel for oil and gas migration from deep source rocks to shallow reservoirs. In the piedmont zone of a compressive torsion basin, the formation and distribution of oil and gas reservoirs are more obviously controlled by faults: on the plane, the oil and gas are distributed near the fault zone, and in the vertical direction, there is three-dimensional oil-bearing along the fault. In-depth study of the transport capacity of faults is of great significance for revealing the mechanism and process of oil and gas accumulation and summarizing the law of oil and gas distribution. [0003] The key to the evaluation of fracture transport c...

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Problems solved by technology

Affected by multi-stage thrust-nappe orogeny, the structural deformation of the piedmont zone is strong, and the volcanic strata in the nappe zone are often widely developed. The conventional evaluation method for the opening and closing of faults is not applicable. A mature and suitable method for complex mountains has not yet been proposed. Quantitative evaluation methods for fault transport capacity in forezone volcanic rock areas, it is urgent to explore applicable evaluation methods to deepen the understanding of oil and gas accumulation laws in volcanic rock areas

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