Seismic fine depiction method for compact oil and gas storage and seepage body

Abstract

The invention discloses a compact oil and gas storage and seepage body seismic fine description method. The method comprises steps of carrying out reservoir inversion and inversion effect analysis according to the characteristics of compact oil and gas geology and geophysics, based on the post-stack time migration seismic data, and through the optimization of an inversion method test; according to a reservoir inversion result, calculating to obtain an energy storage coefficient; according to the method, difficulty that the fractured reservoir is difficult to describe comprehensively due to different dimensions of different seismic attributes being overcome, and for different-scale faults and fracture prediction methods and parameters, information representing fractures, fractures and fracture zone ranges being added after the dimensions are unified to obtain a fracture comprehensive evaluation body; and carrying out attribute fusion on the representation reservoir and the breaking joint information body to obtain a comprehensive evaluation body. The method is advantaged in that the development law of the compact oil and gas storage and seepage body can be visually reflected, and well position deployment can be evaluated with high precision and high efficiency; a good application effect is achieved in practical application, and the coincidence rate with a real drilling well is high.

Description

technical field [0001] The invention relates to the technical field of oil and gas exploration, in particular to a method for seismic fine characterization of tight oil and gas storage and seepage bodies. Background technique [0002] Tight oil and gas are widely distributed around the world and rich in resources. Internationally, oil and gas in reservoirs with overburden pressure permeability less than 0.1 mD and in non-shale rocks such as clastic rocks and carbonate rocks are generally defined as tight oil and gas. The main geological characteristics of tight oil and gas reservoirs are severe heterogeneity, small pore throat radius, high shale content, high water saturation, and strong reservoir sensitivity. Many years of practical experience on tight reservoirs at home and abroad show that: due to the tight and hard lithology of tight reservoirs, there are many natural fracture systems of different degrees, which are controlled by regional stress and have a certain direct...

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Problems solved by technology

[0004] Existing tight oil and gas exploration technologies have gradually developed towards refinement, but the existing technical methods are basically carried out around tight rock reservoirs or fractures alone, and a set of systems or methods for seismic fine characterization of tight oil and gas storage and seepage bodies have not yet been formed.

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