Shale reservoir earthquake identification method

Abstract

The invention discloses a seismic identification method for shale reservoirs, which utilizes seismic exploration to identify the structural form, depth, thickness and distribution of shale rock formations, conducts exploration well construction in areas where the identified shale formations are fully developed, and performs well logging for the exploration wells According to the logging interpretation, the sedimentary microfacies of the shale intervals are divided, and the favorable shale sedimentary microfacies development intervals are screened out to determine their distribution range; then pre-stack seismic inversion is carried out for the screened favorable sedimentary shale intervals, Screen out favorable oil and gas-bearing intervals, analyze the structural principal curvature, seismic coherence body and variance attributes of such intervals, and screen out intervals with large curvature and irrelevant or discontinuous seismic data as favorable fracture development intervals , combined with shale brittleness evaluation, to determine high-quality shale reservoirs, and to realize the purpose of shale gas reservoir identification based on seismic technology.

Description

technical field [0001] The invention relates to the field of geological exploration and development, in particular to a seismic identification method for shale reservoirs. Background technique [0002] Shale gas reservoirs exist in the source rock strata in an adsorbed state on the surface of organic matter and clay minerals, or in a free state in the pores and fractures of the shale matrix, showing typical "self-generation and self-storage" accumulation characteristics. Shale oil and gas, as a new source of energy extraction in recent years, has broad prospects around the world for the development of oil and gas resources from oil source formations that were previously thought to be unable to store oil and gas. Unlike the pore channels in conventional sandstone reservoirs, fractures are used in shale formations for oil and gas migration. Fractures can not only provide shale gas accumulation space, but also provide migration channels for shale gas production. Shale gas has ...

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Problems solved by technology

[0003] The purpose of the present invention is to propose a seismic identification method for shale gas reservoirs, to solve the problem of lack of systematic methods in the exploration and development of shale gas in the prior art, and to realize the purpose of identification of shale gas reservoirs with seismic technology as the main body

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