Method and device for establishing three-dimensional rock mass mechanical model of horizontal well section in unconventional oil and gas reservoirs

Abstract

The invention provides an unconventional oil and gas reservoir horizontal well section three-dimensional rock mass mechanical modeling method and device. The method includes the steps of determining an unconventional oil and gas reservoir horizontal well section object region; obtaining three-dimensional earthquake prestack gathered data in the object region; conducting elastic parametric inversion by adopting the three-dimensional earthquake prestack gathered data and obtaining a three-dimensional space elastic parameter data body in the object region, wherein the three-dimensional space elastic parameter data body comprises a rock mass poisson ratio and Young modulus; calculating a rock mass brittleness index according to the rock mass poisson ratio and the Young modulus; establishing a rock mass mechanical parameter model based on three-dimensional grid nodes according to the three-dimensional space elastic parameter data body and the rock mass brittleness index. The unconventional oil and gas reservoir horizontal well section three-dimensional rock mass mechanical modeling method and device can simply, effectively and accurately obtain an unconventional oil and gas reservoir rock mass mechanical model.

Description

Technical field [0001] The invention relates to the technical field of oil and gas reservoir development, in particular to a method for establishing a three-dimensional rock mass mechanical model of a horizontal well section of an unconventional oil and gas reservoir, and a device for establishing a three-dimensional rock mass mechanical model of a horizontal well section of an unconventional oil and gas reservoir. Background technique [0002] Unconventional oil and gas reservoirs refer to oil and gas deposits that are different from conventional oil and gas reservoirs in their characteristics, accumulation mechanism, and exploitation technology. There are many types of unconventional oil and gas resources, generally including tight and ultra-tight sandstone oil and gas, shale oil and gas, super heavy (heavy) oil, bituminous sandstone, coalbed methane, water-soluble gas, natural gas hydrate, etc. Among them, tight oil and gas (including tight sandstone oil and gas and tight carb...

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Problems solved by technology

[0004] Taking the existing logging evaluation of tight sandstone oil reservoirs as a typical example of unconventional oil and gas reservoir logging, due to the complex logging response characteristics of tight sandstone reservoirs, high capillary bound water content, oil and water co-production after fracturing, reservoir fluid It is difficult to identify properties, and the calculation error of tight sandstone reservoir parameters is relatively large. Moreover, tight sandstone reservoirs have similar macroscopic physical properties, electrical properties, and oil-bearing characteristics, but have large differences in microscopic pore throat characteristics, and large differences in reservoir productivity levels. Some unconventional oil and gas reservoir logging methods have the following problems: tight reservoirs have poor physical properties, complex pore structure, strong heterogeneity, and difficult reservoir logging evaluation (including reservoir parameters, water production after fracturing, and oil testing). The lower limit of the production layer corresponding to the method is determined, etc.)

At present, there is a lack of this technology at home and abroad

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