Unconventional reservoir multi-scale fusion method based on digital core technology

Abstract

An unconventional reservoir multi-scale fusion method based on the digital core technology comprises the steps that 1, a tight sandstone three-dimensional digital stratum initial physical model is constructed according to electric imaging logging information and logging curve data; 2, according to a three-dimensional digital rock physical experiment of the compact sandstone digital core, establishing a quantitative relation model of a pore microstructure, fluid characteristics, mineral components and rock physical attributes; 3, fusing the resistivity reflecting the pore microstructure into the three-dimensional digital stratum physical model of the logging detection scale by adopting a finite element resistivity numerical simulation method, and obtaining a digital stratum resistivity curve; and 4, based on the tight sandstone three-dimensional digital stratum, determining the influence of the pore microstructure on the physical properties of the stratum. A quantitative relationship between a core micro-pore structure and physical attributes is established by adopting a three-dimensional digital rock physical experiment based on a digital core, and memory consumption is reduced through physical attribute fusion.

Description

technical field [0001] The invention belongs to the field of exploration, and in particular relates to a multi-scale fusion method for unconventional reservoirs based on digital rock core technology. Background technique [0002] Unconventional reservoirs such as tight sandstone and shale are currently the focus and hotspots of oil and gas exploration and development. However, the size distribution of pores in tight sandstone and shale is wide, and nanopores, micropores, and even hundreds of microns are affected by the microstructure of pores. Rock macroscopic physical properties and seepage characteristics. Therefore, many scholars are committed to image fusion technology to integrate pores of different scales (sizes) into the same scale core model, so as to study the influence of pore microstructure on petrophysical properties, and thus study the microscopic mechanism of petrophysical properties. [0003] However, the problems existing in the existing technology are: (1) ...

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Problems solved by technology

[0003] However, the problems existing in the existing technology are: (1) The nanometer-sized pores are fused into the micron-sized pore structure through the image fusion technology, the core model has a large storage capacity, and the memory capacity consumption of the model makes it impossible to integrate the nanometer-sized pores through the image fusion technology. The pores are fused into the laboratory core size model; (2) The actual size of the model established by graphic fusion technology is only a few microns, and the core model of this size cannot express strong heterogeneity tight sandstone and shale reservoirs

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