A method for constructing 3D digital cores of fractured carbonate rocks

Abstract

The invention provides a construction method for a three-dimensional digital core of fractured carbonate rock. The method comprises the following steps: constructing a three-dimensional digital carbonate core only containing matrix pores by using X-ray CT; determining the formation mechanism of a crack; constructing a rough crack surface and generating a crack with self-affine fractal characteristics by using a fractional Brownian motion model; determining the type of the crack according to the force mechanism of crack formation, synthesizing a crack with a certain width and carrying out rotation transformation so as to obtain cracks with different inclination angles; and subjecting the constructed crack with the three-dimensional digital core with matrix pores constructed by using the X-ray CT method to same-resolution superposition so as to obtain the three-dimensional digital core of the fractured carbonate rock with the matrix pores and crack pores. The construction method provides a medium for simulation study of the physical attributes of rocks of fractured carbonate reservoirs and has high application value in research on the physical properties of fractured carbonate rock.

Description

technical field [0001] The invention relates to the fields of digital rock core and computational rock physics, in particular to a method for constructing a fractured carbonate rock three-dimensional digital rock core by combining X-ray CT scanning technology and a fractional Brownian motion model. Background technique [0002] In the distribution of oil and gas fields in the world, carbonate reservoirs occupy a very important position. The oil and gas fields composed of carbonate reservoirs often have large output and high output, and are easy to form large oil and gas fields. Many large oil and gas fields in the world are developed in carbonate reservoirs. Among the rock reservoirs, according to previous statistics, the oil and gas reserves found in carbonate rock reservoirs are close to half of the world's total reserves, and the oil and gas production accounts for more than 60% of the world's total production. Compared with conventional clastic rock reservoirs, one of th...

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Problems solved by technology

[0003] In order to overcome the difficulties in coring fractured carbonate rocks, the difficulty in carrying out petrophysical experiments, and the shortcomings of existing fracture models, the purpose of the present invention is to provide a method for constructing a three-dimensional digital core of fractured carbonate rocks. Dual-porosity characteristics of salt rock reservoirs Construct 3D digital cores of carbonate rocks containing matrix pores and fracture pores, thus providing a medium for the simulation of petrophysical properties of fractured carbonate rock reservoirs

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