Gas pool prediction method and system of carbonate reservoir based on pore structure characteristics

Abstract

The invention provides a gas pool prediction method and system of a carbonate reservoir based on pore structure characteristics. The method comprises the following steps: collecting a rock sample of a target reservoir section of the carbonate reservoir; authenticating geological thin sheets of the rock sample so as to obtain rock basic parameters comprising the rock constituents, the pore shape, the surface porosity and the sedimentary phase belt; carrying out pore permeation measurement on the rock sample so as to obtain pore permeation basic parameters comprising the porosity, the permeation rate and the density; constructing a rock bare-bone model according to the rock basic parameters, the pore permeation basic parameters and a differential equivalent medium model; carrying out fluid replacement on the rock bare-bone model so as to generate a rock physical plate; acquiring prestack seismic inversion data of the carbonate reservoir; intersecting the prestack seismic inversion data and the rock physical plate, thereby obtaining the prediction results of the porosity and the gas saturation of the carbonate reservoir. The accurate quantitative gas pool prediction is realized.

Description

technical field [0001] The present invention relates to the technical field of oil and gas exploration, in particular to the prediction technology of carbonate rock reservoirs, specifically a gas reservoir prediction method and system for carbonate rock reservoirs based on pore structure characteristics. Background technique [0002] According to USGS statistics in 2000, the recoverable resources of marine carbonate rocks accounted for 72% of the total recoverable resources of oil and gas in the world, taking a dominant position. The unproven oil and gas reserves of carbonate rocks are far more abundant than those of clastic rocks, and their exploration potential is huge. As an excellent carbonate reservoir, organic reefs are the focus and difficulty of oil and gas exploration. [0003] Carbonate reservoirs have complex pore structure and strong heterogeneity, which will have a great impact on seismic wave velocity. Through research, it is found that the velocity of carbon...

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Problems solved by technology

[0008] (1) The pore structure in the carbonate reservoir development area is complex, and the conventional petrophysical model based on a single pore structure has applicability problems in the whole area;

[0009] (2) Carbonate reservoirs are highly heterogeneous, and conventional fluid replacement methods based on uniform fluid mixing cannot accurately describe the distribution of underground rocks and fluids

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