Dolomite reservoir pore compression resistance effect identification and evaluation method and system

Abstract

The invention discloses a dolomite reservoir pore anti-compaction effect response judgment and evaluation method and system, and the method comprises the steps: setting a pressure parameter in a simulation mechanical compaction effect; respectively preparing a plunger sample, a microscope slice and a powder sample from the selected dolomite sample; carrying out porosity and permeability analysis on the plunger sample; performing X-ray diffraction analysis on the powder sample; analyzing the microscope slice sample by using a microscope; performing lithology naming on the dolomite sample; carrying out CT scanning on the plunger sample; performing mechanical compaction action simulation on the plunger sample according to the pressure parameters to obtain the porosity and permeability of thedolomite sample under different pressure actions; according to the initial porosity and the initial permeability of the dolomite sample, and the porosity and the permeability under the action of different pressures, obtaining the porosity preserving rate and the permeability preserving rate of the dolomite sample; quantitatively evaluating the anti-compaction effect of dolomite in the mechanical compaction process.

Description

technical field [0001] The invention relates to the field of petroleum geological analysis, in particular to a method and system for identifying and evaluating the anti-compaction effect of dolomite reservoir pores. Background technique [0002] Dolomite is a very important oil and gas reservoir. According to the statistics of 342 carbonate oil and gas fields in the world by C&C Company, among the 46 carbonate oil and gas fields with a buried depth greater than 4500m or an age earlier than the Silurian, all but 4 Except limestone as the reservoir, the rest all use dolomite as the reservoir. [0003] In recent years, China has continuously made breakthroughs in oil and gas exploration in marine carbonate rocks, especially in the discovery of several large (oil) gas fields in dolomite reservoirs, such as the Moxi-Gaoshiti gas field in the Sichuan Basin, the Hetianhe gas field in the Tarim Basin Gas field, Sulige gas field in Ordos Basin, Puguang super-large gas field in Sichu...

AI Technical Summary

Problems solved by technology

In addition, the compaction method of granular samples cannot carry out quantitative analysis of rock porosity and permeability evolution, so it is impossible to quantitatively evaluate the anti-compaction effect of dolomite

[0007] At present, the analysis method of dolomite compaction is mainly through core thin-section microscope analysis. According to the contact relationship between particles in the rock and the degree of deformation, the existence and strength of compaction can be qualitatively inferred, but it cannot quantitatively analyze the compression resistance of dolomite with different pore types. real effect

In addition, a carbonate rock compaction analysis method was proposed, which collects core plunger samples from shallow to deep buried formations, measures sample porosity and permeability parameters, and establishes carbonate rock-depth relationship curves. Schmoker in In 1982, a quantitative study was carried out on the characteristics of carbonate rock compaction in the South Florida Basin, and a qualitative understanding was obtained that dolomite is more resistant to compaction than limestone and is conducive to the preservation of pores, which proved to a certain extent that deep carbonate rock reservoirs Many layers are dominated by dolomite in exploration practice, but it still cannot answer which type of dolomite is more resistant to compaction

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