Method for quantitatively evaluating ultra-deep reservoir diagenesis and pore evolution

A technology for diagenesis and quantitative evaluation, which is applied in the field of fine description of oil and gas reservoirs, and can solve the problem that the original porosity is less than 40%.

Inactive Publication Date: 2017-02-15
XI'AN PETROLEUM UNIVERSITY
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Problems solved by technology

[0004] Existing research is mainly on the quantitative evaluation method of reservoir diagenesis and pore evolution. The main problem is that most domestic and foreign problems concerning the evolution of porosity parameters in the process of reservoir diagenesis are basically Based on the original porosity of the reservoir is 40%, but most of the continental sandstone reservoirs in my country, the original porosity is basically less than 40%, which will inevitably produce a certain deviation

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  • Method for quantitatively evaluating ultra-deep reservoir diagenesis and pore evolution
  • Method for quantitatively evaluating ultra-deep reservoir diagenesis and pore evolution
  • Method for quantitatively evaluating ultra-deep reservoir diagenesis and pore evolution

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[0034] Select certain oil field sample below in conjunction with accompanying drawing and describe the present invention in detail.

[0035] The present invention quantitatively evaluates the method of microscopic pore characteristics of deep high-pressure low-permeability sandstone reservoirs, see figure 1 shown, including the following steps:

[0036] Step 1. Analyze the geological background of the research area, including: regional geological background, structural features, and burial depth of oil and gas reservoirs, and the burial depth is required to be more than 4000m;

[0037] Step 2. According to the burial depth of the oil and gas reservoir, determine the burial depth limit of the reservoir, and analyze the petrological characteristics of the reservoir in the research area, including: clastic composition characteristics and interstitial characteristics. From figure 2 It can be seen from the figure that the clastic components of the reservoir rocks are mainly quar...

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Abstract

A method for quantitatively evaluating ultra-deep reservoir diagenesis and pore evolution comprises the steps of first, analyzing geological background of a research area; second, determining reservoir burial depth limit according to oil-gas reservoir burial depth, and analyzing lithological features of a research area reservoir; third, analyzing diagenesis, and dividing indexes according to multiple diagenetic sequences; fourth, analyzing physical distribution law, dividing physical development zones according to core physical analytical data, and studying controlled factors of reservoir physical distribution according to deposition and diagenetic evolution process experienced by the reservoir; fifth, investigating quantitative evolution law of reservoir porosity by studying the evolution of porosity parameters; sixth, analyzing errors, to be specific, investigating errors of porosity parameter calculation method by using porosity parameters obtained by using physical property analytical method as references, and analyzing main factors that influence the errors; in the method, a quantitative model for deep reservoir porosity evolution is acquired through experiments, and deviations due to excessively high original porosity of a reservoir are overcome.

Description

technical field [0001] The invention relates to the technical field of fine description of oil and gas reservoirs, in particular to a quantitative evaluation method for diagenesis and pore evolution of ultra-deep reservoirs. [0002] technical background [0003] With the increasing demand for energy in my country, it is necessary to carry out in-depth research on ultra-deep reservoirs. It is urgent to quantify the impact of basin diagenetic fluids on the formation of authigenic minerals and the evolution of secondary pores, and to quantitatively evaluate reservoir pore types, content, pore size, Physical parameters such as pore diameter and throat diameter and their evolution characteristics. Since the reservoir rock samples studied and analyzed today are samples that have undergone various geological evolutions and diagenesis superimpositions, the characteristics of ultra-deep reservoirs such as diagenesis and pore evolution cannot be clearly observed, and it is impossible t...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/24
CPCG01N33/24
Inventor 王瑞飞赵良金何润华苏琛
Owner XI'AN PETROLEUM UNIVERSITY
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