CN-122018034-A - Equivalent mineral model and skeleton parameter determination method and device

CN122018034ACN 122018034 ACN122018034 ACN 122018034ACN-122018034-A

Abstract

The application provides an equivalent mineral model and a skeleton parameter determining method and device, wherein the method comprises the steps of establishing an equivalent dry clay mineral and an equivalent brittle mineral to form an equivalent mineral pair, establishing an equivalent mineral model of a shale oil-gas reservoir, wherein the equivalent mineral model comprises organic matters, an equivalent dry clay mineral, an equivalent brittle mineral, pore oil gas and pore water, determining a logging response equation of the equivalent mineral model, carrying out whole-rock mineral analysis to determine skeleton parameters of the equivalent brittle mineral, determining total porosity and organic volume content, and determining skeleton parameters of the equivalent dry clay mineral according to the total porosity, the organic volume content and the skeleton parameters of the equivalent brittle mineral and combining the logging response equation. The application realizes rapid and reliable quantitative evaluation of shale oil gas based on equivalent mineral model and skeleton parameters mainly by means of conventional logging data.

Inventors

LI JUN
LU JING
HU SONG
LIU KUN
LIU MI

Assignees

中国石油化工股份有限公司
中国石油化工股份有限公司石油勘探开发研究院

Dates

Publication Date: 20260512
Application Date: 20241112

Claims (10)

1. An equivalent mineral model and skeleton parameter determination method for shale oil gas logging evaluation, comprising the following steps: establishing an equivalent dry clay mineral and an equivalent brittle mineral to form an equivalent mineral pair; Establishing an equivalent mineral model of a shale oil-gas reservoir, wherein the equivalent mineral model comprises organic matters, equivalent dry clay minerals, equivalent brittle minerals, pore oil gas and pore water; determining a logging response equation of the equivalent mineral model; carrying out all-rock mineral analysis and determining skeleton parameters of equivalent brittle minerals; Determining the total porosity and the organic volume content, and determining the skeleton parameters of the equivalent dry clay mineral according to the total porosity, the organic volume content and the skeleton parameters of the equivalent brittle mineral and combining the logging response equation.
2. The method of claim 1, wherein the establishing the equivalent dry clay mineral and the equivalent brittle mineral comprises comprehensively utilizing various logging data, determining a poor organic matter development stage, performing a density-neutron intersection diagram or an acoustic time difference-neutron intersection diagram on the poor organic matter development stage, determining a point group subsection range and a distribution rule, and if the point groups show obvious linear correlation, equivalent all clay minerals to equivalent dry clay minerals, equivalent all brittle minerals to equivalent brittle minerals, and forming an equivalent mineral pair.
3. The method of claim 1, wherein the skeletal parameters include density, neutron porosity, and sonic time difference.
4. The method of claim 1, wherein the log response equation for the equivalent mineral model is: Wherein ρ b 、ρ EMC 、ρ EMF 、ρ o 、ρ w 、ρ hy is the log density, the density of the equivalent dry clay mineral, the density of the equivalent brittle mineral, the density of the organic matter, the density of the water in the pores and the density of the oil gas in the pores, N l 、N EMC 、N EMF 、N o 、N w 、N hy is the neutron porosity of the log, the neutron porosity of the equivalent dry clay mineral, the neutron porosity of the equivalent brittle mineral, the neutron porosity of the organic matter, the neutron porosity of the water in the pores and the neutron porosity of the oil gas in the pores, respectively, and Delta t 、T EMC 、T EMF 、T o 、T w 、T hy is the sonic time difference of the log, the equivalent dry clay mineral, the sonic time difference of the equivalent brittle mineral, the sonic time difference of the organic matter, the sonic time difference of the water in the pores and the sonic time difference of the oil gas in the pores, respectively, and V EMC 、V EMF 、TOC v is the equivalent dry clay mineral skeleton volume content, the equivalent brittle mineral skeleton volume content and the organic matter volume content, respectively; Is the total porosity of the rock and s w is the water saturation in the pores.
5. The method of claim 1, wherein the performing a total rock mineral analysis to determine skeleton parameters of the equivalent brittle minerals comprises performing a total rock mineral analysis to determine a major mineral content, removing clay mineral content from the mineral component, calculating the remaining brittle minerals to determine a relative content of individual brittle minerals in the total brittle minerals, determining theoretical skeleton parameter values for individual brittle minerals, and determining skeleton parameters for the equivalent brittle minerals by weight averaging the relative content of individual brittle minerals in the total brittle minerals.
6. The method of claim 4, wherein the total porosity of the rock is determined by nuclear magnetic resonance logging, the organic volume content is calculated by delta LOG R method or other empirical formula, and the total porosity of the rock, the organic volume content and the skeleton parameters of the equivalent brittle mineral are substituted into the logging response equation, and the skeleton parameters of the equivalent dry clay mineral are determined by optimization iteration.
7. The method of claim 1, wherein after determining the total porosity and organic volume content, determining the skeleton parameters of the equivalent dry clay mineral in accordance with the skeleton parameters of the total porosity, the organic volume content, and the equivalent brittle mineral in conjunction with the log response equation, further comprising evaluating shale hydrocarbon interval formation composition and porosity in accordance with the skeleton parameters of the equivalent brittle mineral, the skeleton parameters of the equivalent dry clay mineral, and the log response equation.
8. An equivalent mineral model and skeleton parameter determining device, the equivalent mineral model and skeleton parameter determining method is used for shale oil gas logging evaluation, and is characterized by comprising the following steps: Establishing an equivalent mineral pair establishing module, and establishing an equivalent dry clay mineral and an equivalent brittle mineral to form an equivalent mineral pair; The method comprises the steps of establishing an equivalent mineral model of a shale oil-gas reservoir, wherein the equivalent mineral model comprises organic matters, equivalent dry clay minerals, equivalent brittle minerals, pore oil gas and pore water; a logging response equation determining module that determines a logging response equation for the equivalent mineral model; The framework parameter determining module of the equivalent brittle mineral is used for carrying out all-rock mineral analysis and determining framework parameters of the equivalent brittle mineral; and a skeleton parameter determination module of the equivalent dry clay mineral determines total porosity and organic volume content, and determines skeleton parameters of the equivalent dry clay mineral according to the total porosity, the organic volume content and the skeleton parameters of the equivalent brittle mineral and by combining the logging response equation.
9. An electronic device, comprising: A processor; a memory; and a computer program, wherein the computer program is stored in the memory, the computer program comprising instructions that, when executed by the processor, cause the electronic device to perform the method of any one of claims 1 to 7.
10. A computer readable storage medium, characterized in that the computer readable storage medium comprises a stored program, wherein the program, when run, controls a device in which the computer readable storage medium is located to perform the method of any one of claims 1 to 7.

Description

Equivalent mineral model and skeleton parameter determination method and device Technical Field The application relates to the technical field of unconventional shale oil and gas logging evaluation, in particular to an equivalent mineral model and skeleton parameter determining method, device, electronic equipment and storage medium. Background At present, important breakthrough is made in shale oil and gas exploration and development in China, and determination of components and physical properties of shale oil and gas reservoirs is a basic work of exploration and development. Under the condition of the calibration of a small amount of coring well core test data, the adoption of logging data to calculate the shale reservoir group content and the porosity is the most effective and economical means and is also the international mainstream technology. However, shale oil and gas lithology is complex, mineral components are complex, the most effective means for evaluating the complex stratum is to adopt a novel method logging technology, such as stratum element scanning logging, high-precision two-dimensional nuclear magnetic resonance logging, well wall imaging logging and the like, but in production practice, the method is limited by cost factors and time factors, and only conventional logging data (density, neutrons, acoustic waves, resistivity logging and the like) and a small number of novel method logging are usually adopted. The development of complex shale oil and gas exploration is urgent to realize rapid and accurate evaluation of shale oil and gas stratum components and porosity mainly by means of conventional logging data. The current multi-mineral component volume model and the logging response equation thereof are the theoretical basis of logging stratum evaluation. And (3) establishing logging response equations such as density logging, neutron logging, acoustic logging, natural gamma logging and the like based on the multi-mineral-component volume model, and determining rock mineral components and porosity by utilizing an optimization algorithm, so that the method becomes a universal technology in industry. However, shale oil gas has complex lithology and complex mineral components, and the mineral components comprise various clay mineral types such as kaolinite, montmorillonite, illite, chlorite and the like, various brittle mineral types such as quartz, calcite, dolomite, feldspar, pyrite and the like, and also comprise organic matters and pores. The shale oil and gas stratum evaluation requirement cannot be met by simply relying on a multi-mineral-component volume model and a logging response equation thereof. The acquisition of logging data is always limited by various geological and economic factors, and under the condition of limited logging data, the accurate determination of the content and the porosity of various mineral components in complex shale oil and gas is impossible. Therefore, how to obtain an equivalent mineral model and a logging response equation thereof which accord with shale oil gas reservoirs by mainly relying on conventional logging data and combining geological features to carry out equivalent simplification, and obtain relatively accurate stratum parameters becomes a technical problem to be solved in shale oil gas logging evaluation. Disclosure of Invention In view of the above, the application provides a method and a device for determining equivalent mineral models and skeleton parameters, which are used for solving the technical problem that the components and the porosity of shale oil and gas stratum cannot be rapidly and accurately evaluated mainly by means of conventional logging data in the prior art. In a first aspect, an embodiment of the present application provides an equivalent mineral model and skeleton parameter determining method, where the equivalent mineral model and skeleton parameter determining method are used for shale oil gas logging evaluation, and the method includes: establishing an equivalent dry clay mineral and an equivalent brittle mineral to form an equivalent mineral pair; Establishing an equivalent mineral model of a shale oil-gas reservoir, wherein the equivalent mineral model comprises organic matters, equivalent dry clay minerals, equivalent brittle minerals, pore oil gas and pore water; determining a logging response equation of the equivalent mineral model; carrying out all-rock mineral analysis and determining skeleton parameters of equivalent brittle minerals; Determining the total porosity and the organic volume content, and determining the skeleton parameters of the equivalent dry clay mineral according to the total porosity, the organic volume content and the skeleton parameters of the equivalent brittle mineral and combining the logging response equation. Further, the method for establishing the equivalent dry clay mineral and the equivalent brittle mineral comprises the steps of comprehensively utilizing various logging data,