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CN-122021468-A - Oil gas hydrocarbon generation pressurizing and filling wave and range characterization method based on energy conservation

CN122021468ACN 122021468 ACN122021468 ACN 122021468ACN-122021468-A

Abstract

The invention discloses an oil-gas hydrocarbon generation pressurizing and filling wave and range characterization method based on energy conservation, and relates to the technical field of petroleum exploration and development. Aiming at the problem that the traditional method focuses on macroscopic reservoir qualitative description and lacks an accurate quantification method of the filling degree, the method is used for calculating the total hydrocarbon discharging kinetic energy of hydrocarbon source rock hydrocarbon discharging by superposing energy of different sources, wherein the energy of different sources comprises the underpressure kinetic energy, the hydrocarbon generating volume expansion kinetic energy and the fluid elastic energy, quantifying the energy attenuation of oil gas in the process of moving from the hydrocarbon source rock to a reservoir, and determining the filling distance limit based on the total hydrocarbon discharging kinetic energy and the energy attenuation in the moving process.

Inventors

  • HUANG WENBIAO
  • WU ZHIHAO

Assignees

  • 中国石油大学(华东)

Dates

Publication Date
20260512
Application Date
20260413

Claims (6)

  1. 1. The method for characterizing the hydrocarbon-generating pressurizing and filling wave and range of the oil gas based on energy conservation is characterized in that, The total hydrocarbon discharging kinetic energy of hydrocarbon source rock hydrocarbon discharging is calculated by superposing energy from different sources, wherein the energy from different sources comprises underpressure kinetic energy, hydrocarbon generating volume expansion kinetic energy and fluid elastic energy; quantifying the energy decay of the hydrocarbon during migration from the source rock to the reservoir; Based on the total hydrocarbon removal kinetic energy and the energy decay in the migration process, a filling distance limit is defined, when filling occurs at a certain point in the reservoir, the remaining energy is insufficient to overcome capillary resistance at the point, so: ; In the formula, Representing the remaining energy; Representing the initial total hydrocarbon removal kinetic energy; Representing the comprehensive unit friction of the j-th section of the uniform sand body in the hydrocarbon fluid migration path; the length of the homogenizing sand body is the j section in the hydrocarbon fluid migration path, and n represents the number of sections of the homogenizing sand body.
  2. 2. The method for characterizing hydrocarbon-producing pressurized filling wave and range based on energy conservation as defined in claim 1, wherein the specific implementation process of obtaining the underpressure kinetic energy is as follows: step S111, collecting an acoustic time difference logging curve of a target logging and measured stratum pressure data; Step S112, selecting a pure mudstone section on the acoustic time difference logging curve to establish acoustic time difference Depth and depth of Normal compaction trend line equation of (2): ; In the formula, The compaction factor is indicated as such, Representing the earth's surface acoustic wave time difference; step S113, taking the measured stratum pressure as total overpressure Extracting under-compaction overpressure; ; ; ; Wherein, the Is under-compacted and over-pressurized; is the total overpressure; contributing coefficients for underpressure overpressure; is the actual acoustic wave time difference; Normal compaction trend values at the same depth; converting coefficients for regional experience; Is the underpressure kinetic energy; Is seepage efficiency; Is porosity.
  3. 3. The method for characterizing hydrocarbon-generating, pressurizing and charging wave and range of oil and gas based on energy conservation as recited in claim 1, wherein the specific implementation process for obtaining the volume expansion kinetic energy of the hydrocarbon-generating is as follows: ; ; ; ; ; ; ; In the formula, Volumetric expansion kinetic energy for hydrocarbon generation; Is the formation pressure; Volume increment caused by hydrocarbon generation, alpha is a pressure coefficient; g is gravity acceleration; the quality of raw oil; a is the conversion rate of raw hydrocarbon; Is the density of the hydrocarbon source rock; Is the volume of crude oil; is the density of crude oil; is the volume of the generated gas; Is the dissolved gas-oil ratio; is the volume of kerogen; the quality of the kerogen; is the kerogen density.
  4. 4. The method for characterizing hydrocarbon-producing pressurized filling wave and range based on energy conservation as defined in claim 1, wherein the fluid elastic energy is obtained by the following specific implementation process: ; In the formula, Is fluid elastic energy; is the fluid compression coefficient; Is the formation pressure; Is the pore volume.
  5. 5. The method for characterizing hydrocarbon-generating, pressurizing, filling and range for hydrocarbon production based on energy conservation as recited in claim 1, wherein the step of quantifying energy attenuation of hydrocarbon during migration from source rock to reservoir is performed by determining a distance of migration path Substituting the friction resistance into the following formula, calculating to obtain the comprehensive unit friction resistance, and quantifying the energy attenuation of the migration path; ; ; ; ; ; ; ; In the formula, Representing distance from source rock The remaining energy at the location; Representing initial energy at the source rock; Representing migration paths; Represents the friction per unit distance; Expressed as viscous friction; represents capillary friction; represents gravity friction; represents the additional friction of the fidaxs seepage; Indicating the viscosity of the crude oil, ; Indicating the effective permeability of the reservoir; Representing the oil and gas charge flow rate; indicating the start-up pressure gradient that is to be applied, ; Representing the non-uniformity coefficient; the mean value of the capillary force is shown, ; Representing a unit migration volume; 、 water and oil densities, respectively; gravitational acceleration; is the inclination angle of the migration path; viscosity of hydrocarbon fluid; Is the flow rate of the hydrocarbon fluid; Is the feddalix coefficient; is the fluid density; Representing the total unit friction.
  6. 6. The method for characterizing hydrocarbon-generating, pressurizing, filling and range characterizing of an oil and gas based on energy conservation as recited in claim 5, wherein the migration path is segmented according to segments of the homogenized sand to obtain the length of the segment of the homogenized sand, and the comprehensive unit friction of the homogenized sand is calculated.

Description

Oil gas hydrocarbon generation pressurizing and filling wave and range characterization method based on energy conservation Technical Field The invention relates to the field of oil and gas exploration and development, in particular to an oil and gas hydrocarbon generation boosting filling wave and range characterization method based on energy conservation. Background The unconventional reservoir has the characteristics of low pores, low permeability and strong heterogeneity, the reservoir space is mainly provided with nanoscale pores, the seepage and reservoir forming processes are complex, the traditional theory is difficult to adapt, the efficient development is restricted, and the targeted reservoir forming theory and technical support are needed. The reservoir dynamics is used as a crossing leading edge discipline of oil gas geology and dynamics, the reservoir dynamics-resistance balance is used as a core, the full flow power law of oil gas reservoir is researched, and a key theoretical support is provided for unconventional oil gas development. The method has the advantages of being high in efficiency, low in cost, convenient to use, and easy to operate, and has the advantages of being convenient to use, being capable of accurately identifying the filling power source (hydrocarbon source rock hydrocarbon generation pressurization and the like), determining the power loss mechanism, judging the effective filling condition of the reservoir, revealing the nanoscale pore migration filling mechanism, achieving the heterogeneous regulation effect of the reservoir, locking the high-quality reservoir (dessert area), guiding the optimization of the development scheme, providing reference for the design of fracturing parameters, and improving the development efficiency and the recovery ratio. The current reservoir-forming dynamics research still has the defects that the traditional research focuses on macroscopic reservoir-forming qualitative description and lacks an accurate quantification method for the filling degree. Disclosure of Invention The application aims to provide an oil gas hydrocarbon generation pressurizing and filling wave and range characterization method based on energy conservation, which is used for defining an acquisition method of total energy of hydrocarbon discharge from source rock and multi-factor energy attenuation of a system quantitative migration path, establishing a scientific and operable full-flow energy coupling model, realizing precise and quantitative characterization of filling distance of an unconventional oil gas reservoir and solving the problems of static evaluation, insufficient precision and poor adaptability in the prior art. In order to solve the technical problems, the application adopts the following scheme: The method for characterizing the hydrocarbon-generating pressurizing and filling wave and range of the oil gas based on energy conservation comprises the following steps: Step 100, superposing energy from different sources to calculate total hydrocarbon discharging kinetic energy of hydrocarbon source rock hydrocarbon discharging, wherein the energy from different sources comprises underpressure kinetic energy, hydrocarbon generating volume expansion kinetic energy and fluid elastic energy; step 200, quantifying energy attenuation of oil gas in the process of moving from a hydrocarbon source rock to a reservoir; Step S300, determining the limit of the filling distance based on the total hydrocarbon discharging kinetic energy and the energy attenuation of the migration process. As a specific embodiment, the specific implementation procedure of step S100 is based on the principle of thermodynamic energy superposition, as follows: The method comprises the steps of obtaining sedimentary compaction data by using a logging curve, separating a subcompact overpressure contribution value from hydrocarbon source rock hydrocarbon discharge overpressure to obtain subcompact kinetic energy, calculating hydrocarbon generation pressurizing energy by a numerical integration method by combining thermal simulation PVT experimental data to obtain hydrocarbon generation volume expansion kinetic energy, calculating fluid elasticity energy according to rock or fluid compression coefficients and formation pressure, and superposing the subcompact kinetic energy, the hydrocarbon generation volume expansion kinetic energy and the fluid elasticity energy to obtain total hydrocarbon discharge kinetic energy. In some embodiments, the following is a specific implementation of the process of obtaining the underpressure kinetic energy: step S111, collecting an acoustic time difference logging curve of a target logging and measured stratum pressure data; Step S112, selecting a pure mudstone section on the acoustic time difference logging curve to establish acoustic time difference Depth and depth ofNormal compaction trend line equation of (2):; In the formula, The compaction factor is indicat