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CN-121996864-A - Calculation method, device, medium and equipment for rock geochemical parameters

CN121996864ACN 121996864 ACN121996864 ACN 121996864ACN-121996864-A

Abstract

The invention discloses a calculation method, a device, a medium and equipment of rock geochemical parameters. The method comprises the steps of S10, obtaining TOC and pyrolysis data, S20, establishing a type dominance index classification function, obtaining a type dominance index TPI, S30, dividing dominance type units based on a Fisher discriminant method, S40, establishing a calculation model of S 2 in a segmented mode according to dividing results, S50, calculating the TOC of the whole well section, S60, substituting the calculation results of the TOC of the whole well section into the calculation model to obtain S2 values corresponding to all measuring points, and realizing continuous calculation of S 2 . The invention divides the dominant type unit by Fisher discrimination, establishes a calculation model of S 2 by dividing results, calculates the TOC of the whole well section by logging curves, and acquires the S 2 value corresponding to each measuring point by substituting the calculation result of the TOC of the whole well section into the calculation model, thereby realizing continuous calculation of S 2 , leading the absolute error of calculation parameters and test parameters to be smaller, and completely meeting the technical requirements of deep oil and gas exploration and development by precision.

Inventors

  • WANG ZHENLIN
  • LIU CAIGUANG
  • TANG FUKANG
  • WANG WEI
  • CHEN SHANHE
  • YANG WANGWANG
  • ZHENG GUOQING
  • CHEN GANG
  • LI WEI
  • CHANG TING

Assignees

  • 中国石油天然气股份有限公司

Dates

Publication Date
20260508
Application Date
20241107

Claims (9)

  1. 1. A method of calculating a petrogeochemical parameter, the method of calculating a petrogeochemical parameter comprising the steps of: S10, TOC and pyrolysis data are obtained; S20, establishing a type dominance index classification function, and acquiring a type dominance index TPI; S30, dividing the dominant type units based on Fisher discrimination; s40, establishing a calculation model of the rock geochemical parameters S 2 in a segmented mode according to the division result; S50, calculating TOC of the whole well section; S60, substituting the calculation result of the TOC of the whole well section into the calculation model to obtain an S 2 value corresponding to each measuring point, so as to realize continuous calculation of S 2 .
  2. 2. The method of calculating a petrogeochemical parameter according to claim 1, wherein step S10 comprises the steps of: s110, performing a core total organic carbon experiment and a rock pyrolysis experiment; And S120, obtaining TOC and pyrolysis data based on experimental results, wherein the pyrolysis data comprises S 1 、S 2 and HI.
  3. 3. The method of calculating a petrogeochemical parameter according to claim 1, wherein said step S20 comprises the steps of: s210, establishing a type dominance index classification function based on the following formula: (1) Wherein TPI is type dominance index, is dimensionless, S 1 is the content of liquid hydrocarbon stored in a rock sample evaporated at a temperature of 300 ℃ at a certain heating rate, mg/g, HI is hydrogen index; S220, acquiring a type dominance index TPI.
  4. 4. The method of calculating a petrogeochemical parameter according to claim 1, wherein the step S30 comprises the steps of: s310, arranging the acquired TPI in ascending order as a scatter diagram, taking inflection points of a curve as segmentation points, and classifying the measurement points into 3 types; S320, for different types of measuring points, a distinguishing function is established by using Fisher distinguishing method and logging data, and dominant type units are divided.
  5. 5. The method of claim 4, wherein the well log data includes lithology, formation pressure, temperature, and fluid properties.
  6. 6. The method of calculating a petrogeochemical parameter according to claim 1, wherein said step S50 comprises the steps of: s510, acquiring a logging curve based on downhole measurement and laboratory analysis; S520, calculating the TOC of the whole well section based on the logging curve.
  7. 7. A computing device for rock geochemical parameters, comprising: The data acquisition module is used for acquiring TOC and pyrolysis data; the function building module is used for building a type dominance index classification function and obtaining a type dominance index TPI; The unit dividing module is used for dividing the dominant type units based on the Fisher discrimination method; The model building module is used for building a calculation model of S 2 according to the division result segments; The TOC calculation module is used for calculating the TOC of the whole well section; And the calculation result substituting module is used for substituting the calculation result of the total well section TOC into the calculation model to obtain the corresponding S 2 value of each measuring point, so as to realize continuous calculation of S 2 .
  8. 8. A computer readable storage medium comprising instructions which, when run on a computer, cause the computer to perform the method of calculating a petrogeochemical parameter according to any one of claims 1 to 6.
  9. 9. A computing device, the computing device comprising: At least one processor, memory, and input output unit; Wherein the memory is used for storing a computer program, and the processor is used for calling the computer program stored in the memory to execute the calculation method of the rock geochemical parameters according to any one of claims 1-6.

Description

Calculation method, device, medium and equipment for rock geochemical parameters Technical Field The invention relates to the technical field of well logging evaluation, in particular to a method, a device, a medium and equipment for calculating geochemical parameters of rock. Background The geochemical parameter S 2 is the weight per thousandth of organic carbon obtained by pyrolysis at a temperature range of 300 ℃ to 600 ℃ and is in mg/g. The method has the meaning that under the condition of the current maturity, the organic matters can be cracked and converted into petroleum, namely the crude oil potential of kerogen, under the condition of certain maturity, the difference of the S 2 values can indicate the difference of the organic matters types, and the accurate calculation S 2 can grasp the characteristics of the hydrocarbon source rock more comprehensively, so that the method provides basis for recovering organic carbon, calculating the crude hydrocarbon and the like, and further guides exploration and development more efficiently. Therefore, the research of the logging calculation method of the hydrocarbon source rock geochemical parameter S 2 is of great significance. However, the geochemical characteristics of rock have a certain internal relation with logging, but accurate calculation of geochemical parameters is always a difficult point due to measurement deviation, unknown internal mechanism, insignificant correlation between the two and the like. Disclosure of Invention The invention mainly aims to provide a method and a device for calculating rock geochemical parameters, which are used for solving the technical problem that the rock geochemical parameters are difficult to calculate accurately in the prior art. In order to achieve the aim, the invention provides a calculation method of rock geochemical parameters, which comprises the following steps of S10, S20, establishing a type dominance index classification function, and obtaining a type dominance index TPI, S30, dividing dominance type units based on Fisher discriminant; S40, establishing a calculation model of the rock geochemical parameters S 2 in a segmented mode according to the dividing result, S50, calculating the TOC of the whole well section, S60, substituting the calculation result of the TOC of the whole well section into the calculation model to obtain an S 2 value corresponding to each measuring point, and realizing continuous calculation of S 2. Optionally, the step S10 comprises the steps of S110, carrying out a rock core total organic carbon experiment and a rock pyrolysis experiment, and S120, obtaining TOC and pyrolysis data based on experimental results, wherein the pyrolysis data comprises S 1、S2 and HI. Optionally, the step S20 includes the step S210 of creating a type dominance index classification function based on the following formula: (1) Wherein TPI is a type dominance index, S 1 is the content of liquid hydrocarbon stored in a rock sample evaporated at a temperature of 300 ℃ at a certain heating rate, mg/g, and HI is a hydrogen index. Optionally, the step S30 comprises the steps of S310 of arranging the acquired TPI in ascending order as a scatter diagram, taking inflection points of curves as segmentation points and classifying the measurement points into 3 types, and S320 of establishing a discriminant function for the measurement points of different types by using Fisher discriminant method and logging data to divide the dominant type units. Optionally, the logging data includes lithology, formation pressure, temperature, and fluid properties. Optionally, the step S50 includes the steps of S510 acquiring a log based on downhole measurements and laboratory analysis, S520 calculating a full wellbore section TOC based on the log. In addition, in order to achieve the above purpose, the embodiment of the application also provides a calculation device for rock geochemical parameters, which comprises a data acquisition module, a function establishment module, a unit division module, a model establishment module, a TOC calculation module and a calculation result substitution module, wherein the data acquisition module is used for acquiring TOC and pyrolysis data, the function establishment module is used for establishing a type dominance index classification function to acquire a type dominance index TPI, the unit division module is used for dividing dominance type units based on a Fisher discriminant method, the model establishment module is used for establishing a calculation model of S 2 according to division results, the TOC calculation module is used for calculating the TOC of a whole well section, and the calculation result substitution module is used for substituting the calculation result of the TOC of the whole well section into the calculation model to acquire an S 2 value corresponding to each measuring point so as to realize continuous calculation of S 2. In addition, to achieve the above object, an emb