An evaluation method of organic carbon recovery coefficient based on hydrocarbon generation and expulsion rate of source rocks

Abstract

The invention provides a method for evaluating the recovery coefficient of organic carbon based on the hydrocarbon generation and expulsion rate of source rocks. The method includes: conducting thermal simulation experiment design and conventional source rock rock sample analysis and testing, thermal simulation experiments include source rock thermal simulation experiments and oil sample thermal simulation experiments; data collection, including collecting geochemical data of target layers in the research area , geological stratification data, paleogeothermal gradient, paleosurface temperature, denudation thickness, and corresponding geological age data in the study area; evaluate the hydrocarbon generation rate of source rocks; evaluate the hydrocarbon expulsion rate of source rocks; Evaluation model of hydrocarbon expulsion rate of source rocks, establishment of evaluation model of organic carbon recovery coefficient, and completion of evaluation of organic carbon recovery coefficient based on hydrocarbon generation and expulsion rate of source rocks. The evaluation method of the invention solves the problems existing in previous methods for evaluating the recovery coefficient of organic carbon, and can accurately evaluate the recovery coefficient of organic carbon.

Description

technical field [0001] The invention relates to an evaluation method of resources, in particular to an evaluation method of organic carbon recovery coefficient based on the hydrocarbon generation and expulsion rate of source rocks, and belongs to the technical field of oil and gas resource evaluation. Background technique [0002] Oil and gas resource evaluation is an effective method for the amount of oil and gas in petroleum basins, and the recovery coefficient of organic carbon is a key parameter in oil and gas resource evaluation, which determines the accuracy of the estimated resource amount. [0003] In the past, there were many methods on the recovery coefficient of organic carbon, such as thermal simulation experiment method, natural evolution profile method, material balance method (ineffective carbon conservation and element conservation method), theoretical derivation method (chemical kinetics, numerical simulation method of organic matter evolution law and Graph ...

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Problems solved by technology

[0004] Among them, the thermal simulation experiment method is to select source rocks of the same type of organic matter with low maturity to be heated, measure the amount of hydrocarbon generation and pyrolysis parameters at different evolution stages, and then use them to restore natural high-evolution source rock samples. The disadvantages are The intermediate reaction process is not considered, and the difference between the evolution of vitrinite and the evolution of geological conditions in the thermal simulation process is ignored

[0005] The natural evolution profile method uses source rocks at the same level but at different burial depths to measure the organic carbon content, and then calculates the restoration coefficient of the original organic matter abundance of source rocks with different maturities. Source rock samples are difficult to obtain

[0006] The material balance method considers that the initial mass of the organic parent material before conversion is equal to the sum of the mass of the residual organic parent material and various products after conversion. The H / C and O / C atomic ratios of organic matter and crude oil are used to balance the hydrocarbon generation reaction of organic matter, and the restoration coefficient of the original cracking potential of source rocks is derived. The exact composition of the various products can only be approximated by balancing the equations through mathematical optimization

[0007] Theoretical derivation method (numerical simulation method of organic matter evolution law and graph method) is mainly found in the literature, and has no practical application

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