Prediction method of source rock organic matter maturity under overpressure background
A prediction method and organic matter technology, applied in the field of oil and gas geological exploration, can solve problems such as oil and gas resource evaluation distortion, large differences, and organic matter maturity prediction deviations
Active Publication Date: 2021-07-06
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology
However, in recent years, oil reservoirs with a depth of more than 5000 m or even 6000 m have been discovered at home and abroad, especially in overpressured areas, where the predicted value of the thermal evolution degree of organic matter is quite different from the measured data, which leads to the distortion of oil and gas resource evaluation.
[0006] In order to solve the problem of deviation in the prediction of organic matter maturity under overpressure environment, we have invented a new method for predicting the maturity of organic matter in source rocks under overpressure, which solves the above technical problems
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[0051] In order to make the above and other objects, features and advantages of the present invention more comprehensible, the preferred embodiments are listed below and shown in the accompanying drawings in detail as follows.
[0052] Such as figure 1 as shown, figure 1 It is a flow chart of the method for predicting the organic matter maturity of source rocks under the background of overpressure in the present invention. The prediction method of organic matter maturity of source rocks under this overpressure background mainly includes source rock sample selection, high temperature and high pressure simulation experiments, formula fitting, and actual field application.
[0053] S101, collecting immature and low-mature high-abundance drilling cores and field samples. For outcrops and core samples, the relevant geochemical parameters were measured, and the organic matter abundance, organic matter type, and organic matter maturity were preliminarily evaluated in accordance wit...
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The present invention provides a method for predicting the maturity of organic matter in source rocks under the background of overpressure. The method for predicting the maturity of organic matter in source rocks under the background of overpressure includes: step 1, collecting immature and low-mature high-abundance drilling cores , field samples; Step 2, carry out high-temperature and high-pressure simulation experiments on actual geological samples, and obtain laboratory test data; Step 3, obtain the conversion rate parameters of samples at different thermal evolution degrees by analyzing the laboratory data of rock cores; Step 4, use The least squares method is used to obtain the thermal evolution degree calculation formula coefficient of the actual block; step 5, based on the seismic data of the oil and gas basin and the measured data of the well, the pressure coefficient is obtained by prediction; step 6, the plane distribution characteristics of the thermal evolution degree of organic matter are predicted under the overpressure condition. The prediction method of organic matter maturity of source rocks under the background of overpressure extends the generation and occurrence potential of oil resources, and lays a theoretical foundation for searching for oil and gas resources in deep and ultra-deep layers.
Description
technical field [0001] The invention relates to the technical field of oil and gas geological exploration, in particular to a method for predicting the maturity of organic matter in source rocks under the background of overpressure. Background technique [0002] The hydrocarbon supply range of source rocks effectively controls the distribution and scale of oil and gas reservoirs, and is an important basis for determining the direction of oil and natural gas exploration in a basin. Therefore, predicting the thermal evolution maturity of source rocks has become an important step in predicting oil and gas accumulation conditions in a basin. [0003] The thermal evolution and hydrocarbon generation process of organic matter consists of a series of parallel and continuous reactions, including the degradation of hydrogen-rich kerogen components to generate hydrocarbons, the evolution and hydrocarbon generation of hydrogen-poor kerogen components, thermal cracking of long-chain hydr...
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IPC IPC(8): G01N33/24
CPCG01N33/241
Inventor 郭瑞超赵乐强曾治平秦峰林会喜周涛王超杨成顺马骥贾凡建
Owner CHINA PETROLEUM & CHEM CORP