Prediction method and device for physical property parameters of effective hydrocarbon source rock

Abstract

The invention provides a prediction method and device for physical property parameters of effective hydrocarbon source rock. The method comprises the following steps: acquiring the total organic carbon content, vitrinite reflectivity and hydrogen index of to-be-detected effective hydrocarbon source rocks; establishing an original hydrocarbon generation capability prediction model, and obtaining the original hydrocarbon generation capability of the effective hydrocarbon source rock to be tested by utilizing the original hydrocarbon generation capability prediction model according to the total organic carbon content, the vitrinite reflectivity and the hydrogen index of the effective hydrocarbon source rock to be tested; and establishing an effective hydrocarbon source rock physical property parameter prediction model, and obtaining physical property parameters of the effective hydrocarbon source rock to be measured according to the original hydrocarbon generation capacity of the effective hydrocarbon source rock to be measured and the effective hydrocarbon source rock physical property parameter prediction model, wherein the physical property parameters comprise the oil gas discharge amount and / or the total organic carbon content lower limit value. The method and device provided by the invention can realize quantitative prediction of the oil and gas discharge amount of the effective hydrocarbon source rock and / or quantitative evaluation of the TOC lower limit value of the effective hydrocarbon source rock, and improve the prediction precision and efficiency of oil and gas resources and favorable zones.

Description

technical field [0001] The invention relates to a method and device for predicting physical parameters of effective hydrocarbon source rocks, belonging to the technical field of oil and gas exploration. Background technique [0002] Conventional oil and gas reservoirs are formed after the oil and gas generated by source rocks are expelled, migrated and accumulated. Effective source rocks refer to rock formations that have both oil and gas generation and oil and gas discharge. Effective source rocks are the basis for evaluating conventional oil and gas resources and favorable zones, and only in areas where effective source rocks are developed can accumulation be possible. Effective source rocks are controlled by TOC, vitrinite reflectance Ro, and hydrogen index HI. Only source rocks with certain TOC and HI undergo certain thermal evolution can become effective source rocks. At present, the evaluation of the hydrocarbon expulsion of source rocks is based on the thermal simula...

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Problems solved by technology

[0005] In the prior art, the three schemes for evaluating the amount of oil and gas expelled from source rocks all have defects: 1. The amount of expelled oil and gas is calculated by using the total amount of generated oil and gas obtained by thermal simulation, but most source rocks in oil and gas-bearing basins have experienced After a certain thermal evolution, a certain amount of oil and gas is generated or discharged, and it is difficult to obtain the total amount of oil and gas generated by source rocks. Therefore, it is impossible to accurately obtain the amount of oil and gas emitted by source rocks.

2. The open system simulation experiment cannot be pressurized, cannot simulate the actual formation conditions, the sample size is small, the error is large, the temperature rises quickly, and it cannot truly reflect the thermal maturity process of the source rocks, and the discharge process of the source rocks under the formation conditions cannot be obtained. The obtained discharge oil and gas volume has a large error

3. The simulation experiment of high temperature and high pressure hydrocarbon generation and expulsion in a semi-open system uses crushed loose samples, in which there is a large space in the sample, and the amount of retained oil and gas obtained is inaccurate, which cannot truly reflect the thermal maturity of source rocks under formation conditions During the process, the amount of retained oil and gas and the amount of removed oil and gas did not realize variable pressure to obtain data, and it was impossible to truly obtain the evaluation of the amount of oil and gas discharged from source rocks

[0006] The two schemes for predicting the lower limit of TOC of effective source rocks in the prior art have defects. First, using the hydrocarbon generation potential method and the material balance method to carry out numerical simulation to obtain the lower limit of TOC of effective source rocks requires accurate hydrocarbon generation , hydrocarbon expulsion model, but it cannot be provided in reality, so there is a large error in the lower limit of effective source rock TOC

2. S obtained from source rock core samples 1 and TOC values, using S 1 The point where / TOC no longer increases determines the lower limit of effective source rock TOC. Oil and gas are lost during source rock core acquisition and experimentation, so the lower limit of effective source rock TOC is inaccurate

[0007] In summary, the existing prediction schemes for the amount of oil and gas expelled from source rocks cannot quantitatively predict the amount of oil and gas expelled from source rocks, and the existing methods for determining the lower limit of TOC of effective source rocks cannot accurately and quantitatively evaluate the lower limit of TOC of effective source rocks

For the above problems, no effective solution has been proposed

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