Method for forecasting TOC (Total Organic Carbon) content of shale reservoir stratum

A technology for shale reservoirs and total organic carbon, which is applied in the field of geophysical exploration and can solve the problem of low resolution, undisclosed detailed description and specific details of the quantitative prediction method of TOC content in shale reservoirs, and no quantitative prediction of shale reservoirs. Layer TOC content method and process, etc., to achieve the effect of high prediction accuracy, low cost and comprehensive analysis

Active Publication Date: 2015-02-11
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

However, the sampling interval of VSP logging is generally 5m or even 20m, and its resolution is low, which cannot meet the precision requirements of pre-stack gather elastic parameter inversion.
[0006] To sum up, some results have been achieved in the calculation of TOC content in China, but there is no

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  • Method for forecasting TOC (Total Organic Carbon) content of shale reservoir stratum
  • Method for forecasting TOC (Total Organic Carbon) content of shale reservoir stratum

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[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0020] The invention provides a method for predicting the TOC content of total organic carbon in shale reservoirs, such as figure 1 As shown, the method includes:

[0021] In step S1, based on the TOC content calculation equation of a single well, the TOC content test results of the core of the target interval and the logging data of the shale reservoir work area are used to fit the TOC content curve of the single well.

[0022] Specifically...

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Abstract

The invention provides a method for forecasting a TOC (Total Organic Carbon) content of a shale reservoir stratum. The method comprises the following steps: fitting a single well TOC content curve on the basis of a single well TOC content calculating equation; calculating a single well elastic parameter curve; establishing a relevance equation between the TOC content and the elastic parameter according to a crossing condition of the single well TOC content curve and the single well elastic parameter curve; inverting the elastic parameter on the basis of a three-dimensional earthquake pre-stack channel gathering elastic parameter inverting method; converting the inverted elastic parameter into TOC content data according to the relevance equation between the TOC content and the elastic parameter; applying the TOC content data and forecasting the TOC content horizontal distribution along a target layer of the shale reservoir stratum. According to the invention, the logging information, VSP logging achievement and three-dimensional earthquake data are comprehensively applied for quantitatively forecasting the TOC content horizontal distribution, so that the horizontal distribution of the TOC content in the shale reservoir stratum can be accurately evaluated. The method has the advantages of complete analysis, higher forecasting accuracy, lower cost, and the like.

Description

Technical field [0001] The invention relates to the technical field of applied geophysical prospecting, in particular to a method for predicting the TOC content of total organic carbon in shale reservoirs. Background technique [0002] Conventional Total Organic Carbon (TOC) content evaluation methods mainly have two forms. One is to use the laboratory test results of core sample data to evaluate the TOC content of the reservoir section. Although this method has high accuracy, it can only Obtain the TOC content at some specific points; the second is to use empirical formulas to calculate the TOC content through logging data to evaluate the target interval of the reservoir. This method can obtain the TOC content curve of the entire target interval, but it cannot describe the TOC content The plane distribution. In addition, the domestic use of logging data to calculate TOC content is mainly the ΔLgR method and some deformation methods. The ΔLgR method is to calculate the TOC cont...

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Application Information

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IPC IPC(8): G01V1/40
Inventor 金其虎万小平梁雪莉刘本晶刘伟程飞郭锐
Owner BC P INC CHINA NAT PETROLEUM CORP
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