A Method of Calculating Mud Content of Formation Containing Radioactive Substances by Combining Gr and Sp

A technology for radioactive material and shale content, which is applied to the calculation formula of shale content, the interpretation of geophysical logging in mines, and the calculation of shale content of radioactive material-bearing formations. problems such as narrow range, to achieve the effect of ensuring resolution and accurate calculation

Active Publication Date: 2020-06-23
RES INST OF SHAANXI YANCHANG PETROLEUM GRP
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  • Application Information

AI Technical Summary

Problems solved by technology

The calculation of shale content has always been calculated by GR and SP single curves, and the GR curve indicating the shale content is commonly used. When the formation contains radioactive substances, GR can no longer indicate the shale content accurately. In this case, One is to use other curves to calculate the shale content, but the shale content calculated by other curves is not accurate enough; the other is to use the experimental analysis data to fit the logging curve, and the fitted shale content interpretation model is only applicable to the area where the experimental analysis data is located. block
Although these methods solve the calculation problem of shale content, the accuracy is not enough or the scope of application is narrow

Method used

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  • A Method of Calculating Mud Content of Formation Containing Radioactive Substances by Combining Gr and Sp
  • A Method of Calculating Mud Content of Formation Containing Radioactive Substances by Combining Gr and Sp

Examples

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Effect test

example 1

[0019] In a well in the Wuqi area of ​​Yanchang Oilfield, 1666.59-1666.73 meters is a small section of a sand body, the GR reading value is 68API, and the SP reading value is 48mV. Through the analysis of the upper and lower sections, the GR max 140API, GR min 55API, SP max 80mV, SP min It is 35mV, and the lithology analysis data shows that the shale content in this depth section is 11.7%. The calculation result of the newly invented shale content calculation formula is 15.6%. The difference between the calculation result and the lithology analysis result is 3.9%. within range.

example 2

[0021] In a well in Dingbian of Yanchang Oilfield, the oil-bearing section of the target layer contains radioactive substances, and the GR value is relatively high. A depth point is selected in this layer, and the logging GR reading value is 98API, and the SP reading value is 55mV. Through the analysis of the upper and lower sections, the GR value is determined respectively. max 140API, GR min 70 API, SP max 89mV, SP min The shale content obtained by the lithology analysis of this section is 6.14%, and the shale content calculated by the newly invented formula is 7.7%. The calculation result is close to the lithology analysis result, and the difference between the two is only 1.56%. within the required range.

example 3

[0023] For a well in an oilfield in China, because the oil-bearing interval contains radioactive substances, energy spectrum GR logging was selected in the logging series. A depth point was selected in this layer, and the logging GR reading value was 89API, and the SP reading value was 10mV. Through the analysis of the upper and lower sections , respectively determine the GR max 135 API, GR min 70 API, SP max 30mV, SP min The shale content of this section is 17.8% according to the core analysis, and the shale content calculated by the newly invented formula is 19.3%. The calculation result is consistent with the core analysis result, and the difference between the two is 1.5%, which is within the required range of the interpretation standard .

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Abstract

The invention relates to a method for calculating the mud content of the layer containing the radioactive material by combining GR and SP, belongs to the mine geophysical logging interpretation technology, The invention specifically relates to a method for calculating mud content of layer containing radioactive material, and is directed to a formula for calculating the mud content in the case where the mud content is not suitable for the GR calculation. The method comprising the following steps: (1) calculating the mud index SH(i)1( / i) of GR; (2) calculating the mud index SH(i)2( / i) of SP; (3)determining a comprehensive mud index SH; (4) calculating the mud content of the layer. The invention provides a method for calculating the mud content of the layer containing the radioactive material by combining GR and SP, and overcomes the problem that conventional GR interpretation model is not applicable when radioactive material is present in the layer.

Description

technical field [0001] The invention relates to a method for combining GR and SP to calculate the shale content of formations containing radioactive substances, which belongs to the field geophysical logging interpretation technology, specifically a method for calculating the shale content of formations containing radioactive substances. The shale content calculation formula is suitable for GR calculation of shale content. Background technique [0002] In the interpretation of logging data, the interpretation of formation shale content is an indispensable parameter for calculating formation effective porosity, permeability and formation oil saturation. The calculation of shale content has always been calculated by GR and SP single curves. The GR curve indicating the shale content is commonly used. When the formation contains radioactive substances, GR can no longer indicate the shale content accurately. In this case, One is to use other curves to calculate the shale content...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01T1/167
CPCG01T1/167
Inventor 王振华党海龙张亮奥洋洋吴长辉庞振宇白璞王继超葛红选谢旭强
Owner RES INST OF SHAANXI YANCHANG PETROLEUM GRP
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