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Method and device for calculating organic carbon content in source rock

A source rock and organic carbon technology, applied in the field of calculating organic carbon content in source rocks, can solve problems such as reducing calculation accuracy

Active Publication Date: 2017-10-17
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] For rock formations with complex lithology, since the acoustic transit time logging curve and resistivity logging curve are affected by lithology, oil and gas content and pore structure, the calculation accuracy is reduced when calculating the organic carbon content according to the above method

Method used

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  • Method and device for calculating organic carbon content in source rock
  • Method and device for calculating organic carbon content in source rock
  • Method and device for calculating organic carbon content in source rock

Examples

Experimental program
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Embodiment 1

[0065] figure 1 It is a flow chart of a method for calculating organic carbon content in source rocks provided by an embodiment of the present invention. see figure 1 , the method includes:

[0066] Step 101: Calculate a first shale content indication according to the spontaneous potential logging curve.

[0067] Step 102: Calculate a second shale content indication according to the natural gamma ray logging curve.

[0068] Step 103: Calculate the lithology index of the sand-shale according to the neutron logging curve, the density logging curve and the sonic transit time logging curve.

[0069] Step 104: According to the first shale content indication, the second shale content indication and the lithology index, identify source rocks from sandy mudstone.

[0070] Step 105: Calculate the organic carbon content in the source rock according to the density logging curve, the sonic transit time logging curve and the resistivity logging curve.

[0071] In the embodiment of the...

Embodiment 2

[0091] figure 2 It is a flowchart of a method for calculating the organic carbon content in source rocks provided by the embodiments of the present invention. see figure 2 , the method includes:

[0092] Step 201: Calculate a first shale content indication according to the spontaneous potential logging curve.

[0093] Specifically, according to the spontaneous potential logging curve, the first shale content indication is calculated according to the following formula (1);

[0094]

[0095] Wherein, in above-mentioned formula (1), I SP is the first shale content indicator, SP max is the magnitude of spontaneous potential on pure sandstone, SP min is the baseline value of the spontaneous potential on the mudstone layer, and SP is the spontaneous potential logging value on the logging curve of the spontaneous potential. Additionally, when I SP When the value is larger, it indicates that the shale content in the rock formation is larger, on the contrary, when I SP Sma...

Embodiment 3

[0152] Figure 4 It is a schematic structural diagram of a device for calculating organic carbon content in source rocks provided by the embodiment of the present invention. see Figure 4 , the device includes: a first calculation module 401, a second calculation module 402, a third calculation module 403, an identification module 404 and a fourth calculation module 405;

[0153] The first calculation module 401 is configured to calculate a first shale content indication according to the spontaneous potential logging curve;

[0154] The second calculation module 402 is used to calculate the second shale content indication according to the natural gamma ray logging curve;

[0155] The third calculation module 403 is used to calculate the lithology index of the sand and mudstone according to the neutron logging curve, the density logging curve and the acoustic time difference logging curve;

[0156] The identification module 404 will be used to identify source rocks from sand...

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Abstract

The invention discloses a method and a device for calculating organic carbon content in source rocks, belonging to the field of petroleum geological exploration. The method includes: calculating the first shale content indication according to the natural potential logging curve; calculating the second shale content indication according to the natural gamma ray logging curve; according to the neutron logging curve, density logging curve and acoustic time difference Logging curves, calculating the lithology index of the sand and mudstone; identifying source rocks from the sand and mudstone according to the first shale content indication, the second shale content indication and the lithology index; The density logging curve, the acoustic wave transit time logging curve and the resistivity logging curve are used to calculate the organic carbon content in the source rock. The device includes: a first calculation module, a second calculation module, a third calculation module, an identification module and a fourth calculation module. The invention improves the accuracy of calculating the organic carbon content in the source rock through multiple logging curves.

Description

technical field [0001] The invention relates to the field of petroleum geological exploration, in particular to a method and device for calculating organic carbon content in source rocks. Background technique [0002] Source rocks, also called source rocks, are rocks that are rich in organic matter and produce and discharge oil and gas in large quantities. In order to extract large amounts of oil and gas, it is necessary to accurately identify source rocks. However, the abundance of organic matter is one of the important parameters for evaluating the generation of oil and gas in source rocks, and the content of organic carbon is the main index reflecting the abundance of organic matter in source rocks. Therefore, the method of calculating the content of organic carbon in source rocks has been widely focus on. [0003] At present, the process of calculating the organic carbon content in source rocks is specifically: resistivity logging curves and acoustic time difference lo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F19/00G01V11/00
Inventor 赵贤正沈金松金凤鸣王权师玉雷钟雪梅
Owner PETROCHINA CO LTD