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Method for calculating organic carbon content of stratum while drilling

A technology of organic carbon content, which is applied in the direction of earthwork drilling, wellbore/well components, etc., can solve the problem of inaccurate organic carbon content in the formation, and achieve the effect of easy operation, simple operation and wide application

Inactive Publication Date: 2015-04-22
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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Problems solved by technology

The invention realizes the calculation of the organic carbon content of the formation while drilling, and solves the problem of inaccurate calculation of the organic carbon content of the formation by using gamma while drilling

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  • Method for calculating organic carbon content of stratum while drilling

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Embodiment Construction

[0023] A method for calculating formation organic carbon content while drilling, comprising: based on the cuttings gamma ray spectrum uranium analysis data and core and cuttings experimental analysis organic carbon content data, an interpretation model is established according to the correlation between the two, according to Interpretation models calculate formation organic carbon content while drilling.

[0024] Described method specifically comprises the steps:

[0025] a. Combining the cuttings gamma ray spectrum uranium analysis data and the core and cuttings experimental analysis data of organic carbon content in the same block;

[0026] b. Establish an explanation model through the correlation analysis of the data;

[0027] c. According to the established interpretation model, the formation organic carbon content is calculated while drilling.

[0028] In the step b, the established interpretation model is as follows:

[0029] Formula 1.

[0030] Such as figur...

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Abstract

The invention discloses a method for calculating organic carbon content of a stratum while drilling. The method for calculating the organic carbon content of the stratum while drilling is based on cutting gamma-ray spectra uranium analysis data and cutting experiment analysis organic carbon content data, an interpretation model is built according to the correlation there-between, and the organic carbon content of the stratum is calculated according to the interpretation model while drilling. The method for calculating the organic carbon content of the stratum while drilling realizes to calculate the organic carbon content of the stratum while drilling and solves the problem that the organic carbon content of the stratum calculated through gamma-ray calculation while drilling is imprecise.

Description

technical field [0001] The invention relates to a method for calculating the organic carbon content of formations while drilling using the analysis data of cuttings gamma ray spectrum uranium, and belongs to the technical field of petroleum and natural gas exploration and development. Background technique [0002] Shale gas is natural gas stored in shale in free and adsorbed states. It is gradually becoming a hot spot in oil and gas exploration. Domestic shale gas horizontal well development is about to be carried out on a large scale. For the interpretation method of shale gas while drilling, for example, the study on the logging response characteristics and identification methods of shale gas reservoirs disclosed in the 18th issue of "Science and Technology Herald" in 2012. [0003] However, due to the low level of domestic shale gas research at present, the evaluation of the main parameter of shale reservoirs—the organic carbon content is not accurate enough. The main pro...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00
CPCE21B49/00
Inventor 唐家琼唐谢庞江平吴萍王滢景静罗利
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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