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Method and system for determining total organic carbon content

A technology of total organic carbon content and thorium content is applied in the system field of determining total organic carbon content and determining total organic carbon content, achieving the effect of strong practicability and versatility, and enriching organic matter evaluation methods

Active Publication Date: 2017-01-04
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0005] Aiming at the problems existing in TOC evaluation of existing complex shale gas reservoirs, the present invention proposes a method and system for determining the total organic carbon content based on the natural radioactivity of rocks and nuclear logging principles

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  • Method and system for determining total organic carbon content
  • Method and system for determining total organic carbon content
  • Method and system for determining total organic carbon content

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[0064] The implementation of the present invention will be described in detail below in conjunction with the accompanying drawings and examples, so as to fully understand and implement the process of how to apply technical means to solve technical problems and achieve technical effects in the present invention. It should be noted that, as long as there is no conflict, each embodiment and each feature in each embodiment of the present invention can be combined with each other, and the formed technical solutions are all within the protection scope of the present invention.

[0065] Aiming at the problems existing in TOC evaluation of existing complex shale gas reservoirs, the embodiment of the present invention proposes a method for determining the total organic carbon content based on the principle of natural radioactivity of rocks and nuclear logging.

[0066] Such as figure 1 Shown is a schematic flow chart of the method for determining the total organic carbon content of the...

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Abstract

The invention discloses a method and system for determining total organic carbon content. The method comprises the steps that a total gamma intensity curve, a uranium-removing gamma intensity curve, a thorium content curve and a uranium content curve are obtained; the total gamma intensity curve and the uranium-removing gamma intensity curve are overlapped and a rich organic matter well section is recognized; for each down-hole sampling point of the rich organic matter well section, separation degrees of the overlapped total gamma intensity curve and the uranium-removing gamma intensity curve at the down-hole sampling point are calculated; the ratio of thorium and uranium of the thorium content curve and the uranium content curve at the down-hole sampling point is calculated; and according to the separation degree and the ratios of thorium and uranium, the total organic carbon content of each down-hole sampling point in the rich organic matter well section is determined. The method and the system for determining the total organic carbon content is high in practicality and universality, enriches the organic matter evaluating method for abnormal shale reservoir stratums, and provides an efficient technical means for the organic carbon content quantitative evaluation of rich organic matter rocks not suitable for a traditional organic matter evaluating method in complex geological conditions.

Description

technical field [0001] The invention relates to the technical field of unconventional oil and gas exploration and development, in particular to a method for determining the total organic carbon content, and also to a system for determining the total organic carbon content. Background technique [0002] Identifying and evaluating the total organic carbon content (Total Organic Carbon, TOC) in organic-rich shale based on well logging data is an important content in the field of oil and gas exploration. For unconventional shale gas reservoirs, TOC evaluation is the core element of refined evaluation of exploration and development. At present, referring to the relatively mature TOC evaluation method of organic-rich rocks (hydrocarbon source rocks), TOC logging evaluation of shale gas reservoirs is carried out. The methods are mainly divided into two categories: geostatistical method and empirical formula method. Under some special geological conditions, it is difficult to apply...

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Application Information

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IPC IPC(8): E21B47/00E21B49/00
Inventor 路菁李军武清钊张军苏俊磊郝士博南泽宇
Owner CHINA PETROLEUM & CHEM CORP
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