Gas logging total hydrocarbon correction method

Abstract

The invention discloses a gas logging total hydrocarbon correction method and belongs to the technical field of oil and natural gas exploration and development. The gas logging total hydrocarbon correction method comprises the following steps that a, correlation analysis is conducted on a gas logging displayed total hydrocarbon value of a regional oil testing section and corresponding testing data, and a correlation formula of the gas logging displayed total hydrocarbon value of the regional oil testing section and the corresponding testing data is built; b, based on the correlation formula, by combining the drill bit size, the drilling liquid displacement, the influence mode of the drill time on gas logging total hydrocarbon and a gas logging total hydrocarbon correction target, a gas logging total hydrocarbon correction model is deduced; and c, a correction value obtained by substituting the regional data into the gas logging total hydrocarbon correction model is subjected to correlation analysis with the corresponding drill bit size, the corresponding drilling liquid displacement and the corresponding drill time, and a gas logging correction formula is obtained. Gas logging total hydrocarbon can be corrected according to the correction method, and responsiveness of gas logging total hydrocarbon for the gas bearing characteristic of a formation is promoted.

Description

technical field [0001] The invention relates to a method for calibrating all hydrocarbons in gas detection. The invention belongs to the technical field of oil and gas exploration and development. Background technique [0002] Gas logging total hydrocarbon is an important parameter for mud logging interpretation, and it is one of the important parameters for judging reservoir physical properties and changes in formation fluid properties on the mud logging site. However, due to the serious influence of gas detection total hydrocarbons by engineering parameters, the response of gas detection total hydrocarbons to reservoir physical properties and formation fluid properties is often deviated. However, the current calibration method for all hydrocarbons in gas measurement is mainly based on empirical formulas, and the calibration model is established by selecting the coefficients of the calibration formulas through statistical analysis or experiments. For example, the authors a...

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Problems solved by technology

[0003] However, this method is affected by many factors such as fixed correction mode and difficult selection of correction formula coefficients, and its application effect is unstable. The main problems are as follows:

[0004] 1. The existing gas measurement correction method is in the semi-quantitative calculation stage, that is, according to the collection principle of gas measurement full hydrocarbons, the influence model of gas measurement influence parameters on gas measurement total hydrocarbons is artificially established, and the artificial factors are too large and inaccurate

[0005] 2. The weight values ​​of each gas measurement influencing parameter in the existing gas measurement correction method are the same, which cannot accurately describe the differences of different gas measurement influencing parameters, resulting in limited model accuracy

[0006] 3. The existing gas logging correction methods basically adopt a linear model when dealing with the influence of engineering parameters such as drilling fluid displacement and drilling time on gas logging and total hydrocarbons. However, mud logging practice shows that the effect should be a more complex function relationship, so the existing method does not match the actual

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