Method for identifying true or false oil and gas show through three-dimensional quantitative fluorescence

Abstract

A method for identifying true or false oil and gas show through three-dimensional quantitative fluorescence comprises the following steps: 1, establishing a three-dimensional quantitative fluorescence spectrum database of a standard oil sample and a three-dimensional quantitative fluorescence spectrum database of different drilling fluid system common additives; 2, collecting a sample to be identified, and analyzing to obtain the three-dimensional quantitative fluorescence spectra, of the sample to be identified; 3, going to step 4 if spectrum characteristic abnormality appears in the three-dimensional quantitative fluorescence spectrum of the sample to be identified, and returning to step 2 if not; and 4, comparing the three dimensional quantitative fluorescence spectrum of the sample to be identified with the three-dimensional quantitative fluorescence spectrum database of the standard oil sample, determining as true oil and gas show if the spectrum characteristic abnormality of the sample to be identified is the fluorescence characteristic of the standard oil sample, and comparing three dimensional quantitative fluorescence spectrum of the sample to be identified with the three-dimensional quantitative fluorescence spectrum database of the different drilling fluid system common additives and determining false show caused by which one of the drilling fluid additives if the oil and gas display is false. The method improves the determination accuracy and coincidence rate of onsite true or false oil and gas shows.

Description

technical field [0001] The invention relates to the technical field of petroleum exploration geological logging interpretation and evaluation, in particular to a method for three-dimensional quantitative fluorescence identification of true and false oil and gas displays. Background technique [0002] The so-called fluorescence means that under the irradiation of ultraviolet rays, the fluorescent molecules in crude oil will absorb some energy, temporarily making the fluorescent molecules reach a high-energy and unstable state, and when these fluorescent molecules return to the original state from the unstable state, they will be in the form of The excess energy is released in the form of light waves, a property of oil called fluorescence. In addition to the fluorescence properties of crude oil, many organic substances also have this property. Three-dimensional quantitative fluorescence logging technology is to irradiate samples (including any one or more of rock core, wall c...

AI Technical Summary

Problems solved by technology

The naked eye judges the true and false oil and gas display under the fluorescent lamp, mainly based on the field work experience, the fluorescent color and the dripping situation to judge whether it is the oil and gas display, or the mineral fluorescence or the mud additive fluorescence. For example, the field experience believes that the fluorescent color of quartz is white-gray, calcite The fluorescent color is yellow-bright yellow, and the fluorescent color of gypsum is sky blue or milky white, and the judgment accuracy is low

The analysis data of two-dimensional quantitative fluorescence logging technology (QFT) is greatly affected by the operation of field operators (the amount of samples selected by the operator, the length of soaking time, etc.), and for some formation pollution, drilling fluid mixed with oil and various organic It is difficult to identify additives, weak oil and gas shows, etc.

At present, the method of identifying true and false oil and gas shows is highly empirical and subjective, and the accuracy is low, which is easy to misjudgment

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