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

A three-dimensional quantitative and fluorescence identification technology, applied in the direction of fluorescence/phosphorescence, material excitation analysis, etc., can solve the problems of identification difficulties such as weak oil and gas display, large influence of analysis data operation, and low judgment accuracy, so as to achieve objective and good judgment results. Application prospects, the effect of eliminating the influence of human factors

Inactive Publication Date: 2014-11-05
CHINA NAT OFFSHORE OIL CORP +1
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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
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  • Method for identifying true or false oil and gas show through three-dimensional quantitative fluorescence
  • Method for identifying true or false oil and gas show through three-dimensional quantitative fluorescence
  • Method for identifying true or false oil and gas show through three-dimensional quantitative fluorescence

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example 1

[0036] Example 1: Well JZ*-*-* in Jinzhou was drilled to depths of 1245m, 1255m and 1260m, and there were no obvious peaks in the three-dimensional quantitative fluorescence spectrum of cuttings, as shown in Figure 6a , 6d As shown in and 6e, at a well depth of 1250m, the three-dimensional quantitative fluorescence spectrum of cuttings has a relatively obvious peak, as shown in Figure 6b As shown, by comparing the three-dimensional quantitative fluorescence spectrum library of drilling fluid additives, with such Figure 6c The solid graphite peak position and map shape shown are similar, and the three-dimensional quantitative fluorescence logging judges that it is an anomaly caused by solid graphite, not formation oil and gas shows. Finally, through gas logging and fluorescence scanning mud logging, no abnormal oil and gas shows were found, which verified the correct judgment of 3D quantitative fluorescence mud logging.

example 2

[0037] Example 2: Well Lvda LD*-*-* was drilled and cored to a depth of 1221.4m, and the three-dimensional quantitative fluorescence spectrum of the core sample showed a relatively obvious peak, as shown in Figure 7b as shown, with Figure 7a The peak positions of the standard oil samples shown are different. Compared with the three-dimensional quantitative fluorescence spectrum library of drilling fluid additives, the results are as follows: Figure 7c The emulsified paraffin peak position and the shape of the spectrum shown are similar, and the three-dimensional quantitative fluorescence judges that the fluorescence display caused by the emulsified paraffin is abnormal. Finally, through drilling coring and fluorescence scanning mud logging, no abnormal oil and gas shows were found, which verified the correct judgment of 3D quantitative fluorescence mud logging.

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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...

Claims

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Application Information

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IPC IPC(8): G01N21/64
Inventor 尚锁贵胡云谭忠健罗鹏马猛苑仁国吴立伟郭明宇
Owner CHINA NAT OFFSHORE OIL CORP
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