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Method for quantitatively evaluating content of asphalt in ancient carbonate reservoir

A carbonate rock reservoir and bitumen content technology, applied in the field of oil and gas exploration, can solve problems such as the inability to meet the theoretical guidance of exploration, and achieve the effect of accurate calculation and avoidance of representative problems

Inactive Publication Date: 2015-09-30
PETROCHINA CO LTD
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Problems solved by technology

[0004] The application of image recognition principles has become a trend, but in the process of evaluating the current oil and gas resources, only calculating the amount of gas in source rocks according to the traditional method can no longer meet the needs of exploration theory guidance

Method used

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  • Method for quantitatively evaluating content of asphalt in ancient carbonate reservoir
  • Method for quantitatively evaluating content of asphalt in ancient carbonate reservoir
  • Method for quantitatively evaluating content of asphalt in ancient carbonate reservoir

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Embodiment

[0050] This embodiment provides a method for quantitatively evaluating bitumen content in ancient carbonate reservoirs, such as figure 1 shown, including the following steps:

[0051] Step 1. Collect samples of different depths in the vertical range of the ancient carbonate reservoirs in the target interval (mx32 well, mx203 well, mx17 well, mx202 well, mx16 well and mx23 well, etc.) in the central Sichuan paleohigh, such as mx17 well , in the target section of Well mx17, samples were taken between the depths of 4608.2m and 4657.8m, and a carbonate rock sample was taken at intervals of half a meter at different vertical depths. A total of 55 samples were taken from top to bottom, and ground into ordinary thin slices. Use an electron microscope to observe thin slices of carbonate rock reservoirs, randomly select 6 viewing areas for each thin slice of carbonate rocks, and collect images of the viewing areas, such as the carbonate rock collected at a depth of 4636.37m Rock sampl...

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Abstract

The invention provides a method for quantitatively evaluating content of asphalt in an ancient carbonate reservoir. The method comprises the steps that the reservoir of an objective interval is sampled; an acquired carbonate sample is ground into sheets; at least one vision field position is randomly selected for each carbonate sheet; images of the vision field positions are acquired; the acquired images of the vision field positions are analyzed; a distribution pattern of the asphalt in the acquired images of the vision field positions is defined; display of the asphalt is protruded; percentage content of the asphalt in the image of one vision field position is obtained; the percentage content of the asphalt in special depth is obtained according to the obtained percentage content of the asphalt in the image of the one vision field position and by combining randomly acquired pictures in the special depth; the percentage content of the asphalt is counted in a longitudinal direction and in a plane respectively; and a columnar distribution diagram and a plane distribution diagram of the asphalt are drawn. The method for quantitatively evaluating the content of the asphalt in the ancient carbonate reservoir can obtain the content of the asphalt in the ancient carbonate reservoir.

Description

technical field [0001] The invention relates to a method for quantitatively evaluating bitumen content in ancient carbonate rock reservoirs, belonging to the technical field of petroleum and natural gas exploration. Background technique [0002] The distribution of bitumen content in the reservoir is an important condition for studying the distribution of exogenously dispersed liquid hydrocarbons in paleo-reservoirs. Predecessors have done relevant research on the classification of asphalt. The usual way to study bitumen distribution is to count bitumen content and distribution form in carbonate reservoir slices by point counting method. Statistical counting methods based on human factors and experience have relatively large statistical errors, depending on the subjective consciousness of the researcher, and the results are relatively inaccurate. [0003] In recent years, many scholars have begun to introduce graphic recognition technology into the field of petroleum geolo...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/22
Inventor 石书缘胡素云王铜山刘伟李永新姜华徐兆辉黄擎宇
Owner PETROCHINA CO LTD
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