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Ancient oil-water interface recognition method and application thereof in reestablishment of crude oil charging history

An oil-water interface and identification method technology, applied in the field of element geochemistry, oil and gas exploration, can solve the problems of large human factors, limitations, limited scope of observation and statistics, etc., and achieve the effects of high sensitivity, wide promotion and high accuracy

Active Publication Date: 2017-12-08
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is labor-intensive, requires professional skills in identifying inclusions, has a lot of human factors, and the scope of observation and statistics is limited, making it difficult to reflect the overall picture of the reservoir
Reservoir Quantitative Fluorescence Technology (QGF-E) is based on the detection of organic molecules (such as aromatic hydrocarbons, polar organic compounds and bitumen), which may be damaged (such as high temperature Secondary cracking of the lower oil), resulting in the inability to identify the oil-water interface or inaccurate identification, which limits the method to a certain extent

Method used

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  • Ancient oil-water interface recognition method and application thereof in reestablishment of crude oil charging history
  • Ancient oil-water interface recognition method and application thereof in reestablishment of crude oil charging history
  • Ancient oil-water interface recognition method and application thereof in reestablishment of crude oil charging history

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Experimental program
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Effect test

Embodiment 1

[0045] The Dampier Basin on the Northwest Continental Shelf of Australia was selected as the research area to identify the paleo-oil-water contact of oil and gas reservoirs, including the following steps:

[0046] (1) A single well drilled in the basin encountered a Cretaceous sandstone reservoir to obtain a sample of the reservoir. The sampling position extends from the top of the Cretaceous reservoir to the middle of the known water layer below, and the interval between the sampling points is 5 -10m, a total of 7 sampling points, numbered sequentially, record the depth corresponding to the sampling point, the data is shown in Table 1. It should be noted that when sampling, about 20g of core samples are selected as reservoir samples, and when there are no core samples, 20-50g of cuttings samples are selected as reservoir samples.

[0047] Table 1 Statistics of Cretaceous sandstone reservoirs drilled in Dampier Basin, Northwest Continental Shelf, Australia

[0048]

[0049...

Embodiment 2

[0058] The Tazhong area of ​​the Tarim Basin is selected as the research area to identify the paleo-oil-water contact of oil and gas reservoirs, including the following steps:

[0059](1) A single well drilled in this area encountered Silurian asphaltic sandstone reservoirs and systematically sampled to obtain reservoir samples. The sampling position extended from the top of the Silurian to the middle of the water layer below the asphaltic sands. The sampling point The interval distance is 2-10m, a total of 17 sampling points are numbered sequentially, and the depths corresponding to the sampling points are recorded. The data are shown in Table 2. It should be noted that when sampling, about 20g of core samples are selected as reservoir samples, and when there are no core samples, 20-50g of cuttings samples are selected as reservoir samples.

[0060] Table 2 Statistics of Silurian sandstone reservoirs drilled in the Tazhong area of ​​the Tarim Basin

[0061]

[0062] (2) O...

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Abstract

The invention discloses an ancient oil-water interface recognition method and application thereof in the reestablishment of a crude oil charging history. According to the ancient oil-water interface recognition method, an ancient oil-water interface of oil and gas reservoirs can be rapidly and accurately recognized, and therefore, the crude oil charging history is reestablished. The ancient oil-water interface recognition method comprises the following steps: sampling different depth positions of a reservoir targeted formation of a single well in a research area so as to obtain reservoir samples, and recording corresponding depths of sampling points; acquiring adsorbed hydrocarbon extracts on the surfaces of reservoir sample particles, and determining the contents of trace elements in the adsorbed hydrocarbon extracts; drawing a distribution profile map of the content of the trace elements along the depthaccording to the depths of the sampling points and the data of the trace element content of adsorbed hydrocarbon on the surfaces of the corresponding reservoir sample particles; and recognizing an inflection point where the trace element content starts to continuously deviate from a base line in the map along the depths of the sampling points from large to small according to the distribution profile map, wherein the depth corresponding to the inflection point is the depth of the ancient oil-water interface of the oil and gas reservoirs.

Description

technical field [0001] The invention relates to the field of petroleum and natural gas exploration, in particular to the field of elemental geochemistry (oil and gas accumulation), in particular to a method for identifying ancient oil-water interfaces in oil and gas reservoirs and its application in reconstructing the history of crude oil charging. Background technique [0002] The study of oil and gas accumulation history is an important part of the study of oil and gas accumulation laws. Through the study of crude oil charging history, combined with the source rock evolution and structural analysis during the charging period, we can better understand the formation process and main Controlling factors to help better predict the location and properties of oil and gas reservoirs during this period. The change of oil-water contact in oil and gas reservoirs records the history of adjustment, transformation and destruction of oil and gas reservoirs after formation. By restoring...

Claims

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Application Information

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IPC IPC(8): G01N27/62G01N1/28G01N1/34G01N1/44
CPCG01N1/28G01N1/34G01N1/44G01N27/626
Inventor 刘可禹武鲁亚庞雄奇刘建良杨鹏葸克来
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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