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Method and model for quickly judging sandstone reservoir fluid properties

A technology for reservoir fluid properties and sandstone, which can be used in earth-moving drilling, instruments, wellbore/well components, etc., and can solve the problem of inconvenient on-site identification of fluid properties.

Active Publication Date: 2020-10-16
SHAANXI YANCHANG PETROLEUM GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the inconvenient on-site judgment of fluid properties existing in the prior art and the defect of judging the fluid properties of tight sandstone reservoirs, and propose a method for judging the fluid properties of reservoirs by using the combined amplification of compensation sound waves, resistivity and natural potential amplitude difference A simple and fast model for judging reservoir fluid properties is established

Method used

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  • Method and model for quickly judging sandstone reservoir fluid properties
  • Method and model for quickly judging sandstone reservoir fluid properties
  • Method and model for quickly judging sandstone reservoir fluid properties

Examples

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Effect test

Embodiment 1

[0043] For a well in Zhongyuan Oilfield, the depth of the standard water layer is 2491.2m-2494.0m, the average value of the standard water layer compensation sound wave is 282us / m, the standard water layer resistivity value is 0.33Ω.m, and the standard water layer natural potential amplitude difference is 73.4mv , the cut-off index value of the oil layer is 7.2, and the depth of the target layer is 2440.0m-2485.0m. The calculation results of the judgment model of the fluid properties of the target layer reservoir by the present invention show that see figure 1 , if it is greater than the cut-off value, it means that the reservoir contains oil, and the result is that the oil layer and the oil-water layer are not equal. The No. 11 and No. 14 layers were put into production in this well, with a daily oil production of 8.7 tons and water of 0.3 cubic meters, which are oil layers. The identification results are consistent with the production results, which shows the accuracy of the ...

Embodiment 2

[0045] A well in Yanchang Oilfield has 2 long sections. The depth of the standard water layer is 894.0m-912.0m, the average value of the standard water layer compensation sound wave is 248.7us / m, the resistivity value of the standard water layer is 10Ω.m, the natural potential amplitude difference of the standard water layer is 25.6mv, and the cut-off The index value is 2.5, the depth of the target interval is 880.5m-890m, the mud logging shows as oil traces, and on the logging curve, the resistivity value is obviously higher than the value of the standard water layer, and the fluid passing through the target interval reservoir of the present invention The calculation results of the judgment model of the properties are shown, see figure 2 , the discriminant index of the target interval is less than the cut-off index, and it is judged that the reservoir is a water layer. The perforation section of the well is 883.0-887.0m, the fracturing is put into production, the oil product...

Embodiment 3

[0047] The target layer of a well is a tight sandstone reservoir, and the characteristics of the standard water layer are not obvious. The lowermost water layer is selected to replace the standard water layer. The depth of the standard water layer is 1697.3m-1704.0m, and the average value of the standard water layer compensation sound wave is 235us / m , the resistivity value of the standard water layer is 31.1Ω.m, the natural potential amplitude difference of the standard water layer is 5.5mv, the oil-water layer cut-off index value is 2.5, the depth of the target layer is 1671.0m-1697.3m, and the mud logging shows oil traces , on the logging curve, the resistivity value is slightly higher than the value of the standard water layer, and the calculation results of the judgment model of the fluid properties of the target interval reservoir by the present invention show that see image 3 , the reservoir whose discriminant index of the target interval is greater than 2.5 is interprete...

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Abstract

The invention relates to a mine field geophysical well logging field interpretation technology. Specifically, the invention relates to information combination of multiple curves. And finally, well logging characteristics are amplified. The method can be universally applied to discriminating stratum fluid properties. The invention particularly relates to a method and a model for quickly judging sandstone reservoir fluid properties. The method comprises the following steps: reading a compensation sound wave value AC of a target layer and a standard water layer compensation sound wave AC water ofthe same oil-water system through a compensation sound wave logging curve, and calculating an oil-containing characteristic parameter AC / AC water of the target layer by utilizing the read compensation sound wave value AC of the target layer and the standard water layer compensation sound wave value AC water. The invention provides a method for judging reservoir fluid properties by using compensation sound wave, resistivity and natural potential amplitude difference. The method overcomes the problem that the method is not suitable for tight sandstone reservoirs when the formation fluid property is judged only by using a resistivity curve in the past, and also solves the problem that the fluid property is difficult to identify due to resistivity change caused by lithology and physical property change.

Description

technical field [0001] The present invention relates to the on-site interpretation technology of mine geophysical logging, specifically a method of combining multiple curve information and finally amplifying logging features, which can be generally applied to the discrimination of formation fluid properties, including the inability to use resistivity curves alone to distinguish fluids The tight sandstone reservoir of the present invention relates to a method and a model for quickly judging the fluid properties of the sandstone reservoir. Background technique [0002] In the rapid interpretation of well logging field logging data, the rapid identification of fluid properties is the most critical and the ultimate goal. The determination of fluid properties has been directly determined by the resistivity value, but in tight sandstone reservoirs, the resistivity curve can no longer fully reflect the fluid characteristics of the formation. For this situation, one is to use the m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V11/00E21B49/00
CPCG01V11/00E21B49/00Y02A90/30
Inventor 王振华张淑侠安思谨耿龙祥邢云赵倩周康王菲菲陈明奇王苛宇
Owner SHAANXI YANCHANG PETROLEUM GRP
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