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Method for classifying storage spaces of compact reservoir and conventional reservoir

A technology for tight reservoirs and classification methods, applied in the direction of suspension and porous material analysis, analytical materials, permeability/surface area analysis, etc., to achieve the effect of low cost and easy operation

Active Publication Date: 2018-05-29
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Claims
  • Application Information

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Problems solved by technology

The classification and optimization of tight oil reservoir space is one of the important references for evaluating tight oil "sweet spot" areas, and there are few literature reports on the classification of tight reservoir space through pore structure

Method used

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  • Method for classifying storage spaces of compact reservoir and conventional reservoir
  • Method for classifying storage spaces of compact reservoir and conventional reservoir
  • Method for classifying storage spaces of compact reservoir and conventional reservoir

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Embodiment 1

[0017] Embodiment 1: as figure 1 Said, a method for classifying storage space of tight reservoirs and conventional reservoirs, comprising the following steps;

[0018] Step 1: Perform porosity, permeability and mercury intrusion experiments on 30 samples of reservoirs in the target section of the study area, and obtain the porosity, permeability and the volume of connected pores between pores and throats of different pore sizes in the sample volume. The results are shown in Table 1.

[0019] Table 1

[0020]

[0021] Step 2: Calculate the ratio of the pore diameter range of 1000nm pore-throat connected pore volume to the sample volume percentage and the porosity value, and obtain the pore diameter range of 1000nm pores -The percentage of the pore volume connected by the throat to the total pore volume, the results are shown in Table 2.

[0022] Table 2

[0023]

[0024] Step 3: use the pore diameter range 1000nm pore-throat connected pore volume percentage of the tot...

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Abstract

The invention relates to a method for classifying storage spaces of a compact reservoir and a conventional reservoir, and belongs to the field of oil exploration. The method can be used for classifying the storage spaces of the compact reservoir and the conventional reservoir, and comprises the steps as follows: performing porosity, permeability and mercury injection experiments on reservoir samples of target intervals in research areas; based on experimental analysis results of porosity and mercury injection, determining the porosity value, permeability value and pore size of the samples to be in ranges of being smaller than 100 nm, 100-1000 nm and larger than 1000 nm respectively according to the percentage of the hole-throat communication pore volume accounting for the total pore volume; drawing a crossplot of the percentage of the hole-throat communication pore volume accounting for the total pore volume in the three pore size ranges with porosity and permeability respectively, anddetermining an inflection point and an intersection point of the percentage of the hole-throat communication pore volume accounting for the total pore volume of holes in each pore size range with change trend lines of porosity and permeability; classifying the reservoir storage spaces of the target intervals according to the porosity and permeability value corresponding to the inflection point and intersection point.

Description

technical field [0001] The invention relates to a storage space classification method for tight reservoirs and conventional reservoirs, belonging to the technical field of petroleum exploration and development. Background technique [0002] Tight oil exists widely in oil and gas basins around the world, and is another hot spot for unconventional oil and gas exploration and development after shale gas. Like unconventional oil and gas resources such as coalbed methane, tight gas, and shale gas, tight oil is becoming more and more popular among petroleum geologists. attention. Tight oil refers to oil that exists in source rocks in an adsorbed or free state, or interbeds with source rocks, or in tight sandstones, tight carbonate rocks, and other reservoir rocks that have not undergone large-scale long-distance migration. Oil gathers. The oiliness of tight oil reservoirs has strong heterogeneity, how to select tight oil "sweet spot" areas more effectively and quickly has become...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08
CPCG01N15/08G01N15/088
Inventor 陈方文卢双舫丁雪薛海涛李吉君王民王伟明黄文彪肖佃师
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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