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Laboratory measurement method for electrical properties of shale in longmaxi formation in Pingqiao region

A technology of electrical properties and measurement methods, applied in the field of oil and gas experiments, can solve the problems of difficult analysis and experimental work, core fracture, high permeability and brittleness

Inactive Publication Date: 2021-08-06
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

However, due to the deep buried reservoir and compact lithology of shale rocks, the core samples have the characteristics of low porosity, low permeability and high brittleness. The centrifugation method may lead to core rupture, which cannot be processed by the traditional displacement and desaturation method. bring great difficulty

Method used

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Embodiment Construction

[0031] A laboratory measurement method for electrical properties of Longmaxi Formation shale in Pingqiao area, comprising the following steps:

[0032] Step 1), vacuumize the solution chamber and the rock core chamber;

[0033] First vacuumize the solution chamber containing saturated brine until the pressure in the solution chamber containing saturated brine drops to -0.1MPa, continue vacuuming for 3 hours and then stop; vacuumize the rock sample chamber containing rock samples, and the rock sample chamber The pressure will drop to -0.1MPa, continue vacuuming for 2h~4h;

[0034] Then open the valve between the solution chamber and the rock sample chamber, let the saturated brine enter the rock sample chamber, and continue to vacuumize at the same time, after the salt water has submerged the rock sample in the rock sample chamber, continue to vacuum the rock sample chamber for 1 hour and then stop;

[0035] Step 2), self-absorption saturation method and measure the core resis...

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Abstract

The invention relates to a laboratory measurement method for electrical properties of shale in a longmaxi formation in a Pingqiao region. The laboratory measurement method comprises the following steps: step 1), vacuumizing a solution chamber and a rock core chamber; 2) measuring the core resistivity of the rock sample by a self-absorption saturation method; (3) measuring the core resistivity of the rock sample by using a pressurization saturation method; and recording the resistivity under the saturation condition of each rock sample, and calculating resistivity parameters. Compared with a traditional mode, on the basis that the shale core is not damaged, the resistance of the rock under various saturation conditions in the rising saturation process is measured till the rock sample reaches the ultimate saturation state. The volume and the resistance of the sucked solution are recorded, and finally rock resistivity parameters, namely a formation factor a, a pore cementation index m and a saturation index n are obtained, and shale resistivity parameters are effectively obtained.

Description

technical field [0001] The invention relates to a laboratory measurement method for the electrical properties of Longmaxi Formation shale in Pingqiao area, belonging to the unconventional oil and gas development plan in the petroleum industry and the technical field of oil and gas experiments. Background technique [0002] my country is rich in tight rock reserves and has great economic value, but there are few studies on the laboratory measurement standards of tight rock resistivity in China, and there is no unified and mature method for reference. It is particularly important to establish and apply a set of experimental standards suitable for tight rock resistivity measurement to evaluate tight rock reservoirs. [0003] The current rock resistivity measurement standard is "Laboratory Measurement and Calculation Methods of Rock Resistivity Parameters" (SYT5385-2007), which is applicable to the determination of consolidated or weakly cemented sandstone cores, and the shale r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12
CPCG01N27/12
Inventor 曾隽易明华高玉巧丁安徐胡微雪高和群陈佳聂军陈云燕李小越杨媛媛张婷婷许方玉任祖慧
Owner CHINA PETROLEUM & CHEM CORP
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