CN113219007A - Laboratory measurement method for electrical properties of shale in Longmaxi group in flat bridge area - Google Patents

Laboratory measurement method for electrical properties of shale in Longmaxi group in flat bridge area Download PDF

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Publication number
CN113219007A
CN113219007A CN202110439897.8A CN202110439897A CN113219007A CN 113219007 A CN113219007 A CN 113219007A CN 202110439897 A CN202110439897 A CN 202110439897A CN 113219007 A CN113219007 A CN 113219007A
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China
Prior art keywords
rock sample
saturation
rock
resistivity
chamber
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CN202110439897.8A
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Chinese (zh)
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
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China Petroleum and Chemical Corp
Sinopec East China Oil and Gas Co
Sinopec East China Co
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China Petroleum and Chemical Corp
Sinopec East China Co
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Priority to CN202110439897.8A priority Critical patent/CN113219007A/en
Publication of CN113219007A publication Critical patent/CN113219007A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
    • G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
    • G01N27/12—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body in dependence upon absorption of a fluid; of a solid body in dependence upon reaction with a fluid, for detecting components in the fluid

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
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  • Pathology (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)

Abstract

The invention relates to a laboratory measurement method for electrical properties of shale in Longmaxi group in flat bridge area, which comprises the following steps: step 1), vacuumizing a solution chamber and a core chamber; step 2), measuring the resistivity of the rock core of the rock sample by a self-absorption saturation method; step 3), pressurizing a saturation method and measuring the resistivity of the rock core of the rock sample; and recording the resistivity of each rock sample under the saturation condition, and calculating a resistivity parameter. Compared with the traditional mode, the method provided by the invention can be used for measuring the resistance of the rock under each saturation condition in the saturation rising process on the basis of not damaging the shale core until the rock sample reaches the limit saturation state. And recording the volume and the resistance of the imbibed solution, and finally obtaining the rock resistivity parameters, namely a formation factor a, a pore cementation index m and a saturation index n, so as to effectively obtain the shale resistivity parameters.

Description

Laboratory measurement method for electrical properties of shale in Longmaxi group in flat bridge area
Technical Field
The invention relates to a laboratory measurement method for electrical properties of shale in Longmaxi group in a flat bridge area, and belongs to the technical field of oil and gas experiments in unconventional oil and gas development schemes in the petroleum industry.
Background
The reserves of the compact rock in China are abundant, the economic value is huge, but the laboratory determination standard of the resistivity of the compact rock is rarely researched in China, and a unified and mature method is not available for reference. A set of experimental standards suitable for the determination of the resistivity of the compact rock is established and applied, and the method is particularly important for evaluating the compact rock reservoir.
The current rock resistivity measurement standard is rock resistivity parameter laboratory measurement and calculation method (SYT5385-2007), the rock resistivity measurement standard is suitable for measuring consolidated or weakly consolidated sandstone cores, and a shale rock resistivity test can only be partially referred to for use.
The resistivity test of the traditional sandstone is a saturation reduction method, a saturated sample is firstly subjected to determination of liquid measurement porosity, then a centrifugal method is used for displacing saturated solution in rock, the core saturation is reduced by gradually increasing the rotating speed of a centrifugal machine, then the resistance of the rock under each saturation condition is measured until a rock sample reaches a bound water state, the volume and the resistance of the solution are recorded and removed, and finally rock resistivity parameters, namely a stratum factor a, a pore cementation index m and a saturation index n are obtained. However, shale rock is deeply buried in a reservoir, lithology is compact, a core sample has the characteristics of low porosity, low permeability, high brittleness and the like, a centrifugal method can cause core fracture, and a traditional displacement saturation reduction method cannot process the core fracture, so that great difficulty is brought to analysis experiment work. In order to improve the integrity of the sample and ensure the smooth development of the experiment, it is necessary to find an effective method for measuring the resistivity of the shale.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a laboratory measurement method for the electrical properties of the shale of the Longmaxi group in the flat bridge area.
The invention aims to realize the purpose, and the laboratory measurement method for the electrical properties of the shale in the Longmaxi group in the flat bridge area is characterized by comprising the following steps of:
step 1), vacuumizing a solution chamber and a core chamber;
(1-1) vacuumizing the solution chamber filled with the saturated saline until the pressure in the solution chamber filled with the saturated saline reaches-0.1 MPa, and continuing vacuumizing for 3 hours and then stopping; vacuumizing the rock sample chamber filled with the rock sample, and continuously vacuumizing for 2-4 h when the pressure in the rock sample chamber is about-0.1 MPa;
(1-2) opening a valve between the solution chamber and the rock sample chamber to enable saturated brine to enter the rock sample chamber, continuously vacuumizing, and stopping vacuumizing the rock sample chamber for 1h after the brine submerges the rock sample in the rock sample chamber;
step 2), measuring the resistivity of the rock core of the rock sample by a self-absorption saturation method;
(2-1) placing the vacuum saturated rock sample into a holder at normal temperature and normal pressure, and measuring the resistance of the vacuum saturated rock sampleRor；
(2-2) taking out a rock sample, weighing g by using an electronic balance, and weighing the initial saturation S of the saline water in the rock sampleWOThe calculation formula is as the formula (I):
SWO＝(m1-m)/pw/Vp(A)
In the formula:
Swois the initial water saturation of the rock sample, expressed in percent;
m1is the mass of a saturated brine rock sample in grams (g);
m is the mass of the dry rock sample in grams (g);
pwis the density of brine in grams per cubic centimeter (g/cm)3)；
VpIs the pore volume of the rock sample in cubic centimeters (cm)3)；
(2-3) continuously placing the tested rock sample into a vacuum saturation device, and repeating the steps 2-1) to 2-2 respectively after 3 days, 7 days and 15 days of self-absorption saturation to obtain the resistivity;
step 3), pressurizing a saturation method and measuring the resistivity of the rock core of the rock sample;
placing the rock sample measured in the step 2) into a solution chamber, connecting a pressure pump, increasing the pressure by 7MPa, and measuring the resistance r under the pressure conditionp1Reaching the limit saturation state; record volume V of increasing brinepAnd a resistance Rp1Water saturation degree Swp1And calculating by using the formula (two):
Swp1＝Swo+Vp1/Vp(II)
In the formula:
Swp1is the water saturation of the rock sample, expressed in percent;
Swois the initial water saturation of the rock sample, expressed in percent;
Vpis the pore volume of the rock sample in cubic centimeters (cm)3)；
Vp1Volume in milliliters (mL) of saline aspirated;
and recording the resistivity of each rock sample under the saturation condition, and calculating a resistivity parameter.
The invention has the beneficial effects that: compared with the traditional mode, the laboratory measurement method for the electrical properties of the shale in the Longmaxi group in the flat bridge area measures the resistance of the rock under each saturation condition in the saturation rising process on the basis of not damaging the rock core of the shale until the rock sample reaches the limit saturation state. And recording the volume and the resistance of the imbibed solution, and finally obtaining the rock resistivity parameters, namely a formation factor a, a pore cementation index m and a saturation index n, so as to effectively obtain the shale resistivity parameters.
Detailed Description
A laboratory measurement method for electrical properties of shale in Longmaxi groups in flat bridge areas comprises the following steps:
step 1), vacuumizing a solution chamber and a core chamber;
firstly, vacuumizing a solution chamber filled with saturated saline water until the pressure in the solution chamber filled with the saturated saline water is reduced to-0.1 MPa, and continuing vacuumizing for 3 hours and then stopping; vacuumizing the rock sample chamber filled with the rock sample, and continuously vacuumizing for 2-4 h when the pressure in the rock sample chamber is about-0.1 MPa;
then opening a valve between the solution chamber and the rock sample chamber, enabling saturated brine to enter the rock sample chamber, simultaneously continuing to vacuumize, and stopping after the brine submerges the rock sample in the rock sample chamber and continuing to vacuumize the rock sample chamber for 1 h;
step 2), measuring the resistivity of the rock core of the rock sample by a self-absorption saturation method;
firstly, putting a vacuum saturated rock sample into a normal-temperature normal-pressure clamp holder, and measuring the resistance R of the vacuum saturated rock sampleor；
Then taking out the rock sample, weighing g by using an electronic balance, and weighing the initial saturation S of the saline water in the rock sampleWOThe calculation formula is as the formula (I):
SWO＝(m1-m)/pw/Vp(A)
In the formula:
Swois the initial water saturation of the rock sample, expressed in percent;
m1is the mass of a saturated brine rock sample in grams (g);
m is the mass of the dry rock sample in grams (g);
pwis the density of brine in grams per cubic centimeter (g/cm)3)；
VpIs the pore volume of the rock sample in cubic centimeters (cm)3)；
(2-3) continuously placing the tested rock sample into a vacuum saturation device, and repeating the steps 2-1) to 2-2 respectively after 3 days, 7 days and 15 days of self-absorption saturation to obtain the resistivity;
step 3), pressurizing a saturation method and measuring the resistivity of the rock core of the rock sample;
placing the rock sample measured in the step 2) into a solution chamber, connecting a pressure pump, increasing the pressure by 7MPa, and measuring the resistance R under the pressure conditionp1Reaching the limit saturation state; record volume V of increasing brinepAnd a resistance Rp1Water saturation degree Swp1And calculating by using the formula (two):
Swp1＝Swo+Vp1/Vp(II)
In the formula:
Swp1is the water saturation of the rock sample, expressed in percent;
Swois the initial water saturation of the rock sample, expressed in percent;
Vpis the pore volume of the rock sample in cubic centimeters (cm)3)；
Vp1Volume in milliliters (mL) of saline aspirated;
and recording the resistivity of each rock sample under the saturation condition, and calculating a resistivity parameter.

Claims (1)

1. A laboratory measurement method for electrical properties of shale in Longmaxi groups in flat bridge areas is characterized by comprising the following steps:
step 1), vacuumizing a solution chamber and a core chamber;
(1-1) vacuumizing the solution chamber filled with the saturated saline until the pressure in the solution chamber filled with the saturated saline reaches-0.1 MPa, and continuing vacuumizing for 3 hours and then stopping; vacuumizing the rock sample chamber filled with the rock sample, and continuously vacuumizing for 2-4 h when the pressure in the rock sample chamber is about-0.1 MPa;
(1-2) opening a valve between the solution chamber and the rock sample chamber to enable saturated brine to enter the rock sample chamber, continuously vacuumizing, and stopping vacuumizing the rock sample chamber for 1h after the brine submerges the rock sample in the rock sample chamber;
step 2), measuring the resistivity of the rock core of the rock sample by a self-absorption saturation method;
(2-1) placing the vacuum saturated rock sample into a holder at normal temperature and normal pressure, and measuring the resistance R of the vacuum saturated rock sampleor；
(2-2) taking out a rock sample, weighing g by using an electronic balance, and weighing the initial saturation S of the saline water in the rock sampleWOThe calculation formula is as the formula (I):
SWO＝(m1-m)/pw/Vp(A)
In the formula:
Swois the initial water saturation of the rock sample, expressed in percent;
m1is the mass of a saturated brine rock sample in grams (g);
m is the mass of the dry rock sample in grams (g);
pwis the density of brine in grams per cubic centimeter (g/cm)3)；
VpIs the pore volume of the rock sample in cubic centimeters (cm)3)；
(2-3) continuously placing the tested rock sample into a vacuum saturation device, and repeating the steps 2-1) to 2-2 respectively after 3 days, 7 days and 15 days of self-absorption saturation to obtain the resistivity;
step 3), pressurizing a saturation method and measuring the resistivity of the rock core of the rock sample;
placing the rock sample measured in the step 2) into a solution chamber, connecting a pressure pump, increasing the pressure by 7MPa, and measuring the resistance R under the pressure conditionp1Reaching the limit saturation state; record volume V of increasing brinepAnd a resistance Rp1Water saturation degree Swp1And calculating by using the formula (two):
Swp1＝Swo+Vp1/Vp(II)
In the formula:
Swp1is the water saturation of the rock sample, expressed in percent;
Swois the initial water saturation of the rock sample, expressed in percent;
Vpis the pore volume of the rock sample in cubic centimeters (cm)3)。
Vp1Volume in milliliters (mL) of saline aspirated;
and recording the resistivity of each rock sample under the saturation condition, and calculating a resistivity parameter.
CN202110439897.8A 2021-04-23 2021-04-23 Laboratory measurement method for electrical properties of shale in Longmaxi group in flat bridge area Pending CN113219007A (en)

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* Cited by examiner, † Cited by third party
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CN114000865A (en) * 2021-09-14 2022-02-01 中海油能源发展股份有限公司 Full-automatic vacuumizing saturation system for dense rock and using method thereof

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Publication number Priority date Publication date Assignee Title
CN114000865A (en) * 2021-09-14 2022-02-01 中海油能源发展股份有限公司 Full-automatic vacuumizing saturation system for dense rock and using method thereof
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Application publication date: 20210806