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 PDFInfo
- 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
- Authority
- CN
- China
- Prior art keywords
- rock sample
- saturation
- rock
- resistivity
- chamber
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
Landscapes
- 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)
- Immunology (AREA)
- 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
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.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202110439897.8A CN113219007A (en) | 2021-04-23 | 2021-04-23 | Laboratory measurement method for electrical properties of shale in Longmaxi group in flat bridge area |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202110439897.8A CN113219007A (en) | 2021-04-23 | 2021-04-23 | Laboratory measurement method for electrical properties of shale in Longmaxi group in flat bridge area |
Publications (1)
Publication Number | Publication Date |
---|---|
CN113219007A true CN113219007A (en) | 2021-08-06 |
Family
ID=77088813
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN202110439897.8A Pending CN113219007A (en) | 2021-04-23 | 2021-04-23 | Laboratory measurement method for electrical properties of shale in Longmaxi group in flat bridge area |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN113219007A (en) |
Cited By (1)
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 |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4752882A (en) * | 1986-05-05 | 1988-06-21 | Mobil Oil Corporation | Method for determining the effective water saturation in a low-resistivity hydrocarbon-bearing rock formation based upon rock matrix conductance |
US20120143508A1 (en) * | 2010-12-01 | 2012-06-07 | Conocophillips Company | Automatic estimation of source rock petrophysical properties |
CN203101314U (en) * | 2012-11-12 | 2013-07-31 | 中国石油集团西部钻探工程有限公司 | Saturation-method core electrical property measuring device |
CN103698216A (en) * | 2014-01-02 | 2014-04-02 | 西南石油大学 | Capillary pressure stress sensitivity test device and capillary pressure stress sensitivity test method |
CN105606509A (en) * | 2015-12-22 | 2016-05-25 | 中国石油大学(华东) | Measuring method of high-temperature oil-water relative permeability of heavy oil reservoir |
CN106442269A (en) * | 2016-10-28 | 2017-02-22 | 西南石油大学 | Method for filtrating invariable cores used for laboratory physical simulation experiment |
CN110618170A (en) * | 2019-09-26 | 2019-12-27 | 中国石油天然气股份有限公司 | Method and device for determining saturation index of rock and soil |
CN111751180A (en) * | 2020-06-24 | 2020-10-09 | 中国石油天然气股份有限公司 | Ultra-low permeability rock core vacuumizing and pressurizing saturation device |
CN112051197A (en) * | 2019-06-05 | 2020-12-08 | 中国石油天然气股份有限公司 | Simple testing device and method for porosity of fracture-cave type carbonate rock |
-
2021
- 2021-04-23 CN CN202110439897.8A patent/CN113219007A/en active Pending
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4752882A (en) * | 1986-05-05 | 1988-06-21 | Mobil Oil Corporation | Method for determining the effective water saturation in a low-resistivity hydrocarbon-bearing rock formation based upon rock matrix conductance |
US20120143508A1 (en) * | 2010-12-01 | 2012-06-07 | Conocophillips Company | Automatic estimation of source rock petrophysical properties |
CN203101314U (en) * | 2012-11-12 | 2013-07-31 | 中国石油集团西部钻探工程有限公司 | Saturation-method core electrical property measuring device |
CN103698216A (en) * | 2014-01-02 | 2014-04-02 | 西南石油大学 | Capillary pressure stress sensitivity test device and capillary pressure stress sensitivity test method |
CN105606509A (en) * | 2015-12-22 | 2016-05-25 | 中国石油大学(华东) | Measuring method of high-temperature oil-water relative permeability of heavy oil reservoir |
CN106442269A (en) * | 2016-10-28 | 2017-02-22 | 西南石油大学 | Method for filtrating invariable cores used for laboratory physical simulation experiment |
CN112051197A (en) * | 2019-06-05 | 2020-12-08 | 中国石油天然气股份有限公司 | Simple testing device and method for porosity of fracture-cave type carbonate rock |
CN110618170A (en) * | 2019-09-26 | 2019-12-27 | 中国石油天然气股份有限公司 | Method and device for determining saturation index of rock and soil |
CN111751180A (en) * | 2020-06-24 | 2020-10-09 | 中国石油天然气股份有限公司 | Ultra-low permeability rock core vacuumizing and pressurizing saturation device |
Non-Patent Citations (3)
Title |
---|
方朝合 等: "页岩气藏超低含水饱和度形成模拟及其意义_", 《地球化学》 * |
林怡菲 等: "川东龙马溪组含水页岩吸附特征", 《西安石油大学学报(自然科学版)》 * |
王建波 等: "页岩气储层含水饱和度影响因素及计算方法—— 以焦石坝区块五峰组 — 龙马溪组为例", 《天然气技术与经济》 * |
Cited By (2)
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 |
CN114000865B (en) * | 2021-09-14 | 2023-09-01 | 中海油能源发展股份有限公司 | Full-automatic vacuum-pumping saturation system for tight rock and application method of full-automatic vacuum-pumping saturation system |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN103233725B (en) | Device and method for determining high temperature and high pressure full diameter core mud pollution evaluation | |
CN109374495B (en) | Experimental test device and method for forced permeability of shale | |
CN102608011B (en) | Method for determining and building bound water for crack-pore (hole) type reservoir core | |
CN106596371A (en) | Retrograde condensation damage experimental evaluation method for depletion type development near-wellbore zone of saturated condensate gas reservoir | |
CN106153662A (en) | The measuring method of rock core stress sensitivity | |
CN107402286B (en) | Delay swollen performance test experimental method in a kind of polymer microballoon rock core | |
US20240027379A1 (en) | Method for quantitative evaluation on sensitivity of shale oil and gas reservoir to injected fluids | |
CN110595953B (en) | Experimental test device and method for shale mixing wettability | |
CN107421872B (en) | Device for evaluating influence of different factors on water permeability of asphalt pavement | |
CN113514382B (en) | Method for evaluating water film thickness after water phase imbibition flowback of gas reservoir rock containing swelling clay | |
CN108240951A (en) | Sensitivity evaluation test method for tight sandstone gas reservoir | |
CN210834567U (en) | Shale mixes wettability experiment testing arrangement | |
CN108507919B (en) | Shale full-diameter core starting pressure test method under radial flow flowing mode | |
CN106198346B (en) | A kind of core holding unit and measurement method that can measure mechanics parameter and permeability | |
CN106777515B (en) | Method for analyzing production energy of tight gas well based on rock core experiment data | |
CN113484216B (en) | Method for evaluating water phase flowback rate and reasonable flowback pressure difference of tight sandstone gas reservoir | |
CN115078355B (en) | Visualization device and method for simulating gas phase characteristics of crude oil injection in porous medium | |
CN113219007A (en) | Laboratory measurement method for electrical properties of shale in Longmaxi group in flat bridge area | |
CN209821099U (en) | Multifunctional compact gas reservoir dynamic parameter joint measurement device based on nuclear magnetic resonance | |
CN115046897A (en) | Method and device for determining unsteady mass transfer efficiency and shape factor between matrix and crack | |
CN113075102A (en) | Method for establishing mathematical model of relation between spontaneous imbibition amount of porous medium and time | |
CN113092337B (en) | Method for establishing initial water saturation of compact rock core under in-situ condition | |
CN113777002A (en) | Shale oil seepage characteristic evaluation device and method | |
CN106526079B (en) | A method of research tight sand pore throat character dynamic change | |
CN111879678A (en) | Self-priming method-based experimental method for gas-water relative permeability of tight sandstone |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PB01 | Publication | ||
PB01 | Publication | ||
SE01 | Entry into force of request for substantive examination | ||
SE01 | Entry into force of request for substantive examination | ||
RJ01 | Rejection of invention patent application after publication | ||
RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210806 |