CN112983405A - Natural gamma logging method for rock debris - Google Patents
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- CN112983405A CN112983405A CN201911293625.0A CN201911293625A CN112983405A CN 112983405 A CN112983405 A CN 112983405A CN 201911293625 A CN201911293625 A CN 201911293625A CN 112983405 A CN112983405 A CN 112983405A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
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Abstract
The invention provides a natural gamma ray logging method for rock debris, which comprises the following steps: s1) respectively detecting natural gamma data of a quartz sandstone standard substance, a shale standard substance, a argillaceous limestone standard substance, a dolomite standard substance, a mixed sample of any two substances, a mixed sample of any three substances, a mixed sample of any four substances, a mixed sample of any five substances and a mixed sample of six substances, and establishing a natural gamma-lithology mathematical model; s2) detecting the natural gamma data of the rock debris sample drilled with the stratum, and obtaining the lithology of the rock debris sample drilled with the stratum according to the natural gamma-lithology mathematical model. Compared with the prior art, the method and the device have the advantages that the natural gamma information of the rock debris sample drilled in the stratum is detected according to the regular relationship between the natural gamma intensity information and the lithology of the rock debris, the lithology of the stratum drilled in the meeting is intelligently identified, the geological section coincidence rate is improved, and the oil and gas resources can be rapidly and accurately found.
Description
Technical Field
The invention belongs to the technical field of petroleum and natural gas exploration and development, and particularly relates to a natural gamma logging method for rock debris.
Background
In the process of petroleum and natural gas exploration and development, rock debris logging is an important technical means for discovering petroleum and natural gas resources, natural gamma information of a rock debris sample is detected by using a natural gamma logging instrument, the lithology of the sample is accurately identified, the geological profile coincidence rate can be improved, the oil and gas resources can be rapidly and accurately discovered, the target layer can be accurately clamped, and drilling safety accidents are avoided.
The natural gamma radioactive intensity has a close relationship with the lithology of the stratum, is mainly determined by the physical and chemical properties of the rock, is relatively less influenced by external factors, and is widely applied in the petroleum exploration process.
During the drilling process, the stratum to be drilled is broken by the drill bit to form rock debris, the rock debris reaches the ground through the circulation effect of the drilling fluid, the physical and chemical properties of the rock debris are not changed although the rock debris is broken, the measurement of the natural gamma radioactive intensity information of the rock debris by using a certain method can be considered for judging the lithology of the stratum, and the interference of the development of a new drilling technology to the geological logging work is eliminated.
The rock debris natural gamma intelligent logging method can intelligently identify the lithology of the stratum encountered by drilling, not only can solve the difficult problem of geological logging work, but also is beneficial to further promoting the improvement of drilling time effectiveness, and has important practical significance and application value.
The Chinese patent with publication number CN106555586A discloses a continuous natural gamma logging while drilling instrument and a logging method thereof, wherein the continuous natural gamma logging while drilling instrument mainly comprises a rock debris collector, a natural gamma sensor, an access comprehensive logging instrument and natural gamma signal acquisition software, and the rock debris collector is designed according to the field well logging condition and project design requirements to realize the functions of quantitative continuous collection and automatic updating of rock debris so as to achieve the purpose that the natural gamma sensor continuously measures underground rock debris. The natural gamma sensor is used for real-time detection, detection signals are input into the comprehensive logging instrument, correction of late arrival depth and data acquisition processing are carried out, real-time curves and real-time data can be output, reference basis is provided for lithology recognition, stratum comparison and position acquisition work of geological technicians, and exploration timeliness is improved. The invention relies on the comprehensive logging instrument in the aspect of natural gamma information homing drilling the depth of the stratum to be met, and the instrument can not independently realize the natural gamma logging of rock debris.
The Chinese patent with publication number CN103628869A discloses a lithology-oriented online natural gamma logging instrument for rock debris and a logging method thereof, wherein the instrument comprises a noise gamma detector, a sample gamma detector, a detection shielding body and other elements, the detection shielding body is positioned below the noise gamma detector and the sample gamma detector, a movable limiting slide rod is vertically fixed with the detection shielding body, a rock debris collector is positioned between a rock debris concentration spiral propeller and a mobile device bracket, a speed reducer is connected with an explosion-proof propulsion motor, the speed reducer is connected with the rock debris concentration spiral propeller through a coupler, an explosion-proof motor limiting chassis is positioned below the explosion-proof propulsion motor, a mobile control motor is connected with a mobile transmission belt, and a 3G wireless network transmitter and a serial wired communication port are connected with the noise gamma detector and the sample gamma detector. The invention realizes the on-line detection of the natural gamma information of the rock debris, but can not automatically identify the lithology of the stratum encountered by drilling.
The intelligent logging method for natural gamma rays of rock debris is required on a construction site by the development of the oil and gas exploration and development technology level.
Disclosure of Invention
In view of the above, the technical problem to be solved by the present invention is to provide a natural gamma logging method for rock debris, which can intelligently identify the lithology of the formation to be encountered.
The invention provides a natural gamma ray logging method for rock debris, which comprises the following steps:
s1) respectively detecting natural gamma data of a quartz sandstone standard substance, a shale standard substance, a argillaceous limestone standard substance, a dolomite standard substance, a mixed sample of any two substances, a mixed sample of any three substances, a mixed sample of any four substances, a mixed sample of any five substances and a mixed sample of six substances, and establishing a natural gamma-lithology mathematical model;
s2) detecting the natural gamma data of the rock debris sample drilled with the stratum, and obtaining the lithology of the rock debris sample drilled with the stratum according to the natural gamma-lithology mathematical model.
Preferably, the detecting of the natural gamma data in the steps S1) and S2) is performed by using a natural gamma logging device.
Preferably, the natural gamma logging apparatus comprises: the device comprises a sensor probe, a data processing control panel, a display panel, a data interface, a shielding tank and a power supply; the sensor probe is connected with the data processing control panel through a signal wire; the control panel, the display panel and the data interface are respectively connected with the database processing control panel through signal lines; the power supply is respectively connected with the sensor probe, the data processing control panel, the display panel and the data interface through power lines; the shielding tank is used for placing a sample to be detected; the sensor probe is located in the shielded tank.
Preferably, the volume of the quartz sandstone standard substance, the shale standard substance, the argillaceous limestone standard substance, the dolomite standard substance, the mixed sample of any two substances, the mixed sample of any three substances, the mixed sample of any four substances, the mixed sample of any five substances, the mixed sample of six substances and the rock debris sample is 200-800 ml.
Preferably, in the step S1), the ratio of each substance in any two-substance mixed sample, any three-substance mixed sample, any four-substance mixed sample, any five-substance mixed sample, and six-substance mixed sample in the mixed sample varies according to an arithmetic sequence having a step value of 5 to 15.
The invention provides a natural gamma ray logging method for rock debris, which comprises the following steps: s1) respectively detecting natural gamma data of a quartz sandstone standard substance, a shale standard substance, a argillaceous limestone standard substance, a dolomite standard substance, a mixed sample of any two substances, a mixed sample of any three substances, a mixed sample of any four substances, a mixed sample of any five substances and a mixed sample of six substances, and establishing a natural gamma-lithology mathematical model; s2) detecting the natural gamma data of the rock debris sample drilled with the stratum, and obtaining the lithology of the rock debris sample drilled with the stratum according to the natural gamma-lithology mathematical model. Compared with the prior art, the method and the device have the advantages that the natural gamma information of the rock debris sample drilled in the stratum is detected according to the regular relationship between the natural gamma intensity information and the lithology of the rock debris, the lithology of the stratum drilled in the meeting is intelligently identified, the geological profile coincidence rate is improved, the oil and gas resources can be rapidly and accurately found, the target horizon can be accurately clamped, and drilling safety accidents are avoided.
Drawings
FIG. 1 is a schematic flow chart of a natural gamma ray logging method for rock debris provided by the present invention;
FIG. 2 is a graph showing the effect of the application of example 1 of the present invention in a section 940 m-945 m of a QX3 well.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a natural gamma ray logging method for rock debris, which comprises the following steps: s1) respectively detecting natural gamma data of a quartz sandstone standard substance, a shale standard substance, a argillaceous limestone standard substance, a dolomite standard substance, a mixed sample of any two substances, a mixed sample of any three substances, a mixed sample of any four substances, a mixed sample of any five substances and a mixed sample of six substances, and establishing a natural gamma-lithology mathematical model; s2) detecting the natural gamma data of the rock debris sample drilled with the stratum, and obtaining the lithology of the rock debris sample drilled with the stratum according to the natural gamma-lithology mathematical model.
Referring to fig. 1, fig. 1 is a schematic flow chart of a natural gamma ray logging method for rock debris provided by the present invention.
Respectively detecting natural gamma data of a quartz sandstone standard substance, a shale standard substance, a argillaceous limestone standard substance, a dolomite standard substance, a mixed sample of any two substances, a mixed sample of any three substances, a mixed sample of any four substances, a mixed sample of any five substances and a mixed sample of six substances, and recording the natural gamma data; wherein the quartz sandstone standard substance, the shale standard substance, the argillaceous limestone standard substance, the limestone standard substance and the dolomite standard substance are all national standard substance samples without special limitation; the proportion of each substance in any two-substance mixed sample, any three-substance mixed sample, any four-substance mixed sample, any five-substance mixed sample and six-substance mixed sample in the mixed sample is preferably changed according to an arithmetic sequence with a step value of 5-15, more preferably 8-12, and still more preferably 10; the volume of the quartz sandstone standard substance, the shale standard substance, the argillaceous limestone standard substance, the dolomite standard substance, the mixed sample of any two substances, the mixed sample of any three substances, the mixed sample of any four substances, the mixed sample of any five substances and the mixed sample of six substances is preferably 200-800 ml, more preferably 300-700 ml, still more preferably 400-600 ml, and most preferably 500 ml.
The gamma data detection is preferably carried out by adopting natural gamma logging equipment; the natural gamma logging device is a natural gamma logging device well known to those skilled in the art, and is not particularly limited, and preferably includes a sensor probe, a data processing control panel, a display panel, a data interface, a shielding tank and a power supply; the sensor probe is connected with the data processing control panel through a signal wire; the control panel, the display panel and the data interface are respectively connected with the database processing control panel through signal lines; the power supply is respectively connected with the sensor probe, the data processing control panel, the display panel and the data interface through power lines; the shielding tank is used for placing a sample to be detected; the sensor probe is located in the shielded tank. The sample to be measured is placed in the shielding tank, the sensing probe is placed on the upper portion of the sample in the shielding tank and contacts the sample, and the natural gamma radioactivity intensity information of the sample is converted into an electric signal through the sensing probe and is transmitted to the data processing control panel through the signal wire to be processed and analyzed.
And analyzing the regular relation between the content of the standard substance in each standard substance and the mixed sample and the natural gamma data of the sample, and establishing a natural gamma-lithology mathematical model.
Detecting natural gamma data of a rock fragment sample of the stratum to be encountered, and obtaining lithology of the rock fragment sample of the stratum to be encountered according to a natural gamma-lithology mathematical model, namely intelligently identifying sandstone, shale, mudstone, limestone, dolomite and transitional lithology in the rock fragment sample of the stratum to be encountered; detecting natural gamma data of the rock debris sample drilled in the stratum with the drilling fluid by adopting natural gamma logging equipment; the natural gamma logging equipment is the same as the natural gamma logging equipment, and is not described again; the volume of the rock debris sample of the stratum to be drilled is preferably 200-800 ml, more preferably 300-700 ml, still more preferably 400-600 ml, and most preferably 500 ml.
According to the method, the natural gamma information of the rock debris sample drilled in the stratum is detected according to the regular relationship between the natural gamma intensity information and the lithology of the rock debris, the lithology of the stratum drilled in the meeting is intelligently identified, the geological profile coincidence rate is high, the oil and gas resources can be rapidly and accurately found, the target horizon can be accurately clamped, and the drilling safety accident can be avoided.
In order to further illustrate the present invention, the following describes a method for natural gamma-ray logging of rock debris according to the present invention in detail with reference to the following examples.
The reagents used in the following examples are all commercially available.
Example 1
1. Calibration natural gamma logging equipment
Respectively selecting and numbering national standard substance samples numbered GBW07106 (quartz sandstone), GBW07107 (shale), GBW07108 (argillaceous limestone), GBW07120 (limestone), GBW07404 (limestone weathered soil) and GBW07217a (dolomite) 500ml respectively, and numbering according to the proportion of 100% quartz sandstone, 90% quartz sandstone + 10% shale, 80% quartz sandstone + 20% shale, 70% quartz sandstone + 30% shale, 60% quartz sandstone + 40% shale, 50% quartz sandstone + 50% shale, 40% quartz sandstone + 60% shale, 30% quartz sandstone + 70% shale, 20% quartz sandstone + 80% shale, 10% quartz sandstone + 90% shale, 100% shale, 90% quartz sandstone + 10% limestone, 80% quartz sandstone + 20% limestone, 70% quartz sandstone + 30% limestone, 60% quartz sandstone + 40% limestone, and the like, The method comprises the steps of preparing different lithological mixed samples in a crossed mode according to a certain proportion content relationship of 50% quartz sandstone + 50% limestone, 40% quartz sandstone + 60% limestone, 30% quartz sandstone + 70% limestone, 20% quartz sandstone + 80% limestone, 10% quartz sandstone + 90% limestone, 100% limestone, 80% quartz sandstone + 10% shale + 10% argillaceous ash, 70% quartz sandstone + 10% shale + 10% argillaceous ash + 10% limestone, 60% quartz sandstone + 10% shale + 10% argillaceous ash + 10% limestone, 50% quartz sandstone + 10% shale + 10% argillaceous ash + 10% limestone, detecting natural gamma data of each sample by using a natural gamma logging device, and recording corresponding natural gamma data.
The natural gamma logging equipment is a CNR-2 type rock debris natural gamma logging instrument developed by logging companies of central petrochemical and central petroleum engineering Limited. This CNR-2 type detritus nature gamma logging appearance includes the sensor probe, the data processing control panel, the display panel, data interface, modules such as shielded cell and power, the sensor probe passes through the signal line and is connected with the data processing control panel, the display panel, data interface passes through the signal line respectively and is connected with the data processing control panel, the power passes through the power cord respectively with the sensor probe, the data processing control panel, the display panel, data interface connection, the sample is placed in the shielded cell, the sensor probe is arranged in shielded cell interior sample upper portion, and contact sample, the nature gamma radioactivity intensity information of sample converts the signal of telecommunication into through the sensor probe, send the data processing control panel through the signal line and carry out the processing analysis.
2. Natural gamma-lithology mathematical model
And analyzing the regular relation between the standard substance content in each sample and the natural gamma data of the sample, establishing a natural gamma-lithology mathematical model, and storing the model in a computer.
3. Collecting rock debris samples from formations drilled
According to the well depth change condition of the stratum to be drilled, the measuring cup is used for sequentially collecting 500ml of rock debris samples corresponding to the well depth, and corresponding well depth data are stored.
4. Measuring natural gamma intensity information of a sample
And respectively detecting rock debris samples with different well depths by utilizing natural gamma logging equipment, and recording corresponding natural gamma data.
5. Intelligent recognition rock debris sample lithology
According to a natural gamma-lithology mathematical model, the intelligent recognition is carried out on sandstone, shale, mudstone, limestone, dolomite and transitional lithology of the rock debris samples.
The effect graph of the application in the 900 m-950 m well section of the QX3 well is shown in figure 2.
Claims (5)
1. A method of natural gamma ray logging of rock debris, comprising:
s1) respectively detecting natural gamma data of a quartz sandstone standard substance, a shale standard substance, a argillaceous limestone standard substance, a dolomite standard substance, a mixed sample of any two substances, a mixed sample of any three substances, a mixed sample of any four substances, a mixed sample of any five substances and a mixed sample of six substances, and establishing a natural gamma-lithology mathematical model;
s2) detecting the natural gamma data of the rock debris sample drilled with the stratum, and obtaining the lithology of the rock debris sample drilled with the stratum according to the natural gamma-lithology mathematical model.
2. The method as claimed in claim 1, wherein the detecting of the natural gamma data in the steps S1) and S2) is performed using a natural gamma logging device.
3. The method of claim 2, wherein the natural gamma logging device comprises: the device comprises a sensor probe, a data processing control panel, a display panel, a data interface, a shielding tank and a power supply; the sensor probe is connected with the data processing control panel through a signal wire; the control panel, the display panel and the data interface are respectively connected with the database processing control panel through signal lines; the power supply is respectively connected with the sensor probe, the data processing control panel, the display panel and the data interface through power lines; the shielding tank is used for placing a sample to be detected; the sensor probe is located in the shielded tank.
4. The method according to claim 1, wherein the volume of the quartz sandstone standard substance, the shale standard substance, the argillaceous limestone standard substance, the limestone-rock standard substance, the dolomite standard substance, the mixed sample of any two substances, the mixed sample of any three substances, the mixed sample of any four substances, the mixed sample of any five substances, the mixed sample of six substances and the rock debris sample is 200 to 800 ml.
5. The method according to claim 1, wherein the proportion of each of the two-substance mixed sample, the three-substance mixed sample, the four-substance mixed sample, the five-substance mixed sample, and the six-substance mixed sample in the step S1) varies according to an arithmetic sequence having a step value of 5 to 15.
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| CN114235871A (en) * | 2021-12-08 | 2022-03-25 | 核工业二三O研究所 | Comprehensive logging method for in-situ leaching sandstone type uranium ores |
| CN114280105A (en) * | 2021-12-02 | 2022-04-05 | 中煤科工集团西安研究院有限公司 | Coal rock rapid identification device and method based on drilling rock debris |
| CN116066065A (en) * | 2021-12-16 | 2023-05-05 | 中国石油天然气集团有限公司 | Drilling horizon identification method |
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Cited By (5)
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| CN114280105A (en) * | 2021-12-02 | 2022-04-05 | 中煤科工集团西安研究院有限公司 | Coal rock rapid identification device and method based on drilling rock debris |
| CN114280105B (en) * | 2021-12-02 | 2024-02-13 | 中煤科工集团西安研究院有限公司 | Quick coal and rock identification device and identification method based on drill cuttings |
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Effective date of registration: 20220127 Address after: 100028 Chaoyang District, Beijing Hui Xin Street 6, Twelfth level. Applicant after: SINOPEC OILFIELD SERVICE Corp. Applicant after: Sinopec Jingwei Co.,Ltd. Applicant after: SINOPEC ZHONGYUAN PETROLEUM ENGINEERING Co.,Ltd. Applicant after: Zhongyuan measurement and control company of Sinopec Jingwei Co.,Ltd. Address before: 100028 Chaoyang District, Beijing Hui Xin Street 6, Twelfth level. Applicant before: SINOPEC OILFIELD SERVICE Corp. Applicant before: SINOPEC ZHONGYUAN PETROLEUM ENGINEERING Co.,Ltd. Applicant before: WELL LOGGING COMPANY OF SINOPEC ZHONGYUAN PETROLEUM ENGINEERING Co.,Ltd. |