CN109344516B - Method and device for determining weathering potential energy index of rock while drilling in geological logging - Google Patents

Method and device for determining weathering potential energy index of rock while drilling in geological logging Download PDF

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CN109344516B
CN109344516B CN201811189321.5A CN201811189321A CN109344516B CN 109344516 B CN109344516 B CN 109344516B CN 201811189321 A CN201811189321 A CN 201811189321A CN 109344516 B CN109344516 B CN 109344516B
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weathering
potential energy
index
energy index
rock
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CN109344516A (en
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王飞龙
蒋新立
温伟
马辉
吴天乾
杨春文
刘剑波
贾光亮
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Sinopec Oilfield Service Corp
Sinopec North China Petroleum Engineering Corp
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Sinopec North China Petroleum Engineering Corp
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Abstract

The invention relates to a method and a device for determining rock weathering potential energy index while drilling in a geological logging, and belongs to the technical field of rock weathering discrimination. Firstly, measuring the contents of chemical elements in rock cores and rock fragments in different drilling depths on an oil drilling site in a research area to obtain the contents of the chemical elements in different depths; then the obtained chemical element contents with different depths are brought into an element weathering potential energy index calculation model to determine element weathering potential energy indexes with different depths, wherein the element weathering potential energy indexes comprise parker weathering potential energy index F WIP And/or granite weathering potential energy index F WIG . The element weathered potential energy index obtained by the method has high timeliness, can continuously change along with the well depth, has wider application, and overcomes the problems of low timeliness and discontinuity of the weathered potential energy index obtained by a laboratory.

Description

Method and device for determining weathering potential energy index of rock while drilling in geological logging
Technical Field
The invention relates to a method and a device for determining rock weathering potential energy index while drilling in a geological logging, and belongs to the technical field of rock weathering discrimination.
Background
Weathering refers to the process of breaking up and decomposing unstable minerals of rock under the physical, chemical and biological actions, and has important significance in petroleum geology research. In the weathering process, along with the decomposition of unstable minerals, rock elements continuously change, firstly active alkali metal elements (Na, K) and alkaline earth metal elements (Ca, mg) are dissolved and leached, then the minerals containing P, S, si elements are decomposed, and along with the weathering process, relatively stable elements Fe, al and Ti are enriched due to the relative loss of other components. Therefore, many scholars calculate an index for measuring the degree of weathering using the oxide content based on the loss and migration characteristics of the element.
Currently, the weathering index in petroleum drilling is mainly expressed according to the relative change relation of the mole number of oxides in rock minerals, such as the Wiegot residual product index V= (Al) 2 O 3 +K 2 O)/(MgO+CaO+Na 2 O). In order to further accurately describe the rock weathering degree, a sensitive mineral reflecting the weathering degree can be optimized according to the difference of the parent minerals, for example, the weathering index of the parent minerals mainly comprising silicate is park weathering index wip=100 (2na 2O/0.35+2k2o/0.25+mgo/0.9+cao x/0.7); the weathering index (Weathering Index of Granite) of the parent mineral with granite as the main component is wig=100 (na2o+k2o+cao-10/3×p2o5)/(al2o3+fe2o3+tio2).
For example, chinese patent application publication No. CN105717149a discloses a method for determining the degree of basalt weathering, which comprises collecting basalt samples, detecting the content of eight oxides in the basalt samples, and calculating the value of chemical index BWI of the basalt samples according to the content of each oxide, bwi= (Fe) 2 O 3 +Al 2 O 3 )/(SiO 2 +K 2 O+Na 2 And finally judging the weathering degree of the basalt stone according to the obtained chemical index.
All the methods calculate the weathering index by using the oxide content, and the rock sample is needed to be taken in the drilling core, and the oxide content is obtained by laboratory test analysis. Because the drilling coring well sections are few and discontinuous, the obtained weathering index lacks systematicness; and because of the long analysis period, the production needs are difficult to meet.
Disclosure of Invention
The invention aims to provide a determination method of rock weathering potential energy index while drilling in a geological logging, which aims to solve the problems that the obtained weathering potential energy index is not timely and discontinuous due to the fact that rock weathering potential energy index is represented by rock oxide content obtained in a laboratory at present; meanwhile, the invention also provides a device for determining the rock weathering potential energy index while drilling in the geological logging.
The invention provides a determination method of rock weathering potential energy index while drilling in a geological logging, which comprises the following steps of:
1) Measuring the contents of chemical elements in rock cores and rock scraps in different drilling depths in an oil drilling site in a research area to obtain the contents of the chemical elements in different depths;
2) Bringing the obtained chemical element contents with different depths into an element weathering potential energy index calculation model to determine element weathering potential energy indexes with different depths, wherein the element weathering potential energy indexes comprise parker weathering potential energy index F WIP And/or granite weathering potential energy index F WIG 。
According to the method, the element weathering potential energy index is calculated according to the rock element content obtained in real time on the petroleum drilling site, the obtained element weathering potential energy index is high in timeliness, the obtained element weathering potential energy index can continuously change along with the well depth, the application is wider, and the problems of low timeliness and discontinuity of the weathering potential energy index obtained in a laboratory are solved.
Further, the invention provides a calculation model of element weathering potential energy indexes, each element is added with a corresponding area constant, the calculated weathering potential energy indexes can more accurately reflect the actual weathering degree of the rocks in the research area, and the parent source minerals are Parker weathering potential energy indexes F mainly comprising silicate minerals WIP The calculation model is as follows:
F WIP ＝100·(0.1242c 1 ·Na+0.1026c 2 ·K+0.0463c 3 ·Mg+0.0357c 4 ·Ca-0.0768c 5 ·P)
granite weathering potential energy index F of parent mineral based on granite WIG The calculation model is：
F WIG ＝100·(0.0217d 1 ·Na+0.0128d 2 ·K+0.0250d 3 ·Ca-0.0538d 4 ·P)/(0.0185d 5 ·Al+0.0089d 6 ·Fe+0.0204d 6 Ti) wherein Al, K, mg, ca, na, P, fe and Ti are the mass percentages of the chemical elements aluminum, potassium, magnesium, calcium, sodium, phosphorus, iron and titanium, respectively, c 1 、c 2 、c 3 、c 4 、c 5 、d 1 、d 2 、d 3 、d 4 、d 5 And d 6 The area constants are all related to parent minerals, and are all 1 in an ideal model.
Furthermore, the invention also provides a determination process of the area constant in the calculation model, so that the calculation model can be closer to the actual, the accuracy of the element wind potential energy index is improved, and the determination process of the area constant is as follows:
A. screening rock cores with different levels of weathering as sampling objects in a research area, and obtaining the chemical element content and the oxidized mineral content of each sampling object;
B. determining an element weathering potential energy index under an ideal model according to the obtained chemical element content, wherein the element weathering potential energy index comprises a Parker weathering potential energy index F WIP And/or granite weathering potential energy index F WIG Determining an oxide weathering index based on the oxidized mineral content;
C. fitting the obtained oxide weathering index of each sampling object with the element weathering potential energy index of the corresponding sampling object, and adjusting the area constant in the ideal model to enable the two absolute correlation coefficients of the element weathering potential energy index and the oxide weathering index to be more than a set value.
Furthermore, the invention provides a specific measurement mode of the content of the chemical elements for measuring the content of the chemical elements of the rock, wherein the content of the chemical elements is measured by an X-ray element logging instrument.
Further, in order to determine the area constant in the element weathering potential energy index calculation model, the invention provides a fitting mode, wherein the oxide weathering index in the step B is obtained by samplingThe molar percentage content of the oxidized minerals of the core is calculated, the oxide weathering index comprises a parker weathering index WIP and/or a granite weathering index WIG, and the step C is to fit the parker weathering index WIP and the parker weathering potential index F WIP Fitting the granite weathering index WIG and the granite weathering potential energy index F WIG Fitting was performed.
Further, the set value in the step C is 0.9.
The invention also provides a determination device for the rock weathering potential energy index while drilling in the geological logging, which comprises a memory, a processor and a computer program stored on the memory and running on the processor, wherein the processor is coupled with the memory, and the following steps are realized when the processor executes the computer program:
1) Measuring the contents of chemical elements in rock cores and rock scraps in different drilling depths in an oil drilling site in a research area to obtain the contents of the chemical elements in different depths;
2) Bringing the obtained chemical element contents with different depths into an element weathering potential energy index calculation model to determine element weathering potential energy indexes with different depths, wherein the element weathering potential energy indexes comprise parker weathering potential energy index F WIP And/or granite weathering potential energy index F WIG 。
Further, the parent mineral is based on silicate mineral, parker weathering potential energy index F WIP The calculation model is as follows:
F WIP ＝100·(0.1242c 1 ·Na+0.1026c 2 ·K+0.0463c 3 ·Mg+0.0357c 4 ·Ca-0.0768c 5 ·P)
granite weathering potential energy index F of parent mineral based on granite WIG The calculation model is as follows:
F WIG ＝100·(0.0217d 1 ·Na+0.0128d 2 ·K+0.0250d 3 ·Ca-0.0538d 4 ·P)/(0.0185d 5 ·Al+0.0089d 6 ·Fe+0.0204d 6 ti) wherein Al, K, mg, ca, na, P, fe and Ti are respectively the chemical elements aluminum, potassium,C, mass percentage of magnesium, calcium, sodium, phosphorus, iron and titanium 1 、c 2 、c 3 、c 4 、c 5 、d 1 、d 2 、d 3 、d 4 、d 5 And d 6 The area constants are all related to parent minerals, and are all 1 in an ideal model.
Further, the determination process of the area constant is as follows:
A. screening rock cores with different levels of weathering as sampling objects in a research area, and obtaining the chemical element content and the oxidized mineral content of each sampling object;
B. determining an element weathering potential energy index under an ideal model according to the obtained chemical element content, wherein the element weathering potential energy index comprises a Parker weathering potential energy index F WIP And/or granite weathering potential energy index F WIG Determining an oxide weathering index based on the oxidized mineral content;
C. fitting the obtained oxide weathering index of each sampling object with the element weathering potential energy index of the corresponding sampling object, and adjusting the area constant in the ideal model to enable the two absolute correlation coefficients of the element weathering potential energy index and the oxide weathering index to be more than a set value.
Further, the chemical element content is measured by an X-ray element logging instrument.
Further, the oxide weathering index in the step B is calculated from the mole percentage content of the oxidized minerals of the sample core, the oxide weathering index comprises a Pake weathering index WIP and/or a granite weathering index WIG, and the step C is to fit the Pake weathering index WIP and the Pake weathering potential index F WIP Fitting the granite weathering index WIG and the granite weathering potential energy index F WIG Fitting was performed.
Further, the set value in the step C is 0.9.
Drawings
FIG. 1 is a chart of elemental weathered potential energy index F of a sample of layers of varying degrees of weathering in an oilfield in North China WIP Fitting a graph with the parker weathering index WIP;
FIG. 2 is a chart of elemental weathered potential energy index F of a sample of layers of varying degrees of weathering in an oilfield in North China WIG Fitting a map with a granite weathering index WIG;
FIG. 3 is a graph showing the comprehensive analysis of X-ray element logging wind potential energy index of a well in an oilfield in North China.
Detailed Description
The following describes specific embodiments of the present invention in detail with reference to the drawings.
Embodiments of the method for determining the weathering potential energy index of rock while drilling in geological logging
Firstly, measuring the contents of chemical elements in rock cores and rock fragments in different drilling depths on an oil drilling site in a research area to obtain the contents of the chemical elements in different depths; then the obtained chemical element contents with different depths are brought into an element weathering potential energy index calculation model to determine element weathering potential energy indexes with different depths, wherein the element weathering potential energy indexes comprise parker weathering potential energy index F WIP And granite weathering potential energy index F WIG . The specific implementation manner of each step is described in detail below.
1. And screening the rock cores with different levels of weathering degrees in a research area to obtain the chemical element content and the oxidized mineral content of each sampling object.
On the basis of regional geological research, a core with different levels of weathering degree and representativeness is screened as a sampling object. The chemical elements of the sampling object are analyzed by an X-ray element logging instrument (or an X-ray fluorescence analyzer with the same function) to obtain the content of each chemical element, wherein the measured chemical elements comprise, but are not limited to, the following elements: silicon, aluminum, iron, titanium, sodium, potassium, calcium, magnesium, phosphorus; the molar fraction of oxidized minerals was analyzed for each sample using a laboratory.
2. And determining the oxide weathering index of the sampling object and the element weathering potential energy index under the ideal model.
The elemental weathering potential energy index of the present invention includes the Parker weathering potential energy index F WIP And granite weathering potential energy index F WIG . This practice isExample choices include Parker Weathering potential energy index F WIP And granite weathering potential energy index F WIG And (5) performing weathering potential energy index calculation.
According to the research area parent source type, optimizing the sensitive element type reflecting the weathering degree, optimizing a calculation model of the weathering potential energy index by using the sensitive element combination, wherein the parent source mineral is based on the Pake weathering potential energy index F of silicate minerals WIP The calculation model is as follows:
F WIP ＝100·(0.1242c 1 ·Na+0.1026c 2 ·K+0.0463c 3 ·Mg+0.0357c 4 ·Ca-0.0768c 5 ·P)
wherein K, mg, ca, na, P is the mass percentage of chemical elements of potassium, magnesium, calcium, sodium and phosphorus, c 1 、c 2 、c 3 、c 4 、c 5 The area constants are all related to parent minerals, and are all 1 in an ideal model. F (F) WIP The larger the number, the more easily weathered, i.e., the lower the degree of rock weathering, and 0 represents complete rock weathering.
According to the research area mother source type, optimizing the sensitive element type reflecting the weathering degree, optimizing the weathering index calculation model by using the sensitive element combination, and the granite weathering potential energy index F of the mother source mineral with granite as the main material WIG The calculation model is as follows:
F WIG ＝100·(0.0217d 1 ·Na+0.0128d 2 ·K+0.0250d 3 ·Ca-0.0538d 4 ·P)/(0.0185d 5 ·Al+0.0089d 6 ·Fe+0.0204d 6 ·Ti)
wherein Al, K, ca, na, P, fe and Ti are respectively the mass percentages of chemical elements of aluminum, potassium, calcium, sodium, phosphorus, iron and titanium; d, d 1 、d 2 、d 3 、d 4 、d 5 And d 6 The area constants are all related to parent minerals, and are all 1 in an ideal model. F (F) WIG The larger the number, the more easily weathered, i.e., the lower the degree of rock weathering, and 0 represents complete rock weathering.
The weathering potential energy index of each sampling object under the ideal model can be calculated through the formula.
The corresponding oxide weathering index is obtained by using the molar percentage content of the oxidized minerals analyzed in the laboratory according to the parker weathering index WIP and granite weathering index WIG formulas, the specific calculation formulas being described in the background art and not described in detail here.
3. And (5) performing data fitting, and adjusting the area constant in the element weathering potential energy index.
The parker weathering index WIP and the parker weathering potential index F of each sampling object obtained by a laboratory are calculated WIP Fitting, namely fine tuning the regional constant in the Peak weathering potential energy index calculation model according to a statistical analysis rule to enable the two absolute correlation coefficients of the Peak weathering potential energy index and the Peak weathering index WIP calculated by laboratory oxidized minerals to reach more than a set value (0.9 in the embodiment), wherein the Peak weathering potential energy index F WIP Calculating the area constant in the model, namely the area constant aiming at the research area, and bringing the obtained area constant into the Parker weathering potential energy index F WIP Calculating the model to obtain the optimized Parker weathering potential energy index F WIP And calculating a model.
Similarly, the granite weathering index WIG and the granite weathering potential energy index F of each sampling object obtained in a laboratory are used for WIG Fitting, namely fine-tuning the regional constant in the weathered potential energy index calculation model according to the statistical analysis rule to enable the granite weathered potential energy index F WIG The two absolute correlation coefficients of the granite weathering index WIG calculated with the laboratory oxidized minerals reach more than the set value (0.9 in this example), at this time, the granite weathering potential energy index F WIG Calculating the area constant in the model to obtain the area constant for the research area, and bringing the obtained area constant into the granite weathering potential energy index F WIG Calculating the model to obtain the optimized granite weathering potential energy index F WIG And calculating a model.
4. And calculating the on-site element weathering index according to the optimized calculation model.
Adopting an X-ray element logging instrument (or an X-ray fluorescence analyzer with the same function) to continuously analyze chemical elements in a rock core and rock debris along with the drilling depth on a petroleum drilling site so as to obtain the along-depthElement content data for degree variation, wherein chemical elements include, but are not limited to, the following: silicon, aluminum, iron, titanium, sodium, potassium, calcium, magnesium, phosphorus. Bringing the rock element content obtained in situ into an optimized Parker weathering potential energy index F WIP Calculation model and granite weathering potential energy index F WIG Calculating a corresponding element weathered potential energy index by a calculation model, drawing a weathered potential energy index curve, quantitatively evaluating the rock weathered degree by using the obtained weathered potential energy index value, dividing and comparing the stratum according to the weathered potential energy index value and curve change, and determining the study of the weathered crust weathered degree on the physical property and oil gas enrichment rule of the reservoir.
The effect of the present invention will be verified by taking an oilfield in North China as an example.
1. Firstly, screening out representative rock cores with different levels of weathering as sampling objects on the basis of geological research of the area, taking 1 inch small rock core columns to be equally divided from the middle, writing the same numbers, and performing X-ray elemental analysis on half samples to obtain rock element mass percent data, wherein the mass percent data are shown in table 1; the other half was sent to a laboratory for oxide mineral content analysis to obtain rock oxide mineral mole fraction content data as shown in table 2.
2. Analyzing the element mass percentage content of each sampling object by using an X-ray element logging instrument, and obtaining the Parker weathering potential energy index F according to an ideal model WIP And granite weathering potential energy index F WIG Calculating a model (namely, calculating a regional constant in the model to be 1), and primarily calculating a rock weathering index; and calculating the rock weathering degree according to the parker weathering index WIP and the granite weathering index WIG formula by using the molar percentage content of the oxidized minerals analyzed in the laboratory.
3. The parker weathering index WIP and the parker weathering potential index F of each sampling object obtained by a laboratory are calculated WIP Fitting, namely obtaining the weathering index WIG of each sampling object obtained in a laboratory and the granite weathering potential energy index F WIG Fitting, namely fine tuning the regional constant in the weathering potential energy index calculation model according to the statistical analysis rule to enable the two absolute phase relations of the element weathering potential energy index and the weathering index calculated by the laboratory oxidized minerals to be achievedAnd at the moment, the area constant in the element weathering potential energy index computing model is the area constant aiming at the research area, and the optimized element weathering potential energy index computing model is determined according to the obtained area constant.
4. Continuously analyzing the content of chemical elements in the rock core and the rock scraps with the drilling depth on the petroleum drilling site by adopting an X-ray elemental analyzer to obtain the content of X-ray elements which change with the depth; calculating the rock Parker weathering potential energy index F according to the optimized element weathering index calculation model by utilizing the X-ray element content data WIP And granite weathering potential energy index F WIG The calculation results are shown in Table 3.
5. According to the rock Parker weathering potential energy index F WIP And granite weathering potential energy index F WIG And drawing a comprehensive graph of the weathering index by using the data, the core segment laboratory weathering index data and the conventional geological logging data.
FIG. 3 is a Parker's weathering potential energy index F calculated from the elemental content of an X-ray elemental log analysis of a well in an oilfield in North China WIP And granite weathering potential energy index F WIG And comparing and analyzing the comprehensive graph with the parker weathering index WIP and the granite weathering index WIG which are analyzed and calculated by the core segment laboratory.
As can be seen from fig. 3, the weathering index calculated from the laboratory analysis data is compatible with the weathering index calculated from the X-ray elemental analysis data of the petroleum drilling site. The rock weathering levels (parker weathering index WIP and granite weathering index WIG) calculated in the laboratory for the four coring sections (50205028 m,5080-5084, 5115-5124m,5180-5184 m) are distributed over the elemental weathering potential energy index curve (elemental weathering potential energy index F) WIP And element wind potential energy index F WIG ) On both sides, the rock weathering index obtained by the rock weathering potential energy index calculation method while drilling in the geological logging is proved to be accurate and reliable.
Meanwhile, as can be seen from FIG. 3, the weathered crust overburden Xu Zhuangzu is a strong weathered formation, elemental weathered potential energy index F WIP And element wind potential energy index F WIG The negative anomaly is great, which indicates that the weathering degree is high; the underlying sea stratum Mao Zhuangzu is deposited in a reducing environmentElement wind potential energy index F WIP And element wind potential energy index F WIG The abnormal positive state is greatly abnormal, which indicates that the weathering degree is low; element weathered potential energy index F of upper land stratum sand river street group WIP And element wind potential energy index F WIG Centering, explaining the element weathering potential energy index F WIP And element wind potential energy index F WIG Truly reflects the weathering degree of stratum rock.
Therefore, the method can calculate the weathering index in real time on the petroleum drilling site, has high timeliness, can obtain the weathering index with continuous depth of field, has wider application, and overcomes the problem of discontinuous weathering index obtained in a laboratory; in addition, each element is added with a corresponding area constant, and the calculated weathering index can more accurately reflect the actual weathering degree of the rock in the research area.
Embodiments of a device for determining a rock weathering potential energy index while drilling in a geological logging
The method may be stored as a computer program in a memory in a rock while drilling weathering potential energy index determination apparatus in a geological logging and may be run on a processor in the rock while drilling weathering potential energy index determination apparatus in a ground logging. A processor in the apparatus may be implemented as a single-chip microcomputer, DSP, PLC, or MCU, etc., a memory may be implemented as RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art, which may be coupled to the processor, enabling the processor to read information from the storage medium, or which may be an integral part of the processor. The method of steps performed in the apparatus is described in detail in the embodiments of the method, and will not be described herein.
The foregoing embodiments are only illustrative of the present invention, and the steps of the method may be changed, and all equivalent changes and modifications performed on the basis of the technical solutions of the present invention should not be excluded from the protection scope of the present invention.
Table 1: well logging analysis and weathering potential energy calculation statistics table for X-ray element of certain oil field in North China
Continuing with table 1: statistical table for X-ray element logging analysis and weathering index calculation of certain oil field in North China
Continuing with table 1: statistical table for X-ray element logging analysis and weathering index calculation of certain oil field in North China
Table 2: analysis and weathering index calculation statistical table for core oxide minerals of certain oil field in North China
Continuing with table 2: analysis and weathering index calculation statistical table for core oxide minerals of certain oil field in North China
Continuing with table 2: analysis and weathering index calculation statistical table for core oxide minerals of certain oil field in North China
Table 3: x-ray element logging analysis and weathering potential energy calculation table for certain well of certain oil field in North China
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Continuing with table 3: x-ray element logging analysis and weathering potential energy calculation table for certain well of certain oil field in North China
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Continuing with table 3: x-ray element logging analysis and weathering potential energy calculation table for certain well of certain oil field in North China
Continuing with table 3: x-ray element logging analysis and weathering potential energy calculation table for certain well of certain oil field in North China
Continuing with table 3: x-ray element logging analysis and weathering potential energy calculation table for certain well of certain oil field in North China
Continuing with table 3: x-ray element logging analysis and weathering potential energy calculation table for certain well of certain oil field in North China
Continuing with table 3: x-ray element logging analysis and weathering potential energy calculation table for certain well of certain oil field in North China
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Claims (8)

1. A method for determining a rock weathering potential energy index while drilling in a geological logging is characterized by comprising the following steps:
1) Measuring the contents of chemical elements in rock cores and rock scraps in different drilling depths in an oil drilling site in a research area to obtain the contents of the chemical elements in different depths;
2) Bringing the obtained chemical element contents with different depths into an element weathering potential energy index calculation model to determine element weathering potential energy indexes with different depths, wherein the element weathering potential energy indexes comprise parker weathering potential energy index F WIP And/or granite weathering potential energy index F WIG The method comprises the steps of carrying out a first treatment on the surface of the Parker weathering potential energy index F of parent mineral based on silicate mineral WIP The calculation model is as follows:
F WIP ＝100·(0.1242c 1 ·Na+0.1026c 2 ·K+0.0463c 3 ·Mg+0.0357c 4 ·Ca-0.0768c 5 ·P)
granite weathering potential energy index F of parent mineral based on granite WIG The calculation model is as follows:
F WIG ＝100·(0.0217d 1 ·Na+0.0128d 2 ·K+0.0250d 3 ·Ca-0.0538d 4 ·P)/(0.0185d 5 ·Al+0.0089d 6 ·Fe+0.0204d 6 ·Ti)
wherein Al, K, mg, ca, na, P, fe and Ti are respectively the mass percentages of chemical elements of aluminum, potassium, magnesium, calcium, sodium, phosphorus, iron and titanium, c 1 、c 2 、c 3 、c 4 、c 5 、d 1 、d 2 、d 3 、d 4 、d 5 And d 6 The area constants are all area constants related to parent minerals, and are all 1 under an ideal model;
the determination process of the area constant is as follows:
A. screening rock cores with different levels of weathering as sampling objects in a research area, and obtaining the chemical element content and the oxidized mineral content of each sampling object;
B. determining an element weathering potential energy index under an ideal model according to the obtained chemical element content, wherein the element weathering potential energy index comprises a Parker weathering potential energy index F WIP And/or granite weathering potential energy index F WIG Determining an oxide weathering index based on the oxidized mineral content;
C. fitting the obtained oxide weathering index of each sampling object with the element weathering potential energy index of the corresponding sampling object, and adjusting the area constant in the ideal model to enable the two absolute correlation coefficients of the element weathering potential energy index and the oxide weathering index to be more than a set value.
2. The method for determining the weathering potential energy index of rock while drilling in geological logging according to claim 1, wherein the chemical element content is measured by an X-ray element logging instrument.
3. The method of determining the potential energy index of rock while drilling in a geological logging according to claim 1, wherein the oxide weathering index in step B is calculated from the mole percentage of oxidized minerals in the sample core, the oxide weathering index comprises the park weathering index WIP and/or the granite weathering index WIG, and the step C is to fit the park weathering index WIP to the park weathering potential energy index F WIP Fitting the granite weathering index WIG and the granite weathering potential energy index F WIG Fitting was performed.
4. The method for determining the weathering potential energy index of rock while drilling in a geological logging according to claim 3, wherein the set value in the step C is 0.9.
5. A device for determining a potential energy index of rock weathering while drilling in a geological logging, the device comprising a memory and a processor, and a computer program stored on the memory and running on the processor, the processor being coupled to the memory, the processor implementing the following steps when executing the computer program:
1) Measuring the contents of chemical elements in rock cores and rock scraps in different drilling depths in an oil drilling site in a research area to obtain the contents of the chemical elements in different depths;
2) Bringing the obtained chemical element contents with different depths into an element weathering potential energy index calculation model to determine element weathering potential energy indexes with different depths, wherein the element weathering potential energy indexes comprise parker weathering potential energy index F WIP And/or granite weathering potential energy index F WIG The method comprises the steps of carrying out a first treatment on the surface of the Parker weathering potential energy index F of parent mineral based on silicate mineral WIP The calculation model is as follows:
F WIP ＝100·(0.1242c 1 ·Na+0.1026c 2 ·K+0.0463c 3 ·Mg+0.0357c 4 ·Ca-0.0768c 5 ·P)
granite weathering potential energy index F of parent mineral based on granite WIG The calculation model is as follows:
F WIG ＝100·(0.0217d 1 ·Na+0.0128d 2 ·K+0.0250d 3 ·Ca-0.0538d 4 ·P)/(0.0185d 5 ·Al+0.0089d 6 ·Fe+0.0204d 6 ·Ti)
wherein Al, K, mg, ca, na, P, fe and Ti are respectively the mass percentages of chemical elements of aluminum, potassium, magnesium, calcium, sodium, phosphorus, iron and titanium, c 1 、c 2 、c 3 、c 4 、c 5 、d 1 、d 2 、d 3 、d 4 、d 5 And d 6 The area constants are all area constants related to parent minerals, and are all 1 under an ideal model;
the determination process of the area constant is as follows:
A. screening rock cores with different levels of weathering as sampling objects in a research area, and obtaining the chemical element content and the oxidized mineral content of each sampling object;
B. determining an element weathering potential energy index under an ideal model according to the obtained chemical element content, wherein the element weathering potential energy index comprises a Parker weathering potential energy index F WIP And/or granite weathering potential energy index F WIG Determining an oxide weathering index based on the oxidized mineral content;
C. fitting the obtained oxide weathering index of each sampling object with the element weathering potential energy index of the corresponding sampling object, and adjusting the area constant in the ideal model to enable the two absolute correlation coefficients of the element weathering potential energy index and the oxide weathering index to be more than a set value.
6. The device for determining the weathering potential energy index of rock while drilling in geological logging of claim 5, wherein the chemical element content is measured by an X-ray element logging instrument.
7. The device for determining the potential energy index of rock while drilling in a geological logging according to claim 5, wherein the oxide weathering index in the step B is calculated from the molar percentage of the oxidized minerals of the sample core, the oxide weathering index comprises a park weathering index WIP and/or a granite weathering index WIG, and the step C is to fit the park weathering index WIP to the park weathering potential energy index FWIP and fit the granite weathering index WIG to the granite weathering potential energy index FWIG during the fitting.
8. The apparatus for determining the weathering potential energy index of rock while drilling in geological logging of claim 5, wherein the set value in the step C is 0.9.
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