CN112526633B - Volcanic rock weathering crust structure dividing method - Google Patents
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- 239000011435 rock Substances 0.000 title claims abstract description 63
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- 230000004044 response Effects 0.000 claims abstract description 10
- 238000004458 analytical method Methods 0.000 claims description 23
- 239000004927 clay Substances 0.000 claims description 21
- 230000008859 change Effects 0.000 claims description 20
- 238000002386 leaching Methods 0.000 claims description 14
- 239000013256 coordination polymer Substances 0.000 claims description 9
- 238000004626 scanning electron microscopy Methods 0.000 claims description 9
- 238000003825 pressing Methods 0.000 claims description 8
- 238000012937 correction Methods 0.000 claims description 6
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 5
- 230000005389 magnetism Effects 0.000 claims description 5
- 239000011707 mineral Substances 0.000 claims description 5
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- 238000006460 hydrolysis reaction Methods 0.000 claims description 4
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 claims description 4
- 229910052753 mercury Inorganic materials 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
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- 239000003365 glass fiber Substances 0.000 claims description 3
- 230000003301 hydrolyzing effect Effects 0.000 claims description 3
- 238000006253 efflorescence Methods 0.000 claims description 2
- 206010037844 rash Diseases 0.000 claims 1
- 239000003208 petroleum Substances 0.000 abstract description 6
- 238000011158 quantitative evaluation Methods 0.000 abstract description 6
- 239000003921 oil Substances 0.000 description 19
- 230000000694 effects Effects 0.000 description 4
- 230000000704 physical effect Effects 0.000 description 4
- 239000002734 clay mineral Substances 0.000 description 3
- 238000003384 imaging method Methods 0.000 description 3
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Abstract
The application provides a volcanic rock weathering crust structure dividing method, which comprises the following steps of S1: selecting a core of a plurality of volcanic rock top weathered shells, analyzing the core to determine each structural band characteristic of the volcanic rock weathered shells, analyzing response characteristics of each structural band on a logging curve, and determining a sensitive logging curve capable of reflecting the characteristics of each structural band; step S2: establishing a calculation model of a volcanic weathering crust reservoir development index; step S3: establishing a calculation model of a volcanic weathered reservoir pore structure index; step S4: constructing a calculation model of the comprehensive index of the volcanic weathering crust reservoir by using the development index of the volcanic weathering crust reservoir and the pore structure index of the volcanic weathering crust reservoir; step S5: and establishing a quantitative division plate of each structural band by utilizing the comprehensive index of the volcanic weathering crust reservoir and the volcanic clayey index, and dividing the weathering crust structure of the volcanic. The application solves the problem that quantitative evaluation of the internal structural characteristics of the weathering crust is lacking in petroleum exploration.
Description
Technical Field
The application relates to the technical field of volcanic complex reservoir logging evaluation in petroleum exploration, in particular to a volcanic weathering crust structure dividing method.
Background
Volcanic rock oil reservoirs are important unconventional oil and gas resources and become an important field for exploration and development of global oil and gas resources. At present, a plurality of high-yield volcanic oil and gas reservoirs are discovered in the Pascal basin, and the volcanic oil and gas reservoirs are marked to have huge exploration potential.
Compared with the volcanic rock which is not weathered, the volcanic rock which is weathered and modified is easier to form a favorable reservoir and a high-yield oil and gas reservoir, so that the research of the volcanic rock weathered crust has important significance for guiding the oil and gas exploration of the volcanic rock. At present, the research on volcanic rock weathered crust is less, and the research is mainly concentrated in the oil and gas reservoirs of the volcanic rock in the northeast of China. The prior art has studied the pore formation, distribution, development mode of the weathered crust of the Songliao basin volcanic rock, but the evaluation of the logging of the internal structural features of the weathered crust is lacking, and compared with the weathered crust of the ancient volcanic rock of the Songliao basin, the differences exist in the aspects of the weathering time, the thickness of the weathered crust, the structure of the weathered crust, the influence of the weathered crust on a reservoir, and the like. Meanwhile, in the turning area of the Pascal basin, important findings are obtained in the exploration of the weathering crust at the top of the carbocoal system in recent years, the resource quantity of the entrapment reaches hundred million tons, and the exploration prospect of the layer is shown.
That is, the prior art has the problem that quantitative evaluation of the internal structural characteristics of the weathered crust is lacking in petroleum exploration.
Disclosure of Invention
The application mainly aims to provide a volcanic rock weathering crust structure dividing method, which aims to solve the problem that quantitative evaluation of internal structural features of weathering crust is lacking in petroleum exploration in the prior art.
In order to achieve the above object, according to one aspect of the present application, there is provided a volcanic rock weathering crust structure dividing method including the steps of: step S1: selecting a core of a plurality of volcanic rock top weathered shells, carrying out sheet identification, scanning electron microscopy, mercury-pressing analysis data and ESC element content characteristic analysis on the core, determining each structural band characteristic of the volcanic rock weathered shells, analyzing response characteristics of each structural band on a logging curve, and determining a sensitive logging curve capable of reflecting each structural band characteristic; step S2: establishing a calculation model of the reservoir development index of the volcanic weathered shell by using the sensitive logging curve; step S3: establishing a calculation model of the reservoir pore structure index of the volcanic weathered shell by using nuclear magnetic logging data and a sensitive logging curve; step S4: constructing a calculation model of the comprehensive index of the volcanic weathering crust reservoir, which can comprehensively reflect the structural characteristics of the weathering crust reservoir of the volcanic, by using the development index of the volcanic weathering crust reservoir and the pore structure index of the volcanic weathering crust reservoir; step S5: and establishing a quantitative division plate of each structural band by utilizing the comprehensive index of the volcanic weathering crust reservoir and the volcanic clayey index, and dividing the weathering crust structure of the volcanic.
Further, in step S1, sheet identification, scanning electron microscopy, mercury intrusion analysis data and ESC element content feature analysis are performed on the core, and the weathered shell is divided into four structural bands by analyzing the clay content, the pore crack development degree, and the element mineral composition.
Further, the four structural bands are a weathered clay band, a hydrolysis band, a leaching band and a disintegration band.
Further, the calculation model of the weathering crust reservoir development index is:
Cr＝(Δρ b -Δρ)/Δρ m -(1-GR/GR b ) Formula (1)
Wherein Cr is the volcanic weathered crust reservoir development index, and the unit is A; Δρ is the density log of the interval to be treated in g/cm 3 ；Δρ b Is the density well-logging value of the non-weathered volcanic rock, and the unit is g/cm 3 ；Δρ m Is volcanic skeleton density value, and the unit is g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the GR is the natural gamma of the interval to be treated, and the unit is API; GR (glass fibre reinforced plastics) b Is the natural gamma of an un-weathered volcanic rock in units of API.
Further, the calculation model of the volcanic weathered reservoir pore structure index is as follows:
Pr＝[(PHI min +φ b )-SIG]/(PHI max -PHI min ) Formula (2)
Pr is the pore structure index of the volcanic weathered reservoir, and the unit is B; phi (phi) b Porosity in non-weathered volcanic rock; PHI (PHI) max The maximum value of the effective holes of the core magnetism of the non-weathered volcanic rock is expressed as a unit; PHI (PHI) min The unit is the minimum value of the effective holes of the core magnetism of the non-weathered volcanic rock; SIG is the total porosity of nuclear magnetism, in%.
Further, the calculation model of the comprehensive index of the volcanic weathered reservoir is as follows:
cp=cr-Pr formula (3)
Wherein, CP is the comprehensive index of volcanic weathered reservoir, and the unit is C.
Further, the calculation model of the volcanic clayey index is as follows:
wherein S is volcanic clayization index, and the unit is D; AC is an acoustic logging value, and the unit is mu s/ft; CNL is neutron logging value, unit is; DEN is a density log in g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the Rt is a deep lateral log in Ω·m.
Further, in step S5, the volcanic clayey index calculation model is constructed by adding the weight correction coefficient in combination with the actual situation of the area where the volcanic is located.
Further, in step S5, dividing the plate according to the volcanic weathering crust reservoir comprehensive index and the volcanic clayey index, and when CP is less than 0.6 and S is less than 40, the plate is an unexplored volcanic parent rock; when CP is more than 0.6 and S is less than 40, the effective reservoir layer develops, cracks and erosion holes develop, and the effective reservoir layer is a leaching belt and a disintegrating belt; when 75 > S > 40, the reservoir is severely weathered and the fracture is substantially filled, being a hydrolytic zone; when S is more than 75, volcanic rock is weathered to a high degree and basically clayey, so that the volcanic rock is a weathered clay belt.
Further, in step S1, the volcanic rock undergoes weathering, which results in an increase in clay content and a change in pore structure, and the log is also changed, wherein the change in resistivity is represented by a decrease in resistivity; neutron porosity curve changes manifest as neutron porosity increases; the density profile change is manifested as a decrease in density value; the change of the acoustic wave time difference curve is expressed as the increase of the acoustic wave time difference; natural gamma curve variation manifests as an increase in gamma value; the change in the nuclear magnetic porosity curve is manifested as an increase in nuclear magnetic porosity.
By applying the technical scheme of the application, the volcanic rock weathering crust structure dividing method comprises the following steps: step S1: selecting a core of a plurality of volcanic rock top weathered shells, carrying out sheet identification, scanning electron microscopy, mercury-pressing analysis data and ESC element content characteristic analysis on the core, determining each structural band characteristic of the volcanic rock weathered shells, analyzing response characteristics of each structural band on a logging curve, and determining a sensitive logging curve capable of reflecting each structural band characteristic; step S2: establishing a calculation model of the reservoir development index of the volcanic weathered shell by using the sensitive logging curve; step S3: establishing a calculation model of the reservoir pore structure index of the volcanic weathered shell by using nuclear magnetic logging data and a sensitive logging curve; step S4: constructing a calculation model of the comprehensive index of the volcanic weathering crust reservoir, which can comprehensively reflect the structural characteristics of the weathering crust reservoir of the volcanic, by using the development index of the volcanic weathering crust reservoir and the pore structure index of the volcanic weathering crust reservoir; step S5: and establishing a quantitative division plate of each structural band by utilizing the comprehensive index of the volcanic weathering crust reservoir and the volcanic clayey index, and dividing the weathering crust structure of the volcanic.
The characteristics of each structural band are determined by carrying out sheet identification, scanning electron microscopy, mercury-pressing analysis data and ESC element content characteristic analysis on the core, and the logging curve which can reflect the characteristics of each structural band is selected as a sensitive logging curve because the response characteristics of each structural band on the logging curve are different. And establishing a model for calculating the development index of the volcanic weathered crust reservoir by using the data of the sensitive logging curve. The logging curve comprises nuclear magnetic logging, and a model for calculating the pore structure index of the volcanic weathered reservoir is established by using the nuclear magnetic logging data and the data of the sensitive logging curve. And constructing a model for calculating the comprehensive index of the volcanic weathered reservoir by using the volcanic weathered reservoir development index and the volcanic weathered reservoir pore structure index. The comprehensive index of the volcanic weathered crust reservoir and the volcanic clayey index of the area are utilized to establish quantitative division plates of each structural band so as to divide the weathered crust structure of the volcanic, thereby realizing quantitative evaluation of the volcanic weathered crust structure, greatly improving the positioning of the reservoir and enabling oil exploitation to be more convenient.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:
FIG. 1 illustrates a flow chart of a volcanic weathering crust structure partitioning method in accordance with an alternative embodiment of the present application; and
FIG. 2 shows a comprehensive characterization map of lithology, FMI imaging, clay content, and chemical element content of various layers of a weathered crust tape according to an alternative embodiment of the present application;
FIG. 3 is a graph showing the log response characteristics of structural zones of volcanic weathering crust according to an alternative embodiment of the present application;
FIG. 4 illustrates a weathered crust structure partitioning plate built with a weathered index according to an alternative embodiment of the present application;
FIG. 5 illustrates a single well weathering crust structure partitioning effect diagram of an alternative embodiment of the present application.
Detailed Description
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.
It is noted that all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs unless otherwise indicated.
In the present application, unless otherwise indicated, terms of orientation such as "upper, lower, top, bottom" are used generally with respect to the orientation shown in the drawings or with respect to the component itself in the vertical, upright or gravitational direction; also, for ease of understanding and description, "inner and outer" refers to inner and outer relative to the profile of each component itself, but the above-mentioned orientation terms are not intended to limit the present application.
The application provides a volcanic weathering crust structure dividing method, which aims to solve the problem that quantitative evaluation of internal structural features of weathering crust is lacking in petroleum exploration in the prior art.
As shown in fig. 1 to 5, the volcanic rock weathering crust structure dividing method includes the following steps: step S1: selecting a core of a plurality of volcanic rock top weathered shells, carrying out sheet identification, scanning electron microscopy, mercury-pressing analysis data and ESC element content characteristic analysis on the core, determining each structural band characteristic of the volcanic rock weathered shells, analyzing response characteristics of each structural band on a logging curve, and determining a sensitive logging curve capable of reflecting each structural band characteristic; step S2: establishing a calculation model of the reservoir development index of the volcanic weathered shell by using the sensitive logging curve; step S3: establishing a calculation model of the reservoir pore structure index of the volcanic weathered shell by using nuclear magnetic logging data and a sensitive logging curve; step S4: constructing a calculation model of the comprehensive index of the volcanic weathering crust reservoir, which can comprehensively reflect the structural characteristics of the weathering crust reservoir of the volcanic, by using the development index of the volcanic weathering crust reservoir and the pore structure index of the volcanic weathering crust reservoir; step S5: and establishing a quantitative division plate of each structural band by utilizing the comprehensive index of the volcanic weathering crust reservoir and the volcanic clayey index, and dividing the weathering crust structure of the volcanic.
The characteristics of each structural band are determined by carrying out sheet identification, scanning electron microscopy, mercury-pressing analysis data and ESC element content characteristic analysis on the core, and the logging curve which can reflect the characteristics of each structural band is selected as a sensitive logging curve because the response characteristics of each structural band on the logging curve are different. And establishing a model for calculating the development index of the volcanic weathered crust reservoir by using the data of the sensitive logging curve. The logging curve comprises nuclear magnetic logging, and a model for calculating the pore structure index of the volcanic weathered reservoir is established by using the nuclear magnetic logging data and the data of the sensitive logging curve. And constructing a model for calculating the comprehensive index of the volcanic weathered reservoir by using the volcanic weathered reservoir development index and the volcanic weathered reservoir pore structure index. The comprehensive index of the volcanic weathered crust reservoir and the volcanic clayey index of the area are utilized to establish quantitative division plates of each structural band so as to divide the weathered crust structure of the volcanic, thereby realizing quantitative evaluation of the volcanic weathered crust structure, greatly improving the positioning of the reservoir and enabling oil exploitation to be more convenient.
In the step S1, sheet identification, scanning electron microscopy, mercury pressing analysis data and ESC element content characteristic analysis are carried out on the rock core, and the weathered crust is divided into four structural bands by analyzing the clay content, the pore crack development degree and the element mineral composition. In the step S1, firstly, a core of volcanic rock weathered crust is selected, then the core is subjected to scanning electron microscope analysis, the weathered degree of the core is determined, and then the weathered crust is divided into four structural bands through FMI imaging characteristics, clay content and ECS oxide content. Figure 2 shows the characteristics of the individual structural bands on the core, scanning electron microscope, imaging, and differences in clay mineral content, chemical elements.
The log response characteristics shown in fig. 3 are comprehensive reflection of lithology, physical properties and oil content, and various curve characteristics change when the rock is weathered: various clay minerals produced by weathering can lead to reduced resistivity; an increase in clay content results in an increase in gamma value; when the weathering effect is strong, after the rock is leached and degraded, secondary pores such as cracks, corrosion holes and the like are generated, so that the neutron, density and acoustic three-porosity logging values are changed; the corresponding nuclear magnetic porosity affected by the reservoir pore structure will also change. Therefore, the resistivity, gamma and three-porosity well logging curves capable of reflecting characteristic changes of each structural band are preferably selected as sensitive well logging curves for evaluating the weathering crust. In addition, the features of the individual structural bands on the log, as well as the differences in pore throat structure, fracture, can be seen from fig. 3.
Specifically, the four structural bands are a weathered clay band, a hydrolysis band, a leaching band and a disintegrating band. Volcanic weathered shells are lamellar geologic bodies formed by physical and chemical weathering such as weathering and erosion of volcanic in the surface environment. Core data and logging data of a weathered interval are collected, and each layer of structure is analyzed from the aspects of petrology, mineralogy, element change and physical property by analyzing the combination and content of clay minerals, the development and filling condition of gap cracks, the geophysical and chemical characteristics of ECS element mineral components and the like through core analysis data, mercury pressing data, a scanning electron microscope and X-ray diffraction, and a weathered shell is sequentially divided into a weathered clay zone, a hydrolysis zone, a leaching zone and a disintegration zone from top to bottom. The leaching belt and the disintegrating belt have good oil storage function.
It should be noted that, since the leaching belt and the disintegrating belt are both good reservoir belts, in the present application, the leaching belt and the disintegrating belt are not distinguished.
The calculation model of the development index of the weathering crust reservoir is as follows:
Cr＝(Δρ b -Δρ)/Δρ m -(1-GR/GR b ) Formula (1)
Wherein Cr is the volcanic weathered crust reservoir development index, and the unit is A; Δρ is the density log of the interval to be treated in g/cm 3 ；Δρ b Is the density well-logging value of the non-weathered volcanic rock, and the unit is g/cm 3 ；Δρ m Is volcanic skeleton density value, and the unit is g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the GR is the natural gamma of the interval to be treated, and the unit is API; GR (glass fibre reinforced plastics) b Is the natural gamma of an un-weathered volcanic rock in units of API. As volcanic rock weathered crust in a region is basically the same lithology, analysis of the response characteristics of each logging curve of volcanic rock after the weathering shows that minerals such as clay and the like generated after the weathering can cause the increase of natural gamma value of a reservoir stratum, and the clay degree is positively correlated with neutrons and sound waves and negatively correlated with density. The higher the reservoir development index, the lower the degree of clayization of the volcanic weathered crust, and the more suitable for oil storage. The layer segments to be treated in the present application are meant to include top weathering crustThe well section, GR, is the actual natural gamma log value of the interval to be treated.
The calculation model of the volcanic weathered reservoir pore structure index is as follows:
Pr＝[(PHI min +φ b )-SIG]/(PHI max -PHI min ) Formula (2)
Pr is the pore structure index of the volcanic weathered reservoir, and the unit is B; phi (phi) b Porosity in non-weathered volcanic rock; PHI (PHI) max The maximum value of the effective holes of the core magnetism of the non-weathered volcanic rock is expressed as a unit; PHI (PHI) min The unit is the minimum value of the effective holes of the core magnetism of the non-weathered volcanic rock; SIG is the total porosity of nuclear magnetism, in%. The weathering leaching effect can change the pore structure of each structural band physical property of the weathering crust, so that a part of cracks and corrosion holes are developed in the weathering crust, and therefore, a porosity curve and a nuclear magnetic curve which can reflect the physical property structural characteristics of the reservoir are selected to establish the pore structure index of the reservoir of the volcanic weathering crust.
The calculation model of the comprehensive index of the volcanic weathering crust reservoir layer is as follows:
cp=cr-Pr formula (3)
Wherein, CP is the comprehensive index of volcanic weathered reservoir, and the unit is C. The oil storage capacity of the volcanic rock is determined by analysis of the volcanic rock weathered reservoir comprehensive index.
Further, the calculation model of the volcanic clayey index is as follows:
wherein S is volcanic clayization index, and the unit is D; AC is an acoustic logging value, and the unit is mu s/ft; CNL is neutron logging value, unit is; DEN is a density log in g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the Rt is a deep lateral log in Ω·m. The degree of weathering of the volcanic rock is determined by analysis of the volcanic clay index to further divide the structural band of the volcanic rock.
In step S5, the calculation model of the volcanic clariance index is constructed by adding the weight correction coefficient in combination with the actual situation of the area where the volcanic is located. Because the volcanic clay degree of each region is different, the weight correction coefficient of the region needs to be added when the volcanic weathering crust structure is divided for different regions, so that the accuracy of the structural band division is improved.
The weight correction coefficients in different regions do not change much, and the weight correction coefficients generally float between 0.8 and 1.2.
In step S5, dividing the plate according to the volcanic weathering crust reservoir comprehensive index and the volcanic clayey index (as shown in FIG. 4), and when CP is less than 0.6 and S is less than 40, the plate is an unexplored volcanic parent rock; when CP is more than 0.6 and S is less than 40, the effective reservoir layer develops, cracks and erosion holes develop, and the effective reservoir layer is a leaching belt and a disintegrating belt; when 75 > S > 40, the reservoir is severely weathered and the fracture is substantially filled, being a hydrolytic zone; when S is more than 75, volcanic rock is weathered to a high degree and basically clayey, so that the volcanic rock is a weathered clay belt. Each structural band can be quantitatively determined through the comprehensive index of the volcanic weathering crust reservoir and the volcanic clariation index, and further, the leaching band and the disintegrating band with more oil storage capacity are determined, so that petroleum is accurately taken from the leaching band and the disintegrating band.
As is apparent from fig. 4, the four structural bands can be well differentiated quantitatively by using the volcanic clayey index S and the volcanic weathering crust reservoir comprehensive index, so as to increase the accuracy of the four structural bands differentiation.
In step S1, the volcanic rock causes an increase in clay content and a change in pore structure after weathering, and the log is also changed, wherein the change in resistivity curve is represented by a decrease in resistivity; neutron porosity curve changes manifest as neutron porosity increases; the density profile change is manifested as a decrease in density value; the change of the acoustic wave time difference curve is expressed as the increase of the acoustic wave time difference; natural gamma curve variation manifests as an increase in gamma value; the change in the nuclear magnetic porosity curve is manifested as an increase in nuclear magnetic porosity.
FIG. 5 shows a single well weathering crust structure division effect plot, wherein the first trace is a natural gamma, well diameter, natural potential curve, the second trace is a depth trace, the third trace is a lithology section, the fourth trace is a dual-lateral resistivity curve, the fifth trace is a three-porosity curve, the sixth trace is a gas-measured all hydrocarbon composition curve, the seventh trace is a clayey index (i.e., a model calculated clay content curve), the eighth trace is a weathering crust reservoir development index Cr and a weathering crust physical pore structure index Pr trace, the ninth trace is a weathering crust reservoir comprehensive index (i.e., an envelope area of Cr and Pr), the tenth trace is a weathering crust structure band distribution, and the eleventh trace is a test oil structure trace. The volcanic shell structure belt at the top of the well is quantitatively divided through the built weathering index calculation model, the oil testing section is positioned in the leaching belt and the disintegrating belt, and the oil testing section is a good-quality reservoir belt of the weathering shell, so that the yield reaches industrial oil quantity and the yield is high, and the reliability of the method is verified.
It will be apparent that the embodiments described above are merely some, but not all, embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, shall fall within the scope of the present application.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the application described herein may be implemented in sequences other than those illustrated or otherwise described herein.
The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (4)
1. The volcanic rock weathered crust structure dividing method is characterized by comprising the following steps of:
step S1: selecting a core of a plurality of volcanic rock top weathered shells, carrying out sheet identification, scanning electron microscopy, mercury-pressing analysis data and ESC element content characteristic analysis on the core, determining each structural band characteristic of the volcanic rock weathered shells, analyzing response characteristics of each structural band on a logging curve, and determining a sensitive logging curve capable of reflecting the characteristics of each structural band;
step S2: establishing a calculation model of the reservoir development index of the volcanic weathered shell by using the sensitive logging curve;
step S3: establishing a calculation model of the reservoir pore structure index of the volcanic weathered shell by using nuclear magnetic logging information and the sensitive logging curve;
step S4: constructing a calculation model of the comprehensive index of the volcanic weathering crust reservoir, which can comprehensively reflect the structural characteristics of the weathering crust reservoir of the volcanic, by using the development index of the volcanic weathering crust reservoir and the pore structure index of the volcanic weathering crust reservoir;
step S5: establishing quantitative dividing plates of each structural band by utilizing the comprehensive index of the volcanic weathered crust reservoir and the volcanic clayey index, and dividing the weathered crust structure of the volcanic;
the calculation model of the development index of the weathering crust reservoir is as follows:
Cr=(Δρ b -Δρ)/Δρ m -(1-GR/GR b ) Formula (1)
Wherein Cr is a volcanic weathered crust reservoir development index; Δρ is the density log of the interval to be treated in g/cm 3 ；Δρ b Is the density well-logging value of the non-weathered volcanic rock, and the unit is g/cm 3 ；Δρ m Is volcanic skeleton density value, and the unit is g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the GR is the natural gamma of the interval to be treated, and the unit is API; GR (glass fibre reinforced plastics) b Natural gamma for non-weathered volcanic rock in units of API;
the volcanic weathered reservoir pore structure index calculation model is as follows:
Pr＝[(PHI min +φ b )-SIG]/(PHI max -PHI min ) Formula (2)
Wherein Pr is the pore structure index of the volcanic weathered reservoir; phi b is the porosity of the non-weathered volcanic rock in units of; PHImax is the maximum value of the effective pore of the core magnetic of the non-weathered volcanic rock, and the unit is; PHImin is the minimum value of the effective aperture of the core magnetism of the non-weathered volcanic rock, and the unit is; SIG is nuclear magnetic total porosity, and the unit is;
the volcanic weathered reservoir comprehensive index calculation model is as follows:
cp=cr-Pr formula (3)
Wherein CP is the volcanic weathered reservoir complex index;
the volcanic clayey index calculation model is as follows:
，
wherein S is volcanic clayization index; AC is an acoustic logging value, and the unit is mu s/ft; CNL is neutron logging value, unit is; DEN is a density log in g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the Rt is a deep lateral logging value, and the unit is omega.m;
the four structural bands are a weathered clay band, a hydrolysis band, a leaching band and a disintegrating band;
in step S5, dividing a plate according to the volcanic weathering crust reservoir comprehensive index and the volcanic clayey index, and when CP is less than 0.6 and S is less than 40, the plate is an unexplored volcanic parent rock; when CP is more than 0.6 and S is less than 40, the effective reservoir layer develops, cracks and erosion holes develop, the leaching belt and the disintegrating belt are formed; when 75 > S > 40, reservoir efflorescence is severe and the fracture is substantially filled, being the hydrolytic zone; when S > 75, the volcanic rock is weathered to a high degree and is basically clayey, and the weathered clay belt is formed.
2. The method according to claim 1, wherein in the step S1, the core is subjected to sheet identification, scanning electron microscopy, mercury intrusion analysis data and ESC element content characteristic analysis, and the weathered shell is divided into four structural bands by analyzing clay content, pore crack development degree, and element mineral composition.
3. The method of dividing volcanic weathering crust structure according to claim 1, wherein in step S5, the calculation model of volcanic clariance index is constructed by adding weight correction coefficients in combination with actual conditions of the region where the volcanic is located.
4. The method according to claim 1, wherein in the step S1, the volcanic rock is weathered to increase clay content and change pore structure, and the well-logging curve is changed, wherein the change of resistivity curve is represented by the decrease of resistivity; neutron porosity curve changes manifest as neutron porosity increases; the density profile change is manifested as a decrease in density value; the change of the acoustic wave time difference curve is expressed as the increase of the acoustic wave time difference; natural gamma curve variation manifests as an increase in gamma value; the change in the nuclear magnetic porosity curve is manifested as an increase in nuclear magnetic porosity.
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0151073A2 (en) * | 1984-01-26 | 1985-08-07 | Schlumberger Limited | Quantitative determination by elemental logging of subsurface formation properties |
| CN103645519A (en) * | 2013-12-17 | 2014-03-19 | 中国石油大学(华东) | Volcanic rock weathering crust identification and classification standard based oil and gas exploration method |
| CN103744109A (en) * | 2013-12-26 | 2014-04-23 | 中国石油天然气股份有限公司 | Method for identifying weathering crust structure of clastic rock in coverage area without well |
| CN105626058A (en) * | 2015-12-30 | 2016-06-01 | 中国石油天然气股份有限公司 | Method and device for determining development degree of reservoir karst |
| WO2016161914A1 (en) * | 2015-04-07 | 2016-10-13 | 四川行之智汇知识产权运营有限公司 | Method for predicting reservoir lithogenous phase using geology and logging information |
| CN107764973A (en) * | 2016-08-18 | 2018-03-06 | 郭强 | Sedimentary rock diagenetic stage analysis method |
| CN107829731A (en) * | 2017-11-06 | 2018-03-23 | 陈国军 | A kind of volcanic rock porosity correction method of clay alteration |
| CN109339773A (en) * | 2018-10-09 | 2019-02-15 | 中国地质大学（北京） | Based on conglomerate matrix content well logging porosity model and its construction method and application |
| CN109709301A (en) * | 2018-11-30 | 2019-05-03 | 中国石油天然气股份有限公司 | Method, device and system for determining distribution of fracture pore type tight sandstone reservoir |
| CN109826623A (en) * | 2019-03-22 | 2019-05-31 | 中国石油化工股份有限公司 | Knowledge method is sentenced in a kind of geophysical log of tight sandstone reservoir stratification seam |
-
2019
- 2019-09-18 CN CN201910880745.4A patent/CN112526633B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0151073A2 (en) * | 1984-01-26 | 1985-08-07 | Schlumberger Limited | Quantitative determination by elemental logging of subsurface formation properties |
| CN103645519A (en) * | 2013-12-17 | 2014-03-19 | 中国石油大学(华东) | Volcanic rock weathering crust identification and classification standard based oil and gas exploration method |
| CN103744109A (en) * | 2013-12-26 | 2014-04-23 | 中国石油天然气股份有限公司 | Method for identifying weathering crust structure of clastic rock in coverage area without well |
| WO2016161914A1 (en) * | 2015-04-07 | 2016-10-13 | 四川行之智汇知识产权运营有限公司 | Method for predicting reservoir lithogenous phase using geology and logging information |
| CN105626058A (en) * | 2015-12-30 | 2016-06-01 | 中国石油天然气股份有限公司 | Method and device for determining development degree of reservoir karst |
| CN107764973A (en) * | 2016-08-18 | 2018-03-06 | 郭强 | Sedimentary rock diagenetic stage analysis method |
| CN107829731A (en) * | 2017-11-06 | 2018-03-23 | 陈国军 | A kind of volcanic rock porosity correction method of clay alteration |
| CN109339773A (en) * | 2018-10-09 | 2019-02-15 | 中国地质大学（北京） | Based on conglomerate matrix content well logging porosity model and its construction method and application |
| CN109709301A (en) * | 2018-11-30 | 2019-05-03 | 中国石油天然气股份有限公司 | Method, device and system for determining distribution of fracture pore type tight sandstone reservoir |
| CN109826623A (en) * | 2019-03-22 | 2019-05-31 | 中国石油化工股份有限公司 | Knowledge method is sentenced in a kind of geophysical log of tight sandstone reservoir stratification seam |
Non-Patent Citations (1)
| Title |
|---|
| 柴达木盆地东坪地区基岩风化壳特征;伍劲 等;现代地质;第31卷(第1期);129-141页 * |
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