CN110850505B - Shale pencil stone belt division model establishing method and shale pencil stone belt division method - Google Patents
Shale pencil stone belt division model establishing method and shale pencil stone belt division method Download PDFInfo
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- CN110850505B CN110850505B CN201910987925.2A CN201910987925A CN110850505B CN 110850505 B CN110850505 B CN 110850505B CN 201910987925 A CN201910987925 A CN 201910987925A CN 110850505 B CN110850505 B CN 110850505B
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- 239000004575 stone Substances 0.000 title claims abstract description 164
- 238000000034 method Methods 0.000 title claims abstract description 44
- 230000008859 change Effects 0.000 claims abstract description 15
- 238000005192 partition Methods 0.000 claims description 15
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 230000004044 response Effects 0.000 claims description 4
- 229910052710 silicon Inorganic materials 0.000 claims description 4
- 239000010703 silicon Substances 0.000 claims description 4
- 238000000638 solvent extraction Methods 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 claims 1
- 239000011435 rock Substances 0.000 abstract description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 239000005416 organic matter Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000008186 active pharmaceutical agent Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000009897 systematic effect Effects 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 239000002775 capsule Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000010206 sensitivity analysis Methods 0.000 description 1
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- G01V20/00—
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V11/00—Prospecting or detecting by methods combining techniques covered by two or more of main groups G01V1/00 - G01V9/00
Abstract
The application relates to a shale pencil stone belt division model establishing method and a shale pencil stone belt division method, wherein the shale pencil stone belt division model establishing method comprises the following steps: performing pencil-stone belt division on the key well based on the characteristic pencil stone of the key well to obtain the pencil-stone belts contained in the key well and the position depth of the boundary of the pencil-stone belts; corresponding a plurality of logging curves of the key well to the position depths of the pencil-stone belt and the pencil-stone belt boundary according to the depths; analyzing the characteristic change of a plurality of logging curves at the boundary of the pencil-stone belt, and selecting a plurality of logging curves for dividing the pencil-stone belt into models; and corresponding the pencil-stone belt, the position depth of the boundary of the pencil-stone belt and the plurality of well logging curves for the pencil-stone belt division model according to the depth to obtain the pencil-stone belt division model. The shale rock zone dividing method uses the model to divide the rock zone of the uncalled well. The method realizes the division of the wells without cores and solves the problem that the pencil stone belt with unobvious natural gamma curve characteristics cannot be accurately divided.
Description
Technical Field
The application relates to the field of shale stratum division, in particular to a shale pencil stone belt division model establishing method and a shale pencil stone belt division method.
Background
Shale gas refers to natural gas aggregates that reside primarily in dark or high-carbon shale, primarily in adsorbed or free states. The main force layer system is determined based on the shale stratum dividing result, and the main force layer system is the key work of geological research in the early development stage of the shale gas layer. And (3) the penny stone biological fossil in the sea-phase shale stratum develops, different penny stone biological categories correspond to different stratum ages, the stratum marking penny stone category is determined, and the stratum where the well section is located can be obtained by observing the penny stone biological fossil according to the core of the coring well.
However, the existing pencil-string classification method is based on core description of the coring well and natural gamma curve characteristic classification. The uncancelled well and the lithostrip with unobvious natural gamma curve characteristics cannot be accurately divided.
Disclosure of Invention
In order to solve the technical problem or at least partially solve the technical problem, the application provides a shale pencil stone belt division model establishing method and a shale pencil stone belt division method.
In a first aspect, the application provides a shale pencil-stone belt partition model establishing method, including: performing pencil-stone belt division on the key well based on the characteristic pencil stone of the key well to obtain the pencil-stone belts contained in the key well and the position depth of the boundary of the pencil-stone belts; corresponding a plurality of logging curves of the key well to the position depths of the pencil-stone belt and the pencil-stone belt boundary according to the depths; analyzing the characteristic change of a plurality of logging curves at the boundary of the pencil-stone belt, and selecting a plurality of logging curves for dividing the pencil-stone belt into models; and corresponding the pencil-stone belt, the position depth of the boundary of the pencil-stone belt and a plurality of well logging curves for the pencil-stone belt division model according to the depth to obtain the pencil-stone belt division model.
In some embodiments, analyzing characteristic variations of the plurality of well logs at the boundaries of the pencil stone band, selecting the plurality of well logs for the pencil stone band partitioning model, comprises: and selecting the logging curve with the amplitude and/or shape change reaching the preset condition as the logging curve for the pencil-stone belt division model according to the logging response characteristics of the logging curve to the pencil-stone belt based on the position depth of the pencil-stone belt boundary.
In some embodiments, the plurality of well logs comprises: natural gamma curves, uranium-free gamma curves, resistivity curves, neutron curves, density curves, sonic moveout curves, and elemental logs.
In some embodiments, the characteristics of the log include: the amplitude and shape of the log.
In some embodiments, the pencil-stone belt partition modeling method is used for shale containing organic matter.
In certain embodiments, the elemental log includes plots of elemental calcium content, elemental silicon content, and elemental aluminum content.
In some embodiments, analyzing the characteristic changes of the plurality of well logs at the pencil stone band boundaries comprises: and respectively analyzing the characteristic change of each logging curve at the boundary of the pencil stone belt, and/or analyzing the characteristic change of the combination of at least two logging curves at the boundary of the pencil stone belt.
In a second aspect, the application provides a shale pencil stone belt dividing method, including: obtaining a plurality of first well logging curves corresponding to the pencil and stone belt division model in the well logging curves of the uncalled well, wherein the pencil and stone belt division model corresponds the pencil and stone belt, the position depth of the boundary of the pencil and stone belt and a plurality of second well logging curves used for the pencil and stone belt division model according to the depth; and determining the position depth of the pencil belt and the pencil belt boundary contained in the uncalculated well based on the characteristic changes of the first logging curves and the second logging curves by using a pencil belt dividing model, wherein the characteristic changes comprise the changes of the amplitude and the shape of the logging curves.
In some embodiments, the first plurality of logs and the second plurality of logs comprise: natural gamma curves, uranium-free gamma curves, resistivity curves, neutron curves, density curves, sonic moveout curves, and elemental logs.
In some embodiments, the pencil-stone belt partition modeling method is used for shale containing organic matter.
Compared with the prior art, the technical scheme provided by the embodiment of the application has the following advantages: according to the embodiment, the pencil-stone belt division model is established according to the pencil-stone belt division result of the core well, and the division of the pencil-stone belt of the non-core well is realized. In addition, the embodiment is divided based on a plurality of logging curves, so that the problem that the pen stone belt with unobvious natural gamma curve characteristics cannot be divided accurately in the related technology is solved, and an accurate division result is obtained.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
Fig. 1 is a flowchart of an implementation manner of a shale pencil-stone belt partition model establishing method according to an embodiment of the present application;
fig. 2 is a flowchart of an implementation manner of a shale pencil-stone ribbon dividing method provided in an embodiment of the present application; and
fig. 3 is a schematic diagram of an example of a pen-stone ribbon partition model according to an embodiment of the present application.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the following description, suffixes such as "module", "component", or "unit" used to denote elements are used only for facilitating the explanation of the present invention, and have no specific meaning in itself. Thus, "module", "component" or "unit" may be used mixedly.
In the embodiment, based on core observation, the pencil stone belts are divided by characteristic pencil stones; analyzing the logging response characteristics of different lithostrips, and preferably selecting a logging curve sensitive to the lithostrips; establishing a characteristic relation between the rubble belt and each well logging curve to serve as a rubble belt division model; and dividing the pencil stone belts for the non-coring wells by using a pencil stone belt dividing model. The embodiment is particularly suitable for shale containing organic substances.
The embodiment provides a shale pencil-stone belt partition model building method, as shown in fig. 1, the method includes steps S102 to S108.
And S102, dividing the key well into pencil and stone zones based on the characteristic pencil and stone of the key well to obtain the pencil and stone zones contained in the key well and the position depth of the boundary of the pencil and stone zones.
In this example, systematic coring was performed on shale containing organic matter with a coring yield of greater than 90%.
And step S104, corresponding the plurality of well logging curves of the key well to the position depths of the pencil-stone belt and the pencil-stone belt boundary according to the depths.
And S106, analyzing the characteristic changes of the plurality of logging curves at the boundary of the pencil-stone belt, and selecting the plurality of logging curves for the pencil-stone belt division model.
In some embodiments, the plurality of well logs comprises: natural gamma curves, uranium-free gamma curves, resistivity curves, neutron curves, density curves, sonic moveout curves, and elemental logs. In certain embodiments, the elemental log includes plots of elemental calcium content, elemental silicon content, and elemental aluminum content.
In some embodiments, the characteristics of the log include: the amplitude and shape of the log.
In some embodiments, in step S106, analyzing the characteristic variation of the plurality of well logs at the boundary of the pencil-stone ribbon, and selecting the plurality of well logs for the pencil-stone ribbon partition model includes: and selecting the logging curve with the amplitude and/or shape change reaching the preset condition as the logging curve for the pencil-stone belt division model according to the logging response characteristics of the logging curve to the pencil-stone belt based on the position depth of the pencil-stone belt boundary.
In some embodiments, analyzing the characteristic changes of the plurality of well logs at the boundary of the pencil stone band in step S106 includes: and respectively analyzing the characteristic change of each logging curve at the boundary of the pencil stone belt, and/or analyzing the characteristic change of the combination of at least two logging curves at the boundary of the pencil stone belt.
And S108, corresponding the position depth of the pencil-stone belt and the pencil-stone belt boundary and the plurality of well logging curves for the pencil-stone belt division model according to the depth to obtain the pencil-stone belt division model.
The embodiment provides a shale pencil-stone belt dividing method, which can adopt the pencil-stone belt dividing model. As shown in fig. 2, the method includes steps S202 to S204.
Step S202, a plurality of first well logging curves corresponding to the pencil and stone belt division model in the well logging curves of the uncalled wells are obtained, wherein the pencil and stone belt division model corresponds the pencil and stone belt, the position depth of the boundary of the pencil and stone belt and a plurality of second well logging curves used for the pencil and stone belt division model according to the depth.
And S204, determining the position depth of the pencil-stone belt and the pencil-stone belt boundary contained in the uncalculated well based on the characteristic changes of the plurality of first logging curves and the plurality of second logging curves by using a pencil-stone belt division model, wherein the characteristic changes comprise the changes of the amplitude and the shape of the logging curves.
In some embodiments, the first plurality of logs and the second plurality of logs comprise: natural gamma curves, uranium-free gamma curves, resistivity curves, neutron curves, density curves, sonic moveout curves, and elemental logs.
The present embodiment is described below with reference to examples.
Step A: and selecting a key well.
And selecting a well with complete and accurate rock core and logging data as a key well. The key well selection principle is that systematic coring is carried out on the shale containing organic substances, and the coring yield is more than 90%. The logging data are complete, and the method is used for sensitivity analysis and establishing the characteristic relation between the pencil stone belt and each logging curve.
And B: well logging data for key wells is collected.
The logging data comprise natural gamma (GR, API), uranium-free gamma (KTH, API), resistivity (RT, omega. m), neutrons (CNL,%), density (DEN, g/cm3), sonic time difference (DT, mus/ft), elemental logging (CA,%, SI,%, AL,%, Mg,%, S,% and other elements), and all the data are integrated in an LAS format file according to the depth in sequence.
And C: and dividing the pencil stone belts by using the characteristic pencil stones through core observation.
In this example, the depth of the bottom boundary position of each stone belt is determined step by step from bottom to top:
kwan-yin bridge bottom boundary: the position of the mesochite is the bottom boundary of the kwan-yin bridge, and the position depth (m) is recorded.
LM1-3 bottom boundary: the position of the LM1 pencil stone with the characteristic pencil stone (sharpening pencil stone) is the LM1-3 bottom boundary, and the position depth (m) is recorded.
LM4 bottom boundary: the position of the LM4 pencil stone with the characteristic pencil stone (shaft capsule pencil stone) is the LM4 bottom boundary, and the position depth (m) is recorded.
LM5 bottom boundary: the position of the LM5 pencil stone with the characteristic pencil stone (curved back and crown pencil stone) is the LM5 bottom boundary, and the position depth (m) is recorded.
LM6 bottom boundary: the position of the LM6 pencil stone with the characteristic pencil stone (triangular half-rake pencil stone) is the LM6 bottom boundary, and the position depth (m) is recorded.
LM7 bottom boundary: the position of the LM7 pencil stone with the characteristic pencil stone (spiral trumpet pencil stone) is the LM7 bottom boundary, and the position depth (m) is recorded.
LM8 bottom boundary: the position of the LM6 pencil stone with the characteristic pencil stone (Saishi giant spiny pencil stone) is the LM8 bottom boundary, and the position depth (m) is recorded.
LM9 bottom boundary: the position of LM6 pencil stone with characteristic pencil stone (Gehrig spiral pencil stone) is LM9 bottom boundary, and the position depth (m) is recorded.
Step D: and (6) analyzing sensitivity of the logging data.
Based on the depth position recorded by the dividing result of the pencil-stone belts, and in combination with the logging response principle, the logging curve sensitive to the pencil-stone belts is preferably selected according to the analysis of the logging data on the response characteristics of different pencil-stone belts.
The depth of a pencil stone zone divided by a key well core, natural gamma (GR, API) in a logging curve, uranium-free gamma (KTH, API), resistivity (RT, omega. m), neutron (CNL,%), density (DEN, g/cm3), sonic time difference (DT, mu S/ft), element logging (CA,%, SI,%, AL,%, Mg,%, S,% and the like) are sequentially displayed in the same graph. Wherein the neutron-density curve and the element logging data are respectively displayed on the same curve track.
And analyzing the change characteristics of the amplitude and the form of the well logging curve at the boundary of the pencil stone belt. The sensitive curve is formed by the fact that the upper and lower well logging curves (including numerical values and forms) of the pencil stone belt limit are changed remarkably. And contrast analysis determines that the sensitivity curves of the remote regions are natural gamma, uranium-free gamma, resistivity, neutrons, density, calcium CA, silicon SI and aluminum AL in element logging.
Step E: and establishing a pen stone belt division model. The model includes the name of the rubble strip, the preferred well log, and the characteristic rubbles of the different rubble strips.
By way of example, the model for dividing a penny zone in the Weekremote area is shown in FIG. 3. In FIG. 3, GR is the natural gamma, in API; KTH is uranium-free gamma, and the unit is API; RT is deep detection resistivity, and the unit is omega m; DEN is density, in g/m 3; CNL is neutron, unit is%; ca is the content of calcium element, and the unit is; si is the content of silicon element, and the unit is%; al is the content of aluminum element, and the unit is%; the core photo is different pencils and pencils with characteristics.
Step F: dividing the non-coring well pencil stone belt.
Well log data for uncased wells to be analysed is collected. The logging data include natural gamma (GR, API), uranium-free gamma (KTH, API), resistivity (RT, Ω · m), neutron (CNL,%), density (DEN, g/cm3), elemental logging (CA,%, SI,%, AL,%), and all data are integrated in depth order in one LAS format file.
And dividing the non-coring well by using a pencil-stone belt division model.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A shale pencil-stone belt division model building method is characterized by comprising the following steps:
performing pencil and stone belt division on the key well based on the characteristic pencil and stone of the key well to obtain the pencil and stone belt contained in the key well and the position depth of the boundary of the pencil and stone belt;
corresponding the plurality of logging curves of the key well to the position depths of the pencil-stone belt and the pencil-stone belt boundary according to the depths;
analyzing the characteristic change of the plurality of logging curves at the boundary of the rubble belt, and selecting the plurality of logging curves for the rubble belt division model, wherein the method specifically comprises the following steps: selecting a logging curve with the amplitude and/or shape change reaching preset conditions as a logging curve for a pencil-stone belt division model according to the logging response characteristics of the logging curve to the pencil-stone belt based on the position depth of the pencil-stone belt boundary; and
and corresponding the position depth of the pencil-stone belt and the pencil-stone belt boundary and the plurality of well logging curves for the pencil-stone belt division model according to the depth to obtain the pencil-stone belt division model.
2. The shale pencil-stone belt partition model building method of claim 1, wherein analyzing characteristic changes of the plurality of well logging curves at pencil-stone belt boundaries comprises: and respectively analyzing the characteristic change of each logging curve at the boundary of the pencil stone belt, and/or analyzing the characteristic change of the combination of at least two logging curves at the boundary of the pencil stone belt.
3. The shale pencil-stone belt partition model building method of claim 1 or 2, wherein the plurality of well logs for the pencil-stone belt partition model are selected from: natural gamma curves, uranium-free gamma curves, resistivity curves, neutron curves, density curves, sonic moveout curves, and elemental logs.
4. The shale pencil and stone belt partition model building method according to claim 1 or 2, wherein the characteristics of the well log curve comprise: the amplitude and shape of the log.
5. The shale pencil-stone belt partition model building method according to claim 1 or 2, wherein the pencil-stone belt partition model building method is used for shale containing organic substances.
6. The shale pencil stone belt partition model building method of claim 3, wherein the element log comprises curves of calcium element content, silicon element content and aluminum element content.
7. The shale pencil-stone belt partition model building method according to claim 1 or 2, wherein analyzing characteristic changes of the plurality of well logging curves at pencil-stone belt boundaries comprises: and respectively analyzing the characteristic change of each logging curve at the boundary of the pencil stone belt, and/or analyzing the characteristic change of the combination of at least two logging curves at the boundary of the pencil stone belt.
8. A shale pencil stone belt dividing method is characterized by comprising the following steps:
obtaining a plurality of first well logging curves corresponding to a pencil and stone belt division model in the well logging curves of the uncalled wells, wherein the pencil and stone belt division model corresponds pencil and stone belts, position depths of pencil and stone belt boundaries and a plurality of second well logging curves used for the pencil and stone belt division model according to depths;
determining, using the litho-strip compartmentalization model, a location depth of litho-strips and litho-strip boundaries contained by the uncalcined well based on a characteristic variation of the first and second plurality of well logs, wherein the characteristic variation includes a variation in amplitude and shape of the well logs.
9. The shale pencil stone belt partitioning method of claim 8, wherein the plurality of second well logs are selected from the group consisting of: natural gamma curves, uranium-free gamma curves, resistivity curves, neutron curves, density curves, sonic moveout curves, and elemental logs.
10. The shale pencil-stone belt partitioning method according to claim 8 or 9, wherein the pencil-stone belt partitioning model establishing method is used for shale containing organic substances.
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