CN108732639B - Shale stratum isochronous comparison method and system - Google Patents
Shale stratum isochronous comparison method and system Download PDFInfo
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- CN108732639B CN108732639B CN201710250256.1A CN201710250256A CN108732639B CN 108732639 B CN108732639 B CN 108732639B CN 201710250256 A CN201710250256 A CN 201710250256A CN 108732639 B CN108732639 B CN 108732639B
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Abstract
The invention discloses a shale stratum isochronous comparison method and a shale stratum isochronous comparison system. The method comprises the following steps: accurately identifying the potassium porphyry rockfall based on a drilling core or field outcrop; determining a contrast marking based on the potassium porphyry; carrying out stratum layering and dating experiment tests based on the comparison marks, and determining the geological age of the potassium porphyry detritus at the top and bottom of each layer; and developing interwell or outcrop stratum isochronous comparison based on the comparison mark and the stratum layering, and further establishing an shale stratum area isochronous framework. The method fully utilizes the characteristic of potassium porphyry, and improves the fineness and the accuracy of the contrast of the shale stratum at the same time.
Description
Technical Field
The invention relates to the technical field of shale gas exploration and development, in particular to a shale stratum isochronous comparison method and system.
Background
At present, shale gas exploration and development are rapidly developed in China, the ocean shale stratum of Orotangsystem Wufeng group-lower Shizhu Longmaxi group in the Sichuan basin and peripheral areas becomes the main field of shale gas exploration and development in China, and Fuling, Changning and Wingyuan 3 shale gas fields and a plurality of Wufeng groups such as Pengshui, Fushun-Yongchuan and Longmaxi shale gas production areas are built. Only in the area of the coke dam, 3805.98 million parts of geological reserves have been proved, and 67.6 million parts of shale gas is produced accumulatively (by 2016 at the end of 6 months), which shows the huge exploration potential of shale gas of the Wufeng group-Longmaxi group, and the interval is still the most main exploration interval of each oil and gas company in the southern area at present. The research shows that the Wufeng group-Longmaxi group in the Sichuan basin and the peripheral area is a shale layer section consisting of siliceous shale, clayey shale, silty shale and other rocks, the thickness of a main force producing area is about 100m, and the shale layer section contains a plurality of potassium spot rockfall strips. The potassium bentonite is potassium-rich clay rock with illite and illite as main components, and is formed by depositing and forming rock and changing lime substances generated by volcanic eruption in geological history period under sea phase alkaline environment.
The shale formation of the quintet group of the Sichuan basin, the Longmaxi group, although not very thick (around 100 m), also experiences a lengthy settling time (around 9.49 Ma) due to slow settling rates. Research shows that although the overall lithology and color of the interval are similar, indexes such as organic matter abundance, gas content and the like of the shale deposited in different periods are greatly different, so that fine and accurate isochronous stratigraphic division and comparison are required to be performed in the interval. At present, methods for comparing stratum isochronism mainly include lithology comparison, sequence stratum comparison, biological stratum comparison and the like. The lithology comparison method is mainly used for comparing rock properties of strata in the same layer of different regions, but for a quincuncial group-Longmaxi group marine facies black shale stratum, the lithology change in the section is not obvious, and the comparability is poor. The sequence stratum comparison method is mainly used for comparison according to division of a system domain or identification of the gyrus, but the time span of the system domain is large, and the fine comparison requirement cannot be met; the identification of the gyrus mainly depends on lithology changes, but the requirement of accurate comparison cannot be met under the condition that the lithology changes are small. The biological stratum contrast method mainly carries out contrast according to the fossilized, but because fossilized are various, the workload is large, and the requirement on the preservation integrity of the fossilized is higher, once the fossilized is incomplete or the natural section containing the fossilized is not developed due to the limitation of the rock core and the field section, the contrast accuracy is greatly reduced. Therefore, it is necessary to provide a shale formation isochronal comparison method and system, which achieve a fine and precise comparison of the quintet-romanxi shale formation, thereby providing a basis for evaluating favorable exploration intervals and regions of shale gas.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The invention provides a shale stratum isochronous comparison method and a shale stratum isochronous comparison system, which can determine a comparison mark through a quantitative description result of potassium porphyry detritus, carry out stratum layering, and realize establishment of an isochronous framework of a shale stratum region through isochronous comparison.
According to an aspect of the present invention, a shale formation isochronism comparison method is provided, which includes: accurately identifying the potassium porphyry rockfall based on a drilling core or field outcrop; determining a contrast marking based on the potassium porphyry; carrying out stratum layering and dating experiment tests based on the comparison marks, and determining the geological age of the potassium porphyry detritus at the top and bottom of each layer; and carrying out interwell or outcrop stratum isochronous comparison based on the comparison mark and the stratum layering, and further establishing an shale stratum area isochronous framework.
According to another aspect of the present invention, there is provided a shale formation isochronal contrast system, comprising: a unit for accurately identifying potassium zonate lithology based on a well core or field outcrop; means for determining a contrast marker based on the potassium exfoliation; a unit for conducting stratigraphic layering and dating experimental tests based on the comparison markers, determining the geological age of the potassium porphyry at the top and bottom of each of the layers; and the unit is used for developing interwell or outcrop stratum isochronous contrast based on the contrast marks and the stratum layering so as to establish an isochronous grillwork of the shale stratum region.
The shale stratum isochronal contrast method provided by the invention utilizes special rock potassium bentonite in the shale stratum to perform stratum isochronal contrast, can perform fine and accurate isochronal contrast on a quintet group-Longmaxi group marine black shale stratum with small thickness, can effectively improve the fineness and the accuracy of the isochronal contrast, can provide a basic and effective stratum research method for Sichuan basin and peripheral quintet group-Longmaxi group marine shale gas exploration, and can provide a reliable basis for high-quality gassy shale stratum interval evaluation and favorable exploration area prediction by combining organic matter content and gassiness research.
The method and apparatus of the present invention have other features and advantages which will be apparent from or are set forth in detail in the accompanying drawings and the following detailed description, which are incorporated herein, and which together serve to explain certain principles of the invention.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent by describing in more detail exemplary embodiments thereof with reference to the attached drawings, in which like reference numerals generally represent like parts.
FIG. 1 shows a flow chart of the steps of a shale formation isochronal contrast method according to the present invention.
FIG. 2 shows a schematic diagram of a single well stratigraphic isochronous contrast lattice according to one embodiment of the present invention.
Detailed Description
The invention will be described in more detail below with reference to the accompanying drawings. While the preferred embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
Example 1
FIG. 1 shows a flow chart of the steps of a shale formation isochronal contrast method according to the present invention.
In this embodiment, the shale formation isochronal contrast method according to the present invention may include: step 101, accurately identifying potassium zonate lithology based on a drilling core or field outcrop; step 102, determining a contrast mark based on the potassium porphyry; 103, carrying out stratum layering and dating experiment tests based on the comparison marks, and determining the geological age of the potassium porphyry detritus at the top and the bottom of each layer; and 104, carrying out interwell or outcrop stratum isochronous comparison based on the comparison mark and the stratum layering, and further establishing an shale stratum area isochronous framework.
In the embodiment, the comparison mark is determined according to the quantitative description result of the potassium porphyry exfoliation rock, stratum layering is carried out, and the establishment of the shale stratum area isochronous grillwork is realized through isochronous comparison.
The specific steps of the shale formation isochronal contrast method according to the present invention are described in detail below.
Step 1: based on a well drilling core or field outcrop, the potassium zonate lithotomy is accurately identified.
And carrying out detailed observation on a drilling core or a field outcrop, and accurately identifying the potassium porphyry rockfall according to characteristics such as lithology, color and the like.
The potassium porphyry detritus is formed by volcanic eruption and volcanic ash deposition and alteration in geological history period, and the reflected geological period is short and accurate compared with the long shale deposition; the original source of the potassium porphyry detached rock is volcanic ash, so that the lithology and the color of the original source are greatly different from those of black shale, and the original source is easy to identify; the potassium porphyry rocky is little influenced by core coring and field outcrop weathering, and the operability of contrast development is strong.
Step 2: determining a comparison marker based on the potassium porphyry.
In one example, a comparison marker is determined by developing a quantitative description based on the potassium porphyry, the quantitative description comprising: and quantitatively counting the number of the potassium porphyry strips in the shale stratum, quantitatively measuring the thickness of each potassium porphyry strip, and quantitatively measuring the depth of each potassium porphyry strip and the distance from the potassium porphyry strip to the bottom boundary of the shale stratum.
"depth" refers to the actual buried depth of the potassium porphyritic zone as the stratum, i.e. the distance from the ground (well head); the distance from the bottom boundary of the shale stratum refers to the buried depth of the bottom boundary minus the buried depth of the potassium porphyry zone, and the other one can be obtained by calculating after knowing the depth or the distance from the bottom boundary of the shale stratum.
And step 3: and carrying out stratum layering and dating experiment tests based on the comparison marks, and determining the geological age of the potassium porphyry detritus at the top and the bottom of each layer.
In one example, the dating experimental test is a zircon dating experimental test.
Preferably, stratigraphic layering is carried out according to the determined comparison marks, and numbering is carried out from bottom to top.
The potassium bentonite contains zircon and other bentonite minerals capable of obtaining absolute isotope ages, and is a good carrier for obtaining the absolute age of a stratum, so that zircon dating experiment tests can be carried out on each potassium bentonite strip serving as a comparison mark, and the geological ages of the potassium bentonite at the top and the bottom of each layer are accurately determined.
In one example, the comparison marker is a feature combination consisting of a single potassium exfoliation strip, a single potassium exfoliation strip within a first threshold range from a selected lithologic segment, or a plurality of potassium exfoliation strips. Preferably, a single said potassium exfoliation strip may be a single potassium exfoliation strip of greater thickness than other potassium exfoliation strips, said greater thickness may be too thick or too thin.
Preferably, the first threshold range is 0-20cm, 5-18cm and 10-15 cm.
In one example, the combination of characteristics includes a combination of more than 3 of the potassium exfoliation strips with formation thickness within a second threshold range, or a combination of 2 of the potassium exfoliation strips with fixed spacing with formation thickness within a third threshold range.
Preferably, the second threshold range is 0.1-3m, 1-2.5m and 1.5-2 m; the third threshold range is preferably 0.1-1m and 0.3-0.8 m.
In one example, the combination of features may also be a combination of the only or small occurrence of the potassium porphyry exfoliation bands in large shale sections.
Compared with lithologic stratum comparison, sequence stratum comparison and biological stratum comparison, the potassium porphyry bedrock strip or the potassium porphyry bedrock strip combination is used as a comparison mark for carrying out stratum isochronous comparison, and the fineness is higher.
And 4, step 4: and developing interwell or outcrop stratum isochronous comparison based on the comparison mark and the stratum layering, and further establishing an shale stratum area isochronous framework.
The shale stratum and stratum isochronism comparison method provided by the invention utilizes the special potassium rock in the shale stratum to perform stratum isochronism comparison, can realize fine comparison, has high comparison accuracy, and has the advantages of good identification and strong operability by utilizing the potassium rock to perform isochronism comparison.
Application example
To facilitate understanding of the solution of the embodiments of the present invention and the effects thereof, a specific application example is given below. It will be understood by those skilled in the art that this example is merely for the purpose of facilitating an understanding of the present invention and that any specific details thereof are not intended to limit the invention in any way.
FIG. 2 shows a schematic diagram of a single well stratigraphic isochronous contrast lattice according to one embodiment of the present invention.
The shale stratum isochronism comparison method provided by the invention is primarily applied to the south-east-Chuannan region of the Sichuan basin, and is mainly used for isochronism comparison of YY1 wells and YZ1 wells. As shown in fig. 2, the following are specific:
(1) respectively carrying out fine identification on potassium porphyry in shale strata of YY1 wells and YZ1 wells in a quincunx group-Longmaxi group, wherein 43 wells are identified in YY1, and 39 wells are identified in YZ 1;
(2) quantitatively describing the potassium porphyry identified by YY1 well and YZ1 well, including the thickness, depth and distance of the potassium porphyry strip relative to the bottom boundary of the shale stratum of the Wufeng group-Longmaxi group;
(3) determining the potassium porphyry exfoliation strips or combinations with obvious characteristics as comparison marks, wherein the obvious characteristics comprise: the thickness is larger, a few of the shale sections can be more than 4cm, the shale sections are close to the lithologic abrupt interface, the separation distance is fixed, and only or a small amount of the shale sections appear in the large-section shale section; 15 consistent comparison marks are determined for both wells; stratigraphic layering is carried out according to the comparison marks, and the two wells are divided into 14 layers;
(4) carrying out isochronous comparison on stratums between two wells, and initially establishing an isochronous grillwork of a Wufeng-Longmaxi shale stratum from the east China to the south China; the time-sharing framework well reveals the transverse variation characteristics of the layering deposition thickness of the quincunx group-the Longmaxi group from the east to the south of the Chuanzhong and the longitudinal evolution of the layering deposition thickness of the quincunx group to the Longmaxi group from the respective areas of the two wells, thereby achieving the purpose of carrying out fine and accurate stratum isochronous comparison.
It will be appreciated by persons skilled in the art that the above description of embodiments of the invention is intended only to illustrate the benefits of embodiments of the invention and is not intended to limit embodiments of the invention to any examples given.
Example 2
According to an embodiment of the present invention, there is provided a shale formation isochronism contrast system, the system including: a unit for accurately identifying potassium zonate lithology based on a well core or field outcrop; means for determining a contrast marker based on the potassium exfoliation; a unit for conducting stratigraphic layering and dating experimental tests based on the comparison markers, determining the geological age of the potassium porphyry at the top and bottom of each of the layers; and the unit is used for carrying out interwell or outcrop stratum isochronous comparison based on the comparison mark and the stratum layering so as to establish an isochronous framework of the shale stratum region.
In the embodiment, the comparison mark is determined according to the quantitative description result of the potassium porphyry exfoliation rock, stratum layering is carried out, and the establishment of the shale stratum area isochronous grillwork is realized through isochronous comparison.
In one example, a comparison marker is determined by developing a quantitative description based on the potassium porphyry, the quantitative description comprising: and quantitatively counting the number of the potassium porphyry strips in the shale stratum, quantitatively measuring the thickness of each potassium porphyry strip, and quantitatively measuring the depth of each potassium porphyry strip and the distance from the potassium porphyry strip to the bottom boundary of the shale stratum.
In one example, the comparison marker is a feature combination consisting of a single potassium exfoliation strip, a single potassium exfoliation strip within a first threshold range from a selected lithologic segment, or a plurality of potassium exfoliation strips.
In one example, the combination of characteristics includes a combination of more than 3 of the potassium exfoliation strips with formation thickness within a second threshold range, or a combination of 2 of the potassium exfoliation strips with fixed spacing with formation thickness within a third threshold range.
In one example, the dating experimental test is a zircon dating experimental test.
It will be appreciated by persons skilled in the art that the above description of embodiments of the invention is intended only to illustrate the benefits of embodiments of the invention and is not intended to limit embodiments of the invention to any examples given.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen in order to best explain the principles of the embodiments, the practical application, or improvements made to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (4)
1. A method for isochronism comparison of a shale formation, the method comprising:
accurately identifying the potassium porphyry rockfall based on a drilling core or field outcrop;
determining a contrast marking based on the potassium porphyry;
carrying out stratum layering and dating experiment tests based on the comparison marks, and determining the geological age of the potassium porphyry detritus at the top and bottom of each layer;
developing interwell or outcrop stratum isochronous contrast based on the contrast marks and the stratum layers, and further establishing shale stratum area isochronous grillage;
wherein a comparison marker is determined by performing a quantitative description based on the potassium porphyry, the quantitative description comprising: quantitatively counting the number of the potassium porphyry detritus in the shale stratum, quantitatively measuring the thickness of each potassium porphyry detritus, and quantitatively measuring the depth of a potassium porphyry detritus strip and the distance from the bottom boundary of the shale stratum;
the comparison mark is a characteristic combination consisting of a single potassium rockburst strip, a single potassium rockburst strip within a first threshold range from a selected lithologic segment or a plurality of potassium rockburst strips;
the characteristic combination comprises a combination of more than 3 potassium bentonite strips with stratum thickness within a second threshold range, or a combination of 2 potassium bentonite strips with fixed intervals, wherein the stratum thickness is within a third threshold range.
2. A shale formation isochronal contrast method as claimed in claim 1, wherein the dating experimental test is a zircon dating experimental test.
3. A shale formation isochronism contrast system, the system comprising:
a unit for accurately identifying potassium zonate lithology based on a well core or field outcrop;
means for determining a contrast marker based on the potassium exfoliation;
a unit for conducting stratigraphic layering and dating experimental tests based on the comparison markers, determining the geological age of the potassium porphyry at the top and bottom of each of the layers;
the unit is used for carrying out interwell or outcrop stratum isochronous comparison based on the comparison mark and the stratum layering so as to establish an isochronous grillwork of a shale stratum region;
wherein a comparison marker is determined by performing a quantitative description based on the potassium porphyry, the quantitative description comprising: quantitatively counting the number of the potassium porphyry detritus in the shale stratum, quantitatively measuring the thickness of each potassium porphyry detritus, and quantitatively measuring the depth of a potassium porphyry detritus strip and the distance from the bottom boundary of the shale stratum;
the comparison mark is a characteristic combination consisting of a single potassium rockburst strip, a single potassium rockburst strip within a first threshold range from a selected lithologic segment or a plurality of potassium rockburst strips;
the characteristic combination comprises a combination of more than 3 potassium bentonite strips with the stratum thickness within a second threshold range, or a combination of 2 potassium bentonite strips with fixed intervals, wherein the stratum thickness is within a third threshold range.
4. A shale formation isochronous contrast system as defined in claim 3, wherein the dating experimental test is a zircon dating experimental test.
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