CN111352162A - Shale stratum element phase dividing method and element phase evaluation method - Google Patents
Shale stratum element phase dividing method and element phase evaluation method Download PDFInfo
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Classifications
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- G—PHYSICS
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- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/40—Seismology; Seismic or acoustic prospecting or detecting specially adapted for well-logging
- G01V1/44—Seismology; Seismic or acoustic prospecting or detecting specially adapted for well-logging using generators and receivers in the same well
- G01V1/48—Processing data
- G01V1/50—Analysing data
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The invention provides a method for dividing shale section phases from a Wufeng group to a Longmaxi group and an evaluation method of element phases. The dividing method comprises the following steps: screening out characteristic elements from shale stratum data in the same block; establishing a division standard of element phases according to the relation between the characteristic elements and the deposition environment; and according to the division standard of element phases, carrying out element phase division on each layer section from the quincunx group to the Longmaxi group. The evaluation method may include: the method is adopted to divide element phases of all the sections from the quincunx group to the Longmaxi group, and the evaluation of reservoir parameters is carried out; and further realizing the evaluation of the divided element phases according to the evaluation of the reservoir parameters. The beneficial effects of the invention can include: the method can quickly judge the distribution condition of the favorable reservoir, realize the quick identification and evaluation work of the shale gas high-quality reservoir, and play a guiding role in exploration and development work such as sedimentary paleography recovery, favorable zone optimization, reservoir fracturing modification and the like.
Description
Technical Field
The invention relates to the field of geology, in particular to a method for dividing shale sections from a Wufeng group to a Longmaxi group into element phases and a method for evaluating the element phases.
Background
Shale gas is unconventional natural gas which is mainly stored in a reservoir rock system taking organic-rich shale as a main component, and is generated and stored integrally, and the organic-rich shale is both reservoir rock and hydrocarbon source rock. Different deposition environments have different deposition rates and ancient productivity, and control the mineral composition of the source rock, so the deposition environment is one of the main control factors for the development of the shale gas reservoir. The identification of depositional environments is often based on depositional signatures such as the type and composition of rocks, depositional structures, and biogenic rocks preserved in sedimentary rocks. The different contents of elements and the different rock minerals of the composition reflect the different deposition environments to a certain extent. With the development of the geochemistry discipline of elements and the interdisciplinary study of multiple disciplines, the research of depositional environments began to be quantitatively and deeply explored by virtue of the characteristics exhibited during the migration and aggregation of different elements during the deposition and diagenesis processes. Previous researches show that various major elements or trace elements have certain indication significance on the deposition environment, such as aluminum (Al), titanium (Ti), potassium (K), sodium (Na) and the like, and represent the input of terrestrial clastic substances; calcium (Ca), strontium (Sr), barium (Ba), etc., indicating typical carbonate deposits; the presence of manganese (Mn), cobalt (Co), nickel (Ni), copper (Cu), etc., indicates a significant increase in deep sea deposits; uranium (U) element and U/Th ratio, indicating an organic-rich deepwater environment. At present, although relevant researches on the relationship between the element geochemical characteristics of the shale gas reservoir and the deposition environment exist at home and abroad, no specific quantitative standard is formed, and no clear indication effect is played on the exploration and development of the shale gas.
Disclosure of Invention
In view of the deficiencies in the prior art, it is an object of the present invention to address one or more of the problems in the prior art as set forth above. For example, one of the purposes of the invention is to provide a method for dividing shale section element phases from quincunx groups to romanxi groups and an evaluation method of shale element phases so as to realize rapid identification of shale gas high-quality reservoirs.
In order to achieve the above object, the present invention provides a method for dividing shale section phases from Wufeng group to Longmaxi group. The method may comprise the steps of:
screening out characteristic elements from shale stratum data in the same block; establishing a division standard of element phases according to the relation between the characteristic elements and the deposition environment; and according to the division standard of element phases, carrying out element phase division on each layer section from the quincunx group to the Longmaxi group.
The invention further provides an evaluation method of the shale element phase. The evaluation method may comprise the steps of: dividing element phases and evaluating reservoir parameters of all the sections from the quincunx group to the Longmaxi group; according to the evaluation of the reservoir parameters, the evaluation of the divided element phases is further realized; the element phases are divided according to the method for dividing the shale section from the quincunx group to the romanxi group.
Compared with the prior art, the beneficial effects of the invention can include: the method is simple and convenient, can quickly judge the distribution condition of the favorable reservoir, can realize the quick identification and evaluation work of the shale gas high-quality reservoir, and can play a guiding role in exploration and development work such as sedimentary paleography recovery, favorable zone optimization, reservoir fracturing modification and the like.
Drawings
The above and other objects and features of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a schematic diagram showing the relationship of U element to TOC of a certain single well core;
FIG. 2 shows SiO in a mineral composition for a single well2With TiO2A schematic of the relationship;
FIG. 3 shows SiO in a mineral composition for a single well2And V2O5A schematic of the relationship;
FIG. 4 shows SiO in a mineral composition for a single well2And Cr2O3A schematic of the relationship;
FIG. 5 shows biogenic SiO measured for a block of core2Schematic of the relationship to TOC;
FIG. 6 is a graph showing the relationship between TOC and U/Th for a core analysis of a block;
FIG. 7 is a schematic diagram showing reservoir parameters versus element phase for a first well depth of a single well;
FIG. 8 is a schematic diagram showing reservoir parameters versus element phase for a second well depth of a single well;
FIG. 9 is a schematic diagram showing reservoir parameters versus element phase for a third well depth of a single well;
FIG. 10 is a schematic diagram showing reservoir parameters versus element phase for a fourth well depth of a single well;
FIG. 11 is a schematic diagram showing reservoir parameters versus element phase for a fifth well depth of a single well;
FIG. 12 shows a schematic of reservoir parameters versus element phase for a sixth well depth of a single well.
Detailed Description
Hereinafter, the method for dividing the shale section element phase from the quintet group to the romanxi group and the method for evaluating the shale element phase according to the present invention will be described in detail with reference to the accompanying drawings and exemplary embodiments. The first, second, third, fourth, fifth and sixth of the invention are not in sequence and are only used for distinguishing each other.
The invention provides a method for dividing shale section phases from Wufeng group to Longmaxi group on one hand. The invention provides a new definition aiming at shale element phases, which establishes a standard for dividing shale element phases from a quincunx group to a Longmaxi group by optimizing characteristic elements, and further realizes the division of each rock stratum element phase.
In an exemplary embodiment of the present invention, the method for partitioning the shale section element phases from the quintet group to the roman group may include the steps of:
s10: and screening out characteristic elements from shale stratum data in the same block.
S20: and establishing a division standard of the element phase according to the relation between the characteristic elements and the deposition environment.
S30: and according to the division standard of element phases, carrying out element phase division on each layer section from the quincunx group to the Longmaxi group.
In this embodiment, the data may include at least one of logging data, and formation cuttings analysis data, wherein the logging data includes drilled shale core and formation cuttings mineral analysis data. Further, the data may include: the well-drilled shale core, cuttings mineral analysis data, logging data, and cuttings elemental analysis data.
In this embodiment, the data may be obtained by common geological evaluation techniques such as element logging, or analytical testing. The method utilizes the logging while drilling element logging data to perform element phase analysis, and has the characteristics of low cost, full section and wide coverage.
In this embodiment, the data includes data from quintet to rampart within a tile.
In this embodiment, the data includes data of different single wells in the same block.
In this embodiment, the feature elements may include: at least one of Si, U, K, Ca, Th and Al. By way of example only:
the characteristic elements may include at least one of U, K, Ca and Al, such as any one thereof, and further such as two, three or four thereof;
alternatively, the characteristic elements may include Si and Al;
alternatively, the characteristic elements may include U, K and at least one of Ca, and Si and Al;
alternatively, the feature elements may include U and Th;
alternatively, the characteristic elements may include at least one of K, Ca and Al, and U and Th;
alternatively, the characteristic elements may include Si, Al, U, and Th;
alternatively, the characteristic elements may include at least one of K and Ca, and Si, Al, U, and Th;
alternatively, the characteristic elements may include Si, U, K, Ca, Th, and Al.
In this embodiment, the content of deposition micro-phases and elements can be statistically classified, or the index of deposition micro-phases and elements (e.g., U/Th, and B)Si) The statistical classification of (2) realizes the establishment of element phase division standards.
In the present embodiment, in the case where the feature element includes U, step S20 may include: dividing the content range of the U element into at least 2 first secondary ranges, such as 3, 4 or 5, according to the numerical distribution of the TOC and based on the corresponding relation between the U element and the TOC; at least 2 uranium phases are defined, the number of uranium phases being the same as the number of first secondary ranges and being able to correspond one to one. For example, the content range of the U element may be divided into 4 first-order ranges, and accordingly, the uranium phase may include a low uranium phase, a medium uranium phase, a high uranium phase, and an ultra-high uranium phase.
In the present embodiment, in the case where the feature element includes Ca, step S20 may include: dividing the content range of Ca element into at least 2 second secondary ranges, such as 3, 4 or 5, according to the brittleness of carbonate minerals; at least 2 calcium phases are defined, the calcium phases being equal in number to the second secondary range and being able to correspond one to one. For example, the content range of Ca element may be divided into 3 second-order ranges, and accordingly, the calcium phase may include a low calcium phase, a medium calcium phase, and a high calcium phase.
In the present embodiment, in the case where the feature element includes Al, step S20 may include: dividing the content range of the Al element into at least 2 third-order ranges, such as 3, 4 or 5, according to the brittleness of the carbonate minerals; at least 2 aluminum phases are defined, the number of aluminum phases being the same as the number of third order ranges and being able to correspond one to one. For example, the content range of Al element may be divided into 3 third-order ranges, and accordingly, the aluminum phase may include a low aluminum phase, a medium aluminum phase, and a high aluminum phase.
In the present embodiment, in the case where the feature element includes K, step S20 may include: dividing the content range of the K element into at least 2 fourth-order ranges, such as 3, 4 or 5, according to the content statistical classification of the sedimentary micro-phases and the potassium element; at least 2 potassium phases are defined, the number of potassium phases being the same as the number of fourth order ranges and being able to correspond one to one. For example, the content range of the K element is divided into 3 fourth order ranges, and accordingly, the potassium phase may include a low potassium phase, a medium potassium phase, and a high potassium phase.
In this embodiment, in the case where the feature elements include both U and Th, before the step of establishing the division criterion of the element phases, the method further includes the steps of: and calculating U/Th, wherein the U/Th is the ratio of the contents of the U element and the Th element.
Step S20 may include: dividing the range of the U/Th into at least 2 fifth-level ranges, such as 3, 4 or 5, according to the distribution of the ancient ocean redox environments and based on the corresponding relation between the U/Th and the ancient ocean redox environments; at least 2 redox phases are defined, the redox phases being equal in number to and capable of one-to-one correspondence with the fifth order ranges. For example, the range of U/Th may be divided into 3 fifth order ranges-for example, correspondingly, the redox phases may include shallow water oxidation phase, deep water weak reduction phase and deep water strong reduction phase.
In this embodiment, in the case where the characteristic elements include both Si and Al, the method further includes, before the step of establishing the division criterion of the element phase, the steps of: b is obtained by calculation according to formula 1 and formula 2Si，BSiIs the content index of the biological silicon element,
The formula 2 is:
wherein, CSiIs the Si content of the Wufeng group and the Longmaxi group, CAlIs the Al element content, R, of the Wufeng group and the Longmaxi groupbgIs the weighted average value of the content ratios of Si and Al elements in the non-reservoir section of the Longmaxi group, i isWell depth, Q, of different well logging from Wufeng group to Longmaxi groupiAnd the weighting coefficients are corrected for the logging data corresponding to different logging depths.
Step S20 may include: according to the deposition phase and BSiStatistical classification of size, BSiThe numerical range is divided into at least 2 sixth-order ranges, for example 3, 4 or 5; at least 2 silicon phases are defined, the number of silicon phases being the same as the sixth secondary range and being able to correspond one to one. For example, B may beSiThe numerical range is divided into 4 sixth order ranges, and accordingly, the silicon phases may include a terrestrial silicon phase, a low bio-silicon phase, a medium bio-silicon phase, and a high bio-silicon phase.
In this embodiment, the above-mentioned several corresponding element dividing steps can be selected according to the specific element types included in the feature elements.
For example, the feature elements include: in the case of Si, U, K, Ca, Th and Al, the method further comprises, before the step of establishing a division criterion of the elemental phases, the steps of: calculate the above U/Th, BSi。
Step S20 may include:
dividing the content range of the U element into at least 2 first secondary ranges according to the numerical distribution condition of the TOC and based on the corresponding relation between the U element and the TOC; at least 2 uranium phases are defined, the number of uranium phases being the same as the number of first secondary ranges and being able to correspond one to one.
Dividing the content range of Ca element into at least 2 second secondary ranges according to the brittleness of carbonate minerals; at least 2 calcium phases are defined, the calcium phases being equal in number to the second secondary range and being able to correspond one to one.
Dividing the content range of the Al element into at least 2 third-level ranges according to the brittleness of the carbonate minerals; at least 2 aluminum phases are defined, the number of aluminum phases being the same as the number of third order ranges and being able to correspond one to one.
Dividing the content range of the K element into at least 2 fourth-level ranges according to the content statistical classification of the sedimentary micro-phases and the potassium element; at least 2 potassium phases are defined, the number of potassium phases being the same as the number of fourth order ranges and being able to correspond one to one.
Dividing the range of U/Th into at least 2 fifth-level ranges according to the distribution condition of the ancient ocean redox environment and based on the corresponding relation between the U/Th and the ancient ocean redox environment; at least 2 redox phases are defined, the redox phases being equal in number to and capable of one-to-one correspondence with the fifth order ranges.
According to the deposition phase and BSiIs statistically classified into BSiThe numerical range is divided into at least 2 sixth-order ranges; at least 2 silicon phases are defined, the number of silicon phases being the same as the sixth secondary range and being able to correspond one to one.
In this embodiment, according to the division standard of the element phase, the step of dividing the element phase into the intervals from the quintet group to the roman group may include: element phase division is firstly carried out on each single well in the block, and then element phase division of the whole block is achieved.
In this embodiment, the correspondence relationship between the first secondary range and the uranium phase may be: the content of the U element is less than 5ppm corresponding to a low-uranium phase, more than or equal to 5 and less than 9ppm corresponding to a medium-uranium phase, 9-15 ppm corresponding to a high-uranium phase, and more than 15ppm corresponding to an ultrahigh-uranium phase.
In this embodiment, the correspondence relationship between the second secondary range and the calcium phase may be: the content of calcium element is less than 4% corresponding to low calcium phase, 4-10% corresponding to medium calcium phase, and more than 10% corresponding to high calcium phase.
In this embodiment, the correspondence relationship between the third secondary range and the aluminum phase may be: the content of the aluminum element is less than 4 percent and corresponds to a low aluminum phase, 4-10 percent and more than 10 percent corresponds to a medium aluminum phase, and the content of the aluminum element corresponds to a high aluminum phase.
In this embodiment, the corresponding relationship between the fourth order range and the potassium phase may be: the content of K element is less than 1.5% corresponding to low-potassium phase, 1.5-3% corresponding to medium-potassium phase, and more than 3% corresponding to high-potassium phase.
In this embodiment, the corresponding relationship between the fifth level range and U/Th may be: U/Th is less than 0.5 corresponding to shallow water oxidation phase, 0.5-1.25 corresponding to deep water weak reduction phase, and more than 1.25 corresponding to deep water strong reduction phase.
In this embodiment, the number of the sixth secondary ranges is 4, which are respectively: b isSi＜1％，1％≤BSi＜3％，3％≤BSi≤12％，BSiPercent is more than 12; the number of the silicon phases is also 4, which are respectively as follows: a terrestrial silicon phase, a low-biological silicon phase, a medium-biological silicon phase and a high-biological silicon phase;
wherein, BSiLess than 1 percent of the silicon phase corresponds to the land source silicon phase, and B is more than or equal to 1 percentSiLess than 3 percent of the phase corresponds to low biological silicon phase, and the content of B is more than or equal to 3 percentSiLess than or equal to 12 percent of corresponding biological silicon phase, BSi> 12% corresponds to a high bio-silicon phase.
In this embodiment, the content of U element in each interval from the quincunx group to the romanxi group in a single well may be compared with a plurality of first-order ranges, and the uranium phase to which each interval belongs may be determined.
The Ca element content of each interval from the quincunx group to the Longmaxi group in each single well can be compared with a plurality of second-level ranges, and then the calcium phase of each interval is determined.
The Al element content of each interval from the quincunx group to the Longmaxi group in each single well can be compared with a plurality of third-order ranges, and then the aluminum phase of each interval is determined.
The content of the K element in each interval from the quincunx group to the Longmaxi group in each single well can be compared with a plurality of fourth order ranges, and further the potassium phase of each interval is determined.
The U/Th value corresponding to each interval from the quincunx group to the Longmaxi group in each single well can be compared with a plurality of fifth grade ranges, and further the redox phase of each interval is determined.
The five peaks in each single well can be grouped to the B corresponding to each interval of the Longmaxi groupSiAnd comparing the value with a plurality of sixth-level ranges to further determine the silicon phase of each layer section.
In another exemplary embodiment of the present invention, the present invention is implemented by the following technical solutions:
(1) synthesizing the mineral analysis data of the drilled shale core and the rock debris and the element analysis data of the well logging and the rock debris in the same block, screening characteristic elements, and calculating BSiAnd U/Th.
① shale gas reservoir has close relation between U element and organic matter, TOC andthe U element content has a significant positive correlation, such as that shown in fig. 1. TOC is one of important parameters for evaluating the shale gas reservoir, and high TOC indicates that the shale gas reservoir is better. The U element characteristics of each layer section of the Longmaxi group are obvious, and the five peaks are combined to the Longyi1 4The content of small layer U is obviously higher than that of the upper middle layer of the Longmaxi group, wherein, the content of the dragon I is1 1The small layer has the highest U content. Thus, the U element may be one of the characteristic elements, indicating the TOC content.
② shale reservoir has low porosity and low permeability, and needs to be fractured by sand in large scale to form industrial capacity, the brittle mineral in shale is easy to crack under the action of external force, which is beneficial to the development of shale gas.
③ shale gas reservoir K element and organic matter are closely related1The sublegments are characterized in that the content of K elements and Th elements is low, the content of U elements is high, and the TOC and the content of the U elements have obvious positive correlation; the content of the element K in the Longmaxi group is gradually reduced from top to bottom. The classification can be made according to the deposition of micro relative potassium element.
④ the source of siliceous component in shale reservoir includes two kinds of continental source and biogenesis, while Ti, V, Cr and other elements are all originated from continental source debris, therefore, the continental source origin in mineral component is SiO2In an amount of TiO respectively2、V2O5、Cr2O3The contents are in a positive correlation, whereas the contents are in a correlation of significant proportions with respect to the biogenic SiO2Then a significant negative correlation is formed, such as the relationships shown in FIGS. 2, 3 and 4, wherein the line marked a in FIGS. 2-4 represents the biogenic SiO2Correlation with the corresponding substances, lines marked b represent SiO of origin2Correlation with corresponding substances. Five peaks combined into one dragon1 4Small layer of SiO2Mainly comprises biological formation, and the content of the biological formation is respectively equal to that of TiO2、V2O5、Cr2O3The content is in obvious negative correlation, and the rest layer is SiO2Mainly from terrestrial sources.
Biogenic siliceous shale is characterized by a relatively high TOC content, as shown in fig. 5. The siliceous shale with biological cause not only has high quartz content and good brittleness, but also has looser siliceous biological skeleton, is more easily corroded than terrestrial quartz in the early diagenesis stage, and the corroded silicon is precipitated among deposited particles in the form of cement to form a connected siliceous cementing system in the shale, and is preferentially broken to generate nanometer and micron communicated microcracks under the condition of artificial fracturing, so that a siliceous shale layer system is easy to fracture. The bottom of the Longmaxi group is rich in biogenic silica, and is a preferred target horizon for shale gas development, so that the calculation of the biogenic silica has important significance.
Content index B of biological silicon elementSiThe calculation method comprises the following steps:
establishing a content index B of the biological silicon elementSiCalculating a correlation model with the silicon element content of the stratum by using the method BSi. Content index B of biological silicon elementSiThe calculation formula is as follows:
BSi＝CSi-Rbg×CAlformula (2)
Wherein i is the different well logging depths from the Wufeng group to the Longmaxi group; cSiAnd CAlRespectively as follows: the contents of Si and Al elements of the Wufeng group and the Longmaxi group are as follows: percent (mass percent); q is a weighting coefficient after the logging data is corrected and is related to the physical parameters of the interval, QiWeighting coefficients after correcting logging data corresponding to different logging well depths; rbgFor each individual wellThe weighted average value of the Si/Al element content ratio of the non-reservoir section of the Longmaxi group is within the range of 2.6-3.6, and the average value is 3.1. Different individual wells, RbgMay be different.
⑤ under high ancient productivity, the strong anoxic reducing environment is more beneficial to the enrichment and preservation of organic matter, i.e. rich organic shale is formed in the anoxic environment, microelement U, Th is used as important index of ancient marine redox environment, and its ratio U/Th is commonly used in ancient redox condition judgment1 4The small shale core analysis shows that relatively good positive correlation exists between the TOC content and the U/Th ratio, and as shown in FIG. 6, the larger the U/Th ratio is, the more anoxic the deposition environment is, the more organic matter is preserved.
(3) Screening out the characteristic elements and calculating BSiAnd after U/Th, a quincunx-to-Longmaxi element phase division system is established according to element characteristics, and a division standard (see table 1) based on element phases is established by adopting element characteristics and a deposition environment, wherein the division standard is based on the quincunx-to-Longmaxi element phases, and the division standard is defined as uranium, potassium, calcium, aluminum, terrestrial silicon shallow water oxidation phases, uranium, potassium, calcium, aluminum, deepwater weak reduction phases and uranium, potassium, calcium, aluminum, deepwater strong reduction phases. Table 1 shows the criteria for division of the elements of the quintet-rampart group in the sikawa basin.
TABLE 1 Standard of element phase division from Wufeng group to Longmaxi group
Taking a weiyuan block quintet group-dragon rivulet group as an example, element phases are divided, and 31 element phases are divided in total, wherein the element phases are respectively as follows:
a low-uranium low-potassium low-calcium low-aluminum land-source silicon shallow water oxidation phase, a low-uranium low-potassium medium-calcium low-aluminum land-source silicon shallow water oxidation phase, a low-uranium high-potassium low-calcium medium-aluminum land-source silicon shallow water oxidation phase, a low-uranium medium-potassium low-calcium low-aluminum land-source silicon shallow water oxidation phase, a low-uranium medium-potassium low-calcium medium-aluminum land-source silicon shallow water oxidation phase, a low-uranium medium-potassium medium-calcium low-aluminum land-source silicon shallow water oxidation phase, a low-uranium medium-potassium medium-calcium medium-aluminum medium low-calcium land-source silicon shallow water oxidation phase, a high-uranium low-potassium low-calcium medium-aluminum medium low water weak reduction phase, a high-uranium low-potassium medium-calcium medium-aluminum medium low water weak reduction phase, a high-uranium medium-potassium low calcium medium-aluminum medium low water weak reduction phase, a high-uranium medium-potassium medium-calcium medium low calcium medium-aluminum medium low water weak reduction phase, a high-calcium medium-deep water weak reduction phase, a, Deep water weak reduction phase of biological silicon in aluminum in calcium in potassium in high uranium, deep water weak reduction phase of biological silicon in deep water in medium uranium, low potassium, low calcium and low aluminum, deep water weak reduction phase of biological silicon in calcium in low potassium in medium uranium, deep water weak reduction phase of biological silicon in deep water in calcium in low aluminum in low potassium in medium uranium, deep water weak reduction phase of biological silicon in high potassium, low calcium and low calcium in medium uranium, deep water weak reduction phase of biological silicon in potassium in high calcium and low aluminum in medium uranium, deep water weak reduction phase of biological silicon in calcium in low aluminum in medium potassium in medium uranium, deep water weak reduction phase of biological silicon in medium calcium in medium potassium in medium uranium, deep water weak reduction phase of biological silicon in calcium in medium aluminum in medium potassium in medium uranium, deep water weak reduction phase of biological silicon in calcium in medium potassium in medium uranium, deep water weak reduction phase of biological silicon in deep water weak reduction phase of biological silicon in high calcium in medium potassium in medium uranium, deep water in deep water weak reduction phase of biological silicon in deep water, The deep water strong reduction phase of the biological silicon in the extra-high uranium, low potassium, medium calcium and low aluminum, and the deep water strong reduction phase of the biological silicon in the extra-high uranium, low potassium, medium calcium and low aluminum.
The invention further provides an evaluation method of the shale element phase.
The evaluation method may include: and dividing each layer segment from the quincunx group to the roman group according to the element phase division method.
Analyzing reservoir parameters of each interval, and selecting favorable reservoirs through evaluation of the reservoir parameters; the corresponding element phase of the favorable reservoir is the favorable element phase. Wherein favorable reservoirs can be screened by existing reservoir evaluation criteria.
One single well of a block is divided into element phases, and the divided element phases are shown in fig. 7, 8, 9, 10, 11 and 12. The elemental phases and reservoir parameters of each interval can be seen visually from fig. 7-12. Wherein, fig. 7 to 12 show the element phases in different intervals (or different well depths) of the same single well, and the drawings shown in fig. 7 to 12 can be connected with each other in sequence. The deep water biological silicon deep water low-calcium low-aluminum low-biological silicon low-calcium medium-potassium low-calcium medium-calcium low-biological silicon low-calcium phase is arranged between E1 and E2, the deep water silicon low-calcium medium-calcium low-biological silicon oxidation phase is arranged between E3 and E4, the deep water low-calcium medium-calcium low-biological silicon low-calcium phase is arranged between E4 and E5, the deep water low-calcium low-biological silicon low-calcium medium-calcium low-biological silicon low-calcium phase is arranged between E5 and E6, the deep water low-calcium medium-calcium low-biological silicon low-calcium low-biological silicon low-calcium phase is arranged between E6 and E7, the deep water low-calcium medium-calcium low biological silicon deep water low-calcium low biological silicon low-calcium phase is arranged between E7 and E9, the deep water low-calcium medium-calcium low biological silicon high biological silicon low-calcium medium-calcium low-calcium medium.
Table 2 shows the information of the elemental phase and the corresponding reservoir parameter for a certain zone. As can be seen from Table 2, the ultra-high uranium, low potassium, low calcium, low aluminum and high biological silicon deep water strongly reduced phase has high TOC (5.7%), high porosity (7.2%), high gas content (6.1 m)3T), highly brittle minerals (71.7%), whose reservoir is one type, being the most favorable elemental phase.
TABLE 2 statistics of elemental facies shale reservoir parameters in a region
In summary, the method for dividing the shale section element phase from the quincuncial group to the romanxi group and the method for evaluating the shale element phase of the invention have the following advantages:
(1) the method utilizes the element logging information in the drilling process, can simply and quickly judge the distribution condition of the favorable reservoir stratum, and realizes the quick identification of the shale gas high-quality reservoir stratum.
(2) The element phase is beneficial to the fine description of shale deposition characteristics, the accurate understanding of shale gas enrichment rules and high-yield main control geological factors, and has urgent theoretical guiding significance for increasing the yield of shale gas.
(3) The method can be used for rapidly combining element logging data and logging data to calculate the content of the biological silicon, rapidly evaluating the mineral component characteristics of the shale reservoir and enriching the fine evaluation of the reservoir.
(4) According to the invention, through the division of the element phase, the shale gas reservoir can be rapidly evaluated, and the method can play an instructive role in exploration and development work such as sedimentary paleography recovery, favorable zone optimization, reservoir fracturing modification and the like.
Although the present invention has been described above in connection with exemplary embodiments, it will be apparent to those skilled in the art that various modifications and changes may be made to the exemplary embodiments of the present invention without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A method for dividing shale section element phases from a Wufeng group to a Longmaxi group is characterized by comprising the following steps:
screening out characteristic elements from shale stratum data in the same block;
establishing a division standard of element phases according to the relation between the characteristic elements and the deposition environment;
and according to the division standard of element phases, carrying out element phase division on each layer section from the quincunx group to the Longmaxi group.
2. The method of claim 1, wherein the data comprises: at least one of logging data, and formation cuttings analysis data, wherein the logging data includes drilled shale core and formation cuttings mineral analysis data.
3. The method of claim 1, wherein the characteristic elements comprise: at least one of Si, U, K, Ca, Th and Al.
4. The method of claim 3, wherein in the case that the characteristic element includes U, the step of establishing the division criteria of the element phase comprises: dividing the content range of the U element into at least 2 first secondary ranges according to the numerical distribution condition of the TOC and based on the corresponding relation between the U element and the TOC; defining at least 2 uranium phases, wherein the number of the uranium phases is the same as that of the first secondary range, and the uranium phases can correspond to the first secondary range one by one;
in the case where the characteristic element includes Ca, the step of establishing a division criterion of the element phase includes: dividing the content range of Ca element into at least 2 second secondary ranges according to the brittleness of carbonate minerals; defining at least 2 calcium phases, wherein the calcium phases have the same number as the second secondary range and can be in one-to-one correspondence;
in the case where the characteristic element includes Al, the step of establishing the division criterion of the element phase includes: dividing the content range of the Al element into at least 2 third-level ranges according to the brittleness of the carbonate minerals; at least 2 aluminum phases are defined, the number of aluminum phases being the same as the number of third order ranges and being able to correspond one to one.
5. The method of claim 4, wherein in the case where the characteristic element comprises potassium, the step of establishing a partition criterion for the elemental phases comprises: dividing the content range of the potassium element into at least 2 fourth-level ranges according to the corresponding relation between the sedimentary micro-phase and the content of the potassium element; at least 2 potassium phases are defined, the number of potassium phases being the same as the number of fourth order ranges and being able to correspond one to one.
6. The method of claim 3, wherein in the case where the characteristic elements include both U and Th, the method further comprises, before the step of establishing the criteria for partitioning the elemental phases, the steps of: calculating U/Th, wherein the U/Th is the ratio of the contents of the U element and the Th element;
the step of establishing a division criterion of the element phases comprises: dividing the range of U/Th into at least 2 fifth-level ranges according to the distribution condition of the ancient ocean redox environment and based on the corresponding relation between the U/Th and the ancient ocean redox environment; at least 2 redox phases are defined, the redox phases being equal in number to and capable of one-to-one correspondence with the fifth order ranges.
7. The method of claim 3, wherein in the case where the characteristic elements include both Si and Al, the method further comprises, prior to the step of establishing a division criterion for the elemental phases, the steps of: b is obtained by calculation according to formula 1 and formula 2Si，BSiIs the content index of the biological silicon element,
formula 1 is: b isSi＝CSi-Rbg×CAl，
The formula 2 is:
wherein, CSiIs the Si content of the Wufeng group and the Longmaxi group, CAlAl content of the quintet group and the Longmaxi group, Q is a weighting coefficient after well logging data correction, RbgIs the weighted average value of the content ratios of Si and Al elements in the non-reservoir section of the Longmaxi group, i is the logging well depth from the quincunx group to the Longmaxi group, and Q isiThe weighting coefficients after the logging data corresponding to different logging well depths are corrected;
the step of establishing a division criterion of the element phases comprises: according to the deposition phase and BSiCorresponding relation of BSiThe numerical range is divided into at least 2 sixth-order ranges; at least 2 silicon phases are defined, the number of silicon phases being the same as the sixth secondary range and being able to correspond one to one.
8. According to claim7, the method for dividing shale section element phases from the quincunx group to the romanxi group is characterized in that the number of the sixth-order ranges is 4, and the sixth-order ranges are respectively as follows: b isSi＜1％，1％≤BSi＜3％，3％≤BSi≤12％，BSi％＞12；
The number of the silicon phases is also 4, which are respectively as follows: a terrestrial silicon phase, a low-biological silicon phase, a medium-biological silicon phase and a high-biological silicon phase;
wherein, BSiLess than 1 percent of the silicon phase corresponds to the land source silicon phase, and B is more than or equal to 1 percentSiLess than 3 percent of the phase corresponds to low biological silicon phase, and the content of B is more than or equal to 3 percentSiLess than or equal to 12 percent of corresponding biological silicon phase, BSi> 12% corresponds to a high bio-silicon phase.
9. An evaluation method of shale element phases, characterized by comprising the steps of:
dividing element phases and evaluating reservoir parameters of all the sections from the quincunx group to the Longmaxi group;
according to the evaluation of the reservoir parameters, the evaluation of the divided element phases is further realized;
wherein the division of the elemental phases is performed according to the method of the division of the pentapeak group to the romanxi group shale section elemental phases as claimed in any one of claims 1 to 8.
10. The method of evaluating shale elemental phases of claim 9, wherein the reservoir parameters comprise: at least one of TOC, porosity, gas content, and high friable mineral content.
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