CN105201492B - The method of the huge high seam inside deposition discontinuity surface of comprehensive identification - Google Patents
The method of the huge high seam inside deposition discontinuity surface of comprehensive identification Download PDFInfo
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Abstract
The invention discloses the method for the huge high seam inside deposition of a kind of comprehensive identification discontinuity surface, adopt lithotype and coal quality analysis, trace element analysis, organic stable carbon isotope analysis, log data One Dimension Continuous Wavelet Transform, 5 parameters of log data Milankovitch Cyclic Analysis, comprehensively identify the sedimentary discontinuity of huge high seam inside; By the identification of the inner Milankovitch cycle of huge high seam, explained in essence the governing factor of sedimentary break surface development from the origin cause of formation, find " source " of sedimentary break surface development, greatly improve accuracy and the confidence level of sedimentary discontinuity; Meanwhile, the present invention carries out weight according to the sensitiveness of different recognition methods and composes point, and the sedimentary discontinuity identifying is carried out to corresponding assignment, and accumulative total draws the PTS of the whole bag of tricks, the description of quantification the reliability of each sedimentary discontinuity. This recognition methods is convenient, flexible, has good practicality.
Description
Technical field
The present invention relates to the aspects such as a kind of a set of lithotype and coal quality feature, trace element analysis, log data processing comprehensively knowsThe method of not huge high seam inside deposition discontinuity surface, the identification that is especially suitable for original place and piles up huge high seam inside deposition discontinuity surface.
Background technology
In coal seam thickness classification, the coal seam that thickness in monolayer is greater than 8m be called " huge high seam " (poplar rises, Han Dexin,1979). In world wide, find the coal seam that much thickness is huge, such as middle state-two connects single coal seam thickness of basin Shengli Coalfield244.7m, the single coal seam thickness 200m in Cole goldfield, the neat good guest of Soviet Union coalfield etc. As everyone knows, the evolution from peat to coal seamIn journey, be the process of continuous compacting and raw hydrocarbon, material constantly reduces, compacting, shows as thickness and constantly reduces, and compression factor is aboutFor 11:1 (Thomas, 1980). Accordingly, form the huge high seam that thickness in monolayer is greater than 8m, the individual layer peat thickness needing at leastFor 88m; So, form the coal seam of thickness in monolayer 244.7m, need individual layer peat thickness 2691.7m. At present, the thickest in the worldThe about 20m of individual layer peat thickness (Bruenig, 1990), this thickness is far from enough to form the coal seam that thickness is huge, this is alsoTo the huge challenge of " by ancient the present opinion " geology thought. Therefore, the origin mechanism of huge high seam is coal geology for a long time alwaysFocus and the difficult point of research.
Jarrettetal. (2011) are thought, for a long time people's mistake of origin cause of formation ubiquity to huge high seamSeparate, think " huge high seam is formed by a peat paleo-bog body, and be continuous, etc. time peat accumulation record. " realOn border, in huge high seam, there are many dissimilar discontinuity surfaces (hiatalsurfaces), can according to lithotype and coal quality featureIdentify and expose discontinuity surface (" exposure " hiatalsurface) and flood discontinuity surface (" drowing " hiatalSurface) (Jerrettetal., 2011), or mark off non-organic interval (inorganicparting), oxidationInterval (oxidizedparting) and degraded-non-oxide organic interval (degradativenon-oxidizedorganicParting) (Sheareretal., 1994); Visible, the formation of huge high seam is to be formed by stacking by multiple coal seams and discontinuity surfaceComplex, the too much phase peat paleo-bog of growth being once interrupted in areal, multiple ancient peat bodies are mutually stacked, andEnd form becomes huge high seam (Sheareretal., 1994; Jerrettetal., 2011).
The existence of sedimentary discontinuity in huge high seam, make we recognize huge high seam be by multiple peat paleo-bog bodies andThe complex of discontinuity surface composition, each peat paleo-bog body represents the peat paleo-bog of first phase successive sedimentation; Between peat paleo-bogEvolution formed dissimilar sedimentary discontinuity. These understanding have well been explained the forming process of huge high seam, sideHelp us to grow with the geology thought explanation peat bog modern and ancient times of " by ancient the present opinion ", also explained individual layer peat nowThickness is far from enough to form the contradiction of huge high seam.
The method of the huge high seam inside deposition of existing identification discontinuity surface, mainly relies on field intensive sampling and a large amount of sampleQuantitative lithotype and coal quality test analysis,, exposing discontinuity surface/oxidation interval place, shows as inertinite, chitin group and mineral matterVolumn concentration is higher, mirror is lazy smaller; Flooding discontinuity surface/degraded-non-oxide organic interval, vitrinite's volume percentage containsMeasure highlyer, inertinite, chitin group and mineral matter volumn concentration are lower, mirror is lazy larger.
At present, very weak to the research of huge high seam internal discontinuity face in world wide, only there are two scholars to deliver opinionArticles and opinions were stated research (Sheareretal., 1994 of this aspect; Jerrettetal., 2011), and all rely on intensiveCoal seam sampling and quantitative lithotype and coal quality test data are identified qualitatively.
Its reliability of the result that single method identifies is worth discussion, and need to rely on field intensive sampling and a large amount of realTest examination, sampling condition harshness, testing cost are high, have all Multiple Constraints.
In addition, in world wide, do not have further achievement in research to announce at present.
Summary of the invention
The object of the invention is for overcoming above-mentioned the deficiencies in the prior art, the huge high seam of a set of comprehensive identification inside is providedThe method of sedimentary discontinuity; The method comprehensively adopts lithotype and coal quality analysis, trace element analysis, carbon isotope analysis, one dimension to connectFive parameters are identified in continuous wavelet transformation, Milankovitch cycle, comprehensively identify the sedimentary discontinuity of huge high seam inside, identification knotFruit reliability is high, and can its reliability of quantitative description; In the time that some Parameter Conditions is difficult to possess, can rely on other parameter to enterRow identification, recognition methods is convenient, flexible, has good practicality.
For achieving the above object, the present invention adopts following technical proposals:
A method for the huge high seam inside deposition of comprehensive identification discontinuity surface, comprises the following steps:
A. data is prepared
1) huge high seam is according to determining deviation system intensive sampling from bottom to top, and each sample carries out respectively lithotype and coal quality surveyExamination, trace element test and the test of organic stable carbon isotope;
2) log data of the huge high seam layer of systematic collection position;
B. sedimentary discontinuity identification
1) according to lithotype and coal quality test, trace element test and the organic stable carbon isotope test data of sample, divideBetween not depositing by lithotype and coal quality component diagnostic method, feature trace element diagnostic method, organic stable carbon isotope diagnostic methodProfile recognition, and draw recognition result;
(2) huge high seam compensated neutron log data One Dimension Continuous Wavelet Transform diagnostic method is analyzed to identification sedimentary breakFace, draws analysis result;
(3) the gamma ray log data of huge high seam are carried out to the analysis of Milankovitch cycle diagnostic method: if can notIdentify Milankovitch cycle, do not use the method; If can identify Milankovitch cycle, calculate respectively huge thickThickness and the number of the coal deposit cycle of the precession of the equinoxes that comprises in coal seam, slope, eccentricity control;
C. recognition result processing
1) can not identify the situation of Milankovitch cycle
By lithotype and coal quality component diagnostic method, feature trace element diagnostic method, organic stable carbon isotope diagnostic method, well loggingThe sedimentary discontinuity result of data One Dimension Continuous Wavelet Transform diagnostic method identification, according to scoring criteria assignment respectively, log dataCarry out Milankovitch cycle diagnostic method assignment and be 0, draw the PTS of each sedimentary discontinuity, and then obtain each sedimentary breakThe degree of reliability of face;
2) can identify the situation of Milankovitch cycle
By lithotype and coal quality component diagnostic method, feature trace element diagnostic method, organic stable carbon isotope diagnostic method, well loggingThe sedimentary discontinuity result of data One Dimension Continuous Wavelet Transform diagnostic method identification, according to scoring criteria assignment respectively;
Calculate the precession of the equinoxes, slope and the eccentricity control that in huge high seam, are subject to Milankovitch cycle coal deposit cycleNumber, with lithotype and coal quality component diagnostic method, feature trace element diagnostic method, organic stable carbon isotope diagnostic method, log dataThe cycle number that the sedimentary discontinuity of One Dimension Continuous Wavelet Transform diagnostic method identification limits is compared;
If the coal deposit cycle number that in huge high seam, the precession of the equinoxes, slope and 3 parameters of eccentricity are grown has one and coal petrographyAture of coal component diagnostic method, feature trace element diagnostic method, organic stable carbon isotope diagnostic method, log data one dimension are continuously littleA certain method recognition result in wave conversion diagnostic method is similar, and the log data of correspondence is carried out Milankovitch cycle with itDiagnostic method assignment is 1, draws the PTS of each sedimentary discontinuity, and then obtains the degree of reliability of each sedimentary discontinuity;
If coal deposit cycle number and lithotype and coal quality group that in huge high seam, the precession of the equinoxes, slope and 3 parameters of eccentricity are grownDivide diagnostic method, feature trace element diagnostic method, organic stable carbon isotope diagnostic method, log data One Dimension Continuous Wavelet TransformThe recognition result of diagnostic method is all dissimilar, and log data is carried out Milankovitch cycle diagnostic method assignment and is 0, and it is each heavy to drawAmass the PTS of discontinuity surface, and then obtain the degree of reliability of each sedimentary discontinuity.
In described steps A 1) a determining deviation be: in the time that coal seam thickness is less than or equal to 50 meters, spacing is 0.2-0.5m, whenCoal seam thickness exceedes 50m, and sampling interval expands 1m to; If can identify Milankovitch cycle before sampling, ensure the precession of the equinoxesIn the coal deposit cycle thickness of controlling, hits is no less than 3.
The concrete recognition methods of described lithotype and coal quality component diagnostic method is: water enters type discontinuity surface and shows as " two high one low ", waterThe type discontinuity surface of moving back shows as " two Senior Three are low "; Because the differences such as different regions coal-forming geological environment, coal-forming material type are all larger,Be difficult to determine the standard value of absolute " height " and " low ", can only determine approximate range, be i.e. " two high one low " Zhi Gao vitriniteVolumn concentration>50%, the lazy ratio of high mirror>1, low inertinite volumn concentration<50%; " one high two low " refers to high inertinite bodyLong-pending percentage composition>50%, lazy ratio<1 of low mirror, low vitrinite volumn concentration<50%; Inorganic mineral components volumn concentrationThere is no inevitable corresponding relation with discontinuity surface type, but often show as relative high value or low value at discontinuity surface place, be subject to coal-formingThe impact of phase detrital material supply, its volumn concentration height does not have specific standards value, but with the test of its top, bottomThe height that some data are carried out qualitative comparison is defined as high value or low value.
Described mirror is lazy than the ratio size of Shi Meizhong vitrinite/inertinite volumn concentration.
The concrete recognition methods of described feature trace element diagnostic method is: water enters type discontinuity surface and shows as " three is low ", and water moves back typeDiscontinuity surface shows as " three height ". " three height " refers to high-micro-element Rb/Sr ratio, high-micro-element Th/U ratio, high-micro-elementSr/Ba ratio; " three is low " refers to low micro-Rb/Sr ratio, low micro-Th/U ratio, low micro-Sr/Ba ratio.Because trace element in coal self content is very micro-, and quality percentage composition changes greatly in different coal classes, is difficult to unified consumptionChange standard value and carry out quantitative description, said " height " is the test point numerical value phase with respect to its top, bottom with " low " hereRelative.
The concrete recognition methods of described organic stable carbon isotope diagnostic method is: water enters type discontinuity surface and shows as organic steadyDetermine carbon isotope δ13C value lightens, and numerical value diminishes; Water moves back type discontinuity surface and shows as organic stable carbon isotope δ13C value becomesHeavy, numerical value becomes large.
The concrete recognition methods of described log data One Dimension Continuous Wavelet Transform diagnostic method is: to the compensated neutron of huge high seamLog data is carried out One Dimension Continuous Wavelet Transform analysis, parameters a=32, f=0.025, local maximum line (localMaximalines) position of entering type discontinuity surface with water fits like a glove.
The concrete recognition methods of described log data Milankovitch cycle diagnostic method is: utilize huge high seam natural gamma to surveyThe Milankovitch cycle of containing in well data identification coal seam, calculates respectively the precession of the equinoxes, slope and the eccentricity control that in producing coal, compriseCycle length and the number of system, so with lithotype and coal quality component diagnostic method, feature trace element diagnostic method, organic Stable Carbon withCheck analysis is carried out at the interface of the plain diagnostic method in position, the identification of log data One Dimension Continuous Wavelet Transform diagnostic method, increases interface identificationReliability.
Described scoring criteria is:
Forefathers' recognition methods is comparatively single, is only a kind of recognition methods of this method system, and fails from right in essenceRecognition result makes an explanation, the poor reliability of recognition result; The present invention is inheriting on the basis of forefathers' recognition methods, is increasingThe sides such as trace element test analysis, organic stable carbon isotope test analysis and the analysis of many means log data information excavatingMethod, adopts multi-method, multi-angle to carry out comprehensive identification and existence and the reliability thereof of judging huge high seam inside deposition discontinuity surface,And identify the governing factor of having explained sedimentary break surface development from the origin cause of formation by Milankovitch cycle, find between deposition" source " of section, has improved recognition result accuracy and confidence level greatly; Meanwhile, quick according to different recognition methods of the present inventionPerception is carried out weight assignment, and the sedimentary discontinuity identifying is carried out to corresponding assignment, and accumulative total draw the whole bag of tricks mustPoint, the description of quantification the reliability of each sedimentary discontinuity.
The present invention comprehensively adopts lithotype and coal quality diagnostic method, feature trace element diagnostic method, organic stable carbon isotope to sentenceOther method, log data One Dimension Continuous Wavelet Transform diagnostic method, log data Milankovitch cycle diagnostic method, comprehensively identified hugeThe sedimentary discontinuity of high seam inside, recognition result accuracy is high, reliability is strong; And in the time that some Parameter Conditions does not possess, canTo rely on other parameter to identify, recognition methods is convenient, flexible, has good practicality.
Brief description of the drawings
Fig. 1 is huge high seam inside deposition discontinuity surface type and grows schematic diagram;
Fig. 2 is huge high seam lithotype and coal quality component diagnostic method and sedimentary discontinuity figure;
Fig. 3 is huge high seam trace element, Carbon Isotope Characteristics and sedimentary discontinuity figure;
Fig. 4 is the continuous one-dimensional wavelet transform diagnostic method of huge high seam compensated neutron log and sedimentary discontinuity figure;
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention is further described.
Preferred forms of the present invention, can carry out according to following 3 key steps:
A. data is prepared
1) huge high seam according to a determining deviation from bottom to top system intensive sampling (in the time that coal seam thickness is less than or equal to 50 meters,Spacing is 0.2-0.5m, and when coal seam thickness exceedes 50m, sampling interval expands 1m to; If can identify Milan section dimension before samplingStrange cycle, ensures that the interior hits of coal deposit cycle thickness of precession of the equinoxes control is no less than 3), each sample carries out respectively coal petrography coalMatter test, trace element test and the test of organic stable carbon isotope;
2) log data of the huge high seam layer of systematic collection position;
B. sedimentary discontinuity identification
1) according to lithotype and coal quality test, trace element test and the organic stable carbon isotope test data of sample, divideDo not use lithotype and coal quality component diagnostic method, feature trace element diagnostic method, organic stable carbon isotope diagnostic method, log data oneDimension continuous wavelet transform diagnostic method is carried out sedimentary discontinuity identification, and draws recognition result;
2) huge high seam compensated neutron log data One Dimension Continuous Wavelet Transform is analyzed, identification sedimentary discontinuity, drawsAnalysis result;
3) the gamma ray log data of huge high seam are carried out to the analysis of Milankovitch cycle diagnostic method, if can not knowDo not go out Milankovitch cycle, do not use the method; If can identify Milankovitch cycle, calculate respectively huge thick coalThickness and the number of the precession of the equinoxes, the slope comprising in layer, the coal deposit cycle of eccentricity control;
C. recognition result processing
1) can not identify the situation of Milankovitch cycle
By lithotype and coal quality component diagnostic method, feature trace element diagnostic method, organic stable carbon isotope diagnostic method, well loggingThe sedimentary discontinuity result of data One Dimension Continuous Wavelet Transform diagnostic method identification, according to scoring criteria assignment respectively, log dataCarry out Milankovitch cycle diagnostic method assignment and be 0, draw the PTS of each sedimentary discontinuity, and then obtain each sedimentary breakThe degree of reliability of face;
2) can identify the situation of Milankovitch cycle
By lithotype and coal quality component diagnostic method, feature trace element diagnostic method, organic stable carbon isotope diagnostic method, well loggingThe sedimentary discontinuity result of data One Dimension Continuous Wavelet Transform diagnostic method identification, according to scoring criteria assignment respectively;
Calculate the precession of the equinoxes, slope and the eccentricity control that in huge high seam, are subject to Milankovitch cycle coal deposit cycleNumber, with lithotype and coal quality component diagnostic method, feature trace element diagnostic method, organic stable carbon isotope diagnostic method, log dataThe cycle number that the sedimentary discontinuity of One Dimension Continuous Wavelet Transform diagnostic method identification limits is compared;
If the coal deposit cycle number that in huge high seam, the precession of the equinoxes, slope and 3 parameters of eccentricity are grown has one and coal petrographyAture of coal component diagnostic method, feature trace element diagnostic method, organic stable carbon isotope diagnostic method, log data one dimension are continuously littleA certain method recognition result in wave conversion diagnostic method is similar, and the log data of correspondence is carried out Milankovitch cycle with itDiagnostic method assignment is 1, draws the PTS of each sedimentary discontinuity, and then obtains the degree of reliability of each sedimentary discontinuity;
If coal deposit cycle number and lithotype and coal quality group that in huge high seam, the precession of the equinoxes, slope and 3 parameters of eccentricity are grownDivide diagnostic method, feature trace element diagnostic method, organic stable carbon isotope diagnostic method, log data One Dimension Continuous Wavelet TransformThe recognition result of diagnostic method is all dissimilar, and log data is carried out Milankovitch cycle diagnostic method assignment and is 0, and it is each heavy to drawAmass the PTS of discontinuity surface, and then obtain the degree of reliability of each sedimentary discontinuity.
Scoring criteria is:
The present invention includes 3 major parts, one is the division of sedimentary discontinuity type, the 2nd, and the identification of sedimentary discontinuity,The 3rd, sedimentary discontinuity reliability evaluation.
One, sedimentary discontinuity type is divided
On the basis of forefathers' research, in conjunction with the feasibility that sedimentary discontinuity is identified, the present invention has divided two kinds typicallySedimentary discontinuity:
(1) water enters type discontinuity surface
In Peat Accumulation process, water level rises gradually, water body is deepened, and causes Peat Accumulation to occur undercompensation, and water body is deepenedMake comparatively humidity and deflection reducing environment of forming Environment, water level reduces gradually afterwards, and Peat Accumulation changes balanced benefit gradually intoRepay even overcompensation, in this transitional period, peat may be piled up continuously, and to lake, (sea) direction may be by lacustrine facies (marine facies) mud stoneDeposition replaces, and this turnover face is called " water enters type discontinuity surface " (water-transgressivehiatalsurface). (asShown in Fig. 1)
(2) water moves back type discontinuity surface
In Peat Accumulation process, water level declines gradually, water body shoals, and causes Peat Accumulation to occur overcompensation, and water body becomesThe shallow forming Environment that makes is comparatively dried and is partial to oxidation environment, and even part peat exposes oxidation; Afterwards, water level raises gradually,Peat Accumulation gradually transition is even undercompensation of isostatic compensation, and in this transitional period, peat may be piled up continuously, onshore directionAlso may be because exposure stops piling up, this turnover face is called " water moves back type discontinuity surface " (water-regressionhiatalSurface). (as shown in Figure 1)
Fig. 1 is huge high seam inside deposition discontinuity surface type and growth schematic diagram, and figure Oxford gray is coal seam, and light gray isNon-coal deposit thing; In figure, can see, left side water body is relatively shallow, and coal seam thickness is large, and (coal seam is mainly grown at water body more shallowPeat moor environment); Water body is deepened to the right, and coal seam is bifurcated, attenuation gradually, and pinching disappears gradually. That is to say huge thick coalThe distribution of layer is limited, bifurcated, pinching gradually to the periphery. Coal seam stretch out and bifurcated be to be drawn by the depth of water bodyRise, with regard to coal-forming marsh, show as the depth of water body, the variation of dry wet, redox environment. In figure, water enters discontinuity surface tableShow the water body large face that rises most, cause forming Environment water shallow place migration to the left, right side is covered darker area, growth by water bodyNon-coal deposit, although coal seam, left side deposition, but all have relevant embodiment, Ke Yishi at the aspect such as lithotype and coal quality, geochemistryNot out. In figure, water moves back discontinuity surface and represents water body decline largest face, may cruelly spill near coal seam, the shallow place of water, left side, and oxygen occursChange and decompose; Although and do not come out in right side, coal seam, all have embodiment at the aspect such as lithotype and coal quality, geochemistry, can identifyOut. The above-mentioned sedimentary discontinuity of comprehensive identification, is main contents of the present invention.
Two, sedimentary discontinuity recognition methods
(1) lithotype and coal quality component diagnostic method
Theoretical foundation: the maceral kind of coal and content are the basic sign of the reflection coal origin cause of formation. It is generally acknowledged vitriniteBe by the root of plant, stem, leaf covering under the condition of water reduction, form through gelling; Inertinite is to be existed by plant remainsUnder drier oxidizing condition, form through fusainization. If that peat bog is water level is high, cover water and moist micro-ringBorder, peat process is taking gelling as main, and after the peat of formation changes coal-forming, vitrinite is just high; If otherwise peat bog waterPosition is low, and dry microenvironment is in the majority, and peat process is taking fusainization as main, and after the peat of formation changes coal-forming, inertinite justHigh. Therefore, in coal, mirror is lazy than (V/I) size, has reflected the total of oxidation-reduction environment in the overall or certain limit of peat bogDignity looks, and then can judge peat bog humidity-dry degree, V/I also can be described as moist coefficient.
Recognition methods: water enters type discontinuity surface and shows as " two high one low ", and it is on the contrary that water moves back type discontinuity surface, shows as" two Senior Three are low ". " two high one low " Zhi Gao vitrinite volumn concentration, high mirror are lazy than (V/I), and low inertinite volume percentage containsAmount; " one high two low " refers to high inertinite volumn concentration, and low vitrinite volumn concentration, low mirror are lazy than (V/I). Inorganic ore depositThing component volumn concentration and discontinuity surface type do not have inevitable corresponding relation, but often show as relative at discontinuity surface placeHigh value or low value.
Instance analysis: taking the huge high seam in BC area as example, can identify 4 water and enter type sedimentary discontinuity, numbering successivelyFor T1, T2, T3, T4 and 3 water move back type discontinuity surface, numbering is followed successively by R1, R2, R3, shows as 3 enter-water of water from bottom to top and moves backCycle and half water enter cycle (seeing Fig. 2). Fig. 2 is huge high seam lithotype and coal quality component diagnostic method and sedimentary discontinuity schematic diagram,The darker reducing environment of the higher reflection water body of Tu Zhong vitrinite percentage composition, inertinite percentage composition is higher reflects that water body is more shallowOxidation environment, the lazy ratio of mirror is higher, has reflected that the more inertinites of vitrinite are fewer, reflects the dark and oxidation environment of water body.Be that water enters type discontinuity surface and shows as high vitrinite volumn concentration, the lazy ratio of high mirror, low inertinite volumn concentration; Water moves back typeDiscontinuity surface is just the opposite; Often there is extreme value in inorganic component volumn concentration, play aid illustration and do near discontinuity surfaceWith.
(2) feature trace element diagnostic method
Theoretical foundation: responsive geologic climate trace element parameter rubidium/strontium ratio (Rb/Sr), thorium/uranium ratio (Th/U), strontium/bariumRatio (Sr/Ba) can be used as and have a humid climate-good index of arid and oxidation-reducing condition, and the reduction of warmer climate humidityCondition (water body is darker) Rb/Sr, Th/U, Sr/Ba ratio are relatively low, the oxidizing condition (water body is more shallow) of hot climate aridRb/Sr, Th/U, Sr/Ba ratio are relatively high.
Recognition methods: water enters type discontinuity surface and shows as " three is low ", it is on the contrary that water moves back type discontinuity surface, shows as " threeHigh ". " three height " refers to high Rb/Sr ratio, high Th/U ratio, high Sr/Ba ratio; " three is low " refers to low Rb/Sr ratio, low Th/U ratioValue, low Sr/Ba ratio.
Instance analysis: taking the huge high seam in BC area as example, can identify 3 water and enter type sedimentary discontinuity, numbering successivelyFor T1, T2, T3 and 3 water move back type discontinuity surface, numbering is followed successively by R1, R2, R3, roughly shows as 3 enter-water of water from bottom to top and moves backCycle. (seeing Fig. 3)
(3) organic stable carbon isotope diagnostic method
Theoretical foundation: organic carbon isotope δ in coal seam13Temperature and humidity condition when C value can represent peat deposition,Along with temperature raises, it is dry that weather becomes, and peat moor environment oxidisability strengthens, δ13It is heavy that C becomes; In the time that atmospheric humidity is lower, gasCO in hole degree of leading and cell2Concentration is low, thereby causes plant cellulose δ13C value increases, and then causes δ in coal13It is heavy that C becomes.
Recognition methods: water enters type discontinuity surface and shows as δ13C value lightens (value diminishes), and it is on the contrary that water moves back type discontinuity surface,Show as δ13C value becomes heavy (it is large that value becomes).
Instance analysis: taking the huge high seam in BC area as example, can identify 4 water and enter type sedimentary discontinuity, numbering successivelyFor T1, T2, T3, T4 and 3 water move back type discontinuity surface, numbering is followed successively by R1, R2, R3, and roughly showing as 3 water from bottom to top enters-The water derotation is returned. Fig. 3 is huge high seam trace element, Carbon Isotope Characteristics and sedimentary discontinuity schematic diagram, responsive geologic climate in figureTrace element parameter rubidium/strontium ratio (Rb/Sr), thorium/uranium ratio (Th/U), strontium/barium ratio (Sr/Ba) can be used as weather tideThe good index of wet-arid and oxidation-reducing condition, the water body depth or advance and retreat have been reflected in side. Feature trace element ratio Rb/Sr, Th/U, Sr/Ba are relatively low, instruction warmer climate humidity compared with deep water reducing condition, represent that water moves back type discontinuity surface; FeatureTrace element ratio Rb/Sr, Th/U, Sr/Ba are relatively high, and the shallow water oxidizing condition of instruction hot climate arid, represents that water moves backType discontinuity surface.
(4) log data One Dimension Continuous Wavelet Transform diagnostic method
Theoretical foundation: wavelet transformation is the partial transformation of the frequency in space (time), can effectively extract from signalInformation, by the flexible peaceful calculation function that moves, can carry out multiple dimensioned explication de texte to function or signal, and then solves Fourier's changeChange indeterminable a lot of problem. By to log data One Dimension Continuous Wavelet Transform, can characterize " similar " of two dataDegree, and then data volume is divided into the part of several " similar ". Huge high seam forms phase, the composition of the advance and retreat degree of water body to coalAffect greatlyr, some are by certain analysis, as continuous in one dimension to having left corresponding record in this responsive log dataWavelet transformation, can be by these information revertings out.
Recognition methods: the compensated neutron log data to huge high seam are carried out One Dimension Continuous Wavelet Transform analysis, and ginseng is setNumber a=32, f=0.025, local maximum line (localmaximalines) is kissed completely with the position that water enters type discontinuity surfaceClose.
Instance analysis: taking the huge high seam in BC area as example, can identify 4 water and enter type sedimentary discontinuity, numbering successivelyFor T1, T2, T3, T4 (seeing Fig. 4). Fig. 4 is between the continuous one-dimensional wavelet transform diagnostic method of huge high seam compensated neutron log and depositionSectional schematic diagram, carries out continuous one-dimensional wavelet transform by the compensated neutron log data to huge high seam, parameters a=32, f=0.025, puies forward log data the piece section that is divided into 4 " similar ", its line of demarcation just and water enter type discontinuity surface pairShould be good.
(5) log data Milankovitch cycle diagnostic method
Theoretical foundation: conventionally grow and change relatively stable period at Basin Tectonic containing coal seam, its change to depositional environment,Especially the variation of weather is both responsive, easily preserves again deposition information. In numerous deposition information, stratigraphic cyclesBe one of information important, easily identification, it is little of several centimetres, arrives greatly rice up to a hundred. Gamma ray curve changes geologic climateHaving good record, is that reflection inland dry basin Climate and environment changes good substituted index. The present invention utilizes nature galThe huge high seam of horse curve carries out the spectrum analysis of FFT method, therefrom extracts its Milankovitch cycle geological information;If can not identify Milankovitch cycle, do not use the method; If can identify Milankovitch cycle, meter respectivelyCalculate thickness and the number of the cycle of sedimentation of the precession of the equinoxes that comprises in huge high seam, slope, eccentricity control, checking lithotype and coal quality componentDiagnostic method, feature trace element diagnostic method, organic stable carbon isotope diagnostic method, the identification of One Dimension Continuous Wavelet Transform diagnostic methodThe result of the sedimentary discontinuity going out.
Recognition methods: utilize the Milankovitch cycle of containing in huge high seam gamma ray log data identification coal seam,Analyze coal seam the cycle length and the cycle number that comprise, so with lithotype and coal quality component diagnostic method, feature trace element diagnostic method,Check analysis is carried out at the interface of organic stable carbon isotope diagnostic method, the identification of One Dimension Continuous Wavelet Transform diagnostic method, increases boundaryThe reliability of face identification.
Instance analysis: taking the huge high seam in BC area and coal seam, adjacent area thereof as example, due to Milankovitch cycle be one grandThe Climate Cycles of seeing, interior variation not quite at the regional level, in order to improve accuracy of identification, this is the BC huge high seam in area and neighbour thereofHas got in coal seam 10 intervals and has carried out Milankovitch cycle identification in district, and by each interval precession of the equinoxes, slope and heavy in the eccentricity cycleLong-pending coal seam length is averaged, to reduce accidental error. The coal seam cycle week of precession of the equinoxes control in BC area and coal seam, adjacent area thereofPhase average length is 1.55m, and coal seam average length turning interval of slope control is 3.07m, the coal seam cycle of eccentricity controlCycle average length is 7.32m (table 1). In this exemplary plot 2, Fig. 3, Fig. 4, huge high seam thickness is 11.30m, has identified altogether3.5 cycles, average each turning interval, length was 11.3m ÷ 3.5=3.22m, with the coal seam turning interval of slope controlAverage length is approximate, can think that the growth of sedimentary discontinuity is become by the slope cycle in Milankovitch cycle in this huge high seamThe control of changing. And then from having explained in essence the governing factor of sedimentary break surface development, increase between the deposition of the present invention's identificationThe confidence level of section.
Three, sedimentary discontinuity reliability evaluation
5 kinds of sedimentary discontinuity recognition methods that the present invention relates to are the phases that differs in the status of whole identification system the insideWith, lithotype and coal quality component diagnostic method, feature trace element diagnostic method, organic stable carbon isotope diagnostic method are directly to differentiateMethod, One Dimension Continuous Wavelet Transform diagnostic method is indirect discrimination method, Milankovitch cycle diagnostic method is checking diagnostic method. Coal petrography coalThe parameter that matter component diagnostic method, feature trace element diagnostic method, organic stable carbon isotope diagnostic method are used all with become coal slimeThe humidity in charcoal marsh has direct corresponding relation with arid, Redox Condition etc.; One Dimension Continuous Wavelet Transform diagnostic method is pointAnalysing log data and carry out the division of " similar " data segment, is indirect discrimination method; It is by identification that rule is differentiated in Milankovitch cycleThickness and cycle number that the water water inlet derotation comprising in huge high seam is returned are verified lithotype and coal quality component diagnostic method, feature traceThe result of element diagnostic method, organic stable carbon isotope diagnostic method, the recognition methods of One Dimension Continuous Wavelet Transform diagnostic method kind.
Research finds the sensitivity difference of different method of discrimination to discontinuity surface, in order to describe more accurately discontinuity surfaceReliability, this research has been carried out weight assignment (table 2) to various method of discrimination. For certain sedimentary discontinuity, it is heavy to identifyThe method of long-pending section, counts 1 point, 0 point of the meter of can not identifying, and the score of the whole bag of tricks is sued for peace after being multiplied by weight, and full marks are 100 points,Score is higher, illustrates that the reliability of this sedimentary discontinuity existence is larger. Example case study the results are shown in Table 3.
The huge high seam of table 1 is grown different regions, basin Milankovitch and is identified statistical form turning interval
The weight assignment of all kinds of diagnostic methods of table 2
The huge high seam discontinuity surface of table 3 example is differentiated result table
By reference to the accompanying drawings the specific embodiment of the present invention is described although above-mentioned, not the present invention is protected to modelThe restriction of enclosing, one of ordinary skill in the art should be understood that, on the basis of technical scheme of the present invention, those skilled in the art are notNeed to pay various amendments that creative work can make or distortion still in protection scope of the present invention.
Claims (8)
1. a method for the huge high seam inside deposition discontinuity surface of comprehensive identification, is characterized in that, comprises the following steps:
A. data is prepared
1) huge high seam according to a determining deviation from bottom to top the each sample of system intensive sampling carry out respectively lithotype and coal quality test, traceElement test and the test of organic stable carbon isotope;
2) log data of the huge high seam layer of systematic collection position;
B. sedimentary discontinuity identification
1) according to lithotype and coal quality test, trace element test and the organic stable carbon isotope test data of sample, use respectivelyLithotype and coal quality component diagnostic method, feature trace element diagnostic method, organic stable carbon isotope diagnostic method are carried out sedimentary discontinuityIdentification, and draw recognition result;
2) huge high seam compensated neutron log data are carried out to the analysis of One Dimension Continuous Wavelet Transform diagnostic method, identification sedimentary breakFace, draws analysis result;
3) the gamma ray log data of huge high seam are carried out to the analysis of log data Milankovitch cycle diagnostic method, if notCan identify Milankovitch cycle, not use log data Milankovitch cycle diagnostic method; If can identify MilanKe Weiqi cycle, calculate respectively the precession of the equinoxes that comprises in huge high seam, slope, eccentricity control coal deposit cycle thickness andNumber;
C. recognition result processing
1) can not identify the situation of Milankovitch cycle
By lithotype and coal quality component diagnostic method, feature trace element diagnostic method, organic stable carbon isotope diagnostic method, log dataThe sedimentary discontinuity result of One Dimension Continuous Wavelet Transform diagnostic method identification, according to scoring criteria assignment, wherein log data respectivelyMilankovitch cycle diagnostic method assignment is 0, draw the PTS of each sedimentary discontinuity, and then obtains each sedimentary discontinuityThe degree of reliability;
2) can identify the situation of Milankovitch cycle
By lithotype and coal quality component diagnostic method, feature trace element diagnostic method, organic stable carbon isotope diagnostic method, log dataThe sedimentary discontinuity result of One Dimension Continuous Wavelet Transform diagnostic method identification, according to scoring criteria assignment respectively;
Calculate the number of the coal deposit cycle of the precession of the equinoxes, slope and the eccentricity control that are subject to Milankovitch cycle in huge high seam,With lithotype and coal quality component diagnostic method, feature trace element diagnostic method, organic stable carbon isotope diagnostic method, log data one dimensionThe cycle number that the sedimentary discontinuity of continuous wavelet transform diagnostic method identification limits is compared;
If the periodicity that in huge high seam, the precession of the equinoxes, slope and three parameters of eccentricity are grown has one to sentence with lithotype and coal quality componentOther method, feature trace element diagnostic method, organic stable carbon isotope diagnostic method, log data One Dimension Continuous Wavelet Transform are differentiatedA certain method recognition result in method is similar, and the sedimentary discontinuity log data Milankovitch cycle of correspondence is differentiated with itMethod assignment is 1, draws the PTS of each sedimentary discontinuity, and then obtains the degree of reliability of each sedimentary discontinuity;
If coal deposit cycle number and lithotype and coal quality component that in huge high seam, the precession of the equinoxes, slope and 3 parameters of eccentricity are grown are sentencedOther method, feature trace element diagnostic method, organic stable carbon isotope diagnostic method, log data One Dimension Continuous Wavelet Transform are differentiatedThe recognition result of method is all dissimilar, and log data is carried out Milankovitch cycle diagnostic method assignment and is 0, draws between each depositionThe PTS of section, and then obtain the degree of reliability of each sedimentary discontinuity.
2. the method for the huge high seam inside deposition of comprehensive identification as claimed in claim 1 discontinuity surface, is characterized in that described stepIn A 1) a determining deviation be: in the time that coal seam thickness is less than 50 meters, be 0.2-0.5m, when coal seam thickness exceedes 50m, sampling intervalExpand 1m to; If can identify Milankovitch cycle before sampling, ensure to adopt in the coal deposit cycle thickness of precession of the equinoxes controlSample number is no less than 3.
3. the method for the huge high seam inside deposition of comprehensive identification as claimed in claim 1 discontinuity surface, is characterized in that described coal petrographyThe concrete recognition methods of ature of coal component diagnostic method is: water enters type discontinuity surface and shows as two high one lowly, and water moves back phase exactly of type discontinuity surfaceInstead, show as one high two low, two high Di Zhigao vitrinite volumn concentrations > 50%, the lazy ratio of high mirror > 1, low inertinite volumePercentage composition<50%; The high inertinite volumn concentration of one high two low finger>50%, lazy ratio<1 of low mirror, low vitrinite volume percentage containAmount < 50%; Inorganic mineral components volumn concentration and discontinuity surface type do not have inevitable corresponding relation, but show at discontinuity surface placeBe now relative high value or low value, be subject to the how many impact of coalforming period detrital material supply, its volume percentage does not have tool containing value heightBody standard value, but be defined as high value or low value with the number of test points of its top, bottom according to the height of qualitative comparison;
Described mirror is lazy than the volumn concentration ratio size of Shi Meizhong vitrinite and inertinite.
4. the method for the huge high seam inside deposition of comprehensive identification as claimed in claim 1 discontinuity surface, is characterized in that described featureTrace element diagnostic method concrete recognition methods is: water enters type discontinuity surface and shows as three lowly, and water moves back type discontinuity surface and shows as three height; ThreeHeight refers to high-micro-element Rb/Sr ratio, high-micro-element Th/U ratio, high-micro-element Sr/Ba ratio; The low trace of three low fingers unitElement Rb/Sr ratio, low micro-Th/U ratio, low micro-Sr/Ba ratio; Due to trace element in coal self content veryMicro-, and in different coal classes, quality percentage composition changes greatly, is difficult to carry out quantitative description by quantification standard value, and said hereHigh-micro-element in height and low trace element in low be test point numerical value phase with respect to this abnormity point upper and lowerRelative.
5. the method for the huge high seam inside deposition of comprehensive identification as claimed in claim 1 discontinuity surface, is characterized in that, described organicThe concrete recognition methods of matter stable carbon isotope diagnostic method is: water enters type discontinuity surface and shows as organic carbon isotope δ13C value lightens,Numerical value diminishes; Water moves back type discontinuity surface and shows as organic carbon isotope δ13It is heavy that C value becomes, and numerical value becomes large.
6. the method for the huge high seam inside deposition of comprehensive identification as claimed in claim 1 discontinuity surface, is characterized in that described well loggingThe concrete recognition methods of data One Dimension Continuous Wavelet Transform diagnostic method is: the compensated neutron log data to huge high seam are carried out one dimensionContinuous wavelet transform is analyzed, parameters a=32, f=0.025, and local maximum line and water enter the position of type discontinuity surface and kiss completelyClose.
7. the method for the huge high seam inside deposition of comprehensive identification as claimed in claim 1 discontinuity surface, is characterized in that described well loggingThe concrete recognition methods of data Milankovitch cycle diagnostic method is: utilize in huge high seam gamma ray log data identification coal seamThe Milankovitch cycle information containing, calculates the precession of the equinoxes, slope and the eccentricity cycle of Milankovitch cycle in huge high seamIts number of the coal seam thickness of interior deposition and cycle, with lithotype and coal quality component diagnostic method, feature trace element diagnostic method, organic steadyDetermine the interface of carbon isotope diagnostic method, the identification of log data One Dimension Continuous Wavelet Transform diagnostic method and carry out check analysis, increase boundaryThe reliability of face identification.
8. the method for the huge high seam inside deposition of comprehensive identification as claimed in claim 1 discontinuity surface, is characterized in that described assignmentIn standard, the weight of each diagnostic method is respectively:
The weight of lithotype and coal quality component diagnostic method is 40;
In feature trace element diagnostic method, the weight of Rb/Sr, Th/U and Sr/Ba is 5;
The weight of organic stable carbon isotope diagnostic method is 15;
The weight of log data One Dimension Continuous Wavelet Transform diagnostic method is 10;
The weight of log data Milankovitch cycle diagnostic method is 20.
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| CN110529106B (en) * | 2019-07-12 | 2023-04-07 | 中国石油天然气集团有限公司 | Method for determining content of coal seam micro-components by using logging information |
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