CN108956953A - Mud shale series of strata lithofacies division methods and verification method between a kind of salt - Google Patents
Mud shale series of strata lithofacies division methods and verification method between a kind of salt Download PDFInfo
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Abstract
Mud shale series of strata lithofacies division methods and verification method between a kind of salt, belong to shale oil exploration geology field.Mud shale series of strata lithofacies division methods include that the stratification thickness for determining mud shale is identified by core observation to mud shale and optical microscopy between a kind of salt, the rock forming mineral type of mud shale is determined using total rock ensaying measurement rock core, the abundance of organic matter of mud shale is determined by being pyrolyzed organic carbon analysis, the rock forming mineral volume content corresponding to rock forming mineral type for determining mud shale is observed using thin slice under total rock ensaying combination mirror, " four components, three end member " principle classification based on rock type, according to detrital mineral component in mud shale, calcite component, the volume content of dolomite constituents divides the rock type of mud shale.Mud shale series of strata lithofacies divide verification method between a kind of salt, utilize the rock rock electrical feature having the same for the mud shale that natural gamma spectra, Logging Curves signature verification are divided into identical lithofacies.
Description
Technical field
The present invention relates to shale oil exploration geology field, and mud shale series of strata lithofacies division methods between in particular to a kind of salt
And verification method.
Background technique
The oil-gas exploration of unconventional petroleum resources mud shale and exploitation achieve immense success in the U.S., have become the whole world at present
The hot spot direction of research and Exploration Domain.Its color, ingredient, structure, construction, reservoir space are found when to the observation of mud shale series of strata
Feature and oiliness all show extremely strong heterogeneity, and key factor is complicated in its mineralogical composition, Lithofacies Types variation is fast, line
The features such as layer development.Domestic and foreign scholars mainly to mud shale reservoir space type carried out numerous studies and achieve it is plentiful and substantial at
Fruit, but it is relatively fewer to mud shale lithofacies sort research, lack unified classification standard and understanding.
In The Jianghan Salt-lake Basin stratum is mainly biodeposition, mechanical deposit effect, chemical deposition effect (chemical reaction
Precipitating, water body concentrating and precipitating) three kinds of process composite deposition products, deposition process is complicated.Inland brine lake chemical deposition ambient determines
Argillaceous dolomite changes frequently in the longitudinal direction between salt.With the variation of geologic climate and secondary water, the carbonate rock of opposite desalination
Sulfate or halite with relative enhancement can be in millimetre-sized variation in the longitudinal direction, this frequent alternating deposit effect,
The glauberite that coarse grain is constituted in structure frequently replaces shape in thickness with shale grade dolomite or mud stone, is structurally formed fairly obvious
Stratification.In plane, by the control of the factors such as paleotopography, source direction, depositional environment and salinity center, also in regularity
Ground changes, but different from longitudinal frequent variation, generally gradual change relationship.
The three categories mineral such as major developmental carbonate, sulfate, clastic rock in salt rhythm stratum.It is retouched using fine rock core
It states with a large amount of thin slice, cathodoluminescence, the analysis of X diffraction spectroscopy, chemical analysis etc., in conjunction with scanning electron microscope, electron probe and complete
Rock X diffraction, stratum mud shale lamina is extremely developed between microscopic observation salt；In addition to saline minerals is easily identified, terrigenous clastic and carbonic acid
Saline minerals is all micrite grade, it is difficult to be identified；Saline minerals (predominantly glauberite) form of diverse, complex genesis.Total rock X diffraction
Test result shows that the content of the three categories mineral such as clast class mineral, carbonate mineral, saline minerals is no more than 50%, it is difficult to
Name.
Summary of the invention
The purpose of the present invention is to provide mud shale series of strata lithofacies division methods between a kind of salt, provide a kind of draw for mud shale
Divide method.
Another object of the present invention is to provide a kind of verification methods of mud shale series of strata lithofacies between salt, verify identical lithofacies
Mud shale rock feature having the same, so that it is determined that the science of division methods.
The present invention solves its technical problem and adopts the following technical solutions to realize.
The present invention proposes mud shale series of strata lithofacies division methods between a kind of salt comprising:
By the stratification thickness of core observation and the determining mud shale of optical microscopy identification to mud shale, and according to stratification
Whether thickness divides the stratification construction of mud shale more than 10cm, determines the macrostructure type of mud shale；
The rock forming mineral type of mud shale is determined using total rock ensaying measurement rock core；
The abundance of organic matter for determining the organic matter phase of mud shale by being pyrolyzed organic carbon analysis；
The rock corresponding to rock forming mineral type for determining mud shale is observed using thin slice under total rock ensaying combination mirror
Mineral volume content；
" four components, three end member " principle classification based on rock type, according to detrital mineral component, Fang Xie in mud shale
The rock type of the volume content of stone component and dolomite constituents division mud shale, wherein four groups are divided into detrital mineral, Fang Xie
Stone, dolomite and organic matter fraction, three end members are detrital mineral, calcite and dolomite；
The lithofacies of mud shale are divided using the method that rock constituents-stratification construction-organic matter combines, rock constituents include
The corresponding rock forming mineral volume content of rock forming mineral type, rock forming mineral type.
Mud shale series of strata lithofacies divide verification method between the present invention proposes a kind of salt, according to mud shale series of strata between above-mentioned salt
After lithofacies division methods divide mud shale, identical rock is divided into using natural gamma spectra, Logging Curves signature verification
The rock of the mud shale of phase rock electrical feature having the same.
The beneficial effect of the embodiment of the present invention is:
Between a kind of salt provided by the invention mud shale series of strata lithofacies division methods by detailed investigation of related literatures, core observation and
Experimental study names main foundation as lithofacies using mineralogical composition-stratification construction-content of organic matter etc..Compared with prior art,
Since formation rock mineral constituent content is no more than 50% between salt, and under mirror other than saline minerals, terrigenous clastic and
Carbonate mineral is difficult to identify.Conventional technical means is difficult to carry out Rock naming to stratum salt and lithofacies divide.The present invention
The method combined using rock core macrostructure, the content of organic matter and rock type, according to unconventional oil and gas geology, exploitation, work
It is comprehensive to establish a kind of chott mud shale series of strata lithofacies with " four components, three end member " for principle of classification for journey integration thinking
Splitting scheme.The prediction result and exploration Comparative result of the method for the present invention, lithofacies precision of prediction with higher, practical
By force.
Mud shale series of strata lithofacies divide verification method, unified with nature gamma spectra, routine between a kind of salt provided by the invention
Log etc. identifies salt interbed lithofacies, verifies the rock feature having the same of the mud shale of identical lithofacies, so that it is determined that drawing
Divide the science of method.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be to needed in the embodiment attached
Figure is briefly described, it should be understood that the following drawings illustrates only certain embodiments of the present invention, therefore is not construed as pair
The restriction of range for those of ordinary skill in the art without creative efforts, can also be according to this
A little attached drawings obtain other relevant attached drawings.
Fig. 1 is the triangular structure genetic classification figure of rock provided in an embodiment of the present invention and lamellar limestone；
Fig. 2 is that lithofacies provided in an embodiment of the present invention name schematic diagram；
Fig. 3 is Wang99Jing provided in an embodiment of the present invention latent 34- 10 rhythm rock cores；
Fig. 4 is king 4 provided in an embodiment of the present invention oblique 7-7 well (1775.38m) scanning electron microscope algae bonding construction；
Fig. 5 is oblique 7-7 well (1770.24m) the scanning electron microscope DOLOMITE CRYSTALS of king 4 provided in an embodiment of the present invention；
Fig. 6 is Wang99Jing provided in an embodiment of the present invention (1780.93m) terrigenous clastic thin slice data；
Fig. 7 is Wang99Jing provided in an embodiment of the present invention (1678.86m) tephre thin slice data；
Fig. 8 is Wang99Jing provided in an embodiment of the present invention (1676.2m) authigenic clay mineral；
Fig. 9 is Wang4x7-7Jing provided in an embodiment of the present invention (1774m) tephre zeolite；
Figure 10 is Wang4x7-7Jing provided in an embodiment of the present invention (1772.51m) siliceous organism crumb layer；
Figure 11 is Wang4x7-7Jing provided in an embodiment of the present invention (1772.51m) silicoide；
Figure 12 is provided in an embodiment of the present invention latent 34- 10 rhythm rock core glauberite fill argillaceous dolomite crack；
Figure 13 is that graniphyric glauberite provided in an embodiment of the present invention fills cloud matter mud stone；
Figure 14 is 99 well 1691.8m rock core of king provided in an embodiment of the present invention；
Figure 15 is Wang99Jing provided in an embodiment of the present invention latent 34- 10 cyclothemic deposition lithofacies histograms；
Figure 16 is Wang99Jing provided in an embodiment of the present invention latent 34- 10 histograms of lithofacies division now；
Figure 17 is Wang99Jing provided in an embodiment of the present invention latent 34- 10 well log interpretation figures；
Figure 18 is oblique 7 well of freshwater mussel provided in an embodiment of the present invention latent 34- 10 rhythm rock core informations；
Figure 19 is oblique 7 well of freshwater mussel provided in an embodiment of the present invention latent 34- 10 rhythm scanning electron microscope data；
Figure 20 is oblique 7 well of freshwater mussel provided in an embodiment of the present invention latent 34- 10 cyclothemic deposition lithofacies divide histogram；
Figure 21 is oblique 7 well of freshwater mussel provided in an embodiment of the present invention latent 34Lithofacies divide histogram to -10 rhythms now；
Figure 22 is oblique 7 well of freshwater mussel provided in an embodiment of the present invention latent 34- 10 well log interpretation figures.
Specific embodiment
It in order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below will be in the embodiment of the present invention
Technical solution be clearly and completely described.The person that is not specified actual conditions in embodiment, according to normal conditions or manufacturer builds
The condition of view carries out.Reagents or instruments used without specified manufacturer is the conventional production that can be obtained by commercially available purchase
Product.
Application is more widely the Classification of Shales method based on main mineral constituent at present, with carbonate mineral, length
English matter mineral and clay mineral are the graphical method of three end members, and inside subdivision name uses three-level nomenclature principle.Its naming method is:
Think all shale and lamellar limestone is all basic by cryptocrystal carbonate lamina, clay lamina and rich organic matter lamina etc. 3
Unit composition, only in different shale, combination, ratio and the stability difference of lamina.Therefore, it can apply
Triangle classification chart carries out genetic classification to shale.The classification chart mainly determines rock according to the ratio of different type lamina in shale
Stone type, as shown in Figure 1.
In practice, inventor find the classification schemes the problem is that: 1. the classification schemes have ignored organic matter group
Divide and is dividing the effect in mud shale lithofacies；2. there has been no unified understanding, mud in deposition educational circles for the meaning of mud shale and use
The concepts such as rock, shale, clay rock are obscured or are often used in the presence of overlapping；3. lithofacies do not consider rock structure feature when classifying；
4. some terms cannot be abolished, such as oil shale easily due to frequently using and regional sanctified by usage；5. this method usually with
50% method for determining rock important name for boundary.But there are peperites in mud shale system, wherein constituting each of mud shale
Constituent content (such as clay mineral, flour sand, calcareous) is no more than 50%, brings name difficult.
Mud shale series of strata lithofacies division methods a kind of salt of the embodiment of the present invention and verification method are carried out below specific
Explanation.
The embodiment of the present invention provides mud shale series of strata lithofacies division methods between a kind of salt, and the lithofacies of mud shale include stratification class
Type contains carbon type and rock type, as shown in Fig. 2, division methods mainly comprise the steps that
1, macrostructure determines
(1) it determines stratification thickness: observing lithology, color, structure, the sedimentary structure, crack, oily of the rock core of mud shale
Property etc., formation rock stratification is extremely developed between salt, mainly based on horizontal lamination.Glauberite major developmental in salt interbed lower part,
It is filled in secondary fracture；
By the stratification thickness of core observation and the determining mud shale of optical microscopy identification to mud shale, and according to stratification
Whether thickness divides the stratification construction of mud shale more than 10cm, determines the macrostructure type of mud shale；
Stratification with a thickness of lamina spacing, bulk, the lamina spacing that stratification type includes: lamina spacing greater than 10cm be 1~
The stratiform of 10cm, the lamellar that lamina spacing is 0.1~1cm.
(2) it determines rock forming mineral type: determining the rock forming mineral type of mud shale using total rock ensaying measurement rock core；
Mud shale major developmental in stratum is carbonate, sulfate and clastic rock three categories mineral, wherein carbonate mine between salt
Object mainly includes calcite, dolomite, and sulfate mineral mainly includes glauberite, gypsum, anhydrite, and clastic rock mineral mainly wrap
Include clay, quartz, potassium feldspar, plagioclase；
In embodiments of the present invention, total rock ensaying is carried out to mud shale using total rock X diffraction measuring technology.
2, abundance of organic matter determines
The abundance of organic matter of mud shale is determined by being pyrolyzed organic carbon analysis, abundance of organic matter is the content of organic matter.Exploration
Show that the main hydrocarbon content of organic matter is generally big between Qianjiang Subbasin Qianjiang Formation salt in mud shale with research achievement
In equal to 2%；
Mud shale is divided into three categories accordingly, includes: the rich carbon that the content of organic matter is greater than or equal to 2% containing carbon type
The poor carbons for being lower than 0.5% containing carbons, the content of organic matter of class, the content of organic matter 0.5~2%；
In embodiments of the present invention, pyrolysis organic carbon analysis is carried out to mud shale using pyrolysis instrument.
3, rock forming mineral component determines
The rock corresponding to rock forming mineral type for determining mud shale is observed using thin slice under total rock ensaying combination mirror
Mineral volume content obtains the volume content of detrital component, calcite component, dolomite constituents；
Rock type includes being contained according to detrital mineral component, calcite component, the volume of dolomite constituents in mud shale
Measure grey matter mud stone, cloud matter mud stone and the argillaceous dolomite for being divided into mud shale；
In embodiments of the present invention, it is sampled with the sampling density of 3~8cm, is combined using total rock X diffraction measuring technology
Thin slice observes the rock forming mineral volume content corresponding to rock forming mineral type for determining mud shale under mirror.
4, lithofacies divide
" four components, three end member " principle classification based on rock type, according to detrital mineral component, Fang Xie in mud shale
Stone component, dolomite constituents volume content divide mud shale rock type, wherein four groups be divided into detrital mineral, calcite,
Dolomite, organic matter fraction, three end members are detrital mineral, calcite, dolomite；
The lithofacies of mud shale are divided using the method that rock constituents-stratification construction-organic matter combines, rock constituents include
The corresponding rock forming mineral volume content of rock forming mineral type, rock forming mineral type.According to the occurrence and quantity of secondary mineral, in the past
Sew form and reflects secondary lithofacies.
Mud shale series of strata lithofacies divide verification method between the embodiment of the present invention also provides a kind of salt, according to mud between above-mentioned salt
After shale series of strata lithofacies division methods divide mud shale, divided using natural gamma spectra, Logging Curves signature verification
At the rock of the mud shale of identical lithofacies rock electrical feature having the same.
Feature and performance of the invention are described in further detail with reference to embodiments.
Embodiment 1
The embodiment of the present invention provides mud shale series of strata lithofacies division methods and verification method between a kind of salt.
In Qianjiang Subbasin Wangchang area Wang99Jing and the oblique wellblock the 7-7 block Eq3 of development well king 44Between 10 rhythm salt
Mud shale series of strata lithofacies are applied in dividing.Mainly include the following steps:
1, macrostructure determines
Using prospect pit Wang99Jing, the oblique 7-7 well of development well king 4 to latent 34- 10 rhythms carry out coring, and coring footage is respectively
16.83m,17.83m.The jacket layer top, bottom are Salt layer, and centre is rich organic matter cloud/grey matter mud shale layer.Rock in macro-scale
The development of the heart laminated structure of shale, rock core is substantially flaky, shows that salt interbed lamina is developed very much perpendicular to the thin slice of bed plane, most thin thickness
Less than 1mm, as shown in Figure 3.By diving 3 to Wang99Jing4- 10 rhythm 7m rock core fine descriptions, the laminated structure of shale are generally developed, and develop line altogether
1384, layer.Traditional lithofacies analysis is mainly according to core description and thin section identification, other than lamina and secondary filling mineral, to salt
Between fine-grained sediment, conventional method cannot accurately determine lithology.
According to total rock x- diffraction analysis, sedimentary mineral complicated component between salt is found；Hand specimen, thin slice and sem analysis, instruction
There are many origin causes of formation for the carbonate mineral of fine-grained sediment, clast class mineral between salt, and glauberite mineral are mostly the secondary filling in crack.Pass through
Scanning electron microscopic observation under mirror, chemically precipitated mineral and biological effect are closely related in shale formation between salt, and cryptocrystalline calcite is general
All over having algae bonding construction, standard has with raw crystallite DOLOMITE CRYSTALS aligns feature, as shown in Figures 4 and 5.
3 are dived by Wang99Jing4Under the microscope, it is Lu Yuan respectively that detrital mineral mainly has two sources to the sample of -10 rhythms
Clast and tephre, terrigenous clastic mineral generally have the characteristics that psephicity is high, and the tephre of various sizes is in concordant point
Cloth, as shown in FIG. 6 and 7.
Source there are two types of also having by scanning electron microscopic observation clay mineral, one is the rock bases of authigenic clay mineral formation
Matter, one is tephre zeolite, observing zeolite generally has a large amount of dissolution pores, as can be seen from figures 8 and 9.
Under the microscope to siliceous class mineral tool there are two types of the origin cause of formation, be respectively siliceous organism crumb layer in white clouds matter shale and
The silicoide that cyanobacteria glue sheath standard is formed with raw phase metasomasis, as shown in Figures 10 and 11.
Glauberite between hand specimen, thin slice and sem analysis instruction salt in stratum is mostly secondary fracture filling, is observed on rock core
Glauberite is in veiny or plaque-like frac-pack more, and is filled in salt interbed bottom.It is first under the microscope quartz cementation to crack,
Glauberite both direction above and below crack is had the gap at closure, fills a small amount of clay mineral, quartz and crude oil to interstitial growth,
As shown in FIG. 12 and 13.
2, abundance of organic matter determines
By taking 99 well 1691.8m lamina sample of king as an example, as shown in figure 14.The TOC of No. 1 lamina mineral is 5.04%；No. 2 lines
The TOC of layer mineral is 4.92%；The TOC of No. 3 lamina mineral is 5.3%.
3, rock forming mineral component determines
By taking 99 well 1691.8m lamina sample of king as an example, as shown in figure 14.No. 1 lamina mineralogical composition is dolomite respectively
39.29%, detrital mineral 52.38%, calcite 8.33%；No. 2 lamina mineralogical compositions are dolomite 25.30%, clast respectively
Mineral 62.65%, calcite 12.05%；No. 3 lamina mineralogical compositions be respectively dolomite 53.41%, detrital mineral 40.91%,
Calcite 5.68%.
4, lithofacies divide
3 are dived to Wang99Jing4The mineralogical composition of -10 rhythms is counted, by clast class mineral, calcite, dolomite etc. three
The rock type of major class divides, predominantly grey matter mud stone, cloud matter mud stone and argillaceous dolomite.By above-mentioned Name Principle, by 9m
Rock core is broadly divided into three big lithofacies, and most is rich carbon lamellar cloud matter mud stone phase, total 4.8m, accounts for 53% of stratum between salt,
Secondary is rich carbon Laminated muddy dol omite phase, total 2.6m, accounts for 29% of stratum between salt, least for rich carbon lamellar grey matter mud stone
Phase, total 1.6m account for stratum 18% between salt, as shown in figure 15.
In conjunction with deposition class mineral and secondary mineral, lithofacies comprehensive division, stratum bottom lamina between salt are carried out between stratum salt
Shape cloud matter mud stone will be divided into four major class by Diagenetic Facies now mainly by the secondary filling of glauberite lithofacies, respectively rich carbon line
Laminar shale dolomitic facies, rich carbon lamellar cloud matter mud stone phase, rich carbon lamellar grey matter mud stone phase, rich carbon glauberite fill lamina
Shape cloud matter mud stone phase, as shown in figure 16.
5, logging response character is verified
Comprehensive Experiment analysis and research result, natural gamma spectra, ordinary curve feature divide lithology.Latent 34- 10 rhythms
Lithology is divided into three sections from top to bottom: rich carbon Laminated muddy dol omite phase, rich carbon lamellar cloud/grey matter mud stone phase, rich carbon calcium awns
Nitre fills lamellar cloud matter mud stone phase.As shown in figure 17, wherein rock electrical feature mainly shows following characteristics:
Salt lithofacies-low natural gamma, low-density, infrasonic wave, advanced induction motor；
Rich carbon Laminated muddy dol omite phase-high natural gamma, praetersonic, advanced induction motor, low helium-uranium ratio；
Rich carbon lamellar cloud/grey matter mud stone phase-middle natural gamma, middle density, praetersonic, middle helium-uranium ratio；
Rich carbon glauberite fills lamellar cloud matter mud stone phase-middle natural gamma, high density, middle sound wave, low deep induction resistance
Rate, low helium-uranium ratio.
Embodiment 2
The embodiment of the present invention provides mud shale series of strata lithofacies division methods and verification method between a kind of salt.
In the Qianjiang Subbasin Banghu syncline north slope oblique 7 well Eq3 of freshwater mussel4Mud shale series of strata lithofacies between -10 rhythm salt
It is applied in division.Mainly include the following steps:
1, macrostructure determines
Oblique 7 well of freshwater mussel latent 34- 10 rhythm coring footage 19.89m, the long 19.5m of the heart, as shown in figure 18.10 rhythm of core observation
Top is 15m thickness salt deposit, and salt interbed is with a thickness of 15m, predominantly argillaceous dolomite, cloud/grey matter mud stone, the development of rock core lamina, meat
Eye observation diagenesis is stronger, lower part major developmental glauberite matter mud stone.
Oblique 7 well of microscopic observation freshwater mussel latent 34- 10 rhythm thin slice data, as shown in figure 19, terrigenous clastic is mainly with quartz, feldspar
Based on, mostly in time secondary round shape of prismatic-, glauberite is enriched in layer, and rock is shown in obvious laminated structure.
2, abundance of organic matter determines
Oblique 7 well of freshwater mussel latent 34The TOC of -10 rhythm lamina mineral sequentially consists of 1.63%, 1.86% and 2.60%.
3, rock forming mineral component determines
Latent 3 are obtained using total rock X diffraction measuring technology4- 10 rhythm rock mine data, mineralogical composition mainly with clast class,
Based on carbonate, Sulfates mineral, wherein quartz+feldspar content 16.45%, clay mineral 28.36%, calcite
18.02%, dolomite 23.50%, Sulfates 7.31%, salt 0.41%, siderite and pyroxene 0.55%.
4, lithofacies are divided
Oblique 7 well of freshwater mussel latent 34- 10 rhythm major developmental richness carbon lamellar grey matter mud stone phases, carbon containing blocky cloud-grey matter mud stone phase,
Carbon containing bulk cloud matter mud stone phase.By above-mentioned Name Principle, 15.72m rock core is divided into three classes lithofacies, as shown in figure 20, from
Under supreme be followed successively by carbon containing blocky cloud matter mud stone phase, carbon containing blocky cloud-grey matter mud stone phase, rich carbon lamellar grey matter mud stone phase.
In conjunction with deposition class mineral and secondary mineral, lithofacies comprehensive division is carried out between stratum salt, stratum top/bottom part contains between salt
Carbon block shape cloud matter mud stone will be divided into three categories by Diagenetic Facies now mainly by the secondary filling of glauberite lithofacies, such as Figure 21 institute
Show, sequentially consists of carbon containing glauberite and fill blocky cloud matter mud stone phase (2.64m), carbon containing blocky cloud-grey matter mud stone phase
(9.96m), rich carbon lamellar grey matter mud stone phase (2.56m), carbon containing glauberite fill blocky cloud matter mud stone phase (0.56m).Wherein
Carbon containing bulk cloud-grey matter mud stone phase takes up an area layer 63.4%, secondly fills blocky cloud matter mud stone phase for carbon containing glauberite and takes up an area thickness
Degree 16.79%, in addition rich carbon lamellar grey matter mud stone phase accounts for formation thickness 16.27%.
5, logging response character is verified
Comprehensive Experiment analysis and research result, ordinary curve feature divide lithology.Oblique 7 well of freshwater mussel latent 34The lithology of -10 rhythms is certainly
Three sections can be divided on down: rich carbon lamellar grey matter mud stone, carbon containing blocky cloud-grey matter mud stone phase, the filling of carbon containing glauberite are blocky
Cloud matter mud stone phase.As shown in figure 22, wherein rock electrical feature mainly shows following characteristics:
The low natural gamma of rock salt-, low-density, infrasonic wave；
Rich carbon lamellar grey matter mud stone phase-middle natural gamma, middle density, middle sound wave,；
Carbon containing bulk cloud/grey matter mud stone phase-middle high natural gamma, middle density, middle sound wave；
Carbon containing glauberite fills blocky cloud matter mud stone phase-middle natural gamma, middle-high density, infrasonic wave.
In conclusion mud shale series of strata lithofacies division methods between a kind of salt of the embodiment of the present invention, pass through lot of documents tune
It grinds, core observation and experimental study, main foundation is named as lithofacies using mineralogical composition-stratification construction-content of organic matter etc..With
The prior art is compared, since formation rock mineral constituent content is no more than 50% between salt, and under mirror in addition to saline minerals it
Outside, terrigenous clastic and carbonate mineral are difficult to identify.Conventional technical means is difficult to carry out Rock naming and rock to stratum salt
Mutually divide.The method that the present invention uses rock core macrostructure, the content of organic matter and rock type to combine, according to unconventional oil and gas
Geology, exploitation, engineering integration thinking establish a kind of chott mud shale with " four components, three end member " for principle of classification
Series of strata lithofacies comprehensive division scheme.
Since the volume content of organic matter, detrital component, calcite component and dolomite constituents has respectively represented mud shale
Biodeposition, mechanical deposit effect and chemical deposition effect in forming process, with " four components, three end member " classification method
It names mud shale that there is Genesis Significance, also embodies main component feature complicated in mud shale.`
10 multiple wells 5 of shale exploration activity between China's Qianjiang Subbasin Qianjiang Formation salt are realized using the program
Mud shale series of strata lithofacies divide between fascicule salt, and wherein lithofacies are divided into four major class now for Wangchang area, respectively rich carbon lamina
Shape argillaceous dolomite phase, rich carbon lamellar cloud matter mud stone phase, rich carbon lamellar grey matter mud stone phase, rich carbon glauberite fill lamellar
Cloud matter mud stone phase；Lithofacies are divided into three categories now on Qianjiang Depression Banghu syncline north slope: carbon containing glauberite fills blocky cloud
Matter mud stone phase, carbon containing blocky cloud-grey matter mud stone phase, rich carbon lamellar grey matter mud stone phase.Pass through organic geochemistry, pressure mercury-suction
The technical methods such as attached simultaneous determination, pulse permeability, nanometer CT, X-ray diffraction mineral constituent, oiliness test, to different rocks
The shale oil basis of formation condition of stone facies type has carried out Comprehensive Correlation evaluation.Conclusion thinks: rich carbon Laminated muddy dol omite
Mutually have the characteristics that hydrocarbon source condition is good, Reservior Conditions are superior, oiliness is high, is the best lithofacies of oil-gas exploration and development.This hair
The prediction result and exploration Comparative result of bright method, relative error < 20%, lithofacies precision of prediction with higher, practical
Property is strong.
Mud shale series of strata lithofacies divide verification method, unified with nature gamma spectra, routine between a kind of salt provided by the invention
Log etc. identifies salt interbed lithofacies, verifies the rock feature having the same of the mud shale of identical lithofacies, so that it is determined that drawing
Divide the science of method.
Embodiments described above is a part of the embodiment of the present invention, instead of all the embodiments.Reality of the invention
The detailed description for applying example is not intended to limit the range of claimed invention, but is merely representative of selected implementation of the invention
Example.Based on the embodiments of the present invention, obtained by those of ordinary skill in the art without making creative efforts
Every other embodiment, shall fall within the protection scope of the present invention.
Claims (10)
1. mud shale series of strata lithofacies division methods between a kind of salt, which is characterized in that the division methods include:
By the stratification thickness of core observation and the determining mud shale of optical microscopy identification to the mud shale, and according to
Whether the stratification thickness divides the stratification construction of the mud shale more than 10cm, determines the macrostructure class of the mud shale
Type；
The rock forming mineral type that the rock core determines the mud shale is measured using total rock ensaying；
The abundance of organic matter for determining the organic matter phase of the mud shale by being pyrolyzed organic carbon analysis；
Observe using thin slice under total rock ensaying combination mirror the rock forming mineral type that corresponds to for determining the mud shale
Rock forming mineral volume content；
" four components, three end member " principle classification based on rock type, according to detrital mineral component, Fang Xie in the mud shale
The volume content of stone component and dolomite constituents divides the rock type of the mud shale, wherein described four groups are divided into clast mine
Object, calcite, dolomite and organic matter fraction, three end member are detrital mineral, calcite and dolomite；
The lithofacies of the mud shale, the rock constituents are divided using the method that rock constituents-stratification construction-organic matter combines
Including rock forming mineral type, the corresponding rock forming mineral volume content of the rock forming mineral type.
2. mud shale series of strata lithofacies division methods between salt according to claim 1, which is characterized in that the rock of the mud shale
It mutually include stratification type, for the stratification with a thickness of lamina spacing, the stratification type includes: the block that lamina spacing is greater than 10cm
The lamellar that stratiform that shape, lamina spacing are 1~10cm, lamina spacing are 0.1~1cm.
3. mud shale series of strata lithofacies division methods between salt according to claim 1, which is characterized in that the rock of the mud shale
It mutually include containing carbon type, the abundance of organic matter is the content of organic matter, and the carbon type that contains includes: that the content of organic matter is greater than or waits
In 2% rich carbons, the content of organic matter be lower than containing carbons, the content of organic matter 0.5~2% 0.5% poor carbons.
4. mud shale series of strata lithofacies division methods between salt according to claim 1, which is characterized in that the rock of the mud shale
It include mutually rock type, the rock type includes according to the detrital mineral component in the mud shale, the calcite
Volume content the grey matter mud stone, cloud matter mud stone and the argillaceous dolomite that are divided into mud shale of component, the dolomite constituents.
5. mud shale series of strata lithofacies division methods between salt according to claim 1, which is characterized in that the institute of the mud shale
Stating rock forming mineral type mainly includes carbonate, sulfate and clastic rock three categories mineral.
6. mud shale series of strata lithofacies division methods between salt according to claim 5, which is characterized in that the carbonate mineral
It include mainly calcite, dolomite, the sulfate mineral mainly includes glauberite, gypsum, anhydrite, the clastic rock mineral
It mainly include clay, quartz, potassium feldspar, plagioclase.
7. mud shale series of strata lithofacies division methods between salt according to claim 1, which is characterized in that utilize total rock X diffraction
Measuring technology carries out the total rock ensaying to the mud shale.
8. mud shale series of strata lithofacies division methods between salt according to claim 1, which is characterized in that using pyrolysis instrument to institute
It states mud shale and carries out the pyrolysis organic carbon analysis.
9. mud shale series of strata lithofacies division methods between salt according to claim 1, which is characterized in that utilize the total rock mine
Object analysis determines that rock forming mineral volume corresponding to the rock forming mineral type of the mud shale contains in conjunction with thin slice observation under the mirror
Amount is sampled with the sampling density of 3~8cm.
10. mud shale series of strata lithofacies divide verification method between a kind of salt, which is characterized in that salt according to claims 1 to 9
Between mud shale series of strata lithofacies division methods to the mud shale divide after, utilize natural gamma spectra, Logging Curves feature
Verify the rock rock electrical feature having the same for the mud shale for being divided into identical lithofacies.
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