CN106988737A - A kind of method that utilization lithology combination recognizes sedimentary facies - Google Patents

A kind of method that utilization lithology combination recognizes sedimentary facies Download PDF

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CN106988737A
CN106988737A CN201710292348.6A CN201710292348A CN106988737A CN 106988737 A CN106988737 A CN 106988737A CN 201710292348 A CN201710292348 A CN 201710292348A CN 106988737 A CN106988737 A CN 106988737A
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thickness
index
sandstone
mud stone
sedimentary facies
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CN106988737B (en
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周立宏
蒲秀刚
陈长伟
肖敦清
姜文亚
杨飞
朱桂娟
韩文中
张伟
时战楠
侯秀川
林常梅
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Petrochina Co Ltd
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Research Institute Of Petroleum Exploration & Development Dagang Oil Field Of Cnpc
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
    • G01V1/40—Seismology; Seismic or acoustic prospecting or detecting specially adapted for well-logging

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Abstract

The present invention relates to a kind of method that utilization lithology combination recognizes sedimentary facies, comprise the following steps：S1, collects the lithology combination index with treatment research interval；S2, depositional environment is judged using mud stone color index；S3, sedimentary facies belt is judged using mud stone thickness index；S4, material resource stability is judged using the different degree of sandstone thickness point；S5, research interval lithology is judged using the lithologic index；S6, hydrodynamic intensity is judged using sandstone grade index；S7, judges that granularity is differences using the different degree index of sandstone grade point；S8, material resource intensity is judged using sandstone thickness index；S9, studies layer lithology combination index according to gained for step S2 to step S8 and reduces sedimentary facies scope step by step so as to judge sedimentary facies；Wherein step S2 to step S8 does not have sequencing.

Description

A kind of method that utilization lithology combination recognizes sedimentary facies
Technical field
It is more particularly to a kind of to recognize deposition using lithology combination the present invention relates to the technical field of mineral products Oil ＆ Gas Resources Exploration The method of phase.
Background technology
Sedimentary facies is a part of overall picture of earth's surface within certain geologic(al) period, is depositional environment and is formed in this context Sedimentary rock (thing) feature synthesis.Oil-gas exploration can infer that adjoining area is horizontal according to the sedimentary facies sequence of vertical upper appearance Upward type and series, foundation is provided for preferred strong target area.The mode of sedimentary facies recognition can pass through outcrop, rock The heart, survey well logging and earthquake etc. data carry out synthetic determination, but its evaluation method often depends on the research experience of researcher unduly, category In qualitative analysis, and research cycle is long, and the sedimentary facies recognition of old filed is worked becomes complicated, and workload is big.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of method that utilization lithology combination recognizes sedimentary facies, Neng Goutong Cross the mud stone color index for counting related to lithology combination, mud stone thickness index, sandstone thickness point different degree, lithologic index, sandstone Grade index, sandstone grade point different degree, sandstone thickness index, the depositional environment and deposition characteristicses of descriptive study interval, so that it is comprehensive Conjunction judges sedimentary facies.
The technical scheme that the present invention solves above-mentioned technical problem is as follows：A kind of utilization lithology combination recognizes the side of sedimentary facies Method, comprises the following steps：S1, collects the lithology combination index with treatment research interval；S2, judges heavy using mud stone color index Product environment；S3, sedimentary facies belt is judged using mud stone thickness index；S4, material resource stability is judged using the different degree of sandstone thickness point； S5, research interval lithology is judged using the lithologic index；S6, hydrodynamic intensity is judged using sandstone grade index；S7, is utilized The different degree index of sandstone grade point judges that granularity is differences；S8, material resource intensity is judged using sandstone thickness index；S9, for step S2 to step S8 studies layer lithology combination index according to gained and reduces sedimentary facies scope step by step so as to judge sedimentary facies；Wherein Step S2 to step S8 does not have sequencing.
The beneficial effects of the invention are as follows：In collection, treatment research interval lithology combination data, by defining and counting each layer Section lithology combination index, the geological Significance further represented analysis different lithology combinatorial index, realizes quantitative identification level Four layer more Sequence stratified sedimentation is combined and Pyatyi sequence stratification sedimentary facies.
On the basis of above-mentioned technical proposal, the present invention can also do following improvement.
Further, lithologic log data is passed through in the method that a kind of utilization lithology combination recognizes sedimentary facies, step S1 Lithology combination index is determined, the individual-layer data of well location has been obtained according to survey log data, according to features of logging curve, lithology is recorded Sand shale thickness in well data, starting interface is corrected, and finally gives the lithology combination index of the well location.
Beneficial effect using above-mentioned further scheme is：Lithology combination index is based on log data, and log data is in reality In the acquisition process of border, often occur and be not inconsistent with actual conditions, and log data can discharge artificial influence substantially, this step is In order to correct log data using log data, relatively objective lithology combination index is obtained.
Further, in the method that a kind of utilization lithology combination recognizes sedimentary facies, step S2, mud stone color index IciQuilt It is defined as
H in formula (1)dgFor Dark grey mud stone thickness；HgrFor grey mud stone thickness；HgFor green mud stone thickness；HprTo be red Purple brown mud stone thickness；HmFor mud stone thickness；
In step S3, mud stone thickness index (number of plies of 100m mud stone) ImiIt is defined as
N in formula (2)msFor the total number of plies of mud stone；HmFor mud stone gross thickness；
The different degree I of sandstone thickness point in step S4sdIt is defined as
H in formula (3)ssFor siltstone average thickness；HfFor packsand average thickness；HmsFor middle sandstone average thickness；Hg For gritstone average thickness；HatFor sandstone average thickness；
Lithologic index I in step S5lIt is defined as：
H in formula (4)mFor mud stone thickness；HasFor argillaceous sandstone thickness；HsFor sandstone thickness；HstFor formation thickness；
Sandstone grade index I in step S6fIt is defined as：
H in formula (5)ssFor siltstone thickness；HfFor packsand thickness；HmsFor middle sandstone thickness；HgFor gritstone thickness；
The different degree index I of grade point in step S7dIt is defined as
α in formula (6)ssFor siltstone in sandstone percentage；αfFor packsand in sandstone percentage；αms For middle sandstone in sandstone percentage；αgFor middle sandstone in sandstone percentage；
Sandstone thickness index (number of plies of 100m sandstone) I in step S8stIt is defined as
N in formula (7)sFor the total number of plies of sandstone；HssFor siltstone thickness；HfFor packsand thickness；HmsFor middle sandstone thickness； HgFor gritstone thickness.
Beneficial effect using above-mentioned further scheme is：Each lithology combination index is defined, 7 kinds of lithology combination indexes are utilized Quantitative description studies interval lithology combination information, is that quantitative judge sedimentary facies and sedimentary tacies association provide foundation.
Further, mud stone color index in the method that a kind of utilization lithology combination recognizes sedimentary facies, step S2<0.1 Represent strong reducing environment, 0.1≤mud stone color index<0.3 represents weak reducing environment, 0.3≤mud stone color index<0.6 represents Weak oxide environment, mud stone color index >=0.6 represents Strong oxdiative environment.
Beneficial effect using above-mentioned further scheme is：Judge research interval redox ring using mud stone color index Border, reduces the sedimentary tacies association scope being likely to occur.
Further, mud stone thickness index in the method that a kind of utilization lithology combination recognizes sedimentary facies, step S3<15, There is Deep lacustrine deposits facies tract；15≤mud stone thickness index<30, there is half Deep lacustrine deposits facies tract；Mud stone thickness index >=30, occur Shore Vlei sedimentary facies belt.
Further, when the different degree of sandstone thickness point in the method that a kind of utilization lithology combination recognizes sedimentary facies, step S4 Less than 2 and more than 0 when, represent deposition the existing coarse sands layer of interval also have fine sand layer, with mutation the characteristics of；When sandstone thickness point is different During degree relatively larger than 2, represent that the sandstone of a certain lithology thickness in deposition interval is dominant, be quiet depositional environment.
Beneficial effect using above-mentioned further scheme is：Differentiate prominent residing for research interval using the different degree of sandstone thickness point Become or quiet depositional environment, for distinguishing gravitational flow deposits system and drag flow sedimentary system.
Further, lithologic index >=0.75, generation in the method that a kind of utilization lithology combination recognizes sedimentary facies, step S5 Table richness sand mold；0.5≤lithologic index<0.75, represent chiltern type；0.25≤lithologic index<0.5, represent and contain sand mold；Lithologic index <0.25, represent poor sand mold.
Beneficial effect using above-mentioned further scheme is：Judged using lithology combination index between crystallizing field and material resource Relation, by contrasting the sedimentary facies that different lithology index is likely to occur, can further reduce sedimentary facies range of choice.
Further, sandstone grade index is more than in the method that a kind of utilization lithology combination recognizes sedimentary facies, step S6 When 0.5, strong hydrodynamic force depositional environment represent；When sandstone grade index is less than 0.5, relatively quiet depositional environment represent.
Beneficial effect using above-mentioned further scheme is：It is anti-using sandstone grade index under drag flow control condition Reflect in deposition process and carry the hydrodynamic condition of detrital material, further screen what is be likely to occur according to the power of hydrodynamic condition Sedimentary facies.
Further, the different degree of sandstone grade point refers in the method that a kind of utilization lithology combination recognizes sedimentary facies, step S7 When number is less than 0.5, fast deposition represent；When the different degree index of grade point is more than 0.5, with drag flow deposition characteristicses.
Beneficial effect using above-mentioned further scheme is：The distance of material resource, nearly thing are judged using the different degree of sandstone grain point Source condition easily forms the nearly source fan body of offshore, and rich mud sedimentary facies is easily formed away from source area.
Brief description of the drawings
Fig. 1 is flow chart of steps of the present invention；
Fig. 2 is sedimentary tacies association, sedimentary facies recognition flow chart in one embodiment of the invention.
Embodiment
The principle and feature of the present invention are described below in conjunction with accompanying drawing, the given examples are served only to explain the present invention, and It is non-to be used to limit the scope of the present invention.
The material composition of terrestrial lake basin terrigenous clastic sedimentary system is based on the detrital materials such as sand, flour sand, clay, often at present Sedimentary system classification prevailing physical geography condition using in depositional environment, as Main Basiss, is combined in practical application Terrigenous clastic rock sedimentary system can be divided into ALLUVIAL FAN SYSTEM, flood by sediment dynamics, deposition characteristicses and other sedimentary conditions Product fan body system, fluvial system, delta regime, braid deltas system, fan delta system, gravity stream system and lake body System, each sedimentary system includes several sedimentary tacies association and sedimentary facies again, as shown in table 1.
The continental clastic deposited sediments system of table 1
By extracting, lithologic character, hydrodynamic condition, granularity included in lithology combination index be differences, material resource is strong Degree, material resource stability, depositional environment and sedimentary facies belt information, synthetic determination research layer position belonging to sedimentary facies, specifically include with Lower step：
S1, collects the lithology combination index with treatment research interval.
S2, depositional environment is judged using mud stone color index.
S3, sedimentary facies belt is judged using mud stone thickness index.
S4, material resource stability is judged using the different degree of sandstone thickness point.
S5, research interval lithology is judged using the lithologic index.
S6, hydrodynamic intensity is judged using sandstone grade index.
S7, judges that granularity is differences using the different degree index of sandstone grade point.
S8, material resource intensity is judged using sandstone thickness index.
S9, studies layer lithology combination index according to gained for step S2 to step S8 and reduces sedimentary facies scope step by step So as to judge sedimentary facies；Wherein step S2 to step S8 does not have sequencing.
Wherein, step S2 to step S8 does not have sequencing, and it judges according to research layer concrete condition.
In step 1) in, lithologic log data is to determine one of main technique methods of lithology combination index, is provided by well logging Expect the limitation of precision, often also need to be corrected lithologic log data according to log.
Specifically, lithologic log data be to determine lithology combination feature key data source, but lithologic log data by Make a trip, make up a joint, drilling and coring delivery, when boring, the influence of the factor such as circulation of drilling fluid flow, reduce the resolution of logging data Rate, it is therefore desirable to be corrected by well logging and coring data to log data.During to certain well sedimentary facies recognition, root The three-level and four stage layereds of the well location are obtained according to survey log data, according to features of logging curve, to sand in lithologic log data Mud stone thickness, starting interface is corrected, and finally gives the lithology combination index of the well.
Sand shale Back ground Information is counted.Lithology combination index is according to sand shale Back ground Information calculating in lithology combination section , sandstone Back ground Information and Mudstone Foundation information two parts are specifically divided into, this two classes data is obtained by statistical method.
Sandstone Back ground Information includes sandstone thickness, the sandstone number of plies, conglomerate thickness, the conglomerate number of plies, middle sandstone thickness, middle sandstone The number of plies, packsand thickness, the packsand number of plies, siltstone thickness, siltstone number of plies etc..Pass through the sandstone Back ground Information to the well section Statistics finds that the well agensis Conglomerate Section, its sandstone Back ground Information is as shown in table 2.
Certain well of table 2 is respectively layered sandstone Back ground Information in section
The gross thickness and total number of plies of layer position where sandstone thickness and the sandstone number of plies represent it respectively in table 2.
Mudstone Foundation information includes formation thickness, mud stone thickness, the mud stone number of plies, purple brown mud stone thickness, green mud stone Thickness, grey mud stone thickness, dark mud rock thickness, oil shale thickness etc..The Mudstone Foundation data statistics of the well is as shown in table 3.
Certain well of table 3 is respectively layered Mudstone Foundation information in section
According to the obtained sand shale Back ground Information of statistics calculate the mud stone color index of each layering section, mud stone thickness index, The different degree of sandstone thickness point, rock parameter, sandstone grain size parameters, sandstone grade point different degree, sandstone thickness index.Below with aperture leakage Exemplified by, show computational methods：
In step s 2, mud stone color index IciIt is defined as
H in formula (1)dgFor Dark grey mud stone thickness；HgrFor grey mud stone thickness；HgFor green mud stone thickness；HprTo be red Purple brown mud stone thickness；HmFor mud stone thickness.
Mud stone color index is used for the depositional environment of evaluation study interval.The mud stone of red and brown often oil-containing irony bag Shell, represents oxide deposition environment.The mud stone of green contains chlorite and illite, and lacks bloodstone, organic matter and sulfide, Semi-oxidized semi-reduction environment is represent, Dark grey, the color of grey mud stone are mainly influenceed by the sulfide of organic matter and iron, represented Reducing environment.Mud stone color is bigger, represents the stronger depositional environment of oxidability, and such as delta-plain facies and fan dalta sink Product phase.By counting each interval mud stone color index, according to different mud stone color indexs represent depositional environment and be likely to occur Sedimentary facies table as shown in table 4, judge the sedimentary tacies association that deposition of layers section is likely to occur.
The different mud stone color index depositional environments represented of table 4 and the sedimentary tacies association being likely to occur
In embodiment, as shown in table 3, aperture leakage Dark grey mud stone thickness HdgFor 35.5m；Grey mud stone thickness HgrFor 12.5m；Green mud stone thickness HgFor 0m；Purple brown mud stone thickness is HprFor 21m；Mud stone thickness HmFor 100.5m, substitute into public Formula (1)：
Calculate, aperture leakage mud stone color index is 0.32, is weak oxide depositional environment as shown in table 4.
In step s3, mud stone thickness index (number of plies of 100m mud stone) ImiIt is defined as
N in formula (2)msFor the total number of plies of mud stone；HmFor mud stone gross thickness.
Mud stone thickness index refers to the number of plies included in 100 meters of mud stone, and its value is bigger, indicates average individual layer mud stone thickness It is smaller.The facies tract of mud stone development is the deep lake-depth lake of shore Vlei-half successively, and difference has been such as the mud stone thickness that isopic zone is developed Shown in table 5.The half deep regional individual layer dark mud rock thickness in lake-depth lake is gradually gradually thin to shore Vlei direction.According to mud stone thickness index Size can indicate study interval sedimentary facies belt.When mud stone thickness index is smaller, deep lake-half Deep lacustrine deposits phase is represented.Mud When rock thickness index is larger, shore Vlei depositional environment is indicated.
Relation between the mud stone thickness index of table 5 and sedimentary facies belt
Mud stone thickness index The sedimentary facies belt being likely to occur
(Imi<15) Deep lake
(15≤Imi<30) Half deep lake
(Imi≥30) Shore Vlei
In embodiment, as shown in table 3, the total number of plies N of aperture leakage mud stonemsFor 39 layers, mud stone gross thickness HmFor 100.5m, generation Enter formula (2)：
Calculate, aperture leakage mud stone thickness index is 38.81, and as shown in table 5, the thickness stability of mud stone is medium, table It is now shore Vlei facies tract.
Sandstone thickness divides different degree I in step s 4sdIt is defined as
H in formula (3)ssFor siltstone average thickness；HfFor packsand average thickness；HmsFor middle sandstone average thickness；Hg For gritstone average thickness；HatFor sandstone average thickness.
The different degree of sandstone thickness point indicates the difference between different lithology sand thickness.When sandstone thickness point different degree be less than 2 and During more than 0, represent deposition the existing coarse sands layer of interval also have fine sand layer, depositional environment is complex, with mutation the characteristics of, one The timing phase receives fine-grained sediment, the thicker deposit of granularity occurs in another period, with event deposit feature.When sandstone is thick When the different degree of degree point is relatively larger than 2 and is more than 0, represent that the sandstone of a certain lithology thickness in deposition interval is dominant, index is more pacified Quiet depositional environment.The different degree of sandstone thickness point can be for differentiation gravitational flow deposits system and drag flow sedimentary system.
In embodiment, as shown in table 2, aperture leakage siltstone thickness is 67.5m, and the siltstone number of plies is 27 layers, siltstone Average thickness HssFor 2.5；Packsand thickness is 32m, and the packsand number of plies is 14 layers, packsand average thickness HfFor 2.3；Middle sandstone Thickness is 2m, and the middle sandstone number of plies is 1 layer, middle sandstone average thickness HmsFor 2m；Sandstone thickness is 101.5m, and the sandstone number of plies is 42 Layer, sandstone average thickness HatFor 2.4, above-mentioned parameter is substituted into the different degree calculation formula (3) of sandstone point
Calculate, the different degree of aperture leakage sandstone thickness point is 1.73, and Sandstone Types mainly include Extra-fine sand rock, Extra-fine sand rock Thickness in monolayer is more or less the same, and the different degree of sandstone thickness point is larger, shows as drag flow deposition.
Lithologic index I in step s 5lIt is defined as：
H in formula (4)mFor mud stone thickness；HasFor argillaceous sandstone thickness；HsFor sandstone thickness；HstFor formation thickness.
Sandstone is source area rock through weathering, degrades, carries and formed in basin, the distribution of sandstone distribution spatially The relation that feature reflects between crystallizing field and material resource.It is more strong that the lithologic index larger part of sandstone often appears in material resource influence Place.The present invention is using lithologic index I1To represent the lithology of research interval, according to the size of lithologic index, research interval It is divided into rich sand (Il>=0.75), chiltern (0.5≤Il<0.75), containing sand (0.25≤Il<0.5) with poor sand (Il<0.25) 4 levels Not.The sedimentary facies being likely to occur for different lithologic indexs is different, as shown in table 6, and lithologic index can be used for the origin cause of formation combined The differentiation of interior sedimentary facies.
The sedimentary facies that the different sand factors of table 6 are likely to occur
In embodiment, as shown in table 2, table 3, aperture leakage sandstone thickness HsFor 101.5m, mud stone thickness HasFor 100.5m, Formation thickness HstFor 325.5m, lithologic index formula (4) is substituted into
Calculate, aperture leakage lithologic index is 0.31, be derived as containing sand mold by table 4.
Sandstone grade index I in step s 6fIt is defined as：
H in formula (5)ssFor siltstone thickness；HfFor packsand thickness；HmsFor middle sandstone thickness；HgFor gritstone thickness.
Sediment Characteristics can reflect hydrodynamic condition during deposits, and deposit is during carrying, coarse sand It is eager to excel than the hydrodynamic force needed for fine sand, sandstone grade index can reflect the hydrodynamic intensity of research interval deposition period.When When grade index is more than 0.5, strong hydrodynamic force depositional environment is represent, when grade index is less than 0.5, it is relatively quietly heavy to represent Product environment.
In embodiment, as shown in table 2, aperture leakage siltstone thickness HssFor 67.5m, packsand thickness HfFor 32m, middle sand Rock thickness HmsFor 2m, gritstone thickness HgFor 0m, above-mentioned parameter is substituted into sandstone grade formula of index (5)
Calculate, aperture leakage sandstone grade index is 0.34, and hydrodynamic condition is weaker, the interval is deposited with Extra-fine sand rock Dominance, coarse grain particles are less, show as the characteristics of remote source is deposited.
Grade divides different degree index I in the step s 7dIt is defined as
α in formula (6)ssFor siltstone in sandstone percentage；αfFor packsand in sandstone percentage；αms For middle sandstone in sandstone percentage；αgFor middle sandstone in sandstone percentage.
The grade of sandstone point different degree is used for the granularity Differentiation Features for describing to deposit interval, and it can be for indicating the layer indirectly The sorting feature of position.When the different degree index of grade point is less than 0.5, indicate that the sandstone ratio of research interval kind grade is more equal Weighing apparatus, sorts poor, the characteristics of showing as chaotic deposit, the characteristics of it represents fast deposition, such as fan dalta, delta and gravity Flow sedimentary system.When the different degree index of grade point is more than 0.5, indicate that research interval Sandstone Compositions, than more uniform, there is good Sorting, with drag flow deposition characteristicses, such as beach dam sand sedimentary facies.
In embodiment, as shown in table 2, aperture leakage siltstone thickness HssFor 67.5m, packsand thickness HfFor 32m, middle sand Rock thickness HmsFor 2m, gritstone thickness HgFor 0m, sandstone gross thickness is 101.5m, siltstone percentage α in sandstonessFor 0.67, packsand percentage α in sandstonefFor 0.31, middle sandstone percentage α in sandstonemsFor 0.02, this is counted Divide different degree formula of index (6) according to grade is substituted into
Calculate, the different degree of aperture leakage sandstone grade point is 0.46, and point different degree is smaller, illustrates that this section of sand body sorting is relative Preferably, the front-delta deposition feature with traction flow control.
Sandstone thickness index (number of plies of 100m sandstone) I in step s 8stIt is defined as
N in formula (7)sFor the total number of plies of sandstone；HssFor siltstone thickness；HfFor packsand thickness；HmsFor middle sandstone thickness； HgFor gritstone thickness.
Sandstone thickness index refers to that 100 meters of sandstone include the number of plies, and the number of plies represents that single sand body thickness is smaller, the index Energy indicant source strength is either influenceed the intensity of size by material resource.When sandstone thickness index is more than 50, crystallizing field is indicated Influence degree by material resource is smaller.When sandstone thickness index is less than 20, illustrate that material resource supply capacity is stronger, sedimentary sand bodies also phase To stabilization, the scope that material resource is influenceed is wide, easily forms rich sand mold sedimentary facies.
In embodiment, as shown in table 2, the total number of plies N of aperture leakage sandstonesFor 42 layers, sandstone gross thickness (Hss+Hf+Hms+Hg) For 101.5m, the parameter is substituted into sandstone thickness formula of index (7)
Calculate, aperture leakage sandstone thickness index is 41.38, represent that 100m sandstone include 38 layers of sandstone, sandstone is thick Spend exponential quantity medium.
The sandstone data splitting of rest layers position can be drawn by same method, as shown in table 7：
Certain well of table 7 is mainly layered a section sandstone data splitting table
In step s 9, it is determined that the research depositional environment of interval, sedimentary facies belt, material resource stability, research interval lithology, Hydrodynamic intensity, granularity are differences, after material resource intensive parameter, binding background information, the continental clastic deposited sediments body of contrast table 1 System, can make reasonable judgement to the sedimentary facies of the interval.
In actual mechanical process, sedimentary facies (combination) is determined according to layering, corresponding layering can be with third-band sequence screen work Identify that corresponding layering can further identify sedimentary facies under sedimentary tacies association, fourth level sequence screen work.As shown in Fig. 2 root Aperture leakage is judged for weak oxide depositional environment according to mud stone color index, can be aperture leakage sedimentary tacies association range shorter to fan With, river course, alluvial flat, delta plain, braid deltas Plain, fan-delta plain, fan delta front and delta Leading edge phase, may determine that aperture leakage belongs to shore Vlei facies tract according to mud stone thickness index, can be further aperture leakage sedimentary facies Combination is contracted to river course, fan delta front and delta front, further through sandstone grade index, judges that aperture leakage is generally weak Hydrodynamic condition, aperture leakage sedimentary tacies association is finally determined as delta front.It is determined that after sedimentary tacies association, according to level Four Sequence stratification, can further identify aperture leakage sedimentary facies：Delta front includes distributary channel, distributary channel Between, estuary dam, Long-term therapy and five kinds of sedimentary facies of sheet sand, aperture leakage is judged as containing sand level by lithologic index, sedimentary facies model Enclose and be contracted to estuary dam and Long-term therapy, according to sandstone thickness index, determine that aperture leakage is influenceed greatly, to judge aperture leakage as river by material resource Mouth dam phase.
According to above thought and flow, progress sedimentary tacies association and SEDIMENTARY FACIES ANALYSIS, analysis knot are respectively layered to certain well successively Fruit is as shown in table 8-1, table 8-2.
Table 8-1 wells are mainly layered a section sedimentary facies (combination) analytical table
Table 8-2 wells are mainly layered a section sedimentary facies (combination) analytical table
Same layer position lithology combination index please checks that its sedimentary facies (combination) result please exists in combination with table 8-1 and table 8-2 Checked in table 8-2.
Can be by lithology combination index quantitative analysis sedimentary facies, for the ordinary skill people of this area by the above method For member, simply the present invention is exemplarily described for specific embodiment, it is clear that the present invention is implemented not by above-mentioned side The limitation of formula, if the improvement of the various unsubstantialities of inventive concept and technical scheme of the present invention progress is employed, or without Improve and the design of the present invention and technical scheme are directly applied into other occasions, within protection scope of the present invention.

Claims (9)

1. a kind of method that utilization lithology combination recognizes sedimentary facies, it is characterised in that comprise the following steps：
S1, collects the lithology combination index with treatment research interval；
S2, depositional environment is judged using mud stone color index；
S3, sedimentary facies belt is judged using mud stone thickness index；
S4, material resource stability is judged using the different degree of sandstone thickness point；
S5, research interval lithology is judged using the lithologic index；
S6, hydrodynamic intensity is judged using sandstone grade index；
S7, judges that granularity is differences using the different degree index of sandstone grade point；
S8, material resource intensity is judged using sandstone thickness index；
S9, for step S2 to step S8 according to gained study layer lithology combination index reduce step by step sedimentary facies scope so as to Judge sedimentary facies；Wherein step S2 to step S8 does not have sequencing.
2. a kind of method that utilization lithology combination recognizes sedimentary facies according to claim 1, it is characterised in that lead in step S1 Cross lithologic log data and determine lithology combination index, the individual-layer data of well location has been obtained according to survey log data, it is bent according to well logging Line feature, to sand shale thickness in lithologic log data, starting interface is corrected, and finally gives the lithology combination of the well location Index.
3. a kind of method that utilization lithology combination recognizes sedimentary facies according to claim 1, it is characterised in that in step S2, Mud stone color index IciIt is defined as
I c i = H d g &times; 0 + H g r &times; 0.25 + H g &times; 0.5 + H p r &times; 1 H m - - - ( 1 )
H in formula (1)dgFor Dark grey mud stone thickness；HgrFor grey mud stone thickness；HgFor green mud stone thickness；HprFor purple palm fibre Color mud stone thickness；HmFor mud stone thickness；
In step S3, mud stone thickness index (number of plies of 100m mud stone) ImiIt is defined as
I m i = N m s H m &times; 100 - - - ( 2 )
N in formula (2)msFor the total number of plies of mud stone；HmFor mud stone gross thickness；
The different degree I of sandstone thickness point in step S4sdIt is defined as
I s d = ( H s s - H a t ) 2 + ( H f - H a t ) 2 + ( H m s - H a t ) 2 + ( H g - H a t ) 2 - - - ( 3 )
H in formula (3)ssFor siltstone average thickness；HfFor packsand average thickness；HmsFor middle sandstone average thickness；HgTo be thick Sandstone average thickness；HatFor sandstone average thickness；
Lithologic index I in step S5lIt is defined as：
I l = H m &times; 0 + H a s &times; 0.25 + H s &times; 1 H s t - - - ( 4 )
H in formula (4)mFor mud stone thickness；HasFor argillaceous sandstone thickness；HsFor sandstone thickness；HstFor formation thickness；
Sandstone grade index I in step S6fIt is defined as：
I f = H s s &times; 0.25 + H f &times; 0.5 + H m s &times; 0.75 + H g &times; 1 H s s + H f + H m s + H g - - - ( 5 )
H in formula (5)ssFor siltstone thickness；HfFor packsand thickness；HmsFor middle sandstone thickness；HgFor gritstone thickness；
The different degree index I of grade point in step S7dIt is defined as
I d = ( &alpha; s s - 0.25 ) 2 + ( &alpha; f - 0.25 ) 2 + ( &alpha; m s - 0.25 ) 2 + ( &alpha; g - 0.25 ) 2 - - - ( 6 )
α in formula (6)ssFor siltstone in sandstone percentage；αfFor packsand in sandstone percentage；αmsFor in Sandstone percentage in sandstone；αgFor middle sandstone in sandstone percentage；
Sandstone thickness index (number of plies of 100m sandstone) I in step S8stIt is defined as
I s t = N s H s s + H f + H m s + H g &times; 100 - - - ( 7 )
N in formula (7)sFor the total number of plies of sandstone；HssFor siltstone thickness；HfFor packsand thickness；HmsFor middle sandstone thickness；HgFor Gritstone thickness.
4. the method that sedimentary facies is recognized according to a kind of any one of claims 1 to 3 utilization lithology combination, it is characterised in that Mud stone color index in step S2<0.1 represents strong reducing environment, 0.1≤mud stone color index<0.3 represents weak reducing environment, 0.3≤mud stone color index<0.6 represents weak oxide environment, and mud stone color index >=0.6 represents Strong oxdiative environment.
5. the method that sedimentary facies is recognized according to a kind of any one of claims 1 to 3 utilization lithology combination, it is characterised in that Mud stone thickness index in step S3<15, there is Deep lacustrine deposits facies tract；15≤mud stone thickness index<30, there is half Deep lacustrine deposits phase Band；, there is shore Vlei sedimentary facies belt in mud stone thickness index >=30.
6. the method that sedimentary facies is recognized according to a kind of any one of claims 1 to 3 utilization lithology combination, it is characterised in that In step S4 when the different degree of sandstone thickness point is less than 2 and more than 0, represent that the deposition existing coarse sands layer of interval also has fine sand layer, have The characteristics of mutation；When the different degree of sandstone thickness point is relatively larger than 2, represent that the sandstone of a certain lithology thickness in deposition interval is dominant Gesture, is quiet depositional environment.
7. the method that sedimentary facies is recognized according to a kind of any one of claims 1 to 3 utilization lithology combination, it is characterised in that Lithologic index >=0.75 in step S5, represents rich sand mold；0.5≤lithologic index<0.75, represent chiltern type；0.25≤lithology refers to Number<0.5, represent and contain sand mold；Lithologic index<0.25, represent poor sand mold.
8. the method that sedimentary facies is recognized according to a kind of any one of claims 1 to 3 utilization lithology combination, it is characterised in that When sandstone grade index is more than 0.5 in step S6, strong hydrodynamic force depositional environment represent；When sandstone grade index is less than 0.5, generation Table relatively quiet depositional environment.
9. the method that sedimentary facies is recognized according to a kind of any one of claims 1 to 3 utilization lithology combination, it is characterised in that When the different degree index of sandstone grade point is less than 0.5 in step S7, fast deposition represent；When the different degree index of grade point is more than 0.5, tool There are drag flow deposition characteristicses.
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