CN108678735A - A method of identification underground ancient times river pattern - Google Patents
A method of identification underground ancient times river pattern Download PDFInfo
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- CN108678735A CN108678735A CN201810345852.2A CN201810345852A CN108678735A CN 108678735 A CN108678735 A CN 108678735A CN 201810345852 A CN201810345852 A CN 201810345852A CN 108678735 A CN108678735 A CN 108678735A
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- 238000000034 method Methods 0.000 title claims abstract description 15
- 239000004576 sand Substances 0.000 claims abstract description 56
- 230000001186 cumulative effect Effects 0.000 claims abstract description 36
- 239000011435 rock Substances 0.000 claims abstract description 36
- 239000004575 stone Substances 0.000 claims abstract description 10
- 230000008021 deposition Effects 0.000 claims description 42
- 239000000203 mixture Substances 0.000 claims description 13
- 239000002245 particle Substances 0.000 claims description 13
- 230000005484 gravity Effects 0.000 claims description 12
- 239000000725 suspension Substances 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- 239000012530 fluid Substances 0.000 claims description 3
- 241001614291 Anoplistes Species 0.000 claims 1
- 238000009825 accumulation Methods 0.000 claims 1
- 238000013517 stratification Methods 0.000 abstract description 24
- 230000004044 response Effects 0.000 abstract description 13
- 230000015572 biosynthetic process Effects 0.000 abstract description 4
- 238000003786 synthesis reaction Methods 0.000 abstract description 2
- 235000013339 cereals Nutrition 0.000 description 43
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- 239000007789 gas Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 235000013312 flour Nutrition 0.000 description 2
- 230000005251 gamma ray Effects 0.000 description 2
- 230000002269 spontaneous effect Effects 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- BVPWJMCABCPUQY-UHFFFAOYSA-N 4-amino-5-chloro-2-methoxy-N-[1-(phenylmethyl)-4-piperidinyl]benzamide Chemical compound COC1=CC(N)=C(Cl)C=C1C(=O)NC1CCN(CC=2C=CC=CC=2)CC1 BVPWJMCABCPUQY-UHFFFAOYSA-N 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
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- 238000005452 bending Methods 0.000 description 1
- 230000002902 bimodal effect Effects 0.000 description 1
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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
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Abstract
The present invention provides a kind of methods of identification underground ancient times river pattern, based on rock type, stratification type, mud stone color and the vertical sequences of core observation and description record to cored interval, river pattern is accurately identified according to diadactic structure development degree, mechanical analysis of rock data and the probability cumulative grain size curves of the drafting synthesis in river vertical sequences.The logging response character of the main sedimentary micro in all types of rivers (sand body) is summarized, and establishes corresponding log response template, the judgement for non-cored interval and the sedimentary micro (sand body) of non-core hole.This method operability is stronger, can effectively identify the river pattern of underground development and its main sand body, and the Distribution Characteristics for accurate description and prediction fluvial sandbody provide geological model, and developing oil gas therein for Efficient Exploration provides geologic basis.
Description
Technical field
The present invention relates to subterranean river type identification fields, and in particular to a kind of side of identification underground ancient times river pattern
Method.
Background technology
Underground ancient times fluvial sandbody is important oil gas reservoir body.The Distribution Characteristics of different its sand body of river pattern and company
Continuous sex differernce is apparent, in bending wall shape as braided river sand body section, plane in the shoestring shape to interweave, generous (depth) than small,
Lateral continuity is good；Meandering stream and divide distributary sand body section be in lenticular, plane be bent ribbon, generous (depth) compares
Braided river is big, and lateral continuity is better than braided river；Braided River Sandbodies section is plate-like, and plane is in straight or smaller curvature band
Shape, generous (depth) than big, lateral continuity is good.Therefore identification underground ancient times river pattern, and then predict that the distribution of its sand body is special
Sign calculates oil and gas reserves, development plan formulation is all of great significance.
Domestic and foreign scholars are special from lithology, vertical sequences and log to the identification in underground ancient times river and its main sand body
Sign etc. is largely summarized excessively, but is limited by geological knowledge, data and technology, does not form the complete knowledge of system so far
The methods and techniques of other subterranean river type and its main sand body are constrained to the accurate exploration of wherein oil gas and Efficient Development.
Invention content
It describes to determine the binary in river vertical sequences based on core observation in view of the above-mentioned problems, the present invention provides a kind of
Structural development degree accurately identifies river class in conjunction with mechanical analysis of rock data and the probability cumulative grain size curves of drafting synthesis
Type.
The present invention uses technical solution below：
A method of identification underground ancient times river pattern, wherein river pattern are braided stream, meandering stream, divide distributary or net
The determination in shape river, each river pattern includes the following steps：
(1) river pattern is judged using the diadactic structure development degree in river vertical sequences：
The vertical stacked binary constituted in river vertical sequences of top layer deposition and layer deposition in river vertical sequences
Structure, wherein the hypomere of vertical deposition sequence is bottom lag deposit and point bar (channel sand dam) deposition group of riverbed parfacies
At the lower part sequence of composition fluvial deposit sequence, referred to as layer deposition；The epimere of sedimentary sequence overflows parfacies by embankment parfacies and river
Composition, mainly a large amount of fine suspension substance (mud stone or siltstone) is in flooding period vertical accretion as a result, constituting river
The top sequence of sedimentary sequence, referred to as top layer deposition；
If layer deposition is close with top layer deposition thickness or the former is slightly less than the latter, which is to divide distributary or song
Flow river；
If layer deposition thickness is much larger than top layer deposition thickness, i.e. sand packet mud, then the ancient times river is braided stream；
If layer deposition thickness is significantly less than top layer deposition thickness, i.e. mud drum sand, then the ancient times river is braided river；
(2) river pattern is judged using mechanical analysis of rock data：
The percentage composition that particle diameter in each size sample is less than 0.074mm components is counted, it is public according to Schumm experiences
Formula：
F=255*M-1.08 (1)
P=3.5*F-0.27 (2)
In formula, F is breadth depth ratio (ratio of flow width and river depth), dimensionless；M is less than for particle diameter
The percentage composition of the component of 0.074mm, dimensionless；P is river curvature, dimensionless；
If breadth depth ratio is more than 20, curvature is less than 1.5, then the ancient times river belongs to low-sinuosity river stream, i.e. braided stream；
If breadth depth ratio is less than 20, curvature is more than 1.5, then the ancient times river is high camber river, to divide distributary, meander
One kind in river, braided river；
(3) probability cumulative grain size curves drawn using Granularity material judge river pattern：
The fluid type point of probability cumulative grain size curves reflection has " gravity flow pattern ", " mixed type (transiens) " and " (standard)
Draw flow pattern " three categories；Wherein, according to the tracing pattern of probability cumulative grain size curves, " gravity flow pattern " curve is divided into " arch arc
Shape " and " simple one section floated " two subclass, " mixed type " curve are divided into " low slope two-part or multisection type " and " tool transition
Two subclass of the two-part of section ", " traction flow pattern " curve are divided into " two-part " and " three-stage " two subclass；
When for braided stream, seeing in the anti-grain sequence of braided stream and positive grain sequence sandstone interval has a large amount of " gravity flow pattern " grain
Probability cumulative curve is spent, percentage is more than 50%；
When to divide distributary, divides in the anti-grain sequence sandstone interval of distributary and sees there are " gravity flow pattern " probability cumulative grain size curves,
But in positive grain sequence sandstone interval based on development " two-part of tool changeover portion ", percentage is more than 50%；
When for meandering stream, see there are " gravity flow pattern " probability cumulative grain size curves in the anti-grain sequence sandstone interval of meandering stream,
But major developmental " two-part " and " three-stage " probability cumulative grain size curves in positive grain sequence sandstone interval, and the two percentage
More than 70%；
All kinds of Grain size probability curves are as shown in Figure 1.
(4) it is carried out taking intersection according to the judging result of step (1) to (3), it is comprehensive to show that accurate river pattern judges.
According to judging that the river pattern obtained can also judge the main sand body of each river pattern.
Carry out core observation and the description of cored interval, record rock type (conglomerate, sandstone, siltstone, mud stone), stratification
Type (common are that parallel bedding, plate cross bedding, trough cross-stratification, climb ripple cross-bedding, horizontal bedding, block
Shape stratification and graded bedding) and vertical sequences (" diadactic structure " development degree).Summarize the well logging of the main sand body in all types of rivers
Response characteristic, and establish corresponding log response template, river pattern for judging non-cored interval and non-core hole and its
The main Sandbody Types of development.
Wherein, rock type：It is mainly clastic rock in fluvial deposit, clastic rock is passed through by the detrital material that parent rock breaks up
The rock formed after mechanical handing, deposition, diagenesis.It can be further divided into according to the diameter (granularity) of detrital grain
Gravel, sand, flour sand and mud, are shown in Table 1.
1 common detrital grain grading table of table
Conglomerate refers to the clastic rock that detrital grain content of the diameter more than 2mm is more than 50%, mainly appears on fluvial deposit
Bottom.Sandstone refers to that the detrital grain content of a diameter of 0.1~2mm is more than 50% clastic rock.Siltstone refers to that particle is straight
The detrital grain content of 0.005~0.1mm of diameter is more than 50% clastic rock.Mud stone refers to the clast that diameter is less than 0.005mm
Grain content is more than 50% clastic rock.
Common three-level nomenclature further divides clastic rock：
(1) grade with content more than 50% determines the basic name of rock；Content is between 25%~50% grade to describe
The form of word " XX matter " writes on before basic name；Grade of the content between 10%~25% is as secondary adjective, " to contain
The form of XX " writes on foremost；Grade of the content less than 10% is not reflected in the title of rock generally.
(2) if the content of no one of clastic rock grade is more than 50%, and content is in 25%~50% grade
More than one, the grade for being then at this moment 25%~50% with content are carried out compound name, are indicated, contained in the form of " XX-XX rocks "
Measure more write below.Other poor grades are handled by first principle.
(3) if being not only more than 50% grade in clastic rock without content, and the grade that content is 25%~50%
Without or only there are one, then whole granularity components of this rock should respectively be merged into three big grade of gravel, sand and flour sand, then pressed again
Preceding two principle name.
Stratification type：Stratification is a kind of bedded structure that rock property vertically changes, and can pass through mineralogical composition, particle
Diameter, the mutation of color or gradual change and display.Lamina is to form the most basic unit of stratification, and thickness is several millimeters to several lis
Rice；Series of strata are made of the similar similar lamina of the origin cause of formation and form, are the metastable results of hydrodynamic condition in a period of time；Layer
Be group has the series of strata superimposition of genetic relationship to be formed by two or more.Common stratification type has parallel layers in fluvial deposit
Reason, horizontal bedding, plate cross bedding, trough cross-stratification, cross-bedding of climbing, blocky stratification and graded bedding.It is vertical or
Parallel to the flow direction stratification profile morphology is as shown in Figure 2.
Parallel bedding is plane with its lamina of horizontal bedding and series of strata interface, and is mutually parallel to each other；It is wherein parallel
In the sandstone of stratification development, formed under strong hydrodynamic condition；Horizontal bedding is developed in the thinner siltstone of particle diameter and mud
In rock, reflect the weak even hydrostatic condition of hydrodynamic condition.The lamina of plate cross bedding is diagonal to series of strata interface, and series of strata circle
Face is the plane being mutually parallel.The lamina oblique of trough cross-stratification and series of strata interface, series of strata bottom circle are flute profile wash surface, lamina
It is cut at top.Essentially homogenous appearance is presented in blocky stratification, does not have the stratification of any laminated structure.Graded bedding is with particle
The vertical variations of diameter are characterized, on the contrary then be anti-grain sequence for positive grain sequence if particle " lower thick upper thin ".It climbs cross-bedding
Formation reflect suspension load (particle of suspension transport) and bottom load (rolled along riverbed bottom or the particle of saltation)
Proportionate relationship, as suspension load be more than bottom load when, formed current bedding；If the ratio of suspension load and bottom load is bordering on phase
Deng then being formed and climbed cross-bedding；If bottom load is more than suspension load, hummocky cross stratification (HCS) is formed.
Determine develop river pattern on the basis of, according to the On The Sedimentary Facies Marks such as the rock type of development, stratification type into
One step judges the main Sandbody Types of development.
A method of the main sand body in identification underground ancient times river summarizes the log response of the main sand body in all types of rivers
Feature, establishes corresponding log, and the log is spontaneous potential curve SP or gamma ray curve GR, wherein
Shale is less in rock or granularity is thicker, SP or GR curves are higher further away from shale line, i.e. amplitude, reflects water body
Energy is higher；If curve lower part amplitude is high and is contacted with the mutation of curve below, upward profile amplitude continuously decreases, and is finally attributed to
Or the bell or box-shaped close to shale line, then it is the positive grain sequence deposition of lower thick upper thin in fluvial facies, then is river in dividing distributary
Be in point bar, braided stream in road Sha Ba, meandering stream it is channel bar sand body；If curve lower part amplitude is small, upward amplitude increase is in funnel
Shape is then lower thin and upper thick anti-grain sequence flood fan sand body；
SP or GR curves are that lower part amplitude is small, and the upward increased infundibulate of amplitude is then the lower thin and upper thick anti-grain of flood fan
Sequence；
SP or GR curves are lower curve amplitude height and are contacted with the mutation of curve below that upward profile amplitude gradually drops
It is low, be finally attributed to or close to shale line bell or box-shaped, then in fluvial facies for lower thick upper thin positive grain sequence deposit.
The invention has the advantages that：
It provides a kind of based on core observation description, grain size parameter analysis, probability cumulative grain size curves classification and log
The method of feature recognition underground ancient times river pattern and its main sand body.This method is retouched by the fine core observation of cored interval
It states, in conjunction with grain size analysis data, probability cumulative grain size curves and features of logging curve, to cored interval river pattern and its master
It wants sand body to be identified, and summarizes the features of logging curve of each main sand body of river type, establish corresponding log response template,
The ancient times river pattern and its main sand body of non-cored interval and non-core hole are identified.This method operability is stronger,
It can effectively identify the river pattern of underground development and its main sand body, the Distribution Characteristics for accurate description and prediction fluvial sandbody carry
Geological model is supplied, developing oil gas therein for Efficient Exploration provides geologic basis.
Description of the drawings
Fig. 1 is all kinds of probability cumulative grain size curves features.
Wherein, (a) is gravity stream type probability cumulative grain size curves；(b) it is mixed type probability cumulative grain size curves；(c) it is
Draw flow pattern probability cumulative grain size curves.
Fig. 2 is Transverse to the flow direction stratification profile morphology figure.
Fig. 3 is intact in coring section rock core, and the flow chart of river pattern is judged under the conditions of vertical sequence is complete.
Fig. 4 is that the flow chart of river pattern is judged under the conditions of vertical sequence is incomplete in coring section disintegration of core.
Fig. 5 is to divide distributary main sand body logging response character.
Specific implementation mode
The present invention is specifically described below in conjunction with the accompanying drawings：
In conjunction with Fig. 1 to Fig. 5, a method of identification underground ancient times river pattern, wherein river pattern are braided stream, meander
River divides distributary or braided river, the determination of each river pattern to include the following steps：
(1) river pattern is judged using the diadactic structure development degree in river vertical sequences：
The vertical stacked binary constituted in river vertical sequences of top layer deposition and layer deposition in river vertical sequences
Structure, wherein the hypomere of vertical deposition sequence is bottom lag deposit and point bar (channel sand dam) deposition group of riverbed parfacies
At the lower part sequence of composition fluvial deposit sequence, referred to as layer deposition；The epimere of sedimentary sequence overflows parfacies by embankment parfacies and river
Composition, mainly a large amount of fine suspension substance (mud stone or siltstone) is in flooding period vertical accretion as a result, constituting river
The top sequence of sedimentary sequence, referred to as top layer deposition；
If layer deposition is close with top layer deposition thickness or the former is slightly less than the latter, which is to divide distributary or song
Flow river；
If layer deposition thickness is much larger than top layer deposition thickness, i.e. sand packet mud, then the ancient times river is braided stream；
If layer deposition thickness is significantly less than top layer deposition thickness, i.e. mud drum sand, then the ancient times river is braided river；
(2) river pattern is judged using mechanical analysis of rock data：
The percentage composition that particle diameter in each size sample is less than 0.074mm components is counted, it is public according to Schumm experiences
Formula：
F=255*M-1.08 (1)
P=3.5*F-0.27 (2)
In formula, F is breadth depth ratio (ratio of flow width and river depth), dimensionless；M is less than for particle diameter
The percentage composition of the component of 0.074mm, dimensionless；P is river curvature, dimensionless；
If breadth depth ratio is more than 20, curvature is less than 1.5, then the ancient times river belongs to low-sinuosity river stream, i.e. braided stream；
If breadth depth ratio is less than 20, curvature is more than 1.5, then the ancient times river is high camber river, to divide distributary, meander
One kind in river, braided river；
(3) probability cumulative grain size curves drawn using Granularity material judge river pattern：
The fluid type point of probability cumulative grain size curves reflection has " gravity flow pattern ", " mixed type (transiens) " and " (standard)
Draw flow pattern " three categories；Wherein, according to the tracing pattern of probability cumulative grain size curves, " gravity flow pattern " curve is divided into " arch arc
Shape " and " simple one section floated " two subclass, " mixed type " curve are divided into " low slope two-part or multisection type " and " tool transition
Two subclass of the two-part of section ", " traction flow pattern " curve are divided into " two-part " and " three-stage " two subclass；
When for braided stream, seeing in the anti-grain sequence of braided stream and positive grain sequence sandstone interval has a large amount of " gravity flow pattern " grain
Probability cumulative curve is spent, percentage is more than 50%；
When to divide distributary, divides in the anti-grain sequence sandstone interval of distributary and sees there are " gravity flow pattern " probability cumulative grain size curves,
But in positive grain sequence sandstone interval based on development " two-part of tool changeover portion ", percentage is more than 50%；
When for meandering stream, see there are " gravity flow pattern " probability cumulative grain size curves in the anti-grain sequence sandstone interval of meandering stream,
But major developmental " two-part " and " three-stage " probability cumulative grain size curves in positive grain sequence sandstone interval, and the two percentage
More than 70%；
(4) it is carried out taking intersection according to the judging result of step (1) to (3), it is comprehensive to show that accurate river pattern judges.
According to judging that the river pattern obtained can also judge the main sand body of each river pattern.
Carry out core observation and the description of cored interval, record rock type (conglomerate, sandstone, siltstone, mud stone), stratification
Type (common are that parallel bedding, plate cross bedding, trough cross-stratification, climb ripple cross-bedding, horizontal bedding, block
Shape stratification and graded bedding) and vertical sequences (" diadactic structure " development degree).Summarize the main sedimentary micro (sand in all types of rivers
Body) logging response character, and establish corresponding log response template, be used for the sedimentary micro of non-cored interval and non-core hole
The judgement of (sand body)：First according to " diadactic structure " development degree and whether develop anti-grain sequence and tentatively judge underground ancient times river
Type, judge its main Sandbody Types in conjunction with log response template.
On the basis of determining development river pattern, according to depositions such as the rock type of development, stratification type, mud stone colors
Facies marker further judges the main Sandbody Types of development.The lithology of each main sand body of river type, stratification type feature are shown in Table 2~table
5 (bases for estimation).
Table 2 divides distributary main Sand Body Sedimentary Characteristics
The main Sand Body Sedimentary Characteristics of 3 meandering stream of table
The main Sand Body Sedimentary Characteristics of 4 braided stream of table
The main Sand Body Sedimentary Characteristics of 5 braided river of table
The method for identifying the main sand body in underground ancient times river, including summarize the log response of all types of main sand bodies in river
Feature, establishes corresponding log, and log is spontaneous potential curve SP or gamma ray curve GR, wherein
Shale is less in rock or granularity is thicker, SP or GR curves are higher further away from shale line, i.e. amplitude, reflects water body
Energy is higher；If curve lower part amplitude is high and is contacted with the mutation of curve below, upward profile amplitude continuously decreases, and is finally attributed to
Or the bell or box-shaped close to shale line, then it is the positive grain sequence deposition of lower thick upper thin in fluvial facies, then is river in dividing distributary
Be in point bar, braided stream in road Sha Ba, meandering stream it is channel bar sand body；If curve lower part amplitude is small, upward amplitude increase is in funnel
Shape is then lower thin and upper thick anti-grain sequence flood fan sand body；
SP or GR curves are that lower part amplitude is small, and the upward increased infundibulate of amplitude is then the lower thin and upper thick anti-grain of flood fan
Sequence；
SP or GR curves are lower curve amplitude height and are contacted with the mutation of curve below that upward profile amplitude gradually drops
It is low, be finally attributed to or close to shale line bell or box-shaped, then in fluvial facies for lower thick upper thin positive grain sequence deposit.
Wherein, differentiate that cored interval river pattern (carries out, i.e., on the basis of determination has been fluvial deposit：Vertical layer
Sequence is generally represented as the deposition characteristics of " lower thick upper thin ", based on clastic deposited sediments, is formed under the conditions of development unimodal current
Plate cross bedding and trough cross-stratification, agensis reflect that exposure, oxygen-enriched item often occur in the cross-bedding of bimodal current, mud stone
Yellow, the red formed under part.) quick-reading flow sheets it is as follows：
(1) coring section rock core is intact, and vertical sequence is complete.Judge that the flow chart of river pattern is shown in figure under this condition
Shown in 2.
(2) coring section disintegration of core, vertical sequence are imperfect.Judge that the flow chart of river pattern is shown in Fig. 3 under this condition
It is shown.
For dividing distributary, on the basis of having determined as point distributary deposition, the well logging for dividing the main sand body of distributary is summarized
Response characteristic (table 2) establishes the log response template (as shown in Figure 5) for dividing each sedimentary micro of distributary (main sand body), for non-
The judgement of cored interval and the sedimentary micro (sand body) of non-core hole.
If a certain coring section principal lithologic is medium-fine sand rock, packsand, Extra-fine sand rock (positive grain sequence) are gradually become upwards, are had
Plate cross bedding, parallel bedding, level/parallel bedding, and SP or GR curves are in the bell or box-shaped of high-amplitude, then the coring section
For riverbed parfacies channel sand dam microfacies (sand body).
If lithology has anti-grain sequence thicker upwards or the upwards thicker compound grain sequence to attenuate again based on packsand,
It is then flood fan microfacies (sand body).
If sedimentary sequence lower part is lithology, relatively thick and medium-fine sand rock with various cross-beddings deposits, and top sports rock
Property thinner mud stone, siltstone deposition, then be abandoned channel parfacies (sand body) deposition.
Certainly, above description is not limitation of the present invention, and the present invention is also not limited to the example above, this technology neck
The variations, modifications, additions or substitutions that the technical staff in domain is made in the essential scope of the present invention should also belong to the present invention's
Protection domain.
Claims (1)
1. a kind of method of identification underground ancient times river pattern, wherein river pattern are braided stream, meandering stream, divide distributary or netted
River, which is characterized in that the determination of each river pattern includes the following steps：
(1) river pattern is judged using the diadactic structure development degree in river vertical sequences：
1. establishing the binary-structure model in river vertical sequences：
Binary-structure model refers to be made of vertical be stacked of top layer deposition and layer deposition in river vertical sequences, wherein is hung down
It is generally channel sand to the bottom lag deposit and point bar deposit composition, the point bar that the hypomere of sedimentary sequence is riverbed parfacies
Dam constitutes the lower part sequence of fluvial deposit sequence, is layer deposition；The epimere of sedimentary sequence overflows parfacies group by embankment parfacies and river
At mainly a large amount of fine suspension substance is in flooding period vertical accretion as a result, the fine suspension substance is generally mud stone
Or siltstone, the top sequence of fluvial deposit sequence is constituted, is top layer deposition；
2. judging river pattern using binary-structure model：
If layer deposition is close with top layer deposition thickness or the former is slightly less than the latter, which is to divide distributary or meander
River；
If layer deposition thickness is much larger than top layer deposition thickness, i.e. sand packet mud, then the ancient times river is braided stream；
If layer deposition thickness is significantly less than top layer deposition thickness, i.e. mud drum sand, then the ancient times river is braided river；
(2) river pattern is judged using mechanical analysis of rock data：
The percentage composition that particle diameter in each size sample is less than 0.074mm components is counted, according to Schumm empirical equations：
F=255*M-1.08 (1)
P=3.5*F-0.27 (2)
In formula, F is breadth depth ratio, i.e. the ratio of flow width and river depth, dimensionless；M is particle diameter less than 0.074mm's
The percentage composition of component, dimensionless；P is river curvature, dimensionless；
If breadth depth ratio is more than 20, curvature is less than 1.5, then the ancient times river belongs to low-sinuosity river stream, i.e. braided stream；
If breadth depth ratio is less than 20, curvature is more than 1.5, then the ancient times river is high camber river, to divide distributary, meandering stream, net
One kind of shape korneforos；
(3) probability cumulative grain size curves drawn using Granularity material judge river pattern：
The fluid type of probability cumulative grain size curves reflection is divided into A types probability cumulative grain size curves, Type B probability cumulative grain size curves
With c-type probability cumulative grain size curves；Wherein, the A types probability cumulative grain size curves are " gravity flow pattern ", and the Type B granularity is general
Rate accumulation curve is " mixed type ", and also referred to as " transiens ", the c-type probability cumulative grain size curves are " traction flow pattern ", also referred to as
Make " quasi- traction flow pattern "；
According to the tracing pattern of probability cumulative grain size curves, A type probability cumulative grain size curves are divided into A1 types, A2 types and three, A3 types
Subclass, Type B probability cumulative grain size curves are divided into B1 types, and c-type probability cumulative grain size curves are divided into three C1 types, C2 types and C3 types Asias
Class；Wherein, A1 types are " upper curved arch ", and A2 types are " curved arch in approximation ", and A3 types are " simple one section floated ", and B1 types are
" low slope two-part or multisection type ", C1 types are " two-part of tool changeover portion ", and C2 types are " two-part ", and C3 types are " three sections
Formula "；
When for braided stream, seeing in the anti-grain sequence of braided stream and positive grain sequence sandstone interval has a large amount of A types grain size probability to accumulate
Curve, percentage are more than 50%；
When to divide distributary, divide in the anti-grain sequence sandstone interval of distributary and see there are A type probability cumulative grain size curves, but positive grain sequence sandstone
To develop based on C1 types in interval, percentage is more than 50%；
When for meandering stream, see there are A type probability cumulative grain size curves in the anti-grain sequence sandstone interval of meandering stream, but positive grain sequence sandstone
Major developmental C2 types and C3 type probability cumulative grain size curves in interval, and the two percentage is more than 70%；
(4) it is carried out taking intersection according to the judging result of step (1) to (3), it is comprehensive to show that accurate river pattern judges.
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