CN110412649A - A kind of recognition methods of list phase distributary channel - Google Patents
A kind of recognition methods of list phase distributary channel Download PDFInfo
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- CN110412649A CN110412649A CN201910523131.0A CN201910523131A CN110412649A CN 110412649 A CN110412649 A CN 110412649A CN 201910523131 A CN201910523131 A CN 201910523131A CN 110412649 A CN110412649 A CN 110412649A
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- 239000004576 sand Substances 0.000 claims abstract description 100
- 230000007480 spreading Effects 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000003550 marker Substances 0.000 claims abstract description 3
- 230000004044 response Effects 0.000 claims description 21
- 238000004088 simulation Methods 0.000 claims description 18
- 239000004575 stone Substances 0.000 claims description 3
- 239000004744 fabric Substances 0.000 claims 1
- 208000035126 Facies Diseases 0.000 abstract description 4
- 239000011435 rock Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/28—Processing seismic data, e.g. for interpretation or for event detection
- G01V1/282—Application of seismic models, synthetic seismograms
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/28—Processing seismic data, e.g. for interpretation or for event detection
- G01V1/30—Analysis
- G01V1/301—Analysis for determining seismic cross-sections or geostructures
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/28—Processing seismic data, e.g. for interpretation or for event detection
- G01V1/30—Analysis
- G01V1/306—Analysis for determining physical properties of the subsurface, e.g. impedance, porosity or attenuation profiles
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/28—Processing seismic data, e.g. for interpretation or for event detection
- G01V1/30—Analysis
- G01V1/307—Analysis for determining seismic attributes, e.g. amplitude, instantaneous phase or frequency, reflection strength or polarity
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Abstract
The present invention relates to a kind of recognition methods of single phase distributary channel.The recognition methods divides the phase time that each well bores chance sand body according to the thickness of target zone distance marker layer the following steps are included: 1) in braid deltas；2) sedimentary micro of the research same period time sand body, analyzes the spreading direction of distributary channel；3) under water on the spreading direction of distributary channel, the contact relation for determining adjacent well sub-channel branch sand body is analyzed by forward modeling, marks off each branch channel；4) boundary for combining seismic properties and seismic inversion prediction sand body, determines the areal extent of each branch channel of list phase distributary channel.The recognition methods of list phase distributary channel provided by the invention, it can determine the areal extent of single each branch channel of phase distributary channel, the clearer spatial variations for showing braided river delta front facies tract lithology and lithofacies of energy, and then technical support can be provided for the exploration and development of complex lithology oil-gas reservoir.
Description
Technical field
The invention belongs to oil exploration and development fields, and in particular to a kind of recognition methods of list phase distributary channel.
Background technique
With the increasingly raising of Songliao basin, the geological object of exploration and development is smaller and smaller, more and more hidden, mainly
For small scale and thin sand body, for these sand bodies since development period is more and belongs to different branch channels, sand body plane is non-
Homogenieity is strong, causes well site deployment difficulty big, the serious exploration and development process for restricting oil-gas reservoir.
At present for the identification of single phase time sub-channel branch sand body, from the side such as its Forming Mechanism, Exploration method
More trial has been done in face, but due to the complexity of single phase sub-channel branch sand body, there is presently no the knowledges for forming complete set
Other technical system, this also affects the effect of complex lithology reservoir exploration and development.
To disclose a kind of delta front distributary channel wide for the Chinese patent application that publication No. is CN106777440A
Spend prediction technique comprising: according to the sedimentary microfacies map of substratum, static state identification distributary channel microfacies；To typical well group into
Mobile state analysis, dynamically divides river of single phase time；Mutually typical well group is identified with rock core information by well logging underwater
Distributary channel is measured, and the quantitative parameter of distributary channel is obtained；Establish river channel sand width and single phase sand thickness
Relationship finds out the quantitative parameters such as width-thickness ratio, establishes regression formula, carries out the prediction of sub-channel branch sand body.The prediction technique
Qualitative description can be carried out to the distribution of distributary channel, and the width in river is quantitatively described, but due to single phase water
The complexity of lower distributary channel, the prediction technique still cannot clearly show the space of each branch channel of distributary channel
Variation.
Summary of the invention
The purpose of the present invention is to provide a kind of recognition methods of single phase distributary channel, cannot to solve existing method
The problem of clearly showing that the spatial variations of each branch channel of distributary channel.
To achieve the above object, the technical solution of the recognition methods of single phase distributary channel of the invention is:
A kind of recognition methods of list phase distributary channel, comprising the following steps:
1) in braid deltas, the phase time that each well bores chance sand body is divided according to the thickness of target zone distance marker layer；
2) sedimentary micro of the research same period time sand body, analyzes the spreading direction of distributary channel；
3) it under water on the spreading direction of distributary channel, is analyzed by forward modeling and determines adjacent well sub-channel branch sand body
Contact relation marks off each branch channel；
The step of analyzing the contact relation for determining adjacent well sub-channel branch sand body by forward modeling are as follows:
The geological model under adjacent well sand body connection situation is established, by forward simulation, seismic response features are shown as together
Phase axis is continuous, analyzes the actual seismic section of adjacent well, if show with the consistent response characteristic of forward simulation, determine adjacent
Well is a Zhi Hedao；
Establish two kind geological models of the adjacent well sand body not under connection situation: 1. sand body not stacked model in the longitudinal direction,
By forward simulation, seismic response features show as discontinuous seismic event；2. the model that sand body is stacked in the longitudinal direction, passes through forward modeling
Simulation, seismic response features show as lineups and are distorted；The actual seismic section of adjacent well is analyzed, if response characteristic shows
It is distorted for discontinuous seismic event or lineups, then determines that adjacent well is two rivers；
4) boundary for combining seismic properties and seismic inversion prediction sand body, determines each branch channel of list phase distributary channel
Areal extent.
The recognition methods of list phase distributary channel provided by the invention, it may be determined that single each branch river of phase distributary channel
The areal extent in road, can the clearer spatial variations for showing braided river delta front facies tract lithology and lithofacies, and then can be with
Exploration and development for complex lithology oil-gas reservoir provides technical support.
Step 1) is that each well bores the cascade correlation process for meeting sand body, and the principle of foundation is the channel deposit of contemporaneity
Object, whens the interface Qi Ding is equal, the thickness of top interface distance reference lamina is answered roughly equal；It is drawn to further increase the sand body phase time
The validity and adaptability divided, it is preferred that in step 1), the phase time for dividing each well and boring chance sand body, refer to selection target zone
On cover mud stone reference lamina carry out flattening, the thickness at the top of the sand top to reference lamina of each well is counted, using the thickness as sand body
Phase time thickness；The phase time thickness of the sand body of adjacent well is respectively h1、h2, h1≥h2, according to (h1-h2) and h1Ratio determine sand body
Whether same phase time is belonged to；If the ratio is greater than 30%, then determine that the sand body of adjacent well belongs to the not same period time；Such as the ratio
No more than 30%, then determine that the sand body of adjacent well belongs to the same phase time.
For the spatial variations for preferably showing braided river delta front facies tract lithology and lithofacies, it is preferred that step 2)
In, the sedimentary micro of the research same period time sand body refers to and marks off the same period time sand body including underwater distributary river in the plane
The sedimentary micro in road, estuary dam and sheet sand.
Detailed description of the invention
Fig. 1 is the flattening correlation of sand bodies figure of the recognition methods embodiment of the single phase distributary channel of the present invention；
Fig. 2 is the forward modeling geology under the sand body connection situation of the recognition methods embodiment of the single phase distributary channel of the present invention
Illustraton of model and forward modeling sectional view；
Fig. 3 is sand body not not being stacked under connection situation of the recognition methods embodiment of the single phase distributary channel of the present invention
Forward modeling geological model figure and forward modeling sectional view；
Fig. 4 be the recognition methods embodiment of the single phase distributary channel of the present invention sand body not under connection situation it is stacked just
Drill geological model figure and forward modeling sectional view；
Fig. 5 is two well actual seismic sections of the recognition methods embodiment of the single phase distributary channel of the present invention；
Fig. 6 is the seismic inversion wave impedance attributed graph of the recognition methods embodiment of the single phase distributary channel of the present invention；
Fig. 7 is the target wellblock sedimentary microfacies map of the recognition methods embodiment of the single phase distributary channel of the present invention.
Specific embodiment
The present invention mainly identifies single phase distributary channel by following principle: in braid deltas,
The river drift of contemporaneity, whens Qi Ding circle is equal, top surface answered away from the thickness of reference lamina it is roughly equal, therefore can be according to thickness
Degree divides each well and bores the phase time for meeting sand body；Then pass through the heavy of the technical research same periods such as core description and electrofacies analysis time sand body
Product microfacies, analyzes the spreading direction of distributary channel；Under water on the spreading direction of distributary channel, is analyzed and determined by forward modeling
The contact relation of adjacent well sub-channel branch sand body marks off each branch channel；Combine seismic properties and earthquake anti-later
The boundary of prediction sand body is drilled, determines the areal extent of each branch channel of list phase distributary channel.
Preferably to reflect spatial of the sand body under connection situation, it is preferred that in step 3), establish adjacent well sand body
Geological model under connection situation refers to and controls Stratigraphic framework using seismic horizon, establishes the Geological Model of same phase sand body connection
Type, two mouthfuls of well target zones are same river under the model.By forward simulation, it is continuous that seismic response features show as lineups,
Analyze adjacent well actual seismic section, if show with the consistent response characteristic of forward simulation, determine adjacent well be one
River.
Preferably to reflect spatial of the sand body under not connection situation, it is preferred that in step 3), establish sand body vertical
The model not being stacked upwards refers to and controls Stratigraphic framework using seismic horizon, establishes what same phase sand body was not stacked in the longitudinal direction
Geological model, two mouthfuls of well target zones are different rivers under the model, and by forward simulation, seismic response features show as lineups
Discontinuously；The model that sand body is stacked in the longitudinal direction is established, refers to and controls Stratigraphic framework using seismic horizon, establish same phase sand body
Geological model stacked in the longitudinal direction, two mouthfuls of well target zones are different rivers under the model, pass through forward simulation, seismic response is special
Sign shows as lineups and is distorted.The actual seismic section for analyzing adjacent well, if response characteristic shows as discontinuous seismic event
Or lineups are distorted, then determine that adjacent well is two rivers.
For the boundary of clearer display sand body, it is preferred that in step 4), the boundary of the prediction sand body refers to basis
The seismic properties of target zone and the amplitude power variation zone sub-sand body boundary of inverting attribute, amplitude show as by force sand body development, vibration
It is weak to show as sand body agensis.
Embodiments of the present invention are described further combined with specific embodiments below.
The specific embodiment of the recognition methods of single phase distributary channel of the invention, using following steps:
1) it divides each well to bore the phase time for meeting sand body: covering mud stone reference lamina on selection target zone and carry out flattening and carry out fine
Strata Comparison, the thickness of reference lamina top surface is arrived on the sand top (top surface of target zone) for counting each well, using the thickness as the phase of sand body
The phase time thickness of secondary thickness, the sand body of adjacent well is respectively h1、h2, h1≥h2, according to (h1-h2) and h1Ratio determine sand body be
It is no to belong to the same phase time；If the ratio is greater than 30%, then determine that the sand body of adjacent well belongs to the not same period time；Not such as the ratio
Greater than 30%, then determine that the sand body of adjacent well belongs to the same phase time.
(SP- natural potential, GR- natural gamma, AC- interval transit time, RT- true formation resistivity), adjacent well in Fig. 1
73-1 well and 88 wells, the thickness at the top of the distance from top reference lamina of target zone is respectively 11 meters, 15 meters, and ratio 26.7% is small
In 30%.The sandstone target zone of the sandstone target zone and 88 wells that can be concluded that 73-1 well belongs to the same phase time, according to said method to this
All adjacent wells in wellblock carry out cascade correlation, and statistics target zone belongs to the well of same phase time.
2) spreading direction of distributary channel is analyzed: on the basis of determining each well sand body phase time, to sand of same phase time
Body marks off the sedimentary micro including distributary channel, estuary dam, sheet sand in the plane, determines in conjunction with Sediment Source
The spreading direction in river.
3) contact relation of the sub-channel branch sand body of each adjacent well is determined, comprising the following steps:
3.1 establish the geological model under adjacent well sand body connection situation, and by forward simulation, seismic response features are shown as
Lineups are continuous；Analyze adjacent well actual seismic section, if show with the consistent response characteristic of forward simulation, determine phase
Offset well is a Zhi Hedao.As shown in Figure 2, pass through the forward simulation function of rock physics forward modeling software (RokDoc software), benefit
With seismic horizon and log, the geological model (dotted line) that sand body is connected to is established with the target zone of 88 wells for 73-1 well, is produced
Raw forward modeling seismic profile lineups are continuous (dotted line under Fig. 2), and two well actual seismic sections as shown in Figure 5 show as same phase
Axis is discontinuous, does not meet with Fig. 2 forward modeling section lineups feature generated, then 73-1 well and 88 well target zones are not belonging to same river
Road.
3.2 establish two kind geological models of the adjacent well sand body not under connection situation:
1. the model that sand body is not stacked in the longitudinal direction, by forward simulation, seismic response features show as lineups and do not connect
It is continuous；As shown in Figure 3, by the forward simulation function of rock physics forward modeling software (RokDoc software), using seismic horizon and
Log establishes the geological model (dotted line) that sand body is not stacked for the target zone of 73-1 well and 88 wells, the forward modeling of generation
It shakes section discontinuous seismic event (dotted line under Fig. 3).
2. the model that sand body is stacked in the longitudinal direction, by forward simulation, seismic response features show as lineups and turn round
It is bent；As indicated on fig. 4, by the forward simulation function of rock physics forward modeling software (RokDoc software), using seismic horizon and
Log establishes the stacked geological model (dotted line) of sand body, the forward modeling earthquake of generation for the target zone of 73-1 well and 88 wells
Section lineups distort (dotted line under Fig. 4).
The actual seismic section for analyzing adjacent well, if response characteristic shows as discontinuous seismic event or lineups are turned round
Song then determines that adjacent well is the opposite contact relation that two rivers and the type according to response characteristic determine sand body, as shown in Figure 5
Two well actual seismic sections show as discontinuous seismic event, with Fig. 3 generate forward modeling section lineups feature be consistent, then
73-1 well is different rivers from 88 well target zones, and sand body is not stacked.
1. 3.3 pairs of all adjacent wells in wellblock are repeated in 2. step, mark off all branch channels.
4) it determines the areal extent of each branch channel: carrying out fine seismic data and explain, seismic properties are extracted, in conjunction with earthquake
Well constrained inversion predicts the boundary of single phase sand body, determines the areal extent of each branch channel of list phase distributary channel, sketches out
Sedimentary micro planar distribution.Changed according to the amplitude power of the seismic properties and inverting attribute of 73-1 well and 88 well target zones and is distinguished
Sand body boundary, amplitude show as by force sand body development, and amplitude is weak to show as sand body agensis, and sand body boundary is shown in dotted line in Fig. 6.
In conjunction with sand body boundary and adjacent well sand body contact relation, sedimentary micro of sketching out (Fig. 7) has determined the spread model of branch channel
It encloses.
By the comparing result of Fig. 6 and Fig. 7 it is found that the planar distribution information and actual well drilled sound state of research area's sedimentary micro
The goodness of fit of data is higher, and the sedimentary micro planar distribution information obtained by embodiment can clearly show distributary channel
Spatial variations, the recognition methods of single phase distributary channel for thus illustrating that embodiment provides can be Sedimentary Micro Facies spread
A strong means are provided, related ends have directive significance to the well site deployment of complex lithology oil-gas reservoir.
Claims (3)
1. a kind of recognition methods of list phase distributary channel, which comprises the following steps:
1) in braid deltas, the phase time that each well bores chance sand body is divided according to the thickness of target zone distance marker layer；
2) sedimentary micro of the research same period time sand body, analyzes the spreading direction of distributary channel；
3) under water on the spreading direction of distributary channel, the contact for determining adjacent well sub-channel branch sand body is analyzed by forward modeling
Relationship marks off each branch channel；
The step of analyzing the contact relation for determining adjacent well sub-channel branch sand body by forward modeling are as follows:
The geological model under adjacent well sand body connection situation is established, by forward simulation, seismic response features show as lineups
Continuously, analyze the actual seismic section of adjacent well, if show with the consistent response characteristic of forward simulation, determine that adjacent well is
One Zhi Hedao；
Establish two kind geological models of the adjacent well sand body not under connection situation: 1. sand body not stacked model in the longitudinal direction passes through
Forward simulation, seismic response features show as discontinuous seismic event；2. the model that sand body is stacked in the longitudinal direction passes through forward modeling mould
Quasi-, seismic response features show as lineups and are distorted；The actual seismic section for analyzing adjacent well, if response characteristic is shown as
Discontinuous seismic event or lineups are distorted, then determine that adjacent well is two rivers；
4) boundary for combining seismic properties and seismic inversion prediction sand body, determines the exhibition of each branch channel of list phase distributary channel
Cloth range.
2. the recognition methods of list phase distributary channel as described in claim 1, which is characterized in that in step 1), described stroke
Divide each well to bore the phase time for meeting sand body, refers to choose and cover mud stone reference lamina progress flattening on target zone, the sand top for counting each well is arrived
Thickness at the top of reference lamina, using the thickness as the phase of sand body time thickness；The phase time thickness of the sand body of adjacent well is respectively h1、h2,
h1≥h2, according to (h1-h2) and h1Ratio determine whether sand body belongs to same phase time；If the ratio is greater than 30%, then determine
The sand body of adjacent well belongs to the not same period time；If the ratio is not more than 30%, then determine that the sand body of adjacent well belongs to the same phase time.
3. the recognition methods of list phase distributary channel as described in claim 1, which is characterized in that described to grind in step 2)
The sedimentary micro for studying carefully the same period time sand body refers to and marks off the same period time sand body including distributary channel, estuary dam in the plane
And the sedimentary micro of sheet sand.
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| CN111624678A (en) * | 2020-07-01 | 2020-09-04 | 长江大学 | Method for dividing high-precision sequence stratum by using concurrent river channel development elevation |
| CN112180467A (en) * | 2020-11-04 | 2021-01-05 | 中国石油化工股份有限公司 | River channel microphase carving method for conglomerate oil reservoir |
| CN112684512A (en) * | 2021-01-05 | 2021-04-20 | 中国石油天然气股份有限公司 | River channel identification method |
| CN112782760A (en) * | 2020-12-11 | 2021-05-11 | 中国海洋石油集团有限公司 | Method for dissecting braided river reservoir structure by using discontinuous boundaries of seismic reservoir |
| CN112904450A (en) * | 2021-01-12 | 2021-06-04 | 中国石油天然气股份有限公司 | River facies sandstone deposition micro-facies identification method |
| CN113536520A (en) * | 2020-04-22 | 2021-10-22 | 中国石油天然气股份有限公司 | Method and device for simulating meandering stream river channel migration |
| CN113721298A (en) * | 2021-05-25 | 2021-11-30 | 中国石油化工股份有限公司 | Reservoir prediction description method for sediment end underwater diversion river channel |
| CN114594526A (en) * | 2020-12-03 | 2022-06-07 | 中国石油化工股份有限公司 | Quantitative evaluation method for inter-well plane connectivity of river facies sand body |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113536520A (en) * | 2020-04-22 | 2021-10-22 | 中国石油天然气股份有限公司 | Method and device for simulating meandering stream river channel migration |
| CN111624678A (en) * | 2020-07-01 | 2020-09-04 | 长江大学 | Method for dividing high-precision sequence stratum by using concurrent river channel development elevation |
| CN112180467A (en) * | 2020-11-04 | 2021-01-05 | 中国石油化工股份有限公司 | River channel microphase carving method for conglomerate oil reservoir |
| CN114594526A (en) * | 2020-12-03 | 2022-06-07 | 中国石油化工股份有限公司 | Quantitative evaluation method for inter-well plane connectivity of river facies sand body |
| CN114594526B (en) * | 2020-12-03 | 2023-07-11 | 中国石油化工股份有限公司 | Quantitative evaluation method for plane connectivity between river-phase sand bodies |
| CN112782760A (en) * | 2020-12-11 | 2021-05-11 | 中国海洋石油集团有限公司 | Method for dissecting braided river reservoir structure by using discontinuous boundaries of seismic reservoir |
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| CN112684512B (en) * | 2021-01-05 | 2023-09-26 | 中国石油天然气股份有限公司 | River channel identification method |
| CN112904450A (en) * | 2021-01-12 | 2021-06-04 | 中国石油天然气股份有限公司 | River facies sandstone deposition micro-facies identification method |
| CN112904450B (en) * | 2021-01-12 | 2023-08-22 | 中国石油天然气股份有限公司 | River facies sandstone deposition facies identification method |
| CN113721298A (en) * | 2021-05-25 | 2021-11-30 | 中国石油化工股份有限公司 | Reservoir prediction description method for sediment end underwater diversion river channel |
| CN113721298B (en) * | 2021-05-25 | 2023-11-03 | 中国石油化工股份有限公司 | Reservoir prediction description method for underwater diversion river channel at deposition end |
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