CN1944956A - Fluvial phase sand building structure identifying method - Google Patents
Fluvial phase sand building structure identifying method Download PDFInfo
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- CN1944956A CN1944956A CN 200610150967 CN200610150967A CN1944956A CN 1944956 A CN1944956 A CN 1944956A CN 200610150967 CN200610150967 CN 200610150967 CN 200610150967 A CN200610150967 A CN 200610150967A CN 1944956 A CN1944956 A CN 1944956A
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Abstract
The flurial phase sand building structure identifying method belongs to the field of petroleum extracting technology and aims at solving the complicated plane problem in extracting oil from the oil field in high water content period and even very high water content period. The flurial phase sand building structure identifying method includes: 1. identifying single channel sand; 2. identifying seepage barrier in single channel sand; and 3. identifying micro seepage barrier in single channel sand. The present invention has the features of wide application range, easy application, high precision, high practicability, etc.
Description
Technical field
The invention belongs to the oilfield exploitation technical field.
Background technology
The main purpose of fluvial phase sand building structure identification is to disclose macroscopical heterogeneous body of fluvial deposit sand body, for oil field development provides geologic basis.The sand body structure of fluvial deposit has level, and the level of identification is dark more, and the heterogeneous body problem of solution is concrete more, also can obtain better effect in the application that exploitation is adjusted.
Originally Shi Bie sand body building structure, mainly divide on the basis and get the sedimentary micro characteristic distributions clear in sedimentation unit, river course complex and the distribution of distributary channel sand body origin cause of formation microfacies on the plane have been disclosed, can only solve ground, oil field next part horizontal contradiction, can't resolve for the horizontal contradiction of difficulty and the contradiction of sedimentary micro sand body inside.Enter the ultra-high water-containing after date in the oil field, remaining oil distribution is more scattered, and in order effectively to excavate remaining oil, original reservoir description technique can not satisfy the production needs of oil field late high water content period.
Original technical work method is:
------------setting up sedimentation model---the oil field development production application of judging the separate of sedimentation unit sand body of setting up sedimentation unit boundary storehouse of on former substratum basis, segmenting sedimentation unit by drawing the sand body flat distribution map to the sand body boundary layer of uniting.
There is following shortcoming in original technology:
Original technology can disclose the planar distribution of sandbody microfacies, can only solve general horizontal contradiction; Do not determine the border for Planar Compound river channel sand inside, can not disclose the characteristic distributions of single sand body deeply, can't resolve complicated plane problem; Can not disclose the architectural feature of sand body inside, remaining oil in the tap layer is not had directive function.
Poor practicability: the oil field enters the ultra-high water-containing after date, thick sand body for fluvial deposit, interlayer contradiction is transferred on plane, the interior contradiction of layer, remaining oil distribution is very scattered, for satisfying the steady oil control in ultra-high water cut stage oil field water, the low development requirement that drops into high production, need the pre-accurately distribution position of detecting residual oil between well, for the remaining oil distribution characteristics of complexity, can not disclose out, poor to the operation instruction effect.
Summary of the invention
Subject matter at late high water content period and even ultra-high water cut stage oil field development, solve original technology and can only solve general horizontal contradiction, can't resolve complicated plane problem, poor practicability, need deeply discern the reservoir description technique, the present invention proposes a kind of fluvial phase sand building structure identifying method, concrete scheme is as follows for this reason:
One, the identification of monotonous fluvial channel body:
Based on the log under the dense well pattern condition, adopt the basic prosodic features of cycle contrast and the vertical sequence of genetic model to analyze the method that combines on the cross-hole section, the border of monotonous fluvial channel body is discerned; In conjunction with all kinds of depositional model origin cause of formation characteristic distributions, carry out the plane combination, divide the profile of monotonous fluvial channel body, finish the identification on each monotonous fluvial channel body border;
Two, the identification of the seepage flow barrier between the monotonous fluvial channel body:
Determine the vertical interface type standard of monotonous fluvial channel body, discern vertical barrier and distribute, be i.e. vertical permeability＜0.1 μ m
2As Rule of judgment; Determine monotonous fluvial channel body planar interface type standard, identification monotonous fluvial channel body plane barrier distributes, and is two kinds on lithology saltant, the mud stone type of sand body.
Three, the microscopic seepage barrier of monotonous fluvial channel body inside identification:
The interlayer of monotonous fluvial channel body inside is adopted the contrast of reviewing based on horizontal well array, each adjacent row carries out comprehensive comparative analysis, determine the lithology type of sand body intraformational bed, analyze varied in thickness, distribution or the scale of the interlayer of describing sand body inside.
The present invention has following characteristics:
First: propose the mentality of designing of fluvial facies building structure identification first, this is unprecedented concrete scheme in the reservoir description technique.
Second: in this technology identifying, proposed the identification content of three broad aspect simultaneously.
The 3rd: the single sand body description technique is the comprehensive of theory and practice method, compare with former method, improved the description precision of sand body spread, improved the precision of prediction in remaining oil enrichment district, sum up the method for taping the latent power accordingly at dissimilar remaining oils, effectively improve the final recovery percent of reserves of sand body.
The the 4th: widely applicable.The fluvial phase sand building structure identifying method scope of application obviously enlarges.At different depositional model sand bodies, different anatomic methods is proposed.
The 5th: theoretical property is strong, operation is convenient to grasp.With the injection-production well group is unit, analyzes that retrospective interlayer blocks effect between injection-production well, the number of fixed structure unit not, and concrete well layer concrete analysis, not only flexibly but also practical.
The 6th: systematicness is strong.Discerned the distribution at Pyatyi interface between sedimentation unit, its four, three grades of interfaces, inside, to the analysis of sand body structure to the degree that again can not segment (according to present well logging resolution ratio).
The the 7th: the precision height.Meticulous sedimentation unit inside four, tertiary structure interface and the sand body structure of being separated thereof.
The the 8th: practical.Adopt dynamically developing history of direction, combination by injection-production relation, notes, analysis, residual oil distribution predicting position, analysis remaining oil type and the suitable method of taping the latent power thereof, from the origin cause of formation of remaining oil, position to the mode of taping the latent power, not only effectively raise the precision of remaining oil prediction, also opened up the effective way of the renewal of remaining oil analysis.
Description of drawings
Fig. 1 is the identification achievement exemplary view of monotonous fluvial channel body.
The specific embodiment
The specific embodiment one: the fluvial phase sand building structure identifying method one of present embodiment is the recognition technology that will discern the interior monotonous fluvial channel body of compound river channel sand on the plane; The 2nd, discern the seepage flow barrier between the monotonous fluvial channel body, promptly discern the plane the seepage flow barrier and vertical on the seepage flow barrier; The 3rd, discern the microscopic seepage barrier of monotonous fluvial channel body inside, mainly refer to interlayer and interlayer characteristic distributions.Concrete technical scheme is:
1, the recognition technology schematic design of monotonous fluvial channel body
Based on the log under the dense well pattern condition, adopt cycle contrast and genetic model (three kinds of pigtail shape formulas, meander formula, the straight formula) method that the basic prosodic features analysis of vertical sequence combines on the cross-hole section, carry out the border of monotonous fluvial channel body is discerned.As vertical border, consider the feature of sand body sudden change, gradual change with shale layer, caliche, shale silt layer, in conjunction with all kinds of depositional model origin cause of formation characteristic distributions, the vertical border that emphasis is got ribbon, non-ribbon river channel sand clear distributes.Carrying out the plane combination then, still is foundation with the depositional model, divides the profile of monotonous fluvial channel body, finishes the identification (Fig. 1) on each monotonous fluvial channel body border.
2, the seepage flow barrier schematic design between the monotonous fluvial channel body
The contact relation vertical to monotonous fluvial channel body settles the standard, and discerns vertical barrier and distributes, be i.e. vertical permeability＜0.1 μ m
2As Rule of judgment; Contact relation to the monotonous fluvial channel body plane settles the standard, promptly independent laminated devices, superimposed type and cut three kinds on folded type; Identification monotonous fluvial channel body plane barrier distributes, and is two kinds on lithology saltant, the mud stone type of sand body.
3, the microscopic seepage barrier schematic design of monotonous fluvial channel body inside
The contrast of reviewing based on horizontal well array; each adjacent row will carry out comprehensive comparative analysis; discern the distribution scale or the expanded range size of the interlayer (mud, calcium, powder mud, 4 kinds of lithology interlayers of mud powder) of monotonous fluvial channel body inside, mainly discern lithologic properties, thickness size, the plane distributing scope of interlayer.
By thinking design to above-mentioned three schemes, after finishing the achievement map,, carry out remaining oil prediction in conjunction with the oil field multidate information, finally be to provide technical support for instructing remaining oil to tap the latent power.
Workflow:
One, monotonous fluvial channel body is discerned workflow: according to the principle of cycle contrast, grading control, carry out vertical boundary identification, the division of single river channel sand and---set up the unit and push up limit data storehouse, boundary---the separate attribute (river channel sand, sheet sand body, off-balancesheet sand body, mud stone) of judgement sand body---sand body description that the generation base map---is drawn result map---.
Two,---the vertical interface identification of single river channel sand---is set up the vertical interface data of single river channel sand storehouse (layer position, interface type, dark, four fields of thickness in top)---drawing the flat distribution map at vertical interface between the vertical adjacent river channel sand---seepage flow barrier description between monotonous fluvial channel body to the identification of the seepage flow barrier between monotonous fluvial channel body workflow: the vertical interface type standard formulation of single river channel sand (dividing four kinds: mud, calcium, powder mud, 4 kinds of lithology interlayers of mud powder).
Three, the microscopic seepage barrier identification workflow of monotonous fluvial channel body inside: single river channel is numbered---the interlayer to each monotonous fluvial channel body inside is reviewed contrast, numbering---the lithology type of determining the sand body intraformational bed (is divided four kinds: mud, 2 kinds of interlayers of mud powder)---set up interlayer database (the layer position of sand body inside, interface type, the top is dark, four fields of thickness)---utilizing the characteristic distributions of PETREL software simulation intraformational bed---analyzes the varied in thickness of the interlayer of describing sand body inside, distribution or scale.
Four, apply workflow (additional flow process) in the oil field development: utilize above-mentioned identification achievement,---well pattern characteristic analysis (anti-9 methods, matrix method, five-spot)---the well spacing size is analyzed, and------------establishment adjustment scheme---is implemented the adjustment scheme---, and sum up in the cementing quality analysis in the construction summarize analysis in the intake profile analysis of well by effect under the straticulate exploration of analysis purpose layer (which interval the main target zone of analyzing exploitation is).
The specific embodiment two: with the Daqing oil field is example, by from 2004 in June, 2006, accumulative total is dissected the sand body structure of layer surplus 3296 section 18628 wells of 648 well groups times 700,000, predicted the remaining oil enrichment position more accurately, at dissimilar remaining oils, injection well, producing well are taked control measures respectively, obtain obvious effects.Implementation result is an example with the first half of the year in 2006 only:
Utilize the blocking property of stablizing the distribution interlayer in the sand body, carry out subdivision injection in the layer, improve the development degree of low-permeability layer.
30 mouthfuls of wells of subdivision injection scheme in establishment altogether, the enforcement thick oil pay, 42 intervals of shutoff, wherein high infiltration position shutoff sandstone 168.2m, effective 146.4m, day water filling reduces 1680m
3, water filling sandstone thickness 500.9m is strengthened at the hyposmosis position, effective thickness 315.9m, and day water filling increases 1390m
317 mouthfuls of well intake profile data of segmentation in the statistics layer, hyposmosis position sandstone and effective thickness suction ratio increase by 8.29% and 8.91% respectively; Oil well was imitated in 18 mouthfuls of no measures around early 10 mouthfuls of segmentation wells were implemented in contrast, segmentation back day production fluid 1589t, and day produce oil 74t, comprehensive water cut 95.33% and is compared before the segmentation, and day production fluid reduces 49t, and day produce oil increases 7t, 0.61 percentage point of moisture decline.
According to different origins sand body design feature, adjust the water filling interval, same element of construction sand body is combined in the interval, reduce invalid water filling, interlayer interference, improve water-injection efficiency.
49 mouthfuls of wells of reorganization scheme are segmented in establishment altogether, and day injection allocation reduces 840m
3, day real a notes reduced 806m
3
Utilize the effect of blocking of structural interface, the height of shutoff sand body inside oozes the position, invalid circulation in the control producing well layer.
8 mouthfuls of well effects from having implemented have obtained tangible oil increasing precipitation effect, average individual well of the initial stage liquid 21t that increases day by day, the oily 6.5t that increases day by day, 5.7 percentage points of moisture declines.
According to the remaining oil type, take the different methods of taping the latent power:
Adopt the remaining oil that imperfection forms because of the sand body plane heterogeneity causes annotating, dwindle the injection-production relation of well spacing perfect frame unit, layer interior remaining oil of taping the latent power by different series of strata oil-water well perforations addings.
Implement 22 mouthfuls of wells altogether, the initial stage liquid 687t that increases day by day, the oily 133t that increases day by day, 6.8 percentage points of water cut decreases.
Because of blocking of structural interface causes layer different sand body of interior producing status, take a layer interior fracturing process, improve the recovery percent of reserves of development degree lower position in the layer, for the relatively poor sand body of the degree of stability at interface, take the artificial interface layer interior remaining oil of taping the latent power.
According to said method implement 8 mouthfuls of wells altogether, the initial stage liquid 262t that increases day by day, the oily 59t that increases day by day, 8.21 percentage points of moisture declines.
Claims (4)
1, a kind of fluvial phase sand building structure identifying method is characterized in that described method is:
One, the identification of monotonous fluvial channel body:
Based on the log under the dense well pattern condition, adopt the basic prosodic features of cycle contrast and the vertical sequence of genetic model to analyze the method that combines on the cross-hole section, the border of monotonous fluvial channel body is discerned; In conjunction with all kinds of depositional model origin cause of formation characteristic distributions, carry out the plane combination, divide the profile of monotonous fluvial channel body, finish the identification on each monotonous fluvial channel body border;
Two, the identification of the seepage flow barrier between the monotonous fluvial channel body:
Determine the vertical interface type standard of monotonous fluvial channel body, discern vertical barrier and distribute, be i.e. vertical permeability＜0.1 μ m
2As Rule of judgment; Determine monotonous fluvial channel body planar interface type standard, identification monotonous fluvial channel body plane barrier distributes, and is two kinds on lithology saltant, the mud stone type of sand body;
Three, the microscopic seepage barrier of monotonous fluvial channel body inside identification:
The interlayer of monotonous fluvial channel body inside is adopted the contrast of reviewing based on horizontal well array, each adjacent row carries out comprehensive comparative analysis, determine the lithology type of sand body intraformational bed, analyze varied in thickness, distribution or the scale of the interlayer of describing sand body inside.
2, fluvial phase sand building structure identifying method according to claim 1 is characterized in that described genetic model is three kinds of pigtail shape formulas, meander formula, straight formula.
3, fluvial phase sand building structure identifying method according to claim 1 is characterized in that the vertical interface type of described monotonous fluvial channel body divides mud, calcium, powder mud, four kinds of lithology interlayers of mud powder.
4, fluvial phase sand building structure identifying method according to claim 1 is characterized in that described monotonous fluvial channel body planar interface type divides independent laminated devices, superimposed type and cut three kinds on folded type.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104251137A (en) * | 2013-06-28 | 2014-12-31 | 中国石油化工股份有限公司 | Interlayer identification prediction method in fluvial facies thick oil layer |
| CN104453877A (en) * | 2014-11-05 | 2015-03-25 | 长江大学 | Underground deep-buried meander point dam sand body historical reconstruction method |
| CN104533402A (en) * | 2014-11-25 | 2015-04-22 | 长江大学 | Multi-phase superimposed combined braided channel sand phase determining method |
| CN105239998A (en) * | 2015-08-21 | 2016-01-13 | 中国海洋石油总公司 | Well distribution method based on offshore oilfield reservoir subdivision |
| CN105275457A (en) * | 2014-06-26 | 2016-01-27 | 中国石油化工股份有限公司 | Deployment optimal mode research method for uncompartmentalized oilfield fluvial facies reservoir horizontal well |
| CN111997604A (en) * | 2020-10-16 | 2020-11-27 | 陕西延长石油（集团）有限责任公司 | Method for identifying single-stage river channel boundary |
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2006
- 2006-10-31 CN CN 200610150967 patent/CN1944956A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104251137A (en) * | 2013-06-28 | 2014-12-31 | 中国石油化工股份有限公司 | Interlayer identification prediction method in fluvial facies thick oil layer |
| CN105275457A (en) * | 2014-06-26 | 2016-01-27 | 中国石油化工股份有限公司 | Deployment optimal mode research method for uncompartmentalized oilfield fluvial facies reservoir horizontal well |
| CN104453877A (en) * | 2014-11-05 | 2015-03-25 | 长江大学 | Underground deep-buried meander point dam sand body historical reconstruction method |
| CN104453877B (en) * | 2014-11-05 | 2018-05-15 | 长江大学 | A kind of buried point bar of meandering sand body history method for reconstructing in underground |
| CN104533402A (en) * | 2014-11-25 | 2015-04-22 | 长江大学 | Multi-phase superimposed combined braided channel sand phase determining method |
| CN104533402B (en) * | 2014-11-25 | 2017-11-14 | 长江大学 | A kind of more phases are stacked compound braided channel sand body and determine method by stages |
| CN105239998A (en) * | 2015-08-21 | 2016-01-13 | 中国海洋石油总公司 | Well distribution method based on offshore oilfield reservoir subdivision |
| CN105239998B (en) * | 2015-08-21 | 2017-12-15 | 中国海洋石油总公司 | A kind of portion's well method based on offshore oilfield subdivision of reservoir |
| CN111997604A (en) * | 2020-10-16 | 2020-11-27 | 陕西延长石油（集团）有限责任公司 | Method for identifying single-stage river channel boundary |
| CN111997604B (en) * | 2020-10-16 | 2023-12-08 | 陕西延长石油（集团）有限责任公司 | Single-stage river boundary identification method |
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