CN109270245A - A kind of oil-sand SAGD based on lithofacies can employ interval top surface division methods - Google Patents
A kind of oil-sand SAGD based on lithofacies can employ interval top surface division methods Download PDFInfo
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Abstract
The present invention discloses a kind of oil-sand SAGD based on lithofacies altogether can employ interval top surface division methods.Described method includes following steps: counting the mud stone of developed field and the lithofacies thickness and steam spread condition of shale side lamination；Steam spread condition refers to that steam can not be by lithofacies section by lithofacies section or steam；XOY coordinate system is established, X-coordinate indicates steam spread condition, and 1 indicates that steam can indicate that steam can not indicate lithofacies thickness by lithofacies section, Y coordinate by lithofacies section, 2；The lithofacies thickness of mud stone and shale side lamination that statistics obtains and the steam spread condition are projected in XOY coordinate system respectively and obtains data point, connection data point obtains indicatrix；The thickness value section of two sample points along Y coordinate, indicatrix jump indicates the thickness section that lithofacies stop steam to spread completely.The present invention is based on Lithofacies Identification oil-sand SAGD can employ interval top surface, and division result is more objective, fine, and method is specifically easy, reduces human factor, as a result accurately and reliably.
Description
Technical field
The present invention relates to a kind of, and the oil-sand SAGD based on lithofacies can employ interval top surface division methods, belong to oil exploration and open
Send out technical field.
Background technique
Oil-sand is the sticky mixture of sand, water, pitch and clay composition, has high viscosity, high density, high hydrocarbon bit
Point, such unconventional energy resource often use steam assisted gravity drainage (SAGD) method to be exploited, hold in SAGD development process
Vulnerable to the influence every interlayer, to determine the top side location that can employ interval.The lithofacies of oil-sand interval interlayer have mud stone and
Shale side lamination, steam spread condition are while close compared with lithofacies thickness relationship not only with the certain relationship of Lithofacies Types.
The depth that industry unanimously chooses oil-producing well at present can employ the bottom surface of interval as oil-sand SAGD, and division methods are bright
Really；And interval top surface division methods cognitive dissonance can be employed for oil-sand SAGD, lack unified standard, lead to available reserves
Scale cognitive diversity it is big, directly influence reserves quality evaluation, well site deployment and well to development effectiveness.
Summary of the invention
The object of the present invention is to provide a kind of reasonable, accurate, strong operability oil-sand SAGD based on lithofacies to employ
Interval top surface division methods.
Oil-sand SAGD provided by the present invention based on lithofacies can employ interval top surface division methods, include the following steps:
(1) mud stone of developed field and the lithofacies thickness and steam spread condition of shale side lamination are counted；
Need developed field and oil field to be divided that there is similar depositional environment, i.e. the blocking channel type in oil field is mud
Rock and shale side lamination；
The steam spread condition refers to that steam can not be by lithofacies section by lithofacies section or steam；
(2) XOY coordinate system is established, X-coordinate indicates steam spread condition, and 1 indicates that steam can indicate to steam by lithofacies section, 2
Vapour can not indicate lithofacies thickness by lithofacies section, Y coordinate；The mud stone and shale side product that step (1) statistics is obtained
The lithofacies thickness and the steam spread condition of layer, which are projected to respectively in the XOY coordinate system, obtains data point, connects institute
It states data point and obtains indicatrix, the oil-sand SAGD of as different Lithofacies Types can employ interval top surface feature plate (such as Fig. 1 institute
Show)；
(3) the thickness value section of two sample points along the Y coordinate, the indicatrix jump indicates that lithofacies are complete
Stop the thickness section of steam diffusion, as division oil-sand SAGD can employ the boundary of interval top surface；
When specifically judging, the indicatrix can be observed (i.e. along the direction of Y coordinate) from bottom to top.
It is preferred that the integer value in the thickness value section of two sample points at the indicatrix jump is as division oil-sand
SAGD can employ the boundary of interval top surface.
(i.e. no monitoring means, which obtains, to be distinguished for the steam spread condition of the mud stone and shale side lamination
Subsurface picture, can not directly acquire data prove steam spread condition) oil-sand mining area, as steps described below determine oil-sand
SAGD can employ interval top surface:
Statistics oil-sand SAGD can employ the mud stone and shale side product of any oil well of interval bottom surface depth or more
The lithofacies thickness and lithofacies bottom depth of layer can insert each value in one table according to lithofacies bottom depth value descending；When the rock
It is when described division oil-sand SAGD that phase thickness reaches step (3) determination can employ the boundary of interval top surface, then thick with the lithofacies
The corresponding lithofacies bottom depth of degree can employ interval top surface as oil-sand SAGD.
Above-mentioned steps needs individually count the data of each oil well, and the data of two or more oil wells cannot be united together
Meter processing.
The invention adopts the above technical scheme, which has the following advantages:
1, the present invention is to summarize steam spread condition and Lithofacies Types and lithofacies thickness based on developed field data
Related law, instruct developer carry out oil-sand SAGD can employ interval top surface divide work, for the part work provide
Can foundation standard, the uncertainty of available reserves scale is effectively reduced.
2, the present invention is based on Lithofacies Identification oil-sand SAGD can employ interval top surface, and division result is more objective, fine, method tool
Body is easy, reduces human factor, as a result accurately and reliably.
In conclusion the present invention, which can be widely applied to oil-sand SAGD, can employ in the division work of interval top surface.
Detailed description of the invention
Fig. 1 is that the present invention is based on the boundary schematic diagrames that the oil-sand SAGD of lithofacies can employ interval top surface, wherein left figure indicates
Mud stone lithofacies, right figure indicate shale side lamination lithofacies.
Specific embodiment
Experimental method used in following embodiments is conventional method unless otherwise specified.
The materials, reagents and the like used in the following examples is commercially available unless otherwise specified.
Embodiment 1,
1) it based on developed field data, counts every interlayer Lithofacies Types, lithofacies thickness and steam spread condition.Oil
Sand interval interlayer influences steam diffusion, and Lithofacies Types include mud stone and shale side lamination；Steam spread condition refers to that steam is
It is no by certain lithofacies section, reserves on the lithofacies section cannot be employed as SAGD cannot be represented if.
2) it is based on the statistical result of step 1), the spread condition of Lithofacies Types, lithofacies thickness and steam is filled to table 1.Its
In for steam spread condition, 1 represents steam can be by the lithofacies section, and 2 represent steam can not be by the lithofacies section.
1 oil-sand developed field of table is every interlayer lithofacies and its steam spread condition statistical form
3) such as Fig. 1, an XOY coordinate system is established, X-coordinate is natural number, and Y coordinate is lithofacies thickness value, by mud stone in table 1
Lithofacies and shale side lamination lithofacies thickness and steam spread condition code project in coordinate system respectively, connect each data point and are formed
Indicatrix, the oil-sand SAGD for forming different Lithofacies Types can employ interval top surface feature plate.It is identified in conjunction with the curve:
It is complete to see that two sample point thickness value sections (along Y coordinate direction), at indicatrix jump represent this kind of lithofacies from bottom to top
The thickness section of fully blocking steam diffusion, the integer value in the section of constituency can employ interval top surface as division oil-sand SAGD
Boundary.
In Fig. 1 left figure, curve jumps in 1.9m~2.0m, illustrates that the section represents mud stone lithofacies and stops to steam completely
The thickness section of vapour diffusion, the boundary of interval top surface can be employed as division oil-sand SAGD by choosing integer value 2m in section；Fig. 1 is right
In figure, curve jumps in 2.8m~3.1m, illustrates that the section represents shale side lamination lithofacies and steam is stopped to spread completely
Thickness section, the boundary of interval top surface can be employed by choosing in section integer value 3m as division oil-sand SAGD.
4) oil-sand mining area unknown for steam spread condition, can to SAGD by boundary obtained in step 3)
Interval top surface is employed to be divided.First count each mud stone, the shale of same well (SAGD can employ interval bottom surface depth or more)
The thickness and its bottom depth value of side lamination lithofacies arrange filling table 2 by depth value descending.Successively judge from top to bottom, works as rock
The bottom depth value of the lithofacies can employ interval top surface: (1) T as oil-sand SAGD when mutually there is following two situationshale>=2；
(2)TIHS(the T of >=3shaleMud stone lithofacies thickness, m；TIHSShale side lamination lithofacies thickness, m).
Table 2A well SAGD can employ interval bottom surface depth or more every interlayer lithofacies situation statistical form
The various embodiments described above are merely to illustrate the present invention, wherein the structure of each component, connection type and manufacture craft etc. are all
It can be varied, all equivalents and improvement carried out based on the technical solution of the present invention should not exclude
Except protection scope of the present invention.
Claims (3)
1. a kind of oil-sand SAGD based on lithofacies can employ interval top surface division methods, include the following steps:
(1) mud stone of developed field and the lithofacies thickness and steam spread condition of shale side lamination are counted；
The steam spread condition refers to that steam can not be by lithofacies section by lithofacies section or steam；
(2) establish XOY coordinate system, X-coordinate indicates steam spread condition, 1 indicate steam can by lithofacies section, 2 indicate steam without
Method indicates lithofacies thickness by lithofacies section, Y coordinate；Step (1) is counted to the obtained mud stone and shale side lamination
The lithofacies thickness and the steam spread condition, which are projected to respectively in the XOY coordinate system, obtains data point, connects the number
Strong point obtains indicatrix；
(3) the thickness value section of two sample points along the Y coordinate, the indicatrix jump indicates that lithofacies stop completely
The thickness section of steam diffusion, as division oil-sand SAGD can employ the boundary of interval top surface.
2. top surface division methods according to claim 1, it is characterised in that: choose two at the indicatrix jump
Integer value in the thickness value section of sample point can employ the boundary of interval top surface as oil-sand SAGD is divided.
3. top surface division methods according to claim 1 or 2, it is characterised in that: the mud stone and shale side lamination
The oil-sand mining area that can not distinguish of steam spread condition, determine that oil-sand SAGD can employ interval top surface as steps described below:
Statistics oil-sand SAGD can employ the mud stone and shale side lamination of any oil well of interval bottom surface depth or more
Lithofacies thickness and lithofacies bottom depth；It can be employed when the lithofacies thickness reaches the division oil-sand SAGD that step (3) determine
When the boundary of interval top surface, then layer can be employed using lithofacies bottom depth corresponding to the lithofacies thickness as oil-sand SAGD
Section top surface.
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| US20160371621A1 (en) * | 2009-11-02 | 2016-12-22 | International Business Machines Corporation | Comparing utility and warranty of services |
| CN104389568A (en) * | 2014-09-29 | 2015-03-04 | 中国石油大学(北京) | Obtaining method and device of gas assisted dosage in steam assisted gravity drainage process |
| CN104809283A (en) * | 2015-04-22 | 2015-07-29 | 中国石油天然气股份有限公司 | Interlayer identification method in heavy oil reservoir |
| CN106468171A (en) * | 2015-08-19 | 2017-03-01 | 中国石油化工股份有限公司 | The laddering glutenite petrofacies method of discrimination of multi information coupling |
| CN106499374A (en) * | 2015-09-07 | 2017-03-15 | 中国石油天然气股份有限公司 | Method for improving SAGD development effect by using ammonia gas |
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