CN103558629A - Physical simulation method for different air-containing saturation sandstone reservoirs - Google Patents
Physical simulation method for different air-containing saturation sandstone reservoirs Download PDFInfo
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- CN103558629A CN103558629A CN201310579272.7A CN201310579272A CN103558629A CN 103558629 A CN103558629 A CN 103558629A CN 201310579272 A CN201310579272 A CN 201310579272A CN 103558629 A CN103558629 A CN 103558629A
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Abstract
The invention relates to a physical simulation method for different air-containing saturation sandstone reservoirs. The method comprises the steps of obtaining the size information of physical models according to actual geologic models according to the geometric similarity criterion of a seismic physical model; obtaining at least two sandstone blocks which are the same in size, and sealing the same liquid different in volume into the sandstone blocks, wherein the velocity contrast of the sandstone blocks on the dry condition is smaller than or equal to 5%, and the liquid is water or oil; casting a horizontal medium layer which comprises at least one layer according to the size information of the physical models; packaging the sandstone blocks into the same horizontal medium layer, wherein the sandstone blokes are the same in depth in the horizontal medium layer. Consequently, a set of different air-containing saturation sandstone reservoirs is constructed.
Description
Technical field
The present invention relates to the geophysical research field of oil-gas exploration and development, particularly a kind of different gas saturation sandstone reservoir physical simulating method.
Background technology
The a large amount of Study on Earthquake Dynamic that recent year has carried out for dissimilar gas-bearing reservoir.But research is in the past often all the sandstone reservoir for complete saturated air, and utilize EFFECTIVE MEDIUM THEORY to carry out mathematics forward simulation.Also actually rare for the seismic response quantitative examination of fractional saturation gas-bearing sandstone reservoir with different gas saturation.In addition, along with deepening constantly of degree of prospecting, the reservoirs such as unconventional compacted gas-bearing sandstone have become important Exploration Domain, and the feature of compacted gas-bearing sandstone reservoir to be exactly gas saturation change greatly.Therefore, this research is also significant for the Study of recognition of DAMAGE OF TIGHT SAND GAS RESERVOIRS.
At present, to those skilled in the art, all adopt the mode of mathematics forward simulation to obtain the model of different gas saturation sandstone reservoirs.Although mathematical simulation has advantages of that computing velocity is fast, efficiency is high, analog result is subject to the impact of mathematical algorithm and human factor larger, finally causes and can not well to the seismic response of different gas saturation sandstone reservoirs, carry out modeling effort.
Summary of the invention
For addressing the above problem, the present invention proposes a kind of different gas saturation sandstone reservoir physical simulating method, thereby has well overcome the shortcoming of mathematics the Forward Modeling, the seismic response of different gas saturation sandstone reservoirs is carried out to modeling effort and lay the first stone.
For achieving the above object, the invention provides a kind of different gas saturation sandstone reservoir physical simulating method, described method comprises:
According to the geometric similarity criterion of seismic physical model, according to actual geologic model, obtain the dimension information of physical model;
Obtain the sandstone piece that at least two block sizes are identical, will in every sandstone piece, seal identical liquid, and different amount; Wherein, described sandstone piece speed difference under drying regime is less than or equal to 5%, and described liquid is water or oil;
According to the dimension information cast of described physical model, comprise the horizontal interlayer of at least one layer;
Described sandstone piece is encapsulated in same level interlayer, and the deep equality of described sandstone piece in horizontal interlayer, build a set of different gas saturation sandstone reservoir.
Optionally, in an embodiment of the present invention, described different gas saturation sandstone reservoirs are for to be gradually varied to from being full of gaseity the different gas saturation sandstone reservoirs that are full of water state.
Optionally, in an embodiment of the present invention, described sandstone piece carries out velocity test by Method of Ultrasonic Penetration.
Optionally, in an embodiment of the present invention, described sandstone piece is sealed into water or the oil of different amounts by vacuumizing method, makes between sandstone piece, to have different gas saturation.
Optionally, in an embodiment of the present invention, described horizontal interlayer adopts epoxy resin and talcum powder composite material modulation cast to form.
Technique scheme has following beneficial effect: the application's technical scheme realizes based on physical model technology, relation from actual formation feature and laboratory model making, solve the problem that different gas saturation sandstone reservoir physical models may occur in designing and making, thereby can utilize better this technology to carry out the seismic response modeling effort of different gas saturation sandstone reservoirs.The maximum feature of this technology is to simulate more truly the actual geological condition in field, for the contrast of the different gas saturation sandstone reservoir of reality result of study, checking provide reliable basis.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is a kind of different gas saturation sandstone reservoir physical simulating method process flow diagrams that the present invention proposes;
Fig. 2 is different gas saturation sandstone reservoir model schematic diagram in the present embodiment.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described.Obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
As shown in Figure 1, a kind of different gas saturation sandstone reservoir physical simulating method process flow diagrams that propose for the present invention.Described method comprises:
Step 101): according to the geometric similarity criterion of seismic physical model, according to actual geologic model, obtain the dimension information of physical model;
Step 102): obtain the sandstone piece that at least two block sizes are identical, will in every sandstone piece, seal identical liquid, and different amount; Wherein, described sandstone piece speed difference under drying regime is less than or equal to 5%, and described liquid is water or oil;
Step 103): according to the dimension information cast of described physical model, comprise the horizontal interlayer of at least one layer;
Step 104): described sandstone piece is encapsulated in same level interlayer, and the deep equality of described sandstone piece in horizontal interlayer, build a set of different gas saturation sandstone reservoir.
Optionally, in an embodiment of the present invention, described different gas saturation sandstone reservoirs are for to be gradually varied to from being full of gaseity the different gas saturation sandstone reservoirs that are full of water state.
Optionally, in an embodiment of the present invention, described sandstone piece carries out velocity test by Method of Ultrasonic Penetration.
Optionally, in an embodiment of the present invention, described sandstone piece is sealed into water or the oil of different amounts by vacuumizing method, makes between sandstone piece, to have different gas saturation.
Optionally, in an embodiment of the present invention, described horizontal interlayer adopts epoxy resin and talcum powder composite material modulation cast to form.
Embodiment:
As shown in Figure 2, be different gas saturation sandstone reservoir model schematic diagram in the present embodiment.In the present embodiment, the modelling of different gas saturation sandstone reservoir is three layers of horizontal dielectric model, and the gas-bearing sandstone reservoir of simulation is arranged in second layer medium.Utilize five natural sand lumps as simulation sandstone reservoir, be encapsulated in second layer medium after making it there is different gas saturation, build and a set ofly from being full of gaseity, be gradually varied to the different gas saturation sandstone reservoirs that are full of water state.
1, horizontal layer model construction
The physical model of design is three layers of horizontal interlayer, and epoxy resin and talcum powder composite material modulation cast that interlayer is different proportion form.The velocity of longitudinal wave of three layers of interlayer increases gradually, in modelling, by control loop epoxy resins and talcum powder modulation ratio, makes between interlayer, to have different speed.The design parameter of every layer of medium sees the following form 1.
Each layer parameter of table 1 physical model
The long 79.8cm of physical model, wide is 60cm, high 30cm, according to the facts border geologic model builds model with physical model size than the ratio for 1:10000.Under this ratio, the 1mm in physical model represents the 10m in actual geologic model, is therefore converted to actual geologic model and is long 7980m, wide 6000m, dark 3000m.
2, gas-bearing sandstone reservoir builds
Utilize natural sandstone as the material of simulation sandstone reservoir.Because physical simulation at present can't accomplish that the zones of different of same sandstone medium has different gas saturation.Therefore, utilize the identical five natural sand lumps of parameter while being full of gaseity, make it there is respectively different gas saturation, build and a set ofly from being full of gaseity, be gradually varied to the simulation Sandbody Reservoirs that is full of water state.
2.1) sandstone material chooses
In order to get rid of other factors, disturb, while only investigating gas saturation variation, the difference of sandstone reservoir seismic response, first will guarantee to obtain the identical sandstone of parameter under drying regime.Therefore, by a large amount of feedstock capture and test job, polylith natural sand rock beam is processed, natural sandstone is processed into the sandstone piece that size is identical, utilize subsequently Method of Ultrasonic Penetration to carry out velocity test to sandstone piece.Five data points of every sandstone test, to test its velocity uniformity.Select on this basis the sand lump that speed difference is little, while accomplishing to be dried, speed is consistent as far as possible.Finally obtain five have good uniformity, sandstone that speed difference is very little; Under drying regime, the speed difference of five blocks of sandstone is controlled in 5%.
2.2) preparation of different gas saturation sandstone
While utilizing drying regime, parameter approaches identical five natural sand lumps, utilizes vacuumizing method every block of sandstone to be sealed into the water of different amounts, makes it have different gas saturation.Sand body is encapsulated in model second layer medium the most at last, builds a set ofly from being full of gaseity, to be gradually varied to the different gas saturation sandstone reservoirs that are full of water state.Five parameters with the sandstone of different gas saturation see the following form 2.
Table 2 natural sandstone parameter
After model completes, can utilize physical model data observation acquisition system to carry out seismic data acquisition, thereby carry out the research of different gas saturation sandstone reservoir seismic responses.
Above-described embodiment; object of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the foregoing is only the specific embodiment of the present invention; the protection domain being not intended to limit the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (5)
1. different gas saturation sandstone reservoir physical simulating methods, is characterized in that, described method comprises:
According to the geometric similarity criterion of seismic physical model, according to actual geologic model, obtain the dimension information of physical model;
Obtain the sandstone piece that at least two block sizes are identical, will in every sandstone piece, seal identical liquid, and different amount; Wherein, described sandstone piece speed difference under drying regime is less than or equal to 5%, and described liquid is water or oil;
According to the dimension information cast of described physical model, comprise the horizontal interlayer of at least one layer;
Described sandstone piece is encapsulated in same level interlayer, and the deep equality of described sandstone piece in horizontal interlayer, build a set of different gas saturation sandstone reservoir.
2. the method for claim 1, is characterized in that, described different gas saturation sandstone reservoirs are for to be gradually varied to from being full of gaseity the different gas saturation sandstone reservoirs that are full of water state.
3. the method for claim 1, is characterized in that, described sandstone piece carries out velocity test by Method of Ultrasonic Penetration.
4. the method for claim 1, is characterized in that, described sandstone piece is sealed into water or the oil of different amounts by vacuumizing method, makes between sandstone piece, to have different gas saturation.
5. the method for claim 1, is characterized in that, described horizontal interlayer adopts epoxy resin and talcum powder composite material modulation cast to form.
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| CN109164504A (en) * | 2018-09-25 | 2019-01-08 | 中国石油天然气集团有限公司 | A kind of shale physical model of variable element and its preparation method and application |
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| CN106405638A (en) * | 2015-07-28 | 2017-02-15 | 中国石油化工股份有限公司 | Method and apparatus for determining gas saturation |
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Application publication date: 20140205 |