CN1773554A - A two-dimensional closed geological structure model building method - Google Patents
A two-dimensional closed geological structure model building method Download PDFInfo
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- CN1773554A CN1773554A CN 200410088562 CN200410088562A CN1773554A CN 1773554 A CN1773554 A CN 1773554A CN 200410088562 CN200410088562 CN 200410088562 CN 200410088562 A CN200410088562 A CN 200410088562A CN 1773554 A CN1773554 A CN 1773554A
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Abstract
A method for setting up model of two-dimensional closed geological structure includes using dot, section, line and face to define layer boundary and fault boundary of geological structure, using two-dimensional mode to present a series of closed face with the same layer attribute. The model prepared by the method can be used to describe various complicated geological structure such as normal fault, reversed fault, thin-out structure, etc.
Description
Relate to the field
The present invention relates to the geophysical prospecting for oil field, is a kind of foundation method of prime number value model two-dimensionally.
Background technology
Generally speaking, subsurface formations is the layer structure that is formed by deposition.Through repeated tectonic movements, various deformation take place in the stratum, and dissimilar tomography cuts formation causes the subterranean formations complexity various.Common stratal configuration has trap-down, trap-up, pinching, intrusive body etc.
Adopt the layer structure modeling method when usually, describing geologic structure model.The interfacial description in stratum is required to write the continuous interfacial that extends through right margin from left margin.And requiring the interface function is the single-valued function of variable, and stratal surface does not allow to exist the inflection phenomenon.When tomography is described, can only adopt the describing mode of aspect approx.When the geology complex structure, promptly more and when having structural change such as stratigraphic pitch-out when tomography, adopt just difficulty relatively of method that layer structure describes.A kind of approximate method is to add some imaginary interfaces, makes original discontinuous segmentation interface become the continuous interfacial that extends through right margin from left margin in form.These imaginary interfaces are called empty interface.So-called empty interface is actually non-existent interface, and the layer attribute of media of both sides is identical up and down at definition empty interface on the mathematics.
When the geology structure was very complicated, above-mentioned layer structure modeling method was difficult to even can not the accurate description geologic model.For example in the China's western region, the geologic structure complexity ruptures and grows, and traditional modeling method can not satisfy actual needs, has limited the forward modeling broad application.
Goal of the invention
The objective of the invention is deficiency, propose a kind of two-dimensional closed geological structure model building method, solve the description of various complicated geological structural models, satisfy demand of practical production at existing method.
Summary of the invention
The two dimension geologic structure can be regarded a series of geologic units with same formation media property (speed and density) as, each geologic unit can be represented with a sealing surface, geologic structure model just can be divided into a series of independently sealing surfaces unit according to layer attribute like this, all independently seal geology face unit and arrange in order by space distribution, the aggregate of forming just makes up a two-dimentional geologic model, is called two-dimensional closed structural model.
At the problem that exists in the background technology, the present invention defines the bed boundary of geologic structure and tomography interface with point, section, line and face.Carry out enclosed construction by the stratum media attribute then and divide, two-dimentional geologic model is represented with a series of sealing surfaces with same formation media property.Two-dimensional closed structural model is actually by a series of sealing surfaces arrangements and forms, and each sealing surface is to be surrounded by line to form.The line here is meant bed boundary, tomography interface or model boundary.
The method of two-dimensional closed geologic structure modeling below is described.
When setting up geologic model, known information only is limited position control point data such as bed boundary or tomography interface.The meaning of above-mentioned point, section, line and sealing surface is as follows respectively:
Point P (x, z): be the reference mark of bed boundary or tomography interfacial configuration, or the joining of they and model boundary.Wherein, x is horizontal direction (laterally) spatial control coordinate, and z is vertical direction (vertically) spatial control coordinate.Point is the most basic parameter, is the Given information of modelling, and other information are all drawn from point.
Section D (x, z): be the straight-line segment that is linked to each other and to be formed by two consecutive point, the top of section can only corresponding a kind of media property, and the below of section can only corresponding another kind of media property, otherwise is invalid section.Segment table is understood the validity of point, promptly for sealing surface nonsensical name a person for a particular job disallowable.
Line L (x, z): by one or more adjacent, media property respectively consistent effective section in stratum formed up and down.Section is the least unit of line.Line is to local continuous bed boundary, the description at tomography interface in the two dimensional model, is the method for expressing with the refinement of two-dimensional complex construction model.
Sealing surface S (x, z): be the closed region that surrounds by line, have identical stratum media attribute.The geologic unit of sealing surface representative sealing is the method for expressing of the stratum media in the geologic structure, and is changeable, and the labyrinth according to model determines fully.
By introducing the notion of point, section, line and face, two-dimensional closed structural model can by a section of formation, form line by section from known point, is formed of a wire sealing surface.The set of all sealing surfaces forms two-dimensional closed structural model.The topological relation of two-dimensional closed structure geologic model is expressed as:
Known control point → mold segment → model line → sealing surface → two-dimensional closed structural model.
In the modeling of two-dimensional closed structure geology, need carry out numerical value to the line L of sealing bin and describe.Because bed boundary is generally smooth line, the whole deposition characteristics on reflection stratum; The tomography interface is generally non-smooth line, the cutting feature of reflection tomography.Line available segment cubic spline function for smooth interface is represented:
f(x)＝a
i(x-x
i)
3+b
i(x-x
i)
2+c
i(x-x
i)+z
i
Line useable linear function representation to non-smooth interface:
Wherein xi, zi are the spatial control coordinate, and ai, bi, ci are fitting coefficient, can be obtained by the reference mark.
In the modeling of two-dimensional closed structure geology, also need to solve the automatic tracking problem of sealing surface.From model structure, the reference mark of model can be divided into two kinds of situations, and a kind of is to be in the middle point of model line, and it links to each other with left and right sides consecutive point, and belongs to same model line, is called continuity point; Another kind is the end points of model line, also is and the intersection point of adjacent model line, belongs to two or many model line, is called branch.The sealing surface tracking is to carry out along the line by point according to the notion of graphics, and detailed process is described as:
(1) select any one model points, from this point, counterclockwise or clockwise direction is searched for next model points along residing model line;
(2) character of judgement search model point:
If this model points is a continuity point, then continue the next model points of search;
If this point is a branch, then inside cord is former sealing surface, continues search downwards; And out conductor is the starting point that new sealing surface is followed the trail of;
(3) by the tracking principle of (1) and (2), till getting back to starting point, finish the tracking of a closed level;
(4) search of finishing all branch out conductors is successively followed the trail of;
(5) to following the trail of resulting all closed levels, arrange, get rid of the result who repeats through comparison operation by forming dot sequency;
(6) give stratum media attribute (as speed and density) respectively to the whole closed levels that obtain, promptly obtain sealing surface and finish the tracking of whole sealing surfaces.
The invention effect
Closed geological structure model building method is the numerical value describing method of geologic structure model.It is the basis of forward simulation in the oil seismic exploration, is the technological means that effectively solves in the geophysical problems uncertain and multi-solution.
Two-dimensional closed structural model is cast aside traditional geology modeling notion, define subsurface geologic structures in the picture mosaic mode, its advantage is the restriction that is not subjected to subsurface geologic structures, can describe the geological phenomenon of any complexity, comprises trap-down, trap-up, stratigraphic pitch-out, phacoid etc.
Describe owing to the invention solves the numerical value of smooth and non-fair line, and the automatic tracking problem of sealing surface, made things convenient for the design of computer interactive modeling software, increase operability.
Description of drawings
Fig. 1 two dimension is complex structure model encapsulates structural modeling result schematic diagram in front of the mountains
Concrete enforcement
Embodiment 1
Two dimension is complex structure model encapsulates structural modeling (Fig. 1) in front of the mountains.
Adopt the segmentation cubic spline function to represent the smooth interface line:
f(x)＝a
i(x-x
i)3+b
i(x-x
i)
2+c
i(x-x
i)+z
i
Adopt linear function to represent non-smooth interface line:
Claims (6)
1, a kind of two-dimensional closed geological structure model building method is characterized in that, two-dimensional closed geologic structure model is from limited reference mark data, by a section of formation, form line by section, close by coil and form sealing surface, the set of all sealing surfaces forms two-dimensional closed geologic structure model, wherein:
Point P (x, z): be the reference mark of bed boundary or tomography interfacial configuration, or the joining of these interfaces and model boundary;
Section D (x, z): be the straight-line segment that is linked to each other and to be formed by two consecutive point, the top of section can only corresponding a kind of media property, and the below of section can only corresponding another kind of media property, otherwise is invalid section;
Line L (x, z): by one or more adjacent, media property respectively consistent effective section in stratum formed up and down;
Sealing surface S (x, z): be the closed region that surrounds by line, have identical stratum media attribute;
Utilize the graphics method, follow the trail of all sealing surfaces automatically, detailed process is:
(1) select any one model points, from the beginning of this point along residing model line counterclockwise or clockwise direction search for next model points;
(2) character of judgement search model point;
If this model points is a continuity point, then continue the next model points of search;
If this model points is a branch, then inside cord is former sealing surface, continues search downwards; And out conductor is the starting point that new sealing surface is followed the trail of;
(3) by the tracking principle of (1) and (2), till getting back to starting point, finish the tracking of a closed level;
(4) search of finishing all branch out conductors is successively followed the trail of;
(5) to following the trail of resulting all closed levels, arrange, get rid of the result who repeats through comparison operation by forming dot sequency;
(6) give the stratum media attribute respectively to the whole closed levels that obtain, obtain sealing surface and finish the tracking of whole sealing surfaces.
2, a kind of two-dimensional closed geological structure model building method as claimed in claim 1 is characterized in that, described two-dimensional closed geologic structure model has following topological relation:
The known control point-〉 mold segment-model line-sealing surface-two-dimensional closed structural model.
3, a kind of two-dimensional closed geological structure model building method as claimed in claim 1 or 2 is characterized in that, described continuity point is meant and is in the middle point of model line that it links to each other with left and right sides consecutive point, and belongs to same model line; Described branch is meant the end points of model line, also is and the intersection point of adjacent model line, belongs to two or many model line.
4, a kind of two-dimensional closed geological structure model building method as claimed in claim 1 or 2 is characterized in that, described limited reference mark data are meant the reference mark data at bed boundary or tomography interface etc.; Described line is meant bed boundary, tomography interface or model boundary.
5, a kind of two-dimensional closed geological structure model building method as claimed in claim 1 or 2 is characterized in that, described line comprises smooth with non-smooth, adopts mathematical function to describe these lines.
As claim 1 or 2 or 5 described a kind of two-dimensional closed geological structure model building methods, it is characterized in that 6, described fair line available segment cubic spline function is represented:
f(x)＝a
i(x-x
i)
3+b
i(x-x
i)
2+c
i(x-x
i)+z
i
Non-fair line useable linear function representation:
Wherein xi, zi are the spatial control coordinate, and ai, bi, ci are fitting coefficient.
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| CN 200410088562 CN1773554A (en) | 2004-11-09 | 2004-11-09 | A two-dimensional closed geological structure model building method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104879711A (en) * | 2015-06-02 | 2015-09-02 | 江南大学 | Design method of double-free-form-surface LED (light emitting diode) uniform-light lens based on cubic spline |
| CN107238860A (en) * | 2016-03-28 | 2017-10-10 | 中国石油化工股份有限公司 | The modeling method and system of D geology model |
| CN109885936A (en) * | 2019-02-22 | 2019-06-14 | 中国铁路设计集团有限公司 | It is a kind of two dimension geological section in geological boundary tracking discrimination method and system |
| CN110570509A (en) * | 2019-08-27 | 2019-12-13 | 华中科技大学 | grid-based model partition slicing method |
-
2004
- 2004-11-09 CN CN 200410088562 patent/CN1773554A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104879711A (en) * | 2015-06-02 | 2015-09-02 | 江南大学 | Design method of double-free-form-surface LED (light emitting diode) uniform-light lens based on cubic spline |
| CN104879711B (en) * | 2015-06-02 | 2017-11-24 | 江南大学 | A kind of even optical lens design method of double free-form surface LEDs based on cubic spline |
| CN107238860A (en) * | 2016-03-28 | 2017-10-10 | 中国石油化工股份有限公司 | The modeling method and system of D geology model |
| CN109885936A (en) * | 2019-02-22 | 2019-06-14 | 中国铁路设计集团有限公司 | It is a kind of two dimension geological section in geological boundary tracking discrimination method and system |
| CN109885936B (en) * | 2019-02-22 | 2023-07-14 | 中国铁路设计集团有限公司 | Tracking and identifying method and system for geological boundary in two-dimensional geological section diagram |
| CN110570509A (en) * | 2019-08-27 | 2019-12-13 | 华中科技大学 | grid-based model partition slicing method |
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