CN104361228B - A kind of dry-hot-rock geothermal Resources calculation method - Google Patents
A kind of dry-hot-rock geothermal Resources calculation method Download PDFInfo
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- CN104361228B CN104361228B CN201410625944.8A CN201410625944A CN104361228B CN 104361228 B CN104361228 B CN 104361228B CN 201410625944 A CN201410625944 A CN 201410625944A CN 104361228 B CN104361228 B CN 104361228B
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Abstract
The invention discloses the geothermal energy resources amount computational methods in a kind of target area, it is comprised the following steps：Step 1, determine target area boundaries and dry-hot-rock geothermal attribute information collection is carried out to data collection point；Step 2, the target area is divided into many sub-regions using Thiessen polygon method；The geothermal energy resources amount of step 3, calculating per sub-regions, and all subregions are sued for peace or calculating of being quadratured, obtain the geothermal energy resources amount in whole target area.The present invention takes full advantage of the geographical location information of underground heat sampled point and has carried out uniqueness segmentation to target area, avoid many solutions, be conducive to carrying out target area geothermal energy resources amount evaluation, method delimit resource exploitation Favorable Areas according to this, reduce exploration expenditure, Development of Geothermal Resources risk is reduced, effective exploitation and the utilization of geothermal energy resources is finally realized.
Description
Technical field
The present invention relates to a kind of new method that dry-hot-rock geothermal stock number is calculated based on Thiessen polygon method.
Background technology
Underground heat is a kind of energy resource from earth interior, and it is in itself one huge " heat reservoir " that this comes from the earth, is accumulate
Hide huge " heat energy ".These " heat " ooze out earth's surface by the earth's crust or oceanic crust, then just there is underground heat.Geothermal energy resources refer to storage
There is the recoverable heat energy of earth interior, originate from melting magma and the decay of radioactive substance of earth interior.Come from for a long time
See, geothermal energy is a kind of cleaning, regenerative resource, its DEVELOPMENT PROSPECT is very wide.Because geothermal energy is derived from and is stored in ground
Under, therefore by surface conditions, such as weather, landforms, runoff, influence smaller, therefore with stability and security very high.
Application of the current geothermal energy in global many areas is quite extensive, and development technique is also increasingly perfect.
Geothermal energy resources can be divided into two kinds of hot water type and xeothermic lithotype by its origin cause of formation and output condition, wherein, xeothermic lithotype ground
Generality and heat-storage model high that thermal resource is distributed with it and more potentiality to be exploited and prospect.Hot dry rock be a kind of cleaning can be again
Dried rhizome of rehmannia thermal resource, in past 40 years, the utilization technology of hot dry rock reaches its maturity, and has shown huge value.China
Land area vast area and it is located in three macroplate intersections, with good hot dry rock preservation background.
" hot dry rock " (Hot Dry Rock), from literal upper understanding, it is a kind of hot rock mass without water or steam, together
When, hot dry rock is also a kind of important geothermal energy resources.Hot dry rock is generally buried in the depths away from 2~6 kilometers of earth's surface, its temperature model
It is trapped among between 150~650 DEG C, belongs to high-temperature geothermal resource (150 DEG C of ＞).The distribution of hot dry rock is almost extended over the entire globe, including each
It is a kind of nearly ubiquitous resource in the even ocean of continent.Whether judgement somewhere has hot dry rock Exploitative potential, most bright
Aobvious mark is to see whether geothermic gradient has an exception, or the certain depths in underground (2000~5000m) temperature whether up to 150 DEG C with
On.
Dry-hot-rock geothermal Resources calculation is the first step of hot dry rock RESERVE EVALUATION, is also the basic work of hot dry rock exploitation
Make.First, dry-hot-rock geothermal Resources calculation has reasonability.The stratum of underground is made up of the rock of different lithology, ground
Matter Development Practice proves, it in some scale is spatially to connect that rock has certain continuity, i.e. rock on transverse direction, longitudinal direction
Continuous distribution, this is that dry-hot-rock geothermal Resources calculation provides basis of reality and theoretical foundation, its result of calculation reasonable and
No, error size, crucial governing factor, space scale divide and the resonable degree estimated this also exactly the present invention is attempted
The problem of solution.Secondly, how scientific and rational calculating dry-hot-rock geothermal stock number, and then to the hot dry rock in certain area
Geothermal energy resources are estimated, significant to dry-hot-rock geothermal development of resources.First, the stock number in Shi Dui areas is
Solution, for the Economic Value Evaluation at initial stage provides data basis；It is dry-hot-rock geothermal money second, being preliminary delineation exploitation dominant area
Source exploitation provides direction and guarantee.
At present, the computational methods of dry-hot-rock geothermal stock number mainly use volumetric method, i.e. dry-hot-rock geothermal total resources Q etc.
The heat of institute's preservation in low porosity permeability (quantity of heat storage of fluid in ignoring rock) xeothermic rock medium, computing formula is Q=ρ * C*
V*(T-T0), wherein ρ is rock density, and C is rock specific heat, and V is rock volume, and T is the rock temperature in certain depth, T0For
Surface temperature.From computing formula as can be seen that the geothermal energy resources amount that is contained of hot dry rock depends on the temperature of hot dry rock and xeothermic
The hot physical property of rock rock.
As can be seen that the density of key variables of dry-hot-rock geothermal Resources calculation including hot dry rock, specific heat, volume and
With the temperature difference of earth's surface.Volume is typically tried to achieve by region area with the product of hot dry rock thickness, in addition several key variables
Conventional preparation method mainly has：Frequency distribution statistic law, unbiased variance statistics method and 1 ° × 1 ° longitude and latitude grid division statistic law.Generally
Total data carries out frequency distribution statistics in rate distribution statisticses Fa Shidui areas, to determine the value of each key variables, this method
Geographical position with data collection point is unrelated, and only relevant with frequency distribution.Several crucial changes in unbiased variance statistics Fa Shidui areas
The measured data of amount carries out simple mean square deviation calculating to obtain representative value respectively, be subsequently used for calculate, this method with
Frequency distribution statistic law is similar to, and also the geographical position with data collection point is unrelated, and a region is only capable of obtaining a representative
Property numerical value.1 ° × 1 ° longitude and latitude grid division statistic law is that selection area is carried out into gridding division with 1 ° × 1 ° longitude and latitude, so
After carry out subregion statistics, according to the statistics of each subregion, determine the value and the method for calculating of each key variables, should
Method considers the geographical position of data collection point to a certain extent, but the method divided with regular longitude and latitude grid, still
The positive connection in data collection point geographical position and region between dry-hot-rock geothermal stock number is so isolated.
The content of the invention
Not enough for more than, the present invention is intended to provide a kind of dry-hot-rock geothermal Resources calculation method, it is based on data and adopts
Collection point geographical position carries out classifying rationally to target area by Thiessen polygon method, and hot dry rock ground in target area is calculated according to this
Thermal resource amount.
To achieve these goals, the present invention is adopted the technical scheme that：
A kind of dry-hot-rock geothermal Resources calculation method, it is comprised the following steps：
Step 1, determine target area boundaries and geothermal behavior information gathering is carried out to data collection point, obtain boundary graph
Shape；
Step 2, the target area is divided into many sub-regions using Thiessen polygon method, it is comprised the following steps：
Step 21, based on border figure and data collection point, draw the delaunay triangulation network, to ensure triangle gridding
Uniqueness；The delaunay triangulation network is made up of a series of acute triangles, and each acute triangle constitutes the delaunay triangulation network
Sub- triangle；
Step 22, using drawing, try to achieve every sub- circumcentre of a triangle in the delaunay triangulation network；
Step 23, by all adjacent sub- circumcentres of a triangle in target area boundaries with straight line connect, constitute Tyson it is many
Side shape, completes the classifying rationally to target area；The outer boundary of the Thiessen polygon be target area boundaries, inside it by
Multiple sub-polygon adjoinings are formed and complete parttion target area scope, and only one data acquisition is surrounded in each sub-polygon
Point, each sub-polygon constitutes the subregion that region is the target area；
The calculating of geothermal energy resources amount in step 3, target area, it is comprised the following steps：
Step 31, the area for calculating every sub-regions；
Step 32, using the data collection point that surrounds in each sub-polygon as the index point of the sub-polygon, with the mark
The hot dry rock thickness data of will point actual measurement calculates the hot dry rock volume per sub-regions, the hot dry rock volume to represent data
It is the area and the product of hot dry rock thickness of the subregion；
Step 33, using the data collection point that surrounds in each sub-polygon as the index point of the sub-polygon, with the mark
The dry-hot-rock geothermal attribute data of will point actual measurement calculates the geothermal energy resources amount per sub-regions, the underground heat category to represent data
Property data include hot dry rock density, hot dry rock specific heat capacity, hot dry rock temperature and surface temperature, the dry-hot-rock geothermal stock number
For difference four parameters of hot dry rock density, hot dry rock specific heat capacity, hot dry rock volume and hot dry rock temperature and surface temperature multiply
Product；
After step 34, the geothermal energy resources amount of all subregions of completion are calculated, the geothermal energy resources amount to all subregions is entered
Row summation or computing of quadraturing, obtain the geothermal energy resources amount in whole Thiessen polygon region, complete to the ground in target area
Thermal resource amount is calculated.
The step 1 is comprised the following steps：
Step 11, field survey is carried out by handhold GPS equipment and the boundary coordinate of target area is recorded, it is whole to determine
The border of target area；
Step 12, the position according to the determination data collection point of regional geothermal resource investigation data；
Step 13, by handhold GPS equipment, corresponding data collection point is arrived at, to the hot dry rock of each data collection point
Geothermal behavior information is acquired, to obtain the dry-hot-rock geothermal attribute data of each data collection point, while record data is adopted
Collect warp, latitude coordinate and the height above sea level of point；
Step 14, the data acquisition point coordinates for arranging step 11 boundary coordinate for recording and step 13 being recorded are organized into table
Lattice file；
Step 15, using GIS software, boundary coordinate is generated into border graphic file, by the form document
Import in GIS software, generate data collection point graphic file.
The border graphic file and data collection point graphic file are standard shp forms.
The form document includes data collection point numbering, data collection point title, data collection point longitude coordinate, data
The dry-hot-rock geothermal attribute information that collection point latitude coordinate, data collection point height above sea level, data collection point are measured on the spot, it is described
Dry-hot-rock geothermal attribute information includes name of the information and the corresponding numerical value of the name of the information.Name of the information include hot dry rock density,
Hot dry rock specific heat capacity, four titles of parameter of hot dry rock temperature and surface temperature.
Compared with prior art, the advantage of the invention is that：
1st, target area is divided according to data collection point geographical location information first.
Data collection point is important subsurface information sample, and its core meaning is that hot dry rock is continuously distributed in underground
In the case of, with collection point geographical position closer to place, the value difference of its actual geothermal behavior information and collection point actual measurement is away from just
It is smaller.In other words, can accurately be represented in certain geography scope with the data collection point that geographical location information is important mark
Geothermal behavior data.Therefore, abandon and in the past mean parameter determined by statistic law and calculate the method (base of geothermal energy resources amount
It is also finally that grid intrinsic parameter value is determined by statistic law in 1 ° × 1 ° method of longitude and latitude mesh generation target area is fixed
), there is reliable theoretical foundation and show using sub-zone dividing is carried out to target area based on data collection point geographical position
Sincere justice.
2nd, division methods have reasonability.
Thiessen polygon method has many good characteristics in terms of neighbor analysis：1. only contain in each Thiessen polygon
One discrete points data；2. the point in Thiessen polygon is to the closest of corresponding discrete point；3. it is located on Thiessen polygon side
Point to the discrete point on its both sides distance it is equal.The present invention makes full use of these good characteristics, with discrete data collection point
Geographical position is that foundation classifying rationally target area is many sub-regions, by discrete data sample point data and whole target area
Dry-hot-rock geothermal Resources calculation is connected, with sufficient theoretical foundation and realistic meaning.
3rd, division methods have uniqueness.
Sub-zone dividing only has reasonability not enough, it is necessary to consider another key issue --- and whether only the division in region
One, otherwise it is likely to result in uncontrollable calculation error between different demarcation mode.In the structure of Thiessen polygon, first have to by from
Scatterplot constitutes the triangulation network, and this triangulation network is referred to as the delaunay triangulation network (Delaunay Triangulation).It is more with Tyson
Side shape is bigraph relation.For the initial point set P for giving, there are various triangulation network partition patterns, if meeting following characteristics, by
The referred to as delaunay triangulation network：1. the external boundary of the triangulation network constitutes the convex polygon " shell " of point set P；2. without any o'clock three
Inside angular circumscribed circle；If the minimum angle of each triangle in the triangulation network 3. is carried out into ascending order arrangement, the row of the triangulation network
The numerical value that row are obtained is maximum.In this sense, the delaunay triangulation network be " closest to regularization " the triangulation network.De Lao
No matter a key property of interior triangular net is exactly the network forming since the where of region, consistent result finally will be all obtained, i.e.,
Network forming has uniqueness.According to the property of bigraph, it is also tool that the uniqueness of the delaunay triangulation network means that Thiessen polygon is divided
There is uniqueness.
Brief description of the drawings
Fig. 1 is that (wherein (a) is border and data collection point to Thiessen polygon method region division schematic diagram；B () is with each number
It is the delaunay triangulation network that summit is constituted according to collection point；C () is to form Thiessen polygon on the basis of the delaunay triangulation network；(d)
It is the Thiessen polygon division result to region)；
Fig. 2 is the border (by taking Inner Mongolia Autonomous Region as an example) of target area；
Borders and data collection point of the Fig. 3 for target area (by taking Inner Mongolia Autonomous Region as an example)；
Fig. 4 is divided (by taking Inner Mongolia Autonomous Region as an example) for the Thiessen polygon of target area；
Fig. 5 is a kind of schematic flow sheet of new dry-hot-rock geothermal Resources calculation method of the present invention.
Specific embodiment
Specific implementation of the invention is further described below in conjunction with accompanying drawing：
Embodiment
Refer to shown in Fig. 5, a kind of dry-hot-rock geothermal Resources calculation method, it is comprised the following steps：
The determination and fixed point geothermal behavior information gathering of 1 target area boundaries
1.1 by handhold GPS equipment, field survey, record target area boundaries；
1.2 according to regional geothermal resource investigation data, it is determined that data collection point position on the spot；
1.3, by handhold GPS equipment, arrive at the predetermined area, carry out dry-hot-rock geothermal attribute information (at least including collection point
The hot dry rock rock density of actual measurement, rock specific heat capacity, depth of stratum and temperature) collection, record, and be organized into " * * areas
Dry-hot-rock geothermal AIT ", while recording collection point warp, latitude coordinate and height above sea level；
1.4 arrange boundary coordinate and collection point coordinates, wherein it is form that collection dot file should be arranged, form includes：
Collection point numbering, collection point title, collection point longitude coordinate, collection point latitude coordinate, collection point height above sea level, collection point measure on the spot
Dry-hot-rock geothermal attribute information (at least including hot dry rock rock density, rock specific heat capacity, depth of stratum and temperature in area)
Title and numerical value；
1.5 utilize GIS software, generate border graphic file boundary.shp (Fig. 2)；Arrangement is obtained
Collection dot file import GIS software, generation data collection point graphic file stations.shp (Fig. 3), file
Form uses standard shp forms；
Target area is divided into some zonules by 2 using Thiessen polygon method
2.1 based on border figure and data collection point, draws the delaunay triangulation network (Delaunay
Triangulation), it is ensured that the uniqueness of triangulation, in addition, it is necessary to special instruction, the delaunay triangulation network by
A series of acute triangles are constituted, and each triangle in our triangulation networks is called sub- triangle；
2.2 utilize drawing, try to achieve every sub- circumcentre of a triangle in the delaunay triangulation network；
2.3 connect adjacent sub- circumcentre of a triangle in target area boundaries with straight line, constitute Thiessen polygon
(Thiessen Polygons), completes the classifying rationally to target area, and the division has uniqueness.In addition, it is necessary to especially say
Bright, the outer boundary of Thiessen polygon is the border of target area, internal adjacent by multiple sub-polygons (side number does not know)
Form and complete parttion target area scope, in each sub-polygon, surround only one data collection point (Fig. 4)；
The calculating of geothermal energy resources amount in 3rd area
3.1 in view of division in foregoing 2.3, region is divided into multiple sub-polygon regions by Thiessen polygon, per height
Polygonal region constitutes the subregion of Thiessen polygon namely target area, calculates the area per sub-regions；
3.2 in view of division in foregoing 2.3, region is divided into multiple sub-polygon regions by Thiessen polygon, per height
Possess unique collection point in polygonal region, the index point with data collection point as sub-polygon, with the hot dry rock that the point is measured
Thickness data calculates the volume per sub-regions hot dry rock to represent data, and it is dry that computational methods are that the area obtained in 3.1 is multiplied by
Hot rock thickness；
3.3 in view of division in foregoing 2.3, region is divided into multiple sub-polygon regions by Thiessen polygon, per height
Possess unique collection point in polygonal region, the index point with data collection point as sub-polygon is belonged to the underground heat that the point is surveyed
Property data to represent data, geothermal energy resources amount calculating is carried out to the subregion that the sub-polygon is represented, computational methods are " hot dry rock
Density ", " hot dry rock specific heat capacity ", " hot dry rock volume " and " difference of hot dry rock temperature and surface temperature " several numerical value multiply
Product, wherein, " hot dry rock density ", " hot dry rock specific heat capacity ", " hot dry rock temperature ", " surface temperature " are measured on the spot by 1.3, " dry
Hot rock mass product " is tried to achieve by 3.2；
3.4 complete the calculating per sub-regions, and result is sued for peace or quadratured, and obtain the geothermal energy resources amount of whole region,
The geothermal energy resources amount completed in target area is calculated.
The preferred embodiments of the present invention are the foregoing is only, is not intended to limit the invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.It is all within the spirit and principles in the present invention, made any repair
Change, equivalent, improvement etc., should be included within the scope of the present invention.
Claims (4)
1. a kind of dry-hot-rock geothermal Resources calculation method, it is characterised in that it is comprised the following steps：
Step 1, determine target area boundaries, obtain border figure, and all of data collection point in target area is done
Hot rock geothermal behavior information gathering, obtains the dry-hot-rock geothermal attribute data of data collection point；
Step 2, the target area is divided into many sub-regions using Thiessen polygon method, it is comprised the following steps：
Step 21, based on border figure and data collection point, draw the delaunay triangulation network, to ensure the unique of triangle gridding
Property；The delaunay triangulation network is made up of a series of acute triangles, and each acute triangle constitutes the son of the delaunay triangulation network
Triangle；
Step 22, using drawing, try to achieve every sub- circumcentre of a triangle in the delaunay triangulation network；
Step 23, by all adjacent sub- circumcentres of a triangle in target area boundaries with straight line connect, constitute Thiessen polygon,
Complete the classifying rationally to target area；The outer boundary of the Thiessen polygon is target area boundaries, by multiple inside it
Sub-polygon adjoining is formed and complete parttion target area scope, and only one data collection point is surrounded in each sub-polygon,
Each sub-polygon constitutes the subregion that region is the target area；
The calculating of geothermal energy resources amount in step 3, target area, it is comprised the following steps：
Step 31, the area for calculating every sub-regions；
Step 32, using the data collection point that surrounds in each sub-polygon as the index point of the sub-polygon, with the index point
The hot dry rock thickness data of actual measurement calculates the hot dry rock volume per sub-regions to represent data, and the hot dry rock volume is should
The area of subregion and the product of hot dry rock thickness；
Step 33, using the data collection point that surrounds in each sub-polygon as the index point of the sub-polygon, with the index point
The dry-hot-rock geothermal attribute data of actual measurement calculates the geothermal energy resources amount per sub-regions, the geothermal behavior number to represent data
According to including hot dry rock density, hot dry rock specific heat capacity, hot dry rock temperature and surface temperature, the dry-hot-rock geothermal stock number is dry
Hot rock density, hot dry rock specific heat capacity, four products of parameter of difference of hot dry rock volume and hot dry rock temperature and surface temperature；
After step 34, the geothermal energy resources amount of all subregions of completion are calculated, the geothermal energy resources amount to all subregions is asked
With or computing of quadraturing, obtain the geothermal energy resources amount in whole Thiessen polygon region, complete to the underground heat money in target area
Source amount is calculated.
2. dry-hot-rock geothermal Resources calculation method according to claim 1, it is characterised in that the step 1 include with
Lower step：
Step 11, field survey is carried out by handhold GPS equipment and the boundary coordinate of target area is recorded, to determine whole target
The border in region；
Step 12, the position according to the determination data collection point of regional geothermal resource investigation data；
Step 13, by handhold GPS equipment, corresponding data collection point is arrived at, to the dry-hot-rock geothermal of each data collection point
Attribute information is acquired, to obtain the dry-hot-rock geothermal attribute data of each data collection point, while record data collection point
Warp, latitude coordinate and height above sea level；
Step 14, the data acquisition point coordinates for arranging step 11 boundary coordinate for recording and step 13 being recorded are organized into form text
Part；
Step 15, using GIS software, boundary coordinate is generated into border graphic file, the form document is imported
In GIS software, data collection point graphic file is generated.
3. dry-hot-rock geothermal Resources calculation method according to claim 2, it is characterised in that the border graphic file
Standard shp forms are with data collection point graphic file.
4. dry-hot-rock geothermal Resources calculation method according to claim 2, it is characterised in that the form document includes
Data collection point numbering, data collection point title, data collection point longitude coordinate, data collection point latitude coordinate, data acquisition
The dry-hot-rock geothermal attribute information that point height above sea level, data collection point are measured on the spot, the dry-hot-rock geothermal attribute information includes
Name of the information and the corresponding numerical value of the name of the information.
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| CN105528522A (en) * | 2015-12-15 | 2016-04-27 | 中国石油天然气股份有限公司 | Method and device for calculating quantity of resources of continuous oil and gas reservoir based on space grids |
| CN108520101B (en) * | 2018-03-13 | 2021-11-16 | 中国科学院广州能源研究所 | Method for predicting scaling of geothermal well pipe |
| CN108564285A (en) * | 2018-04-18 | 2018-09-21 | 江苏方天电力技术有限公司 | A kind of evaluation method based on Thiessen polygon photovoltaic generation resource distribution |
| CN111984721A (en) * | 2020-09-08 | 2020-11-24 | 北京探矿工程研究所 | Geothermal resource comprehensive evaluation system and method |
| CN112200859A (en) * | 2020-10-30 | 2021-01-08 | 久瓴(江苏)数字智能科技有限公司 | Target area processing method and device, storage medium and electronic device |
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