CN104361228A - New method for calculating terrestrial heat resource quantity of dry heat rock - Google Patents
New method for calculating terrestrial heat resource quantity of dry heat rock Download PDFInfo
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- CN104361228A CN104361228A CN201410625944.8A CN201410625944A CN104361228A CN 104361228 A CN104361228 A CN 104361228A CN 201410625944 A CN201410625944 A CN 201410625944A CN 104361228 A CN104361228 A CN 104361228A
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Abstract
The invention discloses a new method for calculating terrestrial heat resource quantity of dry heat rock. The method comprises the following steps: 1) confirming a target area boundary and performing dry heat rock terrestrial heat attribute information collection on data collecting sites; 2) utilizing a Thiessen polygon method to divide a target area into a plurality of sub-areas; 3) calculating the terrestrial heat resource quantity of each sub-area and performing summation or quadrature calculation on all the sub-areas, thereby acquiring the terrestrial heat resource quantity in the whole target area. According to the invention, the geographical location information of the terrestrial heat sampling sites is fully utilized, the target area is subjected to unique dividing, and multiple solutions are avoided, so that the evaluation for the terrestrial heat resource quantity in the target area is benefited. A resource-exploiting benefited area is designated according to the method, so that the exploration cost is reduced, the risk in terrestrial heat resource developing is reduced, and the effective development and utilization for terrestrial heat resources are lastly realized.
Description
Technical field
The present invention relates to a kind of new method calculating dry-hot-rock geothermal stock number based on Thiessen polygon method.
Background technology
Underground heat is a kind of energy resource from earth interior, and this comes from the earth itself is one huge " heat reservoir ", contains huge " heat energy ".These " heat " ooze out earth's surface by the earth's crust or oceanic crust, so just there has been underground heat.Geothermal energy resources refer to the renewable heat energy being stored in earth interior, originate from the melting magma of earth interior and the decay of radiomaterial.On long terms, geothermal energy is a kind of clean, regenerative resource, and its DEVELOPMENT PROSPECT is very wide.Come from due to geothermal energy and be stored in underground, therefore by surface conditions, as weather, landforms, runoff etc., affecting less, therefore there is very high stability and security.The application in current geothermal energy a lot of area in the whole world is quite extensive, and development technique is also day by day perfect.
Geothermal energy resources can be divided into hot water type and xeothermic lithotype two kinds by its origin cause of formation and output condition, and wherein, xeothermic lithotype geothermal energy resources have more potentiality to be exploited and prospect with its ubiquity distributed and high heat-storage model.Hot dry rock is a kind of clean renewable geothermal energy resources, and in the past in 40 years, the technology that utilizes of hot dry rock reaches its maturity, and has shown huge value.China's land district area is wide and be located in three macroplate intersections, has good hot dry rock and composes and deposit background.
" hot dry rock " (Hot Dry Rock), from literal upper understanding, it is a kind of hot rock mass not having water or steam, and meanwhile, hot dry rock is also a kind of important geothermal energy resources.Hot dry rock generally buries in the depths apart from 2 ~ 6 kilometers, earth's surface, and its temperature range, between 150 ~ 650 DEG C, belongs to high-temperature geothermal resource (> 150 DEG C).The distribution almost extend over the entire globe of hot dry rock, comprising each continent even in ocean, is a kind of almost ubiquitous resource.Judge whether there is hot dry rock Exploitative potential somewhere, the most obvious mark sees whether geothermic gradient has exception, or whether certain depths, underground (2000 ~ 5000m) temperature reaches more than 150 DEG C.
Dry-hot-rock geothermal Resources calculation is the first step of hot dry rock RESERVE EVALUATION, is also the element task of hot dry rock exploitation.First, dry-hot-rock geothermal Resources calculation has rationality.The stratum of underground is made up of the rock of different lithology, geologic development facts have proved, rock has certain continuity in transverse direction, longitudinal direction, namely rock is spatially continuous distribution at some scale, this provides basis of reality and theoretical foundation for dry-hot-rock geothermal Resources calculation, whether reasonable, the error size of its result of calculation, crucial controlling factor, space scale divide and the resonable degree estimated this also just the present invention attempt the problem that solves.Secondly, how scientific and rational calculating dry-hot-rock geothermal stock number, and then the dry-hot-rock geothermal resource in certain area is assessed, significant to dry-hot-rock geothermal development of resources.One, the stock number in Shi Dui district is had gained some understanding, and the Economic Value Evaluation for the initial stage provides data basis; Its two, be preliminary delineation exploitation dominant area, for dry-hot-rock geothermal development of resources provider to and guarantee.
At present, the computing method of dry-hot-rock geothermal stock number mainly adopt volumetric method, namely dry-hot-rock geothermal total resources Q equal low hole to ooze in (quantity of heat storage ignoring fluid in rock) xeothermic rock medium compose the heat deposited, computing formula is Q=ρ * C*V* (T-T
0), 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, T
0for surface temperature.As can be seen from computing formula, the geothermal energy resources amount that hot dry rock contains depends on the temperature of hot dry rock and the hot physical property of hot dry rock rock.
Can find out, the key variables of dry-hot-rock geothermal Resources calculation comprise the density of hot dry rock, specific heat, volume and the temperature difference with earth's surface.Volume is generally tried to achieve by the product of region area and hot dry rock thickness, and the conventional preparation method of several key variables mainly contains in addition: frequency distribution statistic law, unbiased variance statistics method and 1 ° × 1 ° longitude and latitude grid division statistic law.In probability distribution statistical Fa Shidui district, total data carries out frequency distribution statistics, and to determine the value of each key variables, the geographic position of this method and data collection point has nothing to do, and only relevant with frequency distribution.In unbiased variance statistics Fa Shidui district, the measured data of several key variables carries out simple mean square deviation calculating respectively to obtain representative value, then for calculating, this method and frequency distribution statistic law similar, also have nothing to do with the geographic position of data collection point, and a region only can obtain a representative value.1 ° × 1 ° longitude and latitude grid division statistic law is that selection area is carried out gridding division with 1 ° × 1 ° longitude and latitude, then subregion statistics is carried out, according to the statistics of each subregion, determine the value of each key variables and the method for calculating, the method considers the geographic position of data collection point to a certain extent, but carry out the method divided with regular fictitious graticule, still isolate the positive connection between dry-hot-rock geothermal stock number in data collection point geographic position and region.
Summary of the invention
For above deficiency, the present invention aims to provide a kind of new dry-hot-rock geothermal Resources calculation method, and it carries out classifying rationally by Thiessen polygon method to target area based on data collection point geographic position, calculates dry-hot-rock geothermal stock number in target area according to this.
To achieve these goals, the technical scheme that the present invention takes is:
A new dry-hot-rock geothermal Resources calculation method, it comprises the following steps:
Step 1, determine target area boundaries and geothermal behavior information acquisition is carried out to data collection point, obtain border figure;
Step 2, utilize Thiessen polygon method that described target area is divided multiple subregion, it comprises the following steps:
Step 21, based on border figure and data collection point, draw moral labor Triangle ID net, to guarantee the uniqueness of triangle gridding; Described moral labor Triangle ID net is made up of a series of oxygon, and each oxygon forms the sub-triangle of moral labor Triangle ID net;
Step 22, utilize drawing, try to achieve every sub-circumcentre of a triangle in moral labor Triangle ID net;
Step 23, adjacent sub-circumcentre of a triangle straight lines all in target area boundaries to be connected, form Thiessen polygon, complete the classifying rationally to target area; The outer boundary of described Thiessen polygon is target area boundaries, its inside forms and complete parttion target area scope by multiple sub-polygon is adjacent, surround a unique data collection point in each sub-polygon, it is the subregion of this target area that every sub-polygon forms region;
The calculating of geothermal energy resources amount in step 3, target area, it comprises the following steps:
Step 31, calculate the area of every sub regions;
Step 32, the data collection point that surrounds in every sub-polygon are as this sub polygonal monumented point, the hot dry rock thickness data of surveying with this monumented point is representative data, calculate the hot dry rock volume of every sub regions, described hot dry rock volume is the area of this subregion and the product of hot dry rock thickness;
Step 33, the data collection point that surrounds in every sub-polygon are as this sub polygonal monumented point, the dry-hot-rock geothermal attribute data of surveying with this monumented point is representative data, calculate the geothermal energy resources amount of every sub regions, described geothermal behavior data comprise hot dry rock density, hot dry rock specific heat capacity, hot dry rock temperature and surface temperature, and described dry-hot-rock geothermal stock number is the product of 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;
Step 34, the geothermal energy resources gauge completing all subregions to be sued for peace or are quadratured computing to the geothermal energy resources amount of this all subregion, obtain the geothermal energy resources amount in whole Thiessen polygon region, complete and calculate the geothermal energy resources gauge in target area after calculating.
Described step 1 comprises the following steps:
Step 11, carry out field survey and the boundary coordinate in record object region by handhold GPS equipment, to determine the border of whole target area;
Step 12, position according to regional geothermal resource investigation data given data collection point really;
Step 13, by handhold GPS equipment, arrive at corresponding data collection point, the dry-hot-rock geothermal attribute information of each data collection point is gathered, to obtain the dry-hot-rock geothermal attribute data of each data collection point, records the warp of data collection point, latitude coordinate and sea level elevation simultaneously;
The boundary coordinate that step 14, arrangement step 11 record also is organized into form document the data acquisition point coordinate that step 13 records;
Step 15, utilize Geographic Information System (GIS) software, boundary coordinate is generated boundary graph shape file, described form document is imported in Geographic Information System (GIS) software, generate data collection point graphic file.
Described boundary graph shape file and data collection point graphic file are standard shp form.
The dry-hot-rock geothermal attribute information that described form document comprises data collection point numbering, data collection point title, data collection point longitude coordinate, data collection point latitude coordinate, data collection point sea level elevation, data collection point record on the spot, described dry-hot-rock geothermal attribute information comprises name of the information and numerical value corresponding to this name of the information.Name of the information comprises the title of hot dry rock density, hot dry rock specific heat capacity, hot dry rock temperature and surface temperature four parameters.
Compared with prior art, the invention has the advantages that:
1, according to data collection point geographical location information, target area is divided first.
Data collection point is important subsurface information sample, and its core meaning is, when underground hot dry rock continuous distribution, the place more close with geographic position, collection point, the value difference that its actual geothermal behavior information and collection point are surveyed is apart from less.In other words, the data collection point being important mark with geographical location information can represent the geothermal behavior data in certain geographic range accurately.Therefore, abandon and calculated the method for geothermal energy resources amount (based on the method for fixing 1 ° × 1 ° fictitious graticule division target area by statistic law determination mean parameter in the past, final also by statistic law determination grid intrinsic parameter value), adopt and based on data collection point geographic position, sub-zone dividing is carried out to target area there is reliable theoretical foundation and realistic meaning.
2, division methods has rationality.
Thiessen polygon method has a lot of good characteristic in neighbor analysis: 1. only contain a discrete points data in each Thiessen polygon; 2. nearest to corresponding discrete point of the point in Thiessen polygon; 3. the point be positioned on Thiessen polygon limit is equal to the distance of the discrete point on its both sides.The present invention makes full use of these good characteristics, with the geographic position of discrete data collection point for foundation classifying rationally target area is multiple subregion, by discrete data sampling number according to connecting with whole target area dry-hot-rock geothermal Resources calculation, there is sufficient theoretical foundation and realistic meaning.
3, division methods has uniqueness.
Sub-zone dividing only has rationality not enough, needs to consider another key issue---and whether the division in region is unique, otherwise may cause the uncontrollable error of calculation between different demarcation mode.In the structure of Thiessen polygon, first discrete point will be formed the triangulation network, this triangulation network is called moral labor Triangle ID net (DelaunayTriangulation).It and Thiessen polygon are bigraph relations.For given initial point set P, there is multiple triangulation network partition patterns, if meet following characteristics, be then called as moral labor Triangle ID net: 1. the outer boundary of the triangulation network constitutes the convex polygon " shell " of point set P; 2. inner at leg-of-mutton circumscribed circle without any point; If 3. ascending order arrangement is carried out at each leg-of-mutton minimum angle in the triangulation network, the numerical value that the arrangement of the triangulation network obtains is maximum.In this sense, moral labor Triangle ID net be " closest to regularization " the triangulation network.No matter a key property of moral labor interior triangular net is exactly network forming from where, region, finally all will obtain consistent result, namely network forming has uniqueness.According to the character of bigraph, the uniqueness of moral labor Triangle ID net means that Thiessen polygon division also has uniqueness.
Accompanying drawing explanation
Fig. 1 is that (wherein (a) is border and data collection point to Thiessen polygon method Region dividing schematic diagram; B () is the moral labor Triangle ID net formed for summit with each data collection point; C () for form Thiessen polygon on moral labor Triangle ID net basis; D () is the Thiessen polygon division result to region);
Fig. 2 is the border (for Inner Mongolia Autonomous Region) of target area;
Fig. 3 is border and the data collection point (for Inner Mongolia Autonomous Region) of target area;
Fig. 4 is that the Thiessen polygon of target area divides (for Inner Mongolia Autonomous Region);
Fig. 5 is the schematic flow sheet of a kind of new dry-hot-rock geothermal Resources calculation method of the present invention.
Embodiment
Below in conjunction with accompanying drawing, specific embodiment of the invention is further described:
Embodiment
Please refer to shown in Fig. 5, a kind of new dry-hot-rock geothermal Resources calculation method, it comprises the following steps:
The determination of 1 target area boundaries and the information acquisition of fixed point geothermal behavior
1.1 by handhold GPS equipment, field survey, record object zone boundary;
1.2 according to regional geothermal resource investigation data, determine data collection point position on the spot;
1.3 by handhold GPS equipment, arrive at the predetermined area, carry out the collection of dry-hot-rock geothermal attribute information (at least comprising the hot dry rock rock density of collection point actual measurement, rock specific heat capacity, depth of stratum and temperature), record, and be organized into " * * area dry-hot-rock geothermal AIT ", record collection point warp, latitude coordinate and sea level elevation simultaneously;
1.4 arrange boundary coordinate and collection point coordinate, wherein collection point file should arrange as form, and form comprises: dry-hot-rock geothermal attribute information (at least comprising hot dry rock rock density in district, rock specific heat capacity, depth of stratum and the temperature) title that collection point numbering, collection point title, collection point longitude coordinate, collection point latitude coordinate, collection point height above sea level, collection point record on the spot and numerical value;
1.5 utilize Geographic Information System (GIS) software, generate boundary graph shape file boundary.shp (Fig. 2); Import Geographic Information System (GIS) software by arranging the collection point file obtained, generate data collection point graphic file stations.shp (Fig. 3), file layout all adopts standard shp form;
2 utilize Thiessen polygon method that target area is divided into some zonules
2.1 based on border figure and data collection point, draw moral labor Triangle ID net (DelaunayTriangulation), guarantee the uniqueness of triangulation, in addition, it should be noted that, moral labor Triangle ID net is made up of a series of oxygon, and we claim each triangle in the triangulation network to be sub-triangle;
2.2 utilize drawing, try to achieve every sub-circumcentre of a triangle in moral labor Triangle ID net;
Sub-circumcentre of a triangle straight line adjacent in target area boundaries connects by 2.3, and form Thiessen polygon (Thiessen Polygons), complete the classifying rationally to target area, this division has uniqueness.In addition, it should be noted that, the outer boundary of Thiessen polygon is the border of target area, inner being adjoined by multiple sub-polygon (limit number is uncertain) forms and complete parttion target area scope, in each sub-polygon, surround a unique data collection point (Fig. 4);
The calculating of geothermal energy resources amount in 3rd district
3.1 in view of the division in aforementioned 2.3, and region is divided into multiple sub-polygonal region by Thiessen polygon, and every sub-polygonal region forms the subregion of Thiessen polygon also i.e. target area, calculates the area of every sub regions;
3.2 in view of the division in aforementioned 2.3, region is divided into multiple sub-polygonal region by Thiessen polygon, unique collection point is had in every sub-polygonal region, take data collection point as the polygonal monumented point of son, the hot dry rock thickness data recorded with this point is for representative data, calculate the volume of every sub regions hot dry rock, computing method are that the area obtained in 3.1 is multiplied by hot dry rock thickness;
3.3 in view of the division in aforementioned 2.3, region is divided into multiple sub-polygonal region by Thiessen polygon, unique collection point is had in every sub-polygonal region, take data collection point as the polygonal monumented point of son, the geothermal behavior data of surveying with this point are for representative data, the calculation of geothermal energy resources gauge is carried out to the subregion of this sub-polygon representative, computing method are " hot dry rock density ", " hot dry rock specific heat capacity ", the product of " hot dry rock volume " and " difference of hot dry rock temperature and surface temperature " several numerical value, wherein, " hot dry rock density ", " hot dry rock specific heat capacity ", " hot dry rock temperature ", " surface temperature " records on the spot by 1.3, " hot dry rock volume " tries to achieve by 3.2,
3.4 calculating completing every sub regions, to result summation or quadrature, obtain the geothermal energy resources amount in whole region, the geothermal energy resources gauge completed in target area is calculated.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1. a new dry-hot-rock geothermal Resources calculation method, it is characterized in that, it comprises the following steps:
Step 1, determine target area boundaries, obtain border figure, and the collection of dry-hot-rock geothermal attribute information is carried out to data collection points all in target area, obtain the dry-hot-rock geothermal attribute data of data collection point;
Step 2, utilize Thiessen polygon method that described target area is divided multiple subregion, it comprises the following steps:
Step 21, based on border figure and data collection point, draw moral labor Triangle ID net, to guarantee the uniqueness of triangle gridding; Described moral labor Triangle ID net is made up of a series of oxygon, and each oxygon forms the sub-triangle of moral labor Triangle ID net;
Step 22, utilize drawing, try to achieve every sub-circumcentre of a triangle in moral labor Triangle ID net;
Step 23, adjacent sub-circumcentre of a triangle straight lines all in target area boundaries to be connected, form Thiessen polygon, complete the classifying rationally to target area; The outer boundary of described Thiessen polygon is target area boundaries, its inside forms and complete parttion target area scope by multiple sub-polygon is adjacent, surround a unique data collection point in each sub-polygon, it is the subregion of this target area that every sub-polygon forms region;
The calculating of geothermal energy resources amount in step 3, target area, it comprises the following steps:
Step 31, calculate the area of every sub regions;
Step 32, the data collection point that surrounds in every sub-polygon are as this sub polygonal monumented point, the hot dry rock thickness data of surveying with this monumented point is representative data, calculate the hot dry rock volume of every sub regions, described hot dry rock volume is the area of this subregion and the product of hot dry rock thickness;
Step 33, the data collection point that surrounds in every sub-polygon are as this sub polygonal monumented point, the dry-hot-rock geothermal attribute data of surveying with this monumented point is representative data, calculate the geothermal energy resources amount of every sub regions, described geothermal behavior data comprise hot dry rock density, hot dry rock specific heat capacity, hot dry rock temperature and surface temperature, and described dry-hot-rock geothermal stock number is the product of 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;
Step 34, the geothermal energy resources gauge completing all subregions to be sued for peace or are quadratured computing to the geothermal energy resources amount of this all subregion, obtain the geothermal energy resources amount in whole Thiessen polygon region, complete and calculate the geothermal energy resources gauge in target area after calculating.
2. new dry-hot-rock geothermal Resources calculation method according to claim 1, it is characterized in that, described step 1 comprises the following steps:
Step 11, carry out field survey and the boundary coordinate in record object region by handhold GPS equipment, to determine the border of whole target area;
Step 12, position according to regional geothermal resource investigation data given data collection point really;
Step 13, by handhold GPS equipment, arrive at corresponding data collection point, the dry-hot-rock geothermal attribute information of each data collection point is gathered, to obtain the dry-hot-rock geothermal attribute data of each data collection point, records the warp of data collection point, latitude coordinate and sea level elevation simultaneously;
The boundary coordinate that step 14, arrangement step 11 record also is organized into form document the data acquisition point coordinate that step 13 records;
Step 15, utilize Geographic Information System (GIS) software, boundary coordinate is generated boundary graph shape file, described form document is imported in Geographic Information System (GIS) software, generate data collection point graphic file.
3. new dry-hot-rock geothermal Resources calculation method according to claim 2, it is characterized in that, described boundary graph shape file and data collection point graphic file are standard shp form.
4. new dry-hot-rock geothermal Resources calculation method according to claim 2, it is characterized in that, the dry-hot-rock geothermal attribute information that described form document comprises data collection point numbering, data collection point title, data collection point longitude coordinate, data collection point latitude coordinate, data collection point sea level elevation, data collection point record on the spot, described dry-hot-rock geothermal attribute information comprises name of the information and numerical value corresponding to this name of the information.
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