CN109726374B - Method for establishing hydrothermal geothermal well water temperature depth chart and application method - Google Patents
Method for establishing hydrothermal geothermal well water temperature depth chart and application method Download PDFInfo
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- CN109726374B CN109726374B CN201711052735.9A CN201711052735A CN109726374B CN 109726374 B CN109726374 B CN 109726374B CN 201711052735 A CN201711052735 A CN 201711052735A CN 109726374 B CN109726374 B CN 109726374B
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Abstract
The invention discloses a method for establishing a hydrothermal geothermal well water temperature depth chart and an application method thereof, wherein the establishment method comprises the following steps: establishing a two-dimensional rectangular coordinate system, wherein the abscissa represents variation of water temperature of the exploratory well, and the ordinate represents variation of depth of a water producing section of the exploratory well; forming a water temperature depth scatter diagram in the two-dimensional rectangular coordinate system based on the relation between the successful well exploration water testing temperature of the geothermal field and the depth of a water producing section; marking two straight lines with the same slope in a water temperature depth scatter diagram in the two-dimensional rectangular coordinate system; and dividing the water temperature depth scatter diagram into three areas by taking the two straight lines as boundaries. The chart can be widely applied to the exploration and evaluation process of the geothermal field, the temperature of the geothermal field can be conveniently and rapidly known, and manpower and material resources are saved. The method improves the rapidness and scientificity of the evaluation of the relation of the water temperature and the depth of the geothermal heat Tian Tanjing, and enables the evaluation result to have reference value.
Description
Technical Field
The invention belongs to the field of geothermal geology, and particularly relates to a hydrothermal geothermal field exploration well water temperature and water production section depth discrimination model, namely establishment and application of a hydrothermal geothermal well water temperature depth chart.
Background
At present, domestic hydrothermal geothermal resources develop rapidly as clean heating energy, but generally, the general and effective judgment on whether the water temperature depth interval of a geothermal exploratory well is in an available normal range is lacked, generally, the calculation is carried out according to the geothermal gradient of the structure position of the exploratory well, as the geothermal geological structure is complex, the factors influencing the geothermal water temperature are more, for the temperature value which is not in accordance with the predicted geothermal gradient, the analysis of various related geological factors is required, so that the reason that whether the water temperature of the exploratory well belongs to the normal range or the temperature is abnormal can not be rapidly judged, the exploratory well of the geothermal field of each different structure unit needs to be judged again, the geothermal gradient of each structure unit is different, and the water temperatures of different exploratory wells are not strong in comparability.
Disclosure of Invention
The invention aims to solve the problems of quick judgment of whether the water temperature is normal or not and judgment of abnormal reasons, including temperature higher than an estimated geothermal gradient or lower than an estimated geothermal gradient value, under the condition that the water producing layer depth of geothermal Tian Tanjing is determined in the prior art.
Aiming at the problems in the prior art, the invention provides a method for establishing a geothermal field exploration well water temperature-water production section depth interval change reason analysis chart and application thereof.
According to one aspect of the invention, a method for establishing a hydrothermal geothermal well water temperature depth chart is provided, which comprises the following steps:
establishing a two-dimensional rectangular coordinate system, wherein the horizontal coordinate represents variation of water temperature of the exploratory well, and the vertical coordinate represents variation of depth of a water producing section of the exploratory well;
forming a water temperature depth scatter diagram in the two-dimensional rectangular coordinate system based on the relation between the successful well exploration water testing temperature of the geothermal field and the depth of a water producing section;
marking two straight lines with the same slope in a water temperature depth scatter diagram in the two-dimensional rectangular coordinate system;
and dividing the water temperature depth scatter diagram into three areas by taking the two straight lines as boundaries.
Furthermore, the interval between the two straight lines is a normal temperature change interval along with the water production depth; the upper right of the line with larger intercept is an abnormal high temperature zone, and the lower left of the line with smaller intercept is an abnormal low temperature zone.
Furthermore, according to the temperature change and the depth change of different water producing sections in the two-dimensional rectangular coordinate system, the maximum temperature and the minimum temperature measured by the same water producing section depth are taken as conditions, and two straight lines with the same slope are calibrated.
Furthermore, temperature data are calibrated through water testing work of the exploratory well, and depth data of the water producing section of the exploratory well are calibrated according to the depth intermediate value of the water producing section of the exploratory well.
And further, putting the water testing temperature and the water production interval depth data of the successful well exploration of the plurality of hydrothermal geothermal fields into the two-dimensional rectangular coordinate system, and performing partition classification on the water temperature change reasons of the plurality of hydrothermal geothermal fields.
Further, if the water testing temperature-water production depth point of the newly-dug exploration well is located in a normal change interval, the exploration well belongs to a normal geothermal gradient area;
if the water testing temperature-water production depth point of the newly dug exploration well is positioned in the abnormal high-temperature area, the exploration well is an abnormal high-temperature thermal fluid affected area;
and if the water testing temperature-water production depth point of the newly dug exploration well is positioned in the abnormal low-temperature area, the exploration well is the abnormal low-temperature fluid influence area.
Further, the abscissa is in degrees celsius and the ordinate is in meters.
According to another aspect of the present invention, there is provided a method of using a hydrothermal geothermal well water temperature depth plate, comprising the steps of:
putting the water testing temperature and the water producing interval depth data of the successful well exploration of the plurality of geothermal fields into the two-dimensional rectangular coordinate system;
if the water testing temperature-water production depth point of the newly-dug exploration well is positioned in a normal change interval, the exploration well belongs to a normal geothermal gradient area;
if the water testing temperature-water production depth point of the newly dug exploration well is positioned in the abnormal high-temperature area, the exploration well is an abnormal high-temperature thermal fluid affected area;
and if the water testing temperature-water production depth point of the newly dug exploration well is positioned in the abnormal low-temperature area, the exploration well is the abnormal low-temperature fluid influence area.
The method is based on a geothermal Tian Tanjing water temperature and water production section depth change scatter diagram, a plurality of geothermal Tian Tanjing water temperatures and water production section depth change data are put into a two-dimensional rectangular coordinate system, and a plurality of hydrothermal geothermal field water temperature change reasons are classified in a partition mode. The geothermal Tian Tanjing water temperature change reason analysis chart is mainly divided into a normal interval and an abnormal interval, the abnormal interval can be divided into an abnormal high-temperature interval and an abnormal geothermal interval, and the chart expresses main factors of water temperature change of exploratory wells in different hydrothermal geothermal field exploration processes in a concise and concise manner. The chart can not only quickly analyze the main factors of the water temperature change of each geothermal heat Tian Tanjing, but also qualitatively evaluate the geothermal field represented by the exploratory well. The chart can be widely applied to the exploration and evaluation process of the geothermal field, the temperature of the geothermal field can be conveniently and rapidly known, and manpower and material resources are saved.
The method improves the rapidness and scientificity of the evaluation of the relation of the water temperature and the depth of the geothermal heat Tian Tanjing, and enables the evaluation result to have reference value.
Drawings
The above and other objects, features and advantages of the present disclosure will become more apparent by describing in greater detail exemplary embodiments thereof with reference to the attached drawings, in which like reference numerals generally represent like parts throughout.
FIG. 1 is a schematic diagram of a water temperature and water producing section depth variation reason analysis chart of the geothermal well exploration well according to the invention.
FIG. 2 is a schematic diagram of the application of the analysis chart of the cause of the change of the water temperature and the water production section depth of the geothermal well exploration well.
FIG. 3 is a flow chart of a method of creating a water temperature depth map for a hydrothermal geothermal well according to the present invention.
Detailed Description
Preferred embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While the preferred embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
The invention discloses a method for establishing a hydrothermal geothermal well water temperature depth change reason analysis chart and application thereof. According to the temperature change and the change of different water producing sections in the coordinate system, the maximum temperature and the minimum temperature measured by the same water producing depth are taken as conditions, two straight lines with the same slope are calibrated, and the research area is divided into three areas by taking the two straight lines as boundaries. The interval between the two straight lines is a normal temperature change interval along with the water production depth, the upper right of the straight line with larger intercept is an abnormal high-temperature area, and the lower left of the straight line with smaller intercept is an abnormal low-temperature area.
As shown in fig. 3, a method for creating a water temperature depth map of a hydrothermal geothermal well is provided, which comprises the following steps:
establishing a two-dimensional rectangular coordinate system, wherein the horizontal coordinate represents variation of water temperature of the exploratory well, and the vertical coordinate represents variation of depth of a water producing section of the exploratory well;
forming a water temperature depth scatter diagram in the two-dimensional rectangular coordinate system based on the relation between the successful well exploration water testing temperature of the geothermal field and the depth of a water producing section;
calibrating two straight lines with the same slope on the condition of the maximum temperature and the minimum temperature measured by the same water producing section depth in a water temperature depth scatter diagram in the two-dimensional rectangular coordinate system; and dividing the water temperature depth scatter diagram into three areas by taking the two straight lines as boundaries.
Specifically, a two-dimensional rectangular coordinate system is established, wherein the abscissa of the rectangular coordinate system represents the variation of water temperature of the exploratory well, the unit of the horizontal coordinate system is centigrade, the ordinate of the rectangular coordinate system represents the variation of depth of a water producing section of the exploratory well, and the unit of the vertical coordinate system is meter, and the depth of the water producing section is based on the middle value of the water producing section.
Temperature data are calibrated through water testing work of the exploratory well, and depth data of the water producing section of the exploratory well are calibrated according to the depth of the water producing section of the exploratory well. And (4) a scatter diagram based on the relation between the well-exploring water testing temperature and the water producing section depth of the geothermal field.
And then, calibrating two straight lines with the same slope under the condition of the maximum temperature and the minimum temperature measured at the same water producing depth according to the temperature change and the change of different water producing sections in the coordinate system.
And finally, dividing the research area into three areas by taking the two straight lines as boundaries, wherein the area between the two straight lines is an area I with the temperature normally changing along with the water production depth. The right upper part of the straight line with larger intercept is a high temperature area and a II area, and the left lower part of the straight line with smaller intercept is a low temperature area and a III area.
According to another aspect of the present invention, there is provided a method of using a hydrothermal geothermal well water temperature depth plate, comprising the steps of:
putting the water testing temperature and the water producing interval depth data of the successful well exploration of the plurality of geothermal fields into the two-dimensional rectangular coordinate system;
if the water testing temperature-water production depth point of the newly-dug exploration well is positioned in a normal change interval, the exploration well belongs to a normal geothermal gradient area;
if the water testing temperature-water production depth point of the newly dug exploration well is positioned in the abnormal high-temperature area, the exploration well is an abnormal high-temperature thermal fluid affected area;
and if the water testing temperature-water production depth point of the newly dug exploration well is positioned in the abnormal low-temperature area, the exploration well is the abnormal low-temperature fluid influence area.
To facilitate understanding of the solution of the embodiments of the present invention and the effects thereof, a specific application example is given below. It will be understood by those skilled in the art that this example is merely for the purpose of facilitating an understanding of the present invention and that any specific details thereof are not intended to limit the invention in any way.
The present invention will be described in detail below with reference to the drawings and examples.
The invention provides a method for establishing a geothermal field exploratory well water temperature and water production section depth change reason analysis chart and application thereof. The method for establishing the geothermal Tian Tanjing water temperature and water production section depth change reason analysis plate comprises the following steps of:
as shown in fig. 1, a two-dimensional rectangular coordinate system is established, wherein the horizontal coordinate represents the variation of the water temperature of the exploratory well, the unit of the temperature is centigrade, the vertical coordinate represents the variation of the depth of the water producing section of the exploratory well, and the unit of the meter is used, and the depth of the water producing section is based on the middle value of the water producing section. Temperature data are calibrated through water testing work of the exploratory well, and exploratory well depth data are calibrated according to the depth intermediate value of the water producing section of the exploratory well. Based on a scatter diagram of the relation between the test water temperature and the water production section depth of the successful well exploration of the geothermal field, the test water temperature and the water production section depth data of the successful well exploration of the geothermal field in the research area are put into a coordinate system (shown by dots in figure 1).
According to the temperature change and the change of different water producing sections in a coordinate system, calibrating two straight lines with the same slope on the condition of measuring the maximum temperature and the minimum temperature at the same water producing depth, dividing a research area into three areas by taking the two straight lines as boundaries, wherein the area between the two straight lines is a normal temperature change area along with the water producing depth and an area I; the right upper part of the straight line with larger intercept is a high temperature area and a II area; the left lower part of the straight line with smaller intercept is a low temperature zone and a zone III.
The area I is a normal temperature change area of the exploratory well, and the water temperature rises along with the deepening of a water producing section; the area II is an abnormal high-temperature area of the exploration well and indicates that the underground water producing section is possibly influenced by high-temperature fluid with higher than normal geothermal gradient; and the area III is an abnormal geological temperature area of the exploration well, when the water volume of the exploration well testing water is obviously low, the temperature is influenced by the water volume and the underground heat cannot be effectively taken out of the shaft, and when the water volume of the testing water is normal and only the water temperature is low, the underground water producing section is possibly communicated with low-temperature water or surface water at a shallow part.
Taking a plurality of geothermal fields Tian Tanjing in a certain area as an example, the method is adopted to establish an exploratory well water temperature and water production section depth change reason analysis chart, and an exploratory well A and an exploratory well B respectively fall in a zone III and a zone II. Geological analysis shows that a water diversion fault is communicated with a surface water system in a target layer of a water production section A of the exploration well, so that the temperature is lower than a normal range; and the target layer of the water producing section of the exploratory well B is communicated with the deep fracture, and the high-temperature hot fluid enters the target layer section along the deep fracture to cause the temperature to be higher than the normal range.
The above embodiments are only used to illustrate the present invention, and the names and units of the variables, the slopes of the partition lines, and the interval divisions in the plate may be changed according to specific data, and all equivalent changes and improvements based on the technical solution of the present invention are within the protection scope of the present invention.
Having described embodiments of the present disclosure, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein was chosen in order to best explain the principles of the embodiments, the practical application, or technical improvements to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (5)
1. A method for establishing a hydrothermal geothermal well water temperature depth chart is characterized by comprising the following steps:
establishing a two-dimensional rectangular coordinate system, wherein the abscissa represents variation of water temperature of the exploratory well, and the ordinate represents variation of depth of a water producing section of the exploratory well;
forming a water temperature depth scatter diagram in the two-dimensional rectangular coordinate system based on the relation between the successful well exploration water testing temperature of the geothermal field and the depth of a water producing section;
marking two straight lines with the same slope in a water temperature depth scatter diagram in the two-dimensional rectangular coordinate system;
dividing the water temperature depth scatter diagram into three areas by taking the two straight lines as boundaries;
and calibrating two straight lines with the same slope on the condition of the maximum temperature and the minimum temperature measured by the same water producing section depth according to the temperature change and the depth change of different water producing sections in the two-dimensional rectangular coordinate system.
2. The method of setting up a water temperature depth map for a hydrothermal geothermal well of claim 1, wherein the interval between the two lines is a normal temperature variation interval with water production depth; the upper right of the line with larger intercept is an abnormal high temperature zone, and the lower left of the line with smaller intercept is an abnormal low temperature zone.
3. The method of claim 1, wherein the temperature data is calibrated by a water logging job of the exploratory well, and the water production section depth data of the exploratory well is calibrated according to the intermediate depth value of the water production section of the exploratory well.
4. The method of creating a hydrothermal geothermal well water temperature depth profile of claim 1, wherein the abscissa is in degrees celsius and the ordinate is in meters.
5. An application method of a hydrothermal geothermal well water temperature depth chart, which is established by applying the establishing method of the hydrothermal geothermal well water temperature depth chart according to any one of claims 1-4, and is characterized by comprising the following steps of:
putting the water testing temperature and the water production interval depth data of the successful well exploration of the plurality of geothermal fields into the two-dimensional rectangular coordinate system, and performing partition classification on the water temperature change reasons of the plurality of hydrothermal geothermal fields;
if the water testing temperature-water production depth point of the newly-dug exploration well is positioned in a normal change interval, the exploration well belongs to a normal geothermal gradient area;
if the water testing temperature-water production depth point of the newly dug exploration well is positioned in the abnormal high-temperature area, the exploration well is an abnormal high-temperature thermal fluid affected area;
and if the water testing temperature-water production depth point of the newly dug exploration well is positioned in the abnormal low-temperature area, the exploration well is the abnormal low-temperature fluid influence area.
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