CN109598049B - Method for drilling rock fracture development degree and regional rock fracture development rule - Google Patents
Method for drilling rock fracture development degree and regional rock fracture development rule Download PDFInfo
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- CN109598049B CN109598049B CN201811433767.8A CN201811433767A CN109598049B CN 109598049 B CN109598049 B CN 109598049B CN 201811433767 A CN201811433767 A CN 201811433767A CN 109598049 B CN109598049 B CN 109598049B
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Abstract
The invention relates to the technical field of geological exploration, and discloses a method for the development degree of rock cracks of a drilled hole and the development rule of rock cracks in an area, which comprises the steps of collecting logging data of the drilled hole; calculating RQD values of all drill holes in each turn; according to the rock quality classification table, performing rock quality grade division and judging the rock quality grade of each turn; obtaining the rock fracture development degree of each complete drill hole according to a rock fracture development degree equation of the whole drill hole; counting the results of the calculation of the development degrees of all the rock fractures of the drill hole, and generating a contour map by using a drawing software by using an interpolation method; analyzing the development degree of each drill hole rock fracture according to the classification table of the rock fracture degree of the drill hole; and analyzing the development rule of the regional rock fracture based on the drawn contour map and the analysis of the development degree of the rock fracture of each drill hole. The method has the advantage that the rock fracture development degree of the whole drill hole and the regional rock fracture development rule can be accurately analyzed.
Description
Technical Field
The invention relates to the technical field of geological exploration, in particular to a method for the development degree of a rock fracture of a drill hole and the development rule of a rock fracture of a region.
Background
RQD is an index for indicating the quality of rock, and can indirectly reflect the development degree of rock fracture in each drilling cycle: the better the fracture developed, the lower the rock quality grade, the smaller the RQD value. However, the RQD value can only reflect the fracture development degree in each drilling round, and the number of drilling rounds per drill hole is often large, which does not reflect the fracture development degree of the whole drill hole and the fracture development rule of the region, and a method for calculating the rock fracture development degree of the whole drill hole by using the RQD value of the drilling rounds and a method for analyzing the rock fracture development rule of the region by using the RQD value are not available at present.
Disclosure of Invention
Technical problem to be solved
The invention aims to provide a method for calculating the development degree of a rock fracture of a drill hole and the development law of a rock fracture in an area, and the method is used for solving the technical problem that the development degree of the fracture of the whole drill hole and the development law of the fracture in the area cannot be accurately calculated based on a recurrent RQD value in the prior art.
(II) technical scheme
In order to solve the technical problems, the invention provides a method for drilling rock fracture development degree and regional rock fracture development law, which comprises the following steps: step S1, collecting drilling record data; s2, counting RQD values of all drill holes in each turn; s3, dividing rock quality grades according to the rock quality classification table, and preliminarily judging the rock quality grades of each turn; s4, solving the rock fracture development degree of each complete drill hole according to a rock fracture development degree equation of the whole drill hole; s5, counting the results of the calculation of the rock fracture development degrees of all the drill holes, putting the rock fracture development degree values of the whole drill hole into drawing software according to the actual coordinate positions of the respective drill holes, and generating a contour map by the drawing software by utilizing an interpolation method; s6, analyzing the development degree of each drill hole rock fracture according to the classification table of the rock fracture degree of the drill hole; and S7, analyzing the development rule of the regional rock fracture based on the drawn contour map and the analysis of the development degree of the rock fracture of each drill hole.
Wherein the step S4 includes: the rock fracture development degree equation of the whole drilling hole is as follows:
wherein, P f The extent (%) of rock fracture development for the entire borehole; RQD i RQD value (%) for the ith round in the drilled bedrock section; l is a radical of an alcohol i The footage of the ith round in the drilling bedrock part; l is a radical of an alcohol s The total footage length of the whole drilling bedrock part; n is the total number of matrix sections in the entire borehole.
Wherein, in the step S1, the collecting drilling record data comprises: drilling original class report forms, geological drilling hole record tables, hydrogeological hole record tables, hole quality acceptance tables and hole distribution data.
Wherein, the step S2 further includes: and acquiring the ratio of the sum of the accumulated lengths of all the core sections with the lengths larger than 10cm in the core taken by each drill hole bedrock part in the drill hole bedrock part to the integral footage of the drill hole in the drill hole bedrock part, wherein the ratio is expressed in percentage.
Wherein, in the step S4, the RQD value of each turn in the drilling bedrock part reflects the integrity degree of each turn, the higher the RQD value is, the better the rock quality is, and P is f The lower the value of (c).
Wherein in said step S4, the footage (L) of the next run of relatively low rock quality grade in the entire drill hole bedrock portion i ) And total footage length (L) of the entire borehole bedrock section s ) Ratio of (a) to p f In a direct proportional relationship, the greater the ratio, p f The higher the value of (c).
Wherein, in the step S3, if the RQD value is greater than 90, it indicates that the rock quality grade is good; if said RQD value is between 75 and 90, it indicates a better rock quality grade; if said RQD value is between 50 and 75, then a poor rock quality rating is indicated; if said RQD value is between 25 and 50, indicating a poor rock quality grade; if the RQD value is less than 25, the rock quality grade is extremely poor.
Wherein, in the step S6, if P f If the fracture degree is more than 30, the fracture degree of the drill rock is excellent; if P f Between 20 and 30, this indicates that the degree of borehole rock fracture is good; if P f Between 10 and 20, this indicates that the degree of rock fracture of the borehole is normal; if P f Less than 10 indicates a poor degree of borehole rock fracture.
Wherein, the P is f The higher the value, the higher the degree of development of the borehole rock fracture, the P f The lower the value, the lower the degree of development of the borehole rock fracture.
Wherein a higher value of the contour line constituting the contour map indicates P f The higher the value, the better the fracture development of the rock.
(III) advantageous effects
Compared with the prior art, the method provided by the invention has the following advantages:
in the application, by adopting the method, the development degree of the complete drill hole rock fracture can be analyzed, and the development rule of the regional rock fracture can be analyzed, so that the RQD value can be better and more perfectly utilized, and the method is not limited to the division of the quality grade of the rock in the next drilling. The method can quantify the development degree of the fracture of each drill hole, can carry out more detailed macroscopic analysis on the development rule of the fracture of the region, further assists in analyzing the distribution characteristics of the fracture underground water, assists in determining the favorable section of the fracture underground water exploited by the region, and greatly improves the working efficiency in the research process of the fracture underground water.
Drawings
FIG. 1 is a schematic flow chart illustrating steps of a method for drilling a rock fracture development degree and a regional rock fracture development law according to an embodiment of the present application;
FIG. 2 is a table of rock quality grade classifications involved in a method of drilling rock fracture development degree and regional rock fracture development regularity in accordance with an embodiment of the present application;
FIG. 3 is a diagram illustrating the development regularity of regional rock fractures involved in the method of drilling a hole for the development degree of rock fractures and the development regularity of regional rock fractures according to an embodiment of the present application;
fig. 4 is a classification table of the development degrees of the rock cracks of the drill holes involved in the method for developing the development degrees of the rock cracks of the drill holes and the development regularity of the rock cracks of the regions according to the embodiment of the present application.
Detailed Description
The following detailed description of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1:
as shown in fig. 1 to 4, the present application provides an embodiment of a method for drilling a rock fracture development degree and a rock fracture development law of a region, the method comprising:
step S1, collecting drilling record data;
s2, counting the RQD values of all drill holes in each round;
s3, dividing rock quality grades according to the rock quality classification table, and preliminarily judging the rock quality grades of each turn;
s4, solving the rock fracture development degree of each complete drill hole according to a rock fracture development degree equation of the whole drill hole;
s5, counting the results of the calculation of the rock fracture development degrees of all the drill holes, putting the rock fracture development degree values of the whole drill hole into drawing software according to the actual coordinate positions of the respective drill holes, and generating a contour map by the drawing software by utilizing an interpolation method;
s6, analyzing the development degree of each drill hole rock fracture according to the classification table of the rock fracture degree of the drill hole;
and S7, analyzing the development rule of the regional rock fracture based on the drawn contour map and the analysis of the development degree of the rock fracture of each drill hole. Specifically, in the application, by adopting the method, the development degree of the complete drill hole rock fracture can be analyzed, the development rule of the regional rock fracture can be analyzed, and the RQD value can be better and more perfectly utilized and is not limited to the division of the quality grade of the rock in the next drilling. The method can quantify the fracture development degree of each drill hole, can carry out more detailed macroscopic analysis on the development law of the fractures in the region, further assists in analyzing the distribution characteristics of the fracture underground water in the region, assists in determining the favorable section of the underground water of the fracture mined in the region, and greatly improves the working efficiency in the research process of the fracture underground water.
In a more preferred embodiment of the present application, the step S4 includes: the rock fracture development degree equation of the whole drilling hole is as follows:
wherein, P f The extent (%) of rock fracture development for the entire borehole; RQD i RQD value (%) for the ith pass in the drilled bedrock section; l is i The footage of the ith round in the drilling bedrock part; l is s The total footage length of the whole drilling bedrock part; n is the total number of matrix sections in the entire borehole.
In a preferred embodiment, in the step S1, the collecting the drilling record includes: drilling original class report forms, geological drilling hole record tables, hydrogeological hole record tables, hole quality acceptance tables and hole distribution data.
It should be noted that step S1 of the present application is not limited to the cases listed in the above embodiments, and may be adjusted accordingly according to actual situations.
In a preferred embodiment, the step S2 further comprises: and acquiring the ratio of the sum of the accumulated lengths of all the core sections with the lengths larger than 10cm in the core taken by each drill hole bedrock part and the integral footage of each drill hole bedrock part, wherein the ratio is expressed in percentage.
In a specific embodiment, 30 drill holes are planned in a certain area, and the numbers of the drill holes are respectively ZK 01-ZK 30, wherein the base rock part of the ZK01 drill hole has 120 times, wherein the "time" refers to one operation cycle that the drill tool is completely lifted out of the hole to the ground after the drilling is finished each time the drill tool is lowered to the bottom of the hole. If the first time of drilling the ZK01 bedrock part for 100 cm is drilled, the first time has three core sections with the lengths larger than 10cm, namely 12 cm, 25 cm and 30 cm, the RQD value of the first time is = (12 +25+ 30)/100 =70%, and so on, the RQD values of the remaining 119 times of drilling the ZK01 bedrock part are counted, and the RQD values of each time of drilling each of ZK 02-ZK 30 bedrock parts are counted.
In another preferred embodiment, in this step S4, the RQD value of each round in the drill bedrock section reflects the completeness of each round, the higher the RQD value, the better the rock quality, and P f The lower the value of (c).
In one embodiment, in this step S4, the footage (L) of the pass with the relatively low rock quality grade in the entire drill hole bedrock portion i ) And total footage length (L) of the entire borehole bedrock section s ) Ratio of (a) to p f In a direct proportional relationship, the greater the ratio, p f The higher the value of (c).
The larger the proportion of the footage of the next time with low rock quality grade to the total footage length of the bedrock part of the drill hole in the whole drill hole is, the P is f The larger the value of (c). That is, the RQD values of each round of the entire borehole bedrock portion are subtracted by 1, and the weighted average calculation is performed with the length of each round as a weight. And then, performing weighted average calculation on the RQD values of each turn in each complete drilling hole bedrock part by using the rock fracture development degree equation of the whole drilling hole, thereby obtaining the rock fracture development degree of the whole drilling hole.
In a preferred embodiment, as shown in fig. 2, in step S3, if the RQD value is greater than 90, it indicates a good rock quality rating.
If the RQD value is between 75 and 90, it indicates a better rock quality grade.
If the RQD value is between 50 and 75, it indicates a poor rock quality grade.
If the RQD value is between 25 and 50, it indicates a poor rock quality grade.
If the RQD value is less than 25, the rock quality grade is extremely poor.
It should be noted that the RQD values of each round of statistics are compared with the range of RQD values in the classification table of rock quality grades, so as to accurately obtain the rock quality grades.
As shown in fig. 4, in the present applicationIn a preferred embodiment, in step S6, if P is f Greater than 30 indicates that the degree of rock fracture of the drilled hole is excellent.
If P f Between 20 and 30, this indicates that the degree of rock fracture of the drilled hole is good.
If P f Between 10 and 20, the degree of rock fracture of the drilled hole is indicated as normal.
If P f Less than 10 indicates a poor degree of rock fracture in the borehole.
That is, P can be obtained based on the rock fracture development degree equation of the whole drilling hole f Value of by adding P to f Value and P in FIG. 4 f The range of the rock fracture is compared, so that the current rock fracture degree of the drilled hole can be accurately determined.
In a preferred embodiment, the P f The higher the value, the higher the development of the crack, the P f The lower the value, the lower the extent of development of the crack.
In another preferred embodiment, in the contour map, the higher the contour values comprising the contour map, the higher P is indicated f The higher the value, the better the fracture development of the rock.
It should be further noted that the method for analyzing the development rule of the regional rock fracture specifically comprises the following steps:
according to P in FIG. 4 f The classification can clearly be seen: p is f The higher the value is, the higher the fracture development degree of the rock is; in contrast, P f The lower the value, the lower the extent of fracture development of the rock. In this relationship, corresponding to fig. 3, it can be seen intuitively that: the higher the contour value in the contour map, P f The value is higher and higher, and the crack development degree is higher and higher. According to fig. 3, the situation of the development distribution and change law of the rock fractures on the area can be macroscopically seen.
Namely, the method can accurately analyze the development degree of the complete drill hole rock fracture and the development rule of the regional rock fracture.
In addition, on the basis of the method, the method can also be used for assisting in analyzing the distribution characteristics of the fractured underground water and determining the favorable section of the fractured underground water for the area exploitation. It is noteworthy that to fully determine the distribution characteristics of the fracture groundwater and the advantageous section of the area to recover the fracture groundwater, a combination of other means must be used, which is determined primarily by the complexity of the subterranean space and the formation conditions of the fracture groundwater. The method requires the investigation of the topographic and topographic characteristics (influencing the motion law of fracture groundwater) and meteorological hydrological characteristics (atmospheric precipitation is an important source of groundwater planar replenishment and influencing the groundwater water quantity), the development conditions of folds and fractures (folds influence the motion and enrichment law of fracture groundwater; the development degree of rock fractures is usually high near fractures, but fractures can guide water and block water, and the scale and the property need to be checked), the lithology of strata (influencing the enrichment and the permeation of fracture groundwater), the type of groundwater, the distribution condition of aquifer, the radius-supplementing and drainage law of groundwater (the replenishment, the runoff and drainage law of fracture groundwater), the water-rich property of aquifer and the like.
Therefore, on the basis of analyzing the development degree of the complete drilling rock fracture and the development rule of the regional rock fracture, the method can be combined with data collection (collecting the topographic features, meteorological hydrology, regional geology, hydrogeology and other data of a research region to analyze the topographic features, the meteorological hydrological features, the wrinkle and fracture development conditions, the stratum lithology, the underground water type, the aquifer distribution conditions, the underground water path filling and drainage rule and the like), ground investigation (field survey), geophysical prospecting (analyzing the underground water distribution and aquifer distribution conditions on the vertical plane and the fracture development conditions by using a high-density resistivity method, an induced polarization method and other methods), drilling disclosure (determining the change of the stratum lithology on the vertical direction, finding the aquifer water level and distribution conditions), tests (calculating hydrogeological parameters by using a water pumping test and determining the aquifer water-rich property), and the like.
In conclusion, in the application, by adopting the method, the development degree of the complete drill hole rock fracture and the development rule of the regional rock fracture can be analyzed, so that the RQD value can be better and more perfectly utilized, and the method is not limited to the division of the quality grade of the rock in the next drilling. The method can quantify the fracture development degree of each drill hole, can carry out more detailed macroscopic analysis on the development law of the fractures in the region, further assists in analyzing the distribution characteristics of the underground water of the fractures, assists in determining the favorable section of the underground water of the fractures exploited in the region, and greatly improves the working efficiency in the research process of the underground water of the fractures.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention, which is intended to cover any modifications, equivalents, improvements, etc. within the spirit and scope of the present invention.
Claims (9)
1. A method for drilling rock fracture development degree and regional rock fracture development law is characterized by comprising the following steps:
step S1, collecting drilling record data;
s2, counting the RQD values of all drill holes in each round;
s3, dividing rock quality grades according to the rock quality classification table, and preliminarily judging the rock quality grades of each turn;
s4, solving the rock fracture development degree of each complete drill hole according to a rock fracture development degree equation of the whole drill hole, wherein the rock fracture development degree equation of the whole drill hole is as follows:
wherein, P f The extent (%) of rock fracture development for the entire borehole; RQD i RQD value (%) for the ith pass in the drilled bedrock section; l is a radical of an alcohol i The footage of the ith round in the drilling bedrock part; l is a radical of an alcohol s Total footage length for the entire drilled bedrock section; n is the total number of times of the bedrock part of the whole drilling hole;
s5, counting the results of the calculation of the rock fracture development degrees of all the drill holes, putting the rock fracture development degree values of the whole drill hole into drawing software according to the actual coordinate positions of the respective drill holes, and generating a contour map by the drawing software by utilizing an interpolation method;
s6, analyzing the development degree of each drill hole rock fracture according to the classification table of the rock fracture degree of the drill hole;
and S7, analyzing the development rule of the regional rock fracture based on the drawn contour map and the analysis of the development degree of the rock fracture of each drill hole.
2. The method of claim 1, wherein in step S1, the collecting borehole chronicle comprises: drilling original class report forms, geological drilling hole record tables, hydrogeological hole record tables, hole quality acceptance tables and hole distribution data.
3. The method according to claim 1, wherein the step S2 further comprises: and acquiring the ratio of the sum of the accumulated lengths of all the core sections with the lengths larger than 10cm in the core taken by each drill hole bedrock part in the drill hole bedrock part to the integral footage of the drill hole in the drill hole bedrock part, wherein the ratio is expressed in percentage.
4. A method according to claim 1, wherein in step S4, the RQD value of each pass in the drill bedrock section reflects the completeness of each pass, the higher the RQD value the better the rock quality, and P f The lower the value of (c).
5. Method according to claim 1, characterized in that in step S4 the length of penetration (L) of the relatively low grade of rock quality pass in the entire drill hole bedrock portion i ) And total footage length (L) of the entire borehole bedrock section s ) Ratio of (a) to p f In a direct proportional relationship, the larger the ratio, p f The higher the value of (c).
6. The method according to claim 1, characterized in that in said step S3, if said RQD value is greater than 90, it indicates a good rock quality grade;
if the RQD value is between 75 and 90, the rock quality grade is better;
if said RQD value is between 50 and 75, then a poor rock quality rating is indicated;
if said RQD value is between 25 and 50, indicating a poor rock quality grade;
if the RQD value is less than 25, the rock quality grade is extremely poor.
7. The method according to claim 1, wherein in step S6, if P is f If the fracture degree is more than 30, the fracture degree of the drill rock is excellent;
if P f Between 20 and 30, this indicates that the degree of rock fracture of the drilled hole is good;
if P f Between 10 and 20, this indicates that the degree of rock fracture of the borehole is normal;
if P f Less than 10 indicates a poor degree of borehole rock fracture.
8. The method of claim 1, wherein P is P f The higher the value, the higher the degree of development of the borehole rock fracture, the P f The lower the value, the lower the extent of development of the borehole rock fracture.
9. The method of claim 1, wherein a higher value of the contour lines comprising the contour map indicates P in the contour map f The higher the value, the better the fracture development of the rock.
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| CN106522243A (en) * | 2016-10-18 | 2017-03-22 | 中铁局集团有限公司 | Fissure-contained rock soil stratum prestressed anchor cable grouting and anchoring construction method |
| CN106896401A (en) * | 2017-03-01 | 2017-06-27 | 安徽理工大学 | A kind of log inversion method of study of rocks characteristics of fracture development |
| CN106932835A (en) * | 2017-04-13 | 2017-07-07 | 安徽理工大学 | A kind of rock fracture development degree analysis method based on RQD values |
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| RU2661489C1 (en) * | 2017-09-06 | 2018-07-17 | Общество с ограниченной ответственностью "ЛУКОЙЛ-Инжиниринг" (ООО "ЛУКОЙЛ-Инжиниринг") | Method of integrating initial data to update filtration structure of non-uniform carbonate reservoirs |
| CN108343431B (en) * | 2018-02-08 | 2021-07-06 | 济南大学 | Method for exploring flow network of bedrock fracture underground water system |
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| CN106522243A (en) * | 2016-10-18 | 2017-03-22 | 中铁局集团有限公司 | Fissure-contained rock soil stratum prestressed anchor cable grouting and anchoring construction method |
| CN106896401A (en) * | 2017-03-01 | 2017-06-27 | 安徽理工大学 | A kind of log inversion method of study of rocks characteristics of fracture development |
| CN106932835A (en) * | 2017-04-13 | 2017-07-07 | 安徽理工大学 | A kind of rock fracture development degree analysis method based on RQD values |
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