CN117871822A - Drilling, measuring and analyzing method for in-situ quantification and distinction of deep sea hydrothermal sulfide and surrounding rock - Google Patents
Drilling, measuring and analyzing method for in-situ quantification and distinction of deep sea hydrothermal sulfide and surrounding rock Download PDFInfo
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- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 title claims abstract description 83
- 239000011435 rock Substances 0.000 title claims abstract description 63
- 238000005553 drilling Methods 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 18
- 238000011002 quantification Methods 0.000 title claims abstract description 9
- 238000005259 measurement Methods 0.000 claims abstract description 41
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- 239000000523 sample Substances 0.000 claims description 32
- 230000006698 induction Effects 0.000 claims description 19
- 239000013535 sea water Substances 0.000 claims description 9
- 238000004445 quantitative analysis Methods 0.000 claims description 6
- 238000000691 measurement method Methods 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims description 3
- 238000000611 regression analysis Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 238000004458 analytical method Methods 0.000 abstract description 13
- 229910052500 inorganic mineral Inorganic materials 0.000 description 6
- 239000007788 liquid Substances 0.000 description 6
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- 238000011161 development Methods 0.000 description 3
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- 150000003568 thioethers Chemical class 0.000 description 2
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- 239000011521 glass Substances 0.000 description 1
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- 239000002932 luster Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
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- 238000012876 topography Methods 0.000 description 1
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Abstract
The invention provides a drilling analysis method for in-situ quantification and distinction of deep sea hydrothermal sulfide and surrounding rock, which provides a feasible drilling analysis means to realize the purpose of accurately identifying the distribution situation and the relative content of sulfide and surrounding rock in the whole drilling section. The drilling, measuring and analyzing method for in-situ quantification and distinguishing of deep sea hydrothermal sulfide and surrounding rock comprises the following steps: step 1, drilling and coring are carried out in a sulfide mining area, multi-parameter drilling measurement is carried out, and stratum interval division is carried out from top to bottom according to a measurement curve; step 2, carrying out laboratory physical property test, hierarchical microscope identification and experimental calculation on the core sample; step 3, establishing a distinguishing formula of sulfide and surrounding rock in a laboratory environment; and step 4, taking the average value of the drilling measurement curves of all the layers into the distinguishing formula obtained in the step 3, and calculating the relative content of sulfide and surrounding rock of all the layers of the whole section.
Description
Technical Field
The invention belongs to the field of deep sea hot liquid sulfide resource evaluation and research, and relates to a drilling, measuring and analyzing method for in-situ quantification and distinguishing of deep sea hot liquid sulfide and surrounding rock.
Background
The deep sea hydrothermal sulfide is a metal mineral resource widely distributed in deep sea environments such as a middle ocean ridge, a post-arc basin, an island arc and the like, and has important economic value and development and utilization prospects.
Deep sea hydrothermal sulfide can coexist with surrounding rock below the seabed surface and be mixed to form a stack with a thickness exceeding hundred meters. Because of the poor consolidation of such stacks, drilling coring efficiency is extremely low, often less than 40% and the coring intervals are often discontinuous, resulting in an inability to directly evaluate resource potential with core samples. Based on the reasons, the in-situ physical property measurement of the drill hole is performed, the fitting analysis is performed by combining the laboratory physical property test characteristics of the drill hole core sample, and further, the analysis of the distribution and the relative content of sulfide and surrounding rock in each layer section becomes a necessary way for accurately evaluating the potential of deep sea sulfide resources.
The current drilling work in the deep sea hot liquid sulfide area is less, the drilling measurement work is more pineapple, the related theoretical basis and method for analyzing the mineral content of the drilling rock stratum are still immature, and the accurate cognition and development and utilization preparation work of the scientific community and the industry on the deep sea sulfide resource value is severely restricted. At present, a drilling analysis method for quantitatively distinguishing deep sea hydrothermal sulfide from surrounding rock in situ is needed.
In view of this, the present patent application is specifically filed.
Disclosure of Invention
The invention provides a drilling analysis method for in-situ quantification and distinction of deep sea hydrothermal sulfide and surrounding rock, which aims to solve the problems and requirements of the prior art, and provides a feasible drilling analysis method for accurately identifying the distribution situation and the relative content of sulfide and surrounding rock in the whole drilling section.
In order to achieve the above design purpose, the drilling analysis method for in-situ quantification and separation of deep sea hydrothermal sulfide and surrounding rock comprises the following steps:
step 1, drilling and coring are carried out in a sulfide mining area, multi-parameter drilling measurement is carried out, and stratum interval division is carried out from top to bottom according to a measurement curve;
step 2, carrying out laboratory physical property test, hierarchical microscope identification and experimental calculation on the core sample;
step 3, establishing a distinguishing formula of sulfide and surrounding rock in a laboratory environment;
and step 4, taking the average value of the drilling measurement curves of all the layers into the distinguishing formula obtained in the step 3, and calculating the relative content of sulfide and surrounding rock of all the layers of the whole section.
Further, the step 1 comprises the following steps:
drilling and coring are carried out on the sea bottom surface of the deep sea sulfide mining area;
after the coring is completed, vertically lowering physical property measuring equipment in the center of the drilling hole and starting to perform full-hole section measuring work;
when more measurement curves exist, selecting the most stable curve as a reference to correct the depth range of other curves;
taking the maximum value of the measurement curve and the middle depth value point of the adjacent minimum value of the measurement curve or the middle depth value point of the minimum value of the measurement curve and the adjacent maximum value of the measurement curve as a boundary, and dividing the whole measurement section into a plurality of layers from top to bottom;
further, the step 2 comprises the following steps:
immersing a core sample collected from a deep sea borehole in seawater at the same temperature and pressure as the coring, and performing continuous top-to-bottom physical property test on the core sample;
and after the test is finished, taking out the sample, and carrying out hierarchical microscope identification and experimental calculation on the sample to obtain the relative content value of sulfide and surrounding rock of each layer section.
Further, in the step 2, the laboratory seawater temperature is measured by a temperature probe of a measurement device placed in the drill hole, and the laboratory seawater surface pressure is calculated by a single-beam or multi-beam central beam water depth value of the drill hole bottom surface.
Further, the step 3 comprises the following steps:
based on a multiparameter physical property measurement method, establishing a distinguishing standard of sulfide and surrounding rock in a laboratory environment;
polynomial functional relation exists between the induction resistivity, the sound wave speed and the relative content of sulfide or surrounding rock, polynomial regression analysis is carried out based on the induction resistivity, the sound wave speed and the relative content of sulfide of each layer section measured in the step 2, the following fitting formula is obtained,
P s ＝a n R n +a n-1 R n-1 +···+ a 1 R+a 0 +b n S n +b n-1 S n-1 +···+b 1 S+b 0 (1)
wherein R and S respectively represent the induction resistivity value and the sonic velocity value of a certain stratum interval, a n To a 0 B n To b 0 The coefficient of the polynomial is fitted by the polynomial to obtain a constant value; p is p s Represents the relative percentage of sulfide in a certain interval; p (P) s ＝[0,1]，p s When=1, the whole layer section is sulfide, P s The whole interval is surrounding rock when=0.
Further, the step 4 includes the following steps:
reading curve values corresponding to the depth values in different layers on the physical property detection curve of the drilling section, and calculating the average value of the physical property parameters of each layer;
and (3) taking the calculated average value of the induction resistivity and the sonic velocity of each layer segment into a fitting formula (1) obtained in the step (3) to obtain the relative proportion of sulfide and surrounding rock of each layer segment on the full-section measurement curve of the drilling hole.
In summary, the drilling analysis method for quantitatively distinguishing the deep sea hot-liquid sulfide from the surrounding rock in situ has the advantages of effectively solving the defects of the prior art in quantitatively distinguishing the related theory and method of sulfide and surrounding rock distribution on the longitudinal section of the deep sea hot-liquid sulfide stack, providing a specific and feasible drilling analysis scheme, accurately identifying the distribution and relative content of sulfide and surrounding rock of the whole drilling section, and providing related theoretical basis and technical reference for accurate evaluation, development and utilization of the deep sea hot-liquid sulfide resource quantity.
Drawings
FIG. 1 is a flow chart of a drilling analysis method for in-situ quantification of deep sea hydrothermal sulfide from surrounding rock;
fig. 2 is a schematic diagram of an analysis result using the method described in the present application.
Detailed Description
The invention is further described below with reference to the drawings and examples.
Embodiment 1, the in-situ quantitative analysis method for distinguishing deep sea hydrothermal sulfide from surrounding rock comprises the following implementation steps:
step 1, drilling and coring are carried out in a sulfide mining area, multi-parameter drilling measurement is carried out, and stratum interval division is carried out from top to bottom according to a measurement curve;
selecting a deep sea sulfide mining area sea bottom surface with flat topography, vertically downwards drilling holes by means of a submarine drilling machine, a drilling platform or a drilling ship, and carrying out sample coring;
after the coring is completed, vertically lowering physical property measuring equipment in the center of the drilling hole and starting to perform full-hole section measuring work;
specifically, taking an induction resistivity (in omega-m) and sound wave speed (in mu m/s) measuring device as examples, when the device lowering measuring curve and the lifting measuring curve are different, taking the measuring curve of the device when the device is lifted as a final result; because the acoustic wave measurement is relatively more affected by external interference factors such as small particle sediment, a well wall pore and the like, the depth value of the acoustic wave velocity curve is calibrated to the induction resistivity curve based on a relatively more stable induction resistivity curve, so that the depth ranges of the two measurement curves are kept consistent;
when more measurement curves exist, the most stable curve is selected as a reference to correct the depth range of other curves;
taking the maximum value of the measurement curve and the middle depth value point of the adjacent minimum value of the measurement curve or the minimum value of the measurement curve and the middle depth value point of the adjacent maximum value of the measurement curve as boundaries, and dividing the whole measurement section into a plurality of layers from top to bottom, wherein sulfide and surrounding rock in each layer are uniformly distributed;
the maxima or minima points of the measurement curve are defined by the following formula:
f(x)′＝0
wherein x is the value of the measurement curve;
for example, f (x i ) Is a maximum value, and the corresponding depth is H xi And f (x) i+1 ) A minimum value nearest deeper, the corresponding depth is H xi+1 The depth interface of this interval is then (H) xi +H xi+1 ) 2; similarly, as depth continues to increase, the next maximum value is f (x i+2 ) Corresponding depth is H xi+2 The depth interface of this interval is (H) xi+1 +H xi+2 )/2，(H xi+1 +H xi+2 )/2－(H xi +H xi+1 ) And/2 is the interval between layers, or the thickness, of the layer section;
it should be noted that due to measurement accuracy constraints, intervals having an interval of less than 2cm are not generally considered as separate intervals, but are included in the upper or lower interval, i.e. x i To x i+1 The absolute value of the difference between the depth values should be not less than 2cm;
step 2, carrying out laboratory physical property test, hierarchical microscope identification and experimental calculation on the core sample;
immersing a core sample collected from a deep sea borehole in seawater at the same temperature and pressure as the coring, and performing continuous top-to-bottom physical property test on the core sample;
the laboratory seawater temperature is measured by a temperature probe of a downward measuring device in a drill hole, and the laboratory seawater surface pressure is calculated by a single-beam or multi-beam central beam water depth value of the bottom surface of the drill hole;
taking an induction resistivity and sound velocity measurement method as an example, when the physical properties of a core sample in a chamber are tested, the distance between a detector and the sample is consistent with the distance between equipment in a borehole and a borehole wall; the sound wave speed is the longitudinal wave speed, and the value of the sound wave speed is measured by a sound wave detector and is the sound path of the sample divided by the time of the sound wave passing through the sample; the sensing resistivity is measured by an electrical measuring instrument, and the value of the sensing resistivity is the product of the cross-sectional area of the sample and the resistance value divided by the length between the two measuring electrodes;
after the test is finished, taking out a sample, and carrying out hierarchical microscope identification and experimental calculation on the sample to obtain the relative content value of sulfide and surrounding rock of each layer section; because the core samples are endowed below the seabed surface of the hydrothermal area, the oxide content is extremely low, so that oxide components can be ignored, and only the relative content of surrounding rock and sulfide is considered;
slicing the sample according to a certain thickness, grinding into a polished section, and observing the whole polished section sample under a microscope. Since the minerals composing the rock have a remarkable difference in reflection gloss from the minerals composing the sulfide, most of the rock minerals are glass gloss or grease gloss, while the sulfide minerals have remarkable metallic gloss. Therefore, all minerals with metallic luster are circled on the light sheet, and the areas of the circled areas are added up and then divided by the area of the whole sample, so that the relative area content of sulfide can be obtained. Then, the relative area content of sulfide is multiplied by the density of sulfide at the horizon and divided by the sum of products of sulfide and surrounding rock and the respective densities to obtain the relative percentage content of sulfide and surrounding rock.
The densities of sulfide and surrounding rock in the core samples of each layer are obtained by dividing the weights of the sulfide and surrounding rock samples selected under a microscope by the volumes of the sulfide and surrounding rock samples, wherein the weights are obtained by weighing through an electronic balance, and the volumes are obtained by a drainage method.
The calculation formula of the sulfide content in the core sample: p (P) cs ＝M cs *ρ cs /(M cs *ρ cs +M cr *ρ cr )；
The calculation formula of the surrounding rock content in the core sample comprises the following steps: p (P) cr ＝M cr *ρ cr /(M cs *ρ cs +M cr *ρ cr )；
Wherein P is cs Represents the percentage of sulfide, P in the core sample cr Represents the percentage content of surrounding rock in the core sample, P cs +P cr ＝1，M cs Representing the total area of sulfides in the light sheet ρ cs Representing the density of sulfides, M cr Representing the total area of surrounding rock in the polished section, ρ cr Represents the density of the surrounding rock;
step 3, establishing a distinguishing formula of sulfide and surrounding rock in a laboratory environment;
based on a multiparameter physical property measurement method, establishing a distinguishing standard of sulfide and surrounding rock in a laboratory environment;
taking an induction resistivity and sound velocity measurement method as an example, firstly, as deep sea hydrothermal sulfide is formed by combining metal cation substances and sulfide anions, the conductivity is strong, and the induction resistivity is lower than that of surrounding rock formed by magma condensation; secondly, deep sea hydrothermal sulfide is deposited and piled up from hydrothermal fluid, and is not compacted and cross-linked, so that the porosity of the hydrothermal sulfide is higher than that of surrounding rock, and the sound wave propagation speed of the hydrothermal sulfide is lower than that of the surrounding rock;
based on the relation, a polynomial function relation between the induction resistivity, the sound wave speed and the relative content of sulfide or surrounding rock can be determined; polynomial regression analysis is performed on the induction resistivity, the sonic velocity and the relative sulfide content of each interval measured in the step 2, and the following formula can be obtained by fitting:
p s ＝a n R n +a n-1 R n-1 +···+ a 1 R+a 0 +b n S n +b n-1 S n-1 +···+b 1 S+b 0 (1)
wherein R and S respectively represent the induction resistivity value and the sonic velocity value of a certain stratum interval, a n To a 0 B n To b 0 The coefficient of the polynomial is fitted by the polynomial to obtain a constant value; p (P) s Represents the relative percentage of sulfide in a certain interval; p is p s ＝[0,1]，p s When=1, the whole layer section is sulfide, p s When=0, the whole interval is surrounding rock;
step 4, taking the average value of the drilling measurement curves of all the layers into the distinguishing formula obtained in the step 3, and calculating the relative content of sulfide and surrounding rock of all the layers of the whole section;
reading curve values corresponding to the depth values in different layers on the physical property detection curve of the drilling section, and calculating the average value of the physical property parameters of each layer;
taking the induction resistivity (R) and the sound wave speed (S) as examples, taking the calculated average value of the induction resistivity and the sound wave speed of each layer section into a fitting formula (1) obtained in the step 3, and obtaining the relative proportion of sulfide and surrounding rock of each layer section on the full-section measurement curve of the drilling hole;
the results of the drilling analysis are shown in fig. 1.
As described above, similar technical solutions can be derived from the solution content given by combining the drawings and the description, and still fall within the scope of the claims of the technical solution of the present invention.
Claims (6)
1. A drilling, measuring and analyzing method for in-situ quantification and distinguishing deep sea hydrothermal sulfide from surrounding rock is characterized by comprising the following steps of: comprises a plurality of steps of the method, including the steps of,
step 1, drilling and coring are carried out in a sulfide mining area, multi-parameter drilling measurement is carried out, and stratum interval division is carried out from top to bottom according to a measurement curve;
step 2, carrying out laboratory physical property test, hierarchical microscope identification and experimental calculation on the core sample;
step 3, establishing a distinguishing formula of sulfide and surrounding rock in a laboratory environment;
and step 4, taking the average value of the drilling measurement curves of all the layers into the distinguishing formula obtained in the step 3, and calculating the relative content of sulfide and surrounding rock of all the layers of the whole section.
2. The in-situ quantitative analysis method for distinguishing deep sea hydrothermal sulfide from surrounding rock according to claim 1, which is characterized by comprising the following steps: said step 1 comprises the following procedure,
drilling and coring are carried out on the sea bottom surface of the deep sea sulfide mining area;
after the coring is completed, vertically lowering physical property measuring equipment in the center of the drilling hole and starting to perform full-hole section measuring work;
when more measurement curves exist, selecting the most stable curve as a reference to correct the depth range of other curves;
and dividing the whole measurement section from top to bottom by taking the maximum value of the measurement curve and the middle depth value point of the adjacent minimum value of the measurement curve or the middle depth value point of the minimum value of the measurement curve and the adjacent maximum value of the measurement curve as a boundary.
3. The in-situ quantitative analysis method for distinguishing deep sea hydrothermal sulfide from surrounding rock according to claim 1, which is characterized by comprising the following steps: the step 2 includes a process of,
immersing a core sample collected from a deep sea borehole in seawater at the same temperature and pressure as the coring, and performing continuous top-to-bottom physical property test on the core sample;
and after the test is finished, taking out the sample, and carrying out hierarchical microscope identification and experimental calculation on the sample to obtain the relative content value of sulfide and surrounding rock of each layer section.
4. The in-situ quantitative analysis method for distinguishing deep sea hydrothermal sulfide from surrounding rock according to claim 3, which is characterized by comprising the following steps: in the step 2, the temperature of the laboratory seawater is measured by a temperature probe of a downward measuring device in the drill hole, and the surface pressure of the laboratory seawater is calculated by a single-beam or multi-beam central beam water depth value of the bottom surface of the drill hole.
5. The in-situ quantitative analysis method for distinguishing deep sea hydrothermal sulfide from surrounding rock according to claim 1, which is characterized by comprising the following steps: said step 3 comprises a procedure described below,
based on a multiparameter physical property measurement method, establishing a distinguishing standard of sulfide and surrounding rock in a laboratory environment;
polynomial function relation exists between the induction resistivity, the sound wave speed and the relative content of sulfide or surrounding rock, polynomial regression analysis is carried out based on the induction resistivity, the sound wave speed and the relative content of sulfide of each interval measured in the step 2, and the following fitting formula, P, is obtained s ＝a n R n +a n-1 R n-1 +···+a 1 R+a 0 +b n S n +b n-1 S n-1 +···+b 1 S+b 0 (1)
Wherein R and S respectively represent the induction resistivity value and the sonic velocity value of a certain stratum interval, a n To a 0 B n To b 0 The coefficient of the polynomial is fitted by the polynomial to obtain a constant value; p is p s Represents the relative percentage of sulfide in a certain interval; p (P) s ＝[0,1]，p s When=1, the whole layer section is sulfide, P s The whole interval is surrounding rock when=0.
6. The in-situ quantitative analysis method for distinguishing deep sea hydrothermal sulfide from surrounding rock according to claim 1, which is characterized by comprising the following steps: said step 4 comprises a procedure described below,
reading curve values corresponding to the depth values in different layers on the physical property detection curve of the drilling section, and calculating the average value of the physical property parameters of each layer;
and (3) taking the calculated average value of the induction resistivity and the sonic velocity of each layer segment into a fitting formula (1) obtained in the step (3) to obtain the relative proportion of sulfide and surrounding rock of each layer segment on the full-section measurement curve of the drilling hole.
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