CN115078691A - Geological monitoring method and system for hydrate in seabed stratum space - Google Patents
Geological monitoring method and system for hydrate in seabed stratum space Download PDFInfo
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Abstract
The invention discloses a geological monitoring method and a geological monitoring system for a hydrate in a seabed stratum space, which relate to the field of geological monitoring, and the method comprises the following steps: acquiring environmental parameters of a target drilling area; the environmental parameters include at least: seabed stratum parameters and soil layer physical parameters; the environmental parameters are acquired by a sensor array on the drilling robot; calculating the occurrence probability of the hydrate corresponding to each environmental parameter; calculating the hydrate occurrence possible value of the target drilling area according to the hydrate occurrence probabilities corresponding to all the environmental parameters; determining the hydrate occurrence condition of the target drilling area according to the hydrate occurrence possible value; the hydrate occurrence is used to determine whether the target drilling zone is a natural gas hydrate production trial zone. The method overcomes the defect of single monitoring parameter of the existing hydrate stratum, can effectively explore the distribution condition of the hydrate in the seabed stratum, and improves the geological monitoring accuracy of the hydrate in the seabed stratum space.
Description
Technical Field
The invention relates to the field of geological monitoring, in particular to a geological monitoring method and system for a hydrate in a seabed stratum space.
Background
Submarine geological exploration is mostly an investigation and research activity for exploring and detecting geology and calculating basic parameters by various means and methods, wherein the submarine geophysical exploration mainly explores petroleum and natural gas structures and some submarine sedimentary deposits. Because the deep sea human activities and engineering construction are relatively few, the conventional submarine geophysical prospecting mainly adopts various non-contact instruments or equipment for detection, and submarine geological information obtained by the method has great limitation. The deep sea seabed engineering geological monitoring method and system are relatively few, and especially aim at long-term monitoring of natural gas hydrate development environment. At present, no system is formed by an evaluation technical method aiming at a deep sea hydrate trial mining area, for example, a conventional field investigation technical method is utilized to investigate engineering geological characteristic parameters of the hydrate trial mining area, and data changes before and after trial mining are simply analyzed. The method is single, only rough direct comparative analysis is needed, advanced processing procedures such as data screening and characteristic value solving are not needed, the artificial influence is large, the scientific rationality of the evaluation result is poor, and the accuracy of geological monitoring needs to be improved.
Disclosure of Invention
Based on the above, the embodiment of the invention provides a geological monitoring method and system for the hydrate in the seabed stratum space, which overcome the defect of single monitoring parameter of the existing hydrate stratum, can effectively explore the distribution situation of the hydrate in the seabed stratum and improve the geological monitoring accuracy of the hydrate in the seabed stratum space.
In order to achieve the purpose, the invention provides the following scheme:
a method for geologically monitoring hydrate in a space of a seabed stratum, comprising:
acquiring environmental parameters of a target drilling area; the environmental parameters include at least: seabed stratum parameters and soil layer physical parameters; the environmental parameters are acquired by a sensor array on the drilling robot;
calculating the occurrence probability of the hydrate corresponding to each environmental parameter;
calculating the possible hydrate occurrence value of the target drilling area according to the hydrate occurrence probabilities corresponding to all the environmental parameters;
determining hydrate occurrence for the target drilling area based on the hydrate occurrence probability values; the hydrate occurrence is used to determine whether the target drilling area is a natural gas hydrate production trial area.
Optionally, the calculating the hydrate occurrence probability corresponding to each of the environmental parameters specifically includes:
for a corresponding environmental parameter acquired by any one sensor in a sensor array on the drilling robot, calculating a T value of the corresponding environmental parameter acquired by the sensor according to the statistical quantity of the environmental parameter acquired by the sensor for N times and the reference value of the corresponding environmental parameter acquired by the sensor investigated in the early stage; the statistics include mean and variance;
and searching the hydrate occurrence probability corresponding to the T value of the corresponding environmental parameter acquired by each sensor from a boundary value table to obtain the hydrate occurrence probability corresponding to each environmental parameter.
Optionally, the calculation formula of the T value is:
Optionally, the calculating the hydrate occurrence possible value of the target drilling area according to the hydrate occurrence probabilities corresponding to all the environmental parameters specifically includes:
calculating the correlation weight of each environmental parameter according to the hydrate occurrence probability, a preset influence weight table and a threshold value table;
calculating a hydrate occurrence probability value for the target drilling zone based on the environmental parameter and the corresponding correlation weight.
Optionally, the calculation formula of the possible occurrence value of the hydrate is:
wherein F represents the possible occurrence value of the hydrate; m represents the number of environment parameters; a. the i Representing the ith environmental parameter; b is i And representing the correlation weight corresponding to the ith environment parameter.
Optionally, the determining the hydrate occurrence condition of the target drilling area according to the hydrate occurrence possible value specifically includes:
and comparing the hydrate occurrence possible value with a preset occurrence possible range value to obtain the hydrate occurrence condition of the target drilling area.
Optionally, the acquiring environmental parameters of the target drilling area specifically includes:
controlling a methane sensor in the sensor array to be started;
if the methane concentration measured by the methane sensor reaches a first set threshold value, controlling a carbon dioxide sensor in the sensor array to be started;
if the concentration of the carbon dioxide measured by the carbon dioxide sensor reaches a second set threshold value, controlling a temperature sensor, a PH sensor and a pore water pressure sensor in a sensor array to be started to obtain the temperature, the PH value and the pore water pressure;
the subsea formation parameters include at least methane concentration, carbon dioxide concentration, temperature, and PH; the soil layer physical parameters at least comprise pore water pressure.
Optionally, before the calculating the probability of hydrate occurrence corresponding to each of the environmental parameters, the method further includes: screening the environmental parameters to obtain screened environmental parameters;
the screening of the environmental parameters to obtain the screened environmental parameters specifically includes:
judging whether the environmental parameters acquired by each sensor in a sensor array on the drilling robot are in a preset value range or not;
if so, determining the environmental parameter as a normal value;
if not, determining the environmental parameter as an abnormal value, and replacing a sensor corresponding to the abnormal value until the acquired environmental parameter is a normal value;
and normal values acquired by all the sensors form the screened environmental parameters.
The invention also provides a geological monitoring system for the hydrate in the seabed stratum space, which comprises the following components:
a data acquisition subsystem, disposed on the drilling robot, for:
collecting environmental parameters of a target drilling area; the environmental parameters include at least: seabed stratum parameters and soil layer physical parameters;
the data processing subsystem is connected with the data acquisition subsystem and is used for:
calculating the occurrence probability of the hydrate corresponding to each environmental parameter;
calculating the possible hydrate occurrence value of the target drilling area according to the hydrate occurrence probabilities corresponding to all the environmental parameters;
determining hydrate occurrence for the target drilling area based on the hydrate occurrence probability values; the hydrate occurrence is used to determine whether the target drilling area is a natural gas hydrate production trial area.
Optionally, the geological hydrate monitoring system for the seabed stratum space further comprises:
a data storage subsystem, coupled to the data processing subsystem, for:
storing at least the environmental parameter, the geographic location of the target drilling area, and the hydrate occurrence probability value.
Compared with the prior art, the invention has the beneficial effects that:
the embodiment of the invention provides a geological monitoring method and a geological monitoring system for a hydrate in a seabed stratum space, which are used for acquiring environmental parameters of a target drilling area; the environmental parameters include at least: seabed stratum parameters and soil layer physical parameters; the environmental parameters are acquired by a sensor array on the drilling robot; calculating the occurrence probability of the hydrate corresponding to each environmental parameter; calculating the hydrate occurrence possible value of the target drilling area according to the hydrate occurrence probabilities corresponding to all the environmental parameters; and determining the hydrate occurrence condition of the target drilling area according to the hydrate occurrence possible value. According to the invention, geological monitoring is realized based on the seabed stratum parameters and the soil layer physical parameters, the defect of single existing hydrate stratum monitoring parameter is overcome, the distribution condition of the seabed stratum hydrate can be effectively explored, and the geological monitoring accuracy of the hydrate in the seabed stratum space is improved; the drilling robot is used for penetrating into the stratum to obtain dynamic real-time environmental parameters, so that the working range of hydrate stratum monitoring operation is expanded, and the monitoring while drilling is really realized; the application scene of the invention is not limited to stratum hydrate occurrence area judgment before mining, and can also be applied to safety production monitoring in the mining process and provide basis for monitoring of environment recovery after mining.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a flow chart of a method for geologically monitoring a hydrate in a subsea stratigraphic space, provided in example 1 of the present invention;
fig. 2 is a schematic connection diagram of a drilling robot, a base station and a ship hull provided in embodiment 2 of the present invention;
FIG. 3 is a block diagram of a seafloor stratigraphic space hydrate geological monitoring system provided by embodiment 2 of the invention;
fig. 4 is a structural diagram of a data acquisition subsystem provided in embodiment 2 of the present invention;
fig. 5 is a schematic internal view of a sensor cabin provided in embodiment 2 of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description thereof.
Example 1
The embodiment provides a geological monitoring method for hydrate in a seabed stratum space, and referring to fig. 1, the method comprises the following steps:
step 101: acquiring environmental parameters of a target drilling area; the environmental parameters include at least: seabed stratum parameters and soil layer physical parameters; the environmental parameters are acquired using a sensor array on the drilling robot. One sensor on the sensor array collects an environmental parameter.
Step 102: and calculating the occurrence probability of the hydrate corresponding to each environmental parameter.
Step 103: and calculating the hydrate occurrence possible value of the target drilling area according to the hydrate occurrence probability corresponding to all the environmental parameters.
Step 104: determining hydrate occurrence for the target drilling area based on the hydrate occurrence probability values; the hydrate occurrence is used to determine whether the target drilling area is a natural gas hydrate production trial area.
In one example, step 101 specifically includes:
controlling a methane sensor in the sensor array to be started; if the methane concentration measured by the methane sensor reaches a first set threshold value, controlling a carbon dioxide sensor in the sensor array to be started; and if the concentration of the carbon dioxide measured by the carbon dioxide sensor reaches a second set threshold, controlling the temperature sensor, the PH sensor and the pore water pressure sensor in the sensor array to be started to obtain the temperature, the PH value and the pore water pressure.
The subsea formation parameters include at least methane concentration, carbon dioxide concentration, temperature, and PH; the soil layer physical parameters at least comprise pore water pressure.
In this example, all sensors in the sensor array are not turned on in real time, and some sensors are in a sleep state when a set threshold is not reached, so that the system power consumption and the system cost can be effectively reduced. The first set threshold and the second set threshold may be understood as specific values set by a user on the basis of previous research.
In one example, step 102 specifically includes:
1) calculating T values according to statistics of a plurality of environmental parameters collected by a sensor array on the drilling robot and statistics of a plurality of environmental parameters investigated in the previous stage; the statistics include mean and variance. The calculation formula of the T value is as follows:
when the drilling robot drills into a certain position, the sensor array carries out in-situ monitoring, wherein a certain sensor collects N times of data on the corresponding environmental parameters, and the average value is obtained
Namely, it is
The average value of the environmental parameters acquired by the sensor for N times is obtained;
the reference value of the corresponding environmental parameter collected by the sensor is investigated in the early stage; the variance of the N environmental parameters measured by the sensor array during the drilling of the drilling robot is S 1 Denotes, i.e. S 1 Variance of the environmental parameters acquired for the sensor for N times; s 0 Basic variance (S) of corresponding environmental parameters acquired for previously investigated sensors 0 0); n is a natural number greater than 0.
2) Searching the T value of the corresponding environmental parameter collected by each sensor from the boundary value table (the T value of the ith environmental parameter is T) i ) Corresponding probability of occurrence of hydrate P (T) i Corresponding to the probability of occurrence of hydrate of P i ) And obtaining the occurrence probability of the hydrate corresponding to each environmental parameter. Table 1 shows the values of the limits, and five sensors are used in this example, so i e [1, 2, 3, 4, 5 ] in Table 1]。
TABLE 1 boundary value table of corresponding relationship between T and P
| T | P | B i |
| T 1 ：0.05≥ | P 1 ：0.5≥ | B 1 ＝1 |
| T 2 ：0.05～0.06 | P 2 ：0.5～0.6 | B 2 ＝3 |
| T 3 ：0.06～0.07 | P 3 ：0.6～0.7 | B 3 ＝5 |
| T 4 ：0.07～0.08 | P 4 ：：0.7～0.8 | B 4 ＝4 |
| T 5 ：0.08≤ | P 5 ：0.8≤ | B 5 ＝2 |
In one example, step 103 specifically includes:
1) and calculating the correlation weight of each environmental parameter according to the hydrate occurrence probability, a preset influence weight table and a threshold value table. Specifically, the correlation weight B of each environmental parameter can be obtained correspondingly according to table 1 i . Correlation weight B of environmental parameter i The correlation with formation and decomposition of subsea hydrates is shown in table 2. Correlation weight B i The value range of (1) to (9), the embodiment only relates to five sensors, and only the value in table 1 is givenFive environmental parameters B are obtained i The value of (a).
TABLE 2 correlation weights B of environmental parameters i Correlation with formation and decomposition of subsea hydrates
2) Calculating a hydrate occurrence probability value for the target drilling zone based on the environmental parameter and the corresponding correlation weight. The calculation formula of the possible occurrence values of the hydrate is as follows:
wherein F represents the possible occurrence value of the hydrate; m represents the number of environmental parameters (i.e., the number of sensors monitoring hydrate formation parameters), and five sensors are used in this embodiment, so that M is 5; a. the i Representing the ith environmental parameter; b is i And representing the correlation weight corresponding to the ith environment parameter.
In one example, step 104 specifically includes:
and comparing the hydrate occurrence possible value with a preset occurrence possible range value to obtain the hydrate occurrence condition of the target drilling area. Specifically, the preset possible occurrence range values are divided into four ranges by using 6, 40, and 60 as critical points, and the occurrence of hydrates corresponding to each range is shown in table 3.
Table 3 the hydrate occurrence probability value F corresponds to the natural gas hydrate occurrence
In the embodiment, when the F is more than 40 and more than 60, the target drilling area is determined to be the natural gas hydrate trial production area.
In one example, after step 101 and before step 102, the environmental parameters are further filtered to obtain filtered environmental parameters.
The screening of the environmental parameters to obtain the screened environmental parameters specifically includes:
judging whether the environmental parameters acquired by each sensor in a sensor array on the drilling robot are in a preset value range or not; if so, determining the environmental parameter as a normal value; if not, determining the environmental parameter as an abnormal value, and replacing the sensor corresponding to the abnormal value until the acquired environmental parameter is a normal value. And normal values acquired by all the sensors form the screened environmental parameters. The filtered environmental parameters are used in the calculation process in the subsequent step 102, so that when the sensor fails, the sensor can be replaced in time, and the accuracy of the acquired environmental parameters can still be ensured.
The preset value range is determined according to normal distribution, and the preset value range is
Wherein the content of the first and second substances,
is the average value, t, of the environmental parameters collected by the sensor for N times a The coefficient values in the single-sided confidence interval of the t distribution are shown, and delta is the coefficient of variation.
The geological monitoring method for the hydrate in the seabed stratum space has the following advantages:
(1) the defect of single parameter of the existing hydrate stratum monitoring is overcome, the in-situ three-dimensional monitoring of the deep-sea hydrate stratum and the real-time display of multiple parameters of the deep-sea bottom layer are realized, the distribution condition of the hydrate of the seabed stratum can be effectively explored, and the geological monitoring accuracy of the hydrate of the seabed stratum space is improved.
(2) The robot can be used for penetrating into the stratum to obtain dynamic real-time geological characteristic data, the working range of hydrate stratum monitoring operation is expanded, and monitoring while drilling is really realized.
(3) The application scene is not limited to stratum hydrate occurrence area judgment before mining, and can also be applied to safety production monitoring in the mining process and provide basis for monitoring of environment recovery after mining.
(4) The method sets different calculation weights aiming at different geological monitoring parameters and different correlation degrees of the different geological monitoring parameters to the hydrate stratum, and maps the hydrate occurrence probability P with the hydrate occurrence possible value F.
Example 2
The embodiment provides a geological monitoring system for hydrate in a seabed stratum space, which needs to be carried on a drilling robot. As shown in fig. 2, the drilling robot is a hollow symmetrical structure, all the functional body joints are arranged in a modularized design, and the drilling robot has good universal adjustment and changeability, and is composed of a lateral mud discharging drill bit 1, a front support body joint 2, a steering body joint 3, a propelling body joint 4, a rear support body joint 5 and a rotation stopping wing plate 6.
The geological monitoring system of the embodiment realizes in-situ monitoring under the stratum, and the system is a complex multi-sensor integrated system for acquiring and processing data. Referring to fig. 3, the geological monitoring system for hydrate in the space of the seabed stratum of the embodiment includes: the system comprises a data acquisition subsystem, a data processing subsystem connected with the data acquisition subsystem and a data storage subsystem connected with the data processing subsystem.
A data acquisition subsystem, disposed on the drilling robot, for: collecting environmental parameters of a target drilling area; the environmental parameters include at least: seabed formation parameters and soil layer physics parameters.
As shown in fig. 1, the data acquisition subsystem is integrated in a sensor cabin 7 connected to the rear part of the rotation-stopping wing plate 6, and the drilling robot is connected with a base station 9 through an oil-electric sensing hybrid cable 8 and transmits data monitored by the data acquisition subsystem back to the base station. Besides providing various environmental data products based on hydrate exploration and pilot production according to requirements, the system also reserves a certain interface for possible equipment in the later period, and fully considers the development requirements in the later period. It is common for operators to concentrate on the vessel 10 above the sea surface or on the work platform for maneuvering operations. The communication function is carried out between the ship body 10 and the base station 9 through cables.
The structure of the specific data acquisition subsystem is shown in fig. 4, and the data acquisition subsystem mainly comprises a battery monitoring and management module, a sensor acquisition module, a data storage module and a data acquisition and communication module. The sensor acquisition module can be implemented by a sensor array. In order to facilitate management, unified power supply and data acquisition, each sensor in the sensor array is tested, and data interface definition, parameter configuration command, communication transmission protocol and power supply mode of each sensor are obtained, and are uniformly integrated in the central processing unit through the sensor interface and are sequentially installed in the sensor cabin 7, and the sensor cabin 7 is shown in fig. 5. The sensor array in the sensor pod 7 includes, but is not limited to, a temperature sensor 11, carbon dioxide (CO) 2 ) Sensor 12, pH sensor 13, methane (CH) 4 ) Sensor 14 and pore water pressure sensor 15, the body of the five sensors approximating a cylinder, as shown in fig. 5; five sensors are integrated in a sensor cabin 7 connected with the rear part of the rotation-stopping wing plate 6, as shown in figure 1. The data acquisition subsystem transmits the environmental parameters acquired by the sensor acquisition module to the data processing subsystem through the communication module through the RS485 bus, as shown in FIG. 3.
Methane molecules in water diffuse into the detection chamber through the diaphragm, a pressure gradient is formed between the water and the detection chamber, and according to the Law of Henry, the concentration of gas in the detection chamber is directly related to the concentration of gas in the external water environment, so that the concentration of the gas in the external water environment is calculated. The carbon dioxide sensor contains a gas permeable silica gel membrane inside, liquid and solid cannot pass through the membrane, carbon dioxide gas is sucked into a measuring chamber, and a filter lens and a detector are arranged in the measuring chamber to monitor the concentration of carbon dioxide. The pore water pressure sensor is responsible for measuring the excess pore water pressure and cone head resistance generated during drilling. The temperature sensor obtains temperature data through the temperature sensing part and the acquisition board.
As shown in fig. 4, the sensor array in the sensor acquisition module may further include two standby sensors, i.e., a standby sensor a and a standby sensor B. When the temperature sensor 11, carbon dioxide (CO) 2 ) Sensor 12, pH sensor 13, methane (CH) 4 ) When the sensor 14 and the pore water pressure sensor 15 are in failure, the standby sensor can be used as a new sensor for replacement; when other seabed stratum parameters or soil layer physical parameters need to be measured, the spare sensor can be adopted for collecting, if density needs to be collected, the spare sensor can be a density sensor so as to directly measure soil layer density geological parameters and find the geological parameter characteristics of the lower cladding and the upper cladding of the hydrate reservoir.
If the sensor array in the data acquisition module comprises a methane sensor, a carbon dioxide sensor, a temperature sensor, a PH sensor and a pore water pressure sensor, the working process is as follows: monitoring the concentration of methane in a place through a methane sensor, generating a trigger signal when the concentration of methane exceeds a first set threshold value, and sending the trigger signal to a carbon dioxide sensor; then, a carbon dioxide sensor receives a trigger signal, and the dormant state is switched to the working state to acquire the concentration of the carbon dioxide at the current position. And when the concentration of the carbon dioxide exceeds a second set threshold value, the pore water pressure sensor, the PH sensor and the temperature sensor are switched to a working state from a dormant state. The sleep state of the data acquisition module can effectively reduce the system power consumption and the system cost, the data acquisition module adopts narrow bandwidth communication to transmit information, the system power consumption can be reduced, the accuracy of system positioning can be guaranteed, and the system power consumption and the system operation and maintenance cost can be further reduced due to the reduction of the system power consumption. The threshold value can be defined as a specific numerical value set by self-definition based on previous research.
The data processing subsystem can be integrated in the base station or a PC terminal connected with the base station. The data processing subsystem mainly comprises a data receiving and processing module, the data processing subsystem calculates monitoring data according to a computer program which is stored on the data storage subsystem and can run on the data storage subsystem, judges whether the monitoring area is suitable for being used as a natural gas hydrate trial production area or not according to an execution result, and sends the execution result to the data storage subsystem. Specifically, the data processing subsystem is configured to: calculating the occurrence probability of the hydrate corresponding to each environmental parameter; calculating the possible hydrate occurrence value of the target drilling area according to the hydrate occurrence probabilities corresponding to all the environmental parameters; determining hydrate occurrence for the target drilling area based on the hydrate occurrence probability values; the hydrate occurrence is used to determine whether the target drilling area is a natural gas hydrate production trial area.
A data storage subsystem, coupled to the data processing subsystem, for: storing at least the environmental parameter, the geographic location of the target drilling area, and the hydrate occurrence probability value. Specifically, the data storage subsystem stores the geographic position of an explorable submarine natural gas hydrate stratum distribution area, the possible hydrate occurrence value of the area and the environmental parameter data monitored by the sensor array. And storing data obtained by the previous investigation as a reference value into an initial data database, storing monitoring data related to submarine topography into a topography database, storing monitoring data related to physical and mechanical parameters of a soil layer under the sea into a soil layer parameter database, and storing investigation ranges of various environmental parameters, spatial positions of investigation stations and the like into the database.
The specific implementation process of the seabed stratum space hydrate geological monitoring system is as follows:
1. the sensor array acquires environmental parameters which can be monitored in a drilling area of the current drilling robot, wherein the environmental parameters comprise seabed stratum parameters and soil layer physical and mechanical parameters. The subsea formation parameters include: methane concentration, carbon dioxide concentration, temperature and PH value, and the soil layer physical mechanical parameters mainly refer to pore water pressure and density. And if the environmental parameter value monitored by the sensor falls in a preset value range determined by normal distribution, determining that the sensor is abnormal.
The specific process of data acquisition in this step is as follows:
(1) and preliminarily determining a target area according to the trial exploitation project of the hydrate in the sea area. The method is characterized by comprehensively collecting and analyzing the existing survey data information related to the natural gas hydrate in the area and related historical research results, such as regional structure, geological disaster, hydrological environment, hydrate occurrence form, geological related data information and the like. The preliminary investigation is carried out to provide reference basis for the sensor array carried by the drilling robot to examine the hydrate stratum in detail.
(2) According to rough geological information, water depth topography and other related reference data of a target area, seabed topography change, structural structure, seabed stratum influence and the like of a hydrate trial mining area are found out, geological units related to stable storage of natural gas hydrate are focused on, in-situ environmental parameters of a drilling area such as flow velocity, waves, temperature, salinity, methane concentration, carbon dioxide concentration, hydrogen sulfide concentration, polycyclic aromatic hydrocarbon, PH value, dissolved oxygen and other sensitive parameters of natural gas hydrate occurrence and environmental effect research are preliminarily found out by means of a drilling robot, and physical and mechanical characteristics of a shallow surface soil body of the trial mining area are preliminarily found out.
(3) And (3) establishing a submarine geological environment monitoring base line in the target area by combining preliminarily found stratum mechanical characteristics of the trial mining area, surveying from inside to outside, enlarging the radius in proportion, and distributing the next survey station in a shape of Chinese character 'mi' in eight directions around a survey central point. The drilling robot drills vertically and horizontally in the subsea formation and detailed monitoring is deployed for these eight key survey stations.
2. And comprehensively comparing and analyzing a large amount of data acquired by investigation and monitoring on the geological environment base line of the target area trial mining area by using data management statistical software. And respectively establishing evaluation layers with different parameters in data management statistical software aiming at the environmental parameters monitored by different sensors. The system evaluates the distribution condition of the sea area hydrates and the influence of sea area hydrate exploitation on the geological environment of the seabed engineering. And calculating the value T according to the formula value T. And defining a corresponding relation boundary value table (table 1) of T and P according to the actual investigation range and the seabed area range which is possible to be reached finally according to the actual hydrate trial production amount. According to the correlation between each environmental parameter and the formation and decomposition of the sea-bottom hydrate, the correlation weight B is compared with a preset correlation weight table (table 2) to obtain M correlation weights B. And obtaining the F value according to a calculation formula of the hydrate occurrence possible value F, thereby judging the occurrence condition of the hydrate in the monitoring area.
3. And comparing the hydrate occurrence possible value F with a preset hydrate occurrence range value (table 3), judging the hydrate occurrence condition of the monitoring area of the drilling robot, and providing scientific basis for reasonably selecting an exploitation area in the trial exploitation process.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the system disclosed by the embodiment, the description is relatively simple because the system corresponds to the method disclosed by the embodiment, and the relevant points can be referred to the method part for description.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (10)
1. A geological monitoring method for hydrate in a seabed stratum space is characterized by comprising the following steps:
acquiring environmental parameters of a target drilling area; the environmental parameters include at least: seabed stratum parameters and soil layer physical parameters; the environmental parameters are acquired by a sensor array on the drilling robot;
calculating the occurrence probability of the hydrate corresponding to each environmental parameter;
calculating the possible hydrate occurrence value of the target drilling area according to the hydrate occurrence probabilities corresponding to all the environmental parameters;
determining hydrate occurrence for the target drilling area based on the hydrate occurrence probability values; the hydrate occurrence is used to determine whether the target drilling area is a natural gas hydrate production trial area.
2. The method for geology monitoring a hydrate in a submarine stratum space according to claim 1, wherein the calculating the probability of occurrence of a hydrate corresponding to each of the environmental parameters specifically includes:
for a corresponding environmental parameter acquired by any one sensor in a sensor array on the drilling robot, calculating a T value of the corresponding environmental parameter acquired by the sensor according to the statistical quantity of the environmental parameter acquired by the sensor for N times and the reference value of the corresponding environmental parameter acquired by the sensor investigated in the early stage; the statistics include mean and variance;
and searching the hydrate occurrence probability corresponding to the T value of the corresponding environmental parameter acquired by each sensor from a boundary value table to obtain the hydrate occurrence probability corresponding to each environmental parameter.
3. The method for geologic monitoring of hydrates in a geospatial seafloor stratigraphic space of claim 2, wherein the formula for the calculation of the value of T is:
4. The method for geology monitoring hydrates in a space of a submarine formation according to claim 1, wherein the calculating of the possible hydrate occurrence values in the target drilling area according to the hydrate occurrence probabilities corresponding to all environmental parameters specifically comprises:
calculating the correlation weight of each environmental parameter according to the hydrate occurrence probability, a preset influence weight table and a threshold value table;
calculating a hydrate occurrence probability value for the target drilling zone based on the environmental parameter and the corresponding correlation weight.
5. The method for geologically monitoring hydrate in a submarine stratum space according to claim 4, wherein the calculation formula of the possible hydrate occurrence value is as follows:
wherein F represents the possible occurrence value of the hydrate; m represents the number of environmental parameters; a. the i Representing the ith environmental parameter; b is i And representing the correlation weight corresponding to the ith environment parameter.
6. The method for geologically monitoring hydrate in a subsea stratigraphic space according to claim 1, wherein said determining the hydrate occurrence in the target drilling area according to the hydrate occurrence probability value comprises:
and comparing the hydrate occurrence possible value with a preset occurrence possible range value to obtain the hydrate occurrence condition of the target drilling area.
7. The method for geologically monitoring a hydrate in a formation space of a sea floor according to claim 1, wherein the obtaining of the environmental parameters of the target drilling area specifically comprises:
controlling a methane sensor in the sensor array to be started;
if the methane concentration measured by the methane sensor reaches a first set threshold value, controlling a carbon dioxide sensor in the sensor array to be started;
if the concentration of the carbon dioxide measured by the carbon dioxide sensor reaches a second set threshold value, controlling a temperature sensor, a PH sensor and a pore water pressure sensor in a sensor array to be started to obtain the temperature, the PH value and the pore water pressure;
the subsea formation parameters include at least methane concentration, carbon dioxide concentration, temperature, and PH; the soil layer physical parameters at least comprise pore water pressure.
8. The method for geologically monitoring hydrate in a submarine stratum space according to claim 7, wherein before the calculating the probability of hydrate occurrence for each of the environmental parameters, the method further comprises: screening the environmental parameters to obtain screened environmental parameters;
the screening of the environmental parameters to obtain the screened environmental parameters specifically includes:
judging whether the environmental parameters acquired by each sensor in a sensor array on the drilling robot are in a preset value range or not;
if so, determining the environmental parameter as a normal value;
if not, determining the environmental parameter as an abnormal value, and replacing a sensor corresponding to the abnormal value until the acquired environmental parameter is a normal value;
and normal values acquired by all the sensors form the screened environmental parameters.
9. A seafloor formation space hydrate geological monitoring system, comprising:
a data acquisition subsystem disposed on the drilling robot for:
collecting environmental parameters of a target drilling area; the environmental parameters include at least: seabed stratum parameters and soil layer physical parameters;
the data processing subsystem is connected with the data acquisition subsystem and is used for:
calculating the occurrence probability of the hydrate corresponding to each environmental parameter;
calculating the possible hydrate occurrence value of the target drilling area according to the hydrate occurrence probabilities corresponding to all the environmental parameters;
determining hydrate occurrence for the target drilling area based on the hydrate occurrence probability values; the hydrate occurrence is used to determine whether the target drilling area is a natural gas hydrate production trial area.
10. The seafloor stratigraphic space hydrate geological monitoring system of claim 8, further comprising:
a data storage subsystem, coupled to the data processing subsystem, for:
storing at least the environmental parameter, the geographic location of the target drilling area, and the hydrate occurrence probability value.
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