CN111624675A - Exploration method and system of land natural gas hydrate - Google Patents
Exploration method and system of land natural gas hydrate Download PDFInfo
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- CN111624675A CN111624675A CN201910144549.0A CN201910144549A CN111624675A CN 111624675 A CN111624675 A CN 111624675A CN 201910144549 A CN201910144549 A CN 201910144549A CN 111624675 A CN111624675 A CN 111624675A
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Abstract
The invention provides a method and a system for exploring a land natural gas hydrate. The exploration method of the land natural gas hydrate comprises the following steps: exciting a controllable seismic source at a preset electromagnetic sounding point position to obtain first seismic data; increasing the coverage times of the first seismic data to obtain second seismic data; obtaining a chromatographic velocity according to the second seismic data; performing magnetotelluric sounding at the electromagnetic sounding point to obtain a resistivity profile; obtaining a distribution area of frozen soil according to the resistivity profile and the chromatographic speed; and obtaining the distribution area of the natural gas hydrate according to the second seismic data, the resistivity profile and the distribution area of the frozen soil so as to effectively explore the distribution area of the terrestrial natural gas hydrate.
Description
Technical Field
The invention relates to the field of exploration of terrestrial natural gas hydrates, in particular to a method and a system for exploring terrestrial natural gas hydrates.
Background
The natural gas hydrate has the resource advantages of small pollution, large reserve, wide distribution, high energy density and the like, is praised as strategic and alternative energy in the future, and draws high attention of all countries in the world. Compared with the marine natural gas hydrate, the exploration and exploitation of the land natural gas hydrate are safer and more convenient. The sea area natural gas hydrate seismic reflection characteristics are mainly as follows: the BSR phenomenon and the abnormal amplitude 'blank reflection band' are abnormal in speed and abnormal in AVO, but compared with the stable pressure condition of the seabed, the stable distribution area of the natural gas hydrate in the frozen soil band of the land area is influenced by various aspects such as ground temperature gradient, formation pressure and geological structure, and the geological and geophysical conditions are more complicated. At present, exploration of terrestrial natural gas hydrates has certain difficulty.
Disclosure of Invention
The embodiment of the invention mainly aims to provide a method and a system for exploring a land natural gas hydrate so as to effectively explore a distribution area of the land natural gas hydrate.
In order to achieve the above object, an embodiment of the present invention provides a method for exploring a terrestrial natural gas hydrate, including:
exciting a controllable seismic source at a preset electromagnetic sounding point position to obtain first seismic data;
increasing the coverage times of the first seismic data to obtain second seismic data;
obtaining a chromatographic velocity according to the second seismic data;
performing magnetotelluric sounding at the electromagnetic sounding point to obtain a resistivity profile;
obtaining a distribution area of frozen soil according to the resistivity profile and the chromatographic speed;
and obtaining the distribution area of the natural gas hydrate according to the second seismic data, the resistivity profile and the distribution area of the frozen soil.
In one embodiment, obtaining the tomographic velocity from the second seismic data comprises:
establishing a chromatography speed model;
and inputting second seismic data into the chromatographic velocity model to obtain the chromatographic velocity.
In one embodiment, obtaining the distribution region of the gas hydrate according to the second seismic data, the resistivity profile and the distribution region of the frozen earth includes:
obtaining characteristic data of the natural gas hydrate according to the second seismic data, the resistivity profile and the distribution area of the frozen soil;
and obtaining the distribution area of the natural gas hydrate according to the characteristic data of the natural gas hydrate.
In one embodiment, the feature data includes: frequency, phase, amplitude, velocity, and electrical characteristics.
The embodiment of the invention also provides a system for exploring the land natural gas hydrate, which comprises the following steps:
the first seismic data unit is used for exciting a controllable seismic source at a preset electromagnetic sounding point to obtain first seismic data;
the second seismic data unit is used for increasing the covering times of the first seismic data to obtain second seismic data;
the chromatography speed unit is used for obtaining the chromatography speed according to the second seismic data;
the resistivity profile unit is used for performing magnetotelluric sounding at the electromagnetic sounding point to obtain a resistivity profile;
the frozen soil distribution area unit is used for obtaining a frozen soil distribution area according to the resistivity profile and the chromatographic speed;
and the natural gas hydrate distribution area unit is used for obtaining the natural gas hydrate distribution area according to the second seismic data, the resistivity profile and the distribution area of the frozen soil.
In one embodiment, the chromatography speed unit is specifically configured to:
establishing a chromatography speed model;
and inputting second seismic data into the chromatographic velocity model to obtain the chromatographic velocity.
In one embodiment, the gas hydrate distribution area unit is specifically configured to:
obtaining characteristic data of the natural gas hydrate according to the second seismic data, the resistivity profile and the distribution area of the frozen soil;
and obtaining the distribution area of the natural gas hydrate according to the characteristic data of the natural gas hydrate.
In one embodiment, the feature data includes: frequency, phase, amplitude, velocity, and electrical characteristics.
The embodiment of the present invention further provides a computer device, which includes a memory, a processor, and a computer program stored in the memory and capable of running on the processor, and when the processor executes the computer program, the following steps are implemented:
exciting a controllable seismic source at a preset electromagnetic sounding point position to obtain first seismic data;
increasing the coverage times of the first seismic data to obtain second seismic data;
obtaining a chromatographic velocity according to the second seismic data;
performing magnetotelluric sounding at the electromagnetic sounding point to obtain a resistivity profile;
obtaining a distribution area of frozen soil according to the resistivity profile and the chromatographic speed;
and obtaining the distribution area of the natural gas hydrate according to the second seismic data, the resistivity profile and the distribution area of the frozen soil.
An embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the following steps:
exciting a controllable seismic source at a preset electromagnetic sounding point position to obtain first seismic data;
increasing the coverage times of the first seismic data to obtain second seismic data;
obtaining a chromatographic velocity according to the second seismic data;
performing magnetotelluric sounding at the electromagnetic sounding point to obtain a resistivity profile;
obtaining a distribution area of frozen soil according to the resistivity profile and the chromatographic speed;
and obtaining the distribution area of the natural gas hydrate according to the second seismic data, the resistivity profile and the distribution area of the frozen soil.
According to the exploration method and system of the land natural gas hydrate, the vibroseis is excited at the preset electromagnetic sounding point to obtain first seismic data, the covering times of the first seismic data are increased to obtain second seismic data, and the chromatographic velocity is obtained according to the second seismic data; then magnetotelluric sounding is carried out at the electromagnetic sounding point position to obtain a resistivity profile; and finally, obtaining the distribution area of the natural gas hydrate according to the second seismic data, the resistivity profile and the distribution area of the frozen soil so as to effectively explore the distribution area of the terrestrial natural gas hydrate.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments will be briefly introduced 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 that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a flow chart of a method of land based natural gas hydrate exploration in an embodiment of the invention;
FIG. 2 is a block diagram of a land-based natural gas hydrate exploration system according to an embodiment 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.
As will be appreciated by one skilled in the art, embodiments of the present invention may be embodied as a system, apparatus, device, method, or computer program product. Accordingly, the present disclosure may be embodied in the form of: entirely hardware, entirely software (including firmware, resident software, micro-code, etc.), or a combination of hardware and software.
In view of the difficulty in exploring the land natural gas hydrate in the prior art, the embodiment of the invention provides an exploration method of the land natural gas hydrate, so as to effectively explore the distribution area of the land natural gas hydrate. The present invention will be described in detail below with reference to the accompanying drawings.
FIG. 1 is a flow chart of a method for land based gas hydrate exploration in an embodiment of the invention. As shown in fig. 1, the method for exploring the terrestrial natural gas hydrate includes:
s101: and exciting a controllable seismic source at a preset electromagnetic sounding point to obtain first seismic data.
The controllable seismic source can be a low-frequency controllable seismic source, the frequency band range of seismic data obtained by the excitation of the low-frequency controllable seismic source is wider, and the analysis of the frequency characteristics of the natural gas hydrate is facilitated.
S102: and increasing the covering times of the first seismic data to obtain second seismic data.
The coverage times of the seismic data can be increased by using a wide-line high-density observation system so as to improve the signal-to-noise ratio of the seismic data, obtain the two-dimensional seismic data with high density and small track pitch, and be beneficial to analyzing the amplitude characteristics of the natural gas hydrate.
S103: and obtaining the chromatographic velocity according to the second seismic data.
S104: and performing magnetotelluric sounding at the electromagnetic sounding point to obtain a resistivity profile.
The same electromagnetic sounding point position of the controllable seismic source is excited to carry out the magnetotelluric sounding, so that the time consistency and the position consistency of seismic data and a resistivity profile can be ensured, the data difference caused by different construction time and measurement errors is avoided, and meanwhile, the exploration cost is effectively saved.
S105: and obtaining the distribution area of the frozen soil according to the resistivity profile and the chromatographic speed.
Specifically, the chromatographic speed and the resistivity profile are compared and analyzed, so that the speed difference and the macroscopic electrical property difference between the permafrost layer and the natural gas hydrate and the underlying stratum can be obtained through analysis, and the distribution area of the permafrost can be further identified and obtained through the difference.
S106: and obtaining the distribution area of the natural gas hydrate according to the second seismic data, the resistivity profile and the distribution area of the frozen soil.
The execution subject of the method for exploring for terrestrial natural gas hydrates shown in fig. 1 may be a computer. As can be seen from the flow shown in fig. 1, in the exploration method of the land natural gas hydrate according to the embodiment of the present invention, the vibroseis is excited at the preset electromagnetic sounding point to obtain the first seismic data, the coverage times of the first seismic data are increased to obtain the second seismic data, and the chromatographic velocity is obtained according to the second seismic data; then magnetotelluric sounding is carried out at the electromagnetic sounding point position to obtain a resistivity profile; and finally, obtaining the distribution area of the natural gas hydrate according to the second seismic data, the resistivity profile and the distribution area of the frozen soil so as to effectively explore the distribution area of the terrestrial natural gas hydrate.
In one embodiment, S103 includes: establishing a chromatography speed model; and inputting second seismic data into the chromatographic velocity model to obtain the chromatographic velocity.
In one embodiment, S106 includes: obtaining characteristic data of the natural gas hydrate according to the second seismic data, the resistivity profile and the distribution area of the frozen soil; and obtaining the distribution area of the natural gas hydrate according to the characteristic data of the natural gas hydrate. Wherein the characteristic data includes: frequency, phase, amplitude, velocity, and electrical characteristics.
One of the specific embodiments of the present invention is as follows:
1. and exciting a low-frequency controllable seismic source at a preset electromagnetic sounding point to obtain first seismic data with a wider frequency band range, so that the frequency characteristics of the natural gas hydrate can be analyzed.
2. The coverage times of the seismic data are increased by utilizing a wide-line high-density observation system so as to improve the signal-to-noise ratio of the seismic data, and the two-dimensional second seismic data with high density and small track pitch are obtained, thereby being beneficial to analyzing the amplitude characteristic of the natural gas hydrate.
3. And establishing a chromatography speed model.
4. And inputting second seismic data into the chromatographic velocity model to obtain the chromatographic velocity.
5. And performing magnetotelluric sounding at the same electromagnetic sounding point for exciting the controllable seismic source to obtain a resistivity profile, and ensuring the time consistency and the position consistency of the seismic data and the resistivity profile.
6. The chromatographic speed and the resistivity profile are compared and analyzed, so that the speed difference and the macroscopic electrical property difference between the permafrost layer and the natural gas hydrate and the underlying stratum can be obtained through analysis, and the distribution area of the permafrost can be further identified and obtained through the difference.
7. And obtaining the frequency, phase, amplitude, speed and electrical characteristics of the natural gas hydrate according to the second seismic data, the resistivity profile and the distribution area of the frozen soil.
8. And obtaining the distribution area of the natural gas hydrate according to the frequency, phase, amplitude, speed and electrical characteristics of the natural gas hydrate.
In summary, in the exploration method of the land natural gas hydrate, the vibroseis is excited at the preset electromagnetic sounding point to obtain the first seismic data, the covering times of the first seismic data are increased to obtain the second seismic data, and the chromatographic velocity is obtained according to the second seismic data; then magnetotelluric sounding is carried out at the electromagnetic sounding point position to obtain a resistivity profile; and finally, obtaining the distribution area of the natural gas hydrate according to the second seismic data, the resistivity profile and the distribution area of the frozen soil so as to effectively explore the distribution area of the terrestrial natural gas hydrate.
Based on the same inventive concept, the embodiment of the invention also provides a system for exploring the terrestrial natural gas hydrate, and as the problem solving principle of the system is similar to the method for exploring the terrestrial natural gas hydrate, the implementation of the system can be referred to the implementation of the method, and repeated parts are not described again.
FIG. 2 is a block diagram of a land-based natural gas hydrate exploration system according to an embodiment of the present invention. As shown in fig. 2, the land-based natural gas hydrate exploration system includes:
the first seismic data unit is used for exciting a controllable seismic source at a preset electromagnetic sounding point to obtain first seismic data;
the second seismic data unit is used for increasing the covering times of the first seismic data to obtain second seismic data;
the chromatography speed unit is used for obtaining the chromatography speed according to the second seismic data;
the resistivity profile unit is used for performing magnetotelluric sounding at the electromagnetic sounding point to obtain a resistivity profile;
the frozen soil distribution area unit is used for obtaining a frozen soil distribution area according to the resistivity profile and the chromatographic speed;
and the natural gas hydrate distribution area unit is used for obtaining the natural gas hydrate distribution area according to the second seismic data, the resistivity profile and the distribution area of the frozen soil.
In one embodiment, the chromatography speed unit is specifically configured to:
establishing a chromatography speed model;
and inputting second seismic data into the chromatographic velocity model to obtain the chromatographic velocity.
In one embodiment, the gas hydrate distribution area unit is specifically configured to:
obtaining characteristic data of the natural gas hydrate according to the second seismic data, the resistivity profile and the distribution area of the frozen soil;
and obtaining the distribution area of the natural gas hydrate according to the characteristic data of the natural gas hydrate.
In one embodiment, the feature data includes: frequency, phase, amplitude, velocity, and electrical characteristics.
In summary, the exploration system of the land natural gas hydrate in the embodiment of the invention firstly excites the controllable seismic source at the preset electromagnetic sounding point to obtain the first seismic data, then increases the covering times of the first seismic data to obtain the second seismic data, and obtains the chromatographic velocity according to the second seismic data; then magnetotelluric sounding is carried out at the electromagnetic sounding point position to obtain a resistivity profile; and finally, obtaining the distribution area of the natural gas hydrate according to the second seismic data, the resistivity profile and the distribution area of the frozen soil so as to effectively explore the distribution area of the terrestrial natural gas hydrate.
The embodiment of the present invention further provides a computer device, which includes a memory, a processor, and a computer program stored in the memory and capable of running on the processor, and when the processor executes the computer program, the following steps are implemented:
exciting a controllable seismic source at a preset electromagnetic sounding point position to obtain first seismic data;
increasing the coverage times of the first seismic data to obtain second seismic data;
obtaining a chromatographic velocity according to the second seismic data;
performing magnetotelluric sounding at the electromagnetic sounding point to obtain a resistivity profile;
obtaining a distribution area of frozen soil according to the resistivity profile and the chromatographic speed;
and obtaining the distribution area of the natural gas hydrate according to the second seismic data, the resistivity profile and the distribution area of the frozen soil.
To sum up, the computer device of the embodiment of the invention firstly excites the controllable seismic source at the preset electromagnetic sounding point to obtain the first seismic data, then increases the covering times of the first seismic data to obtain the second seismic data, and obtains the chromatographic velocity according to the second seismic data; then magnetotelluric sounding is carried out at the electromagnetic sounding point position to obtain a resistivity profile; and finally, obtaining the distribution area of the natural gas hydrate according to the second seismic data, the resistivity profile and the distribution area of the frozen soil so as to effectively explore the distribution area of the terrestrial natural gas hydrate.
An embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the following steps:
exciting a controllable seismic source at a preset electromagnetic sounding point position to obtain first seismic data;
increasing the coverage times of the first seismic data to obtain second seismic data;
obtaining a chromatographic velocity according to the second seismic data;
performing magnetotelluric sounding at the electromagnetic sounding point to obtain a resistivity profile;
obtaining a distribution area of frozen soil according to the resistivity profile and the chromatographic speed;
and obtaining the distribution area of the natural gas hydrate according to the second seismic data, the resistivity profile and the distribution area of the frozen soil.
To sum up, the computer-readable storage medium according to the embodiment of the present invention first excites a vibroseis at a preset electromagnetic sounding point to obtain first seismic data, then increases the number of times of coverage of the first seismic data to obtain second seismic data, and obtains a chromatography velocity according to the second seismic data; then magnetotelluric sounding is carried out at the electromagnetic sounding point position to obtain a resistivity profile; and finally, obtaining the distribution area of the natural gas hydrate according to the second seismic data, the resistivity profile and the distribution area of the frozen soil so as to effectively explore the distribution area of the terrestrial natural gas hydrate.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A method for exploration of land based natural gas hydrates, comprising:
exciting a controllable seismic source at a preset electromagnetic sounding point position to obtain first seismic data;
increasing the coverage times of the first seismic data to obtain second seismic data;
obtaining a chromatographic velocity according to the second seismic data;
performing magnetotelluric sounding at the electromagnetic sounding point to obtain a resistivity profile;
obtaining a distribution area of the frozen soil according to the resistivity profile and the chromatography speed;
and obtaining a distribution area of the natural gas hydrate according to the second seismic data, the resistivity profile and the distribution area of the frozen soil.
2. The method of land based natural gas hydrate exploration according to claim 1, wherein obtaining a chromatographic velocity from said second seismic data comprises:
establishing a chromatography speed model;
and inputting the second seismic data into the chromatographic velocity model to obtain the chromatographic velocity.
3. The method for exploring natural gas hydrates in land areas according to claim 1, wherein obtaining a distribution area of natural gas hydrates from the second seismic data, the resistivity profile and the distribution area of frozen earth comprises:
obtaining characteristic data of the natural gas hydrate according to the second seismic data, the resistivity profile and the distribution area of the frozen soil;
and obtaining the distribution area of the natural gas hydrate according to the characteristic data of the natural gas hydrate.
4. A method of land based natural gas hydrate exploration according to claim 3, wherein said characteristic data comprises: frequency, phase, amplitude, velocity, and electrical characteristics.
5. A land based gas hydrate exploration system, comprising:
the first seismic data unit is used for exciting a controllable seismic source at a preset electromagnetic sounding point to obtain first seismic data;
the second seismic data unit is used for increasing the covering times of the first seismic data to obtain second seismic data;
the chromatography speed unit is used for obtaining the chromatography speed according to the second seismic data;
the resistivity profile unit is used for performing magnetotelluric sounding at the electromagnetic sounding point to obtain a resistivity profile;
the frozen soil distribution area unit is used for obtaining a frozen soil distribution area according to the resistivity profile and the chromatographic speed;
and the natural gas hydrate distribution area unit is used for obtaining a natural gas hydrate distribution area according to the second seismic data, the resistivity profile and the distribution area of the frozen soil.
6. The land based natural gas hydrate exploration system of claim 5, wherein said chromatography rate unit is specifically configured to:
establishing a chromatography speed model;
and inputting the second seismic data into the chromatographic velocity model to obtain the chromatographic velocity.
7. The land area gas hydrate exploration system of claim 5, wherein said gas hydrate distribution area unit is specifically configured to:
obtaining characteristic data of the natural gas hydrate according to the second seismic data, the resistivity profile and the distribution area of the frozen soil;
and obtaining the distribution area of the natural gas hydrate according to the characteristic data of the natural gas hydrate.
8. The land based natural gas hydrate exploration system of claim 7, wherein said characteristic data comprises: frequency, phase, amplitude, velocity, and electrical characteristics.
9. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor when executing the computer program implements the steps of:
exciting a controllable seismic source at a preset electromagnetic sounding point position to obtain first seismic data;
increasing the coverage times of the first seismic data to obtain second seismic data;
obtaining a chromatographic velocity according to the second seismic data;
performing magnetotelluric sounding at the electromagnetic sounding point to obtain a resistivity profile;
obtaining a distribution area of the frozen soil according to the resistivity profile and the chromatography speed;
and obtaining a distribution area of the natural gas hydrate according to the second seismic data, the resistivity profile and the distribution area of the frozen soil.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of:
exciting a controllable seismic source at a preset electromagnetic sounding point position to obtain first seismic data;
increasing the coverage times of the first seismic data to obtain second seismic data;
obtaining a chromatographic velocity according to the second seismic data;
performing magnetotelluric sounding at the electromagnetic sounding point to obtain a resistivity profile;
obtaining a distribution area of the frozen soil according to the resistivity profile and the chromatography speed;
and obtaining a distribution area of the natural gas hydrate according to the second seismic data, the resistivity profile and the distribution area of the frozen soil.
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