CN112987102A - In-situ monitoring system for geological conditions of natural gas hydrate storage layer - Google Patents
In-situ monitoring system for geological conditions of natural gas hydrate storage layer Download PDFInfo
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- CN112987102A CN112987102A CN201911283308.0A CN201911283308A CN112987102A CN 112987102 A CN112987102 A CN 112987102A CN 201911283308 A CN201911283308 A CN 201911283308A CN 112987102 A CN112987102 A CN 112987102A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/38—Seismology; Seismic or acoustic prospecting or detecting specially adapted for water-covered areas
- G01V1/3843—Deployment of seismic devices, e.g. of streamers
- G01V1/3852—Deployment of seismic devices, e.g. of streamers to the seabed
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/02—Generating seismic energy
- G01V1/157—Generating seismic energy using spark discharges; using exploding wires
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/38—Seismology; Seismic or acoustic prospecting or detecting specially adapted for water-covered areas
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- General Life Sciences & Earth Sciences (AREA)
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Abstract
The invention provides an in-situ monitoring system for geological conditions of a natural gas hydrate reservoir. The system consists of a high-resolution multi-channel seismic detection system, a battery cabin, an automatic cable arrangement and retraction system, an electric slip ring, an acoustic communication system and a main body frame. The system provided by the invention has high integration degree, can carry out seabed in-situ high-resolution seismic exploration, and meets the requirement of in-situ monitoring on reservoir geological conditions in the natural gas hydrate exploitation process.
Description
Technical Field
The invention relates to the technical field of marine resource exploration, in particular to a natural gas hydrate reservoir geological condition in-situ monitoring system.
Background
Natural gas hydrates, also called "combustible ice", are ice-like crystalline substances formed by water and natural gas in high-pressure low-temperature environments, and are widely distributed in nature in the deep-water environments of continental permafrost, slope zones of islands, elevations at the edges of active and passive continents, polar continental shelves, and oceans and some inland lakes. Because the fuel hardly generates any residue after combustion, the pollution is lower than that of coal, petroleum and natural gas, and the resource density is high, the fuel is expected to become an ideal energy source of a new generation. However, the natural gas hydrate has a special environment, which severely limits the development of resources, including exploration.
In the development process of the natural gas hydrate, secondary disasters such as landslide, ground settlement, methane leakage and the like are easily induced to influence the drilling safety, wherein the change of the geological conditions of the storage layer is a main factor for inducing the geological disasters, so the in-situ monitoring work of the natural gas hydrate needs to be enhanced in the development process. Geophysical exploration is an important technical means for detecting natural gas hydrate reservoirs, and the positions of the natural gas hydrate reservoirs can be inferred by utilizing seabed simulation reflection signal features (BSR) in reflection seismic wavelet signals. The principle is that the reservoir position of the natural gas hydrate is identified by the large difference of acoustic impedance between a low-permeability hydrate layer and a large amount of free natural gas and saturated water sediments thereunder, the top and bottom boundaries and the occurrence of the natural gas hydrate layer can be inferred, and the depth, the thickness and the volume of the hydrate layer are calculated. However, conventional geophysical exploration uses air gun sources and large-track-length multi-channel reception (such as 6.25 meters or more), has low resolution, and adopts a two-dimensional or three-dimensional operation mode of sea surface towing, which cannot meet the resolution requirement and the requirement of in-situ monitoring. A system and a method for fine seismic exploration of natural gas hydrates are disclosed in chinese patent document CN109239782A published as 8-month and 30-month in 2018, and an air gun seismic source with a capacity of 240cu.in or 560cu.in is adopted, so that the resolution ratio is relatively low.
At present, aiming at submarine resource exploration, a used seismic source mainly comprises an air gun, the resolution and the penetration depth are low, and the storage layer geological environment is difficult to accurately determine.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a natural gas hydrate reservoir geological condition monitoring system which can realize higher resolution and penetration depth.
The embodiment of the invention provides an in-situ monitoring system for geological conditions of a natural gas hydrate storage layer. The system comprises a high-resolution multichannel seismic detection system, a battery cabin, an automatic cable arrangement and retraction system, an electric slip ring, an acoustic communication system and a main body frame, wherein the main body frame is used for bearing the high-resolution multichannel seismic detection system, the battery cabin, the automatic cable arrangement and retraction system, the electric slip ring and the acoustic communication system; the battery cabin is used for supplying power to the high-resolution multichannel seismic detection system, the automatic cable arrangement and retraction system is used for arranging a receiving cable in an area to be surveyed, and the acoustic communication system is used for collecting generated seismic waves and further deducing related information of the natural gas hydrate reservoir condition.
In one embodiment, the high-resolution multichannel seismic detection system comprises an electric spark seismic source electronic cabin, a seismic source emission head, a small-track-pitch multichannel receiving cable and a data acquisition electronic cabin, wherein the electric spark seismic source electronic cabin is connected with the data acquisition electronic cabin through a watertight cable and an electric slip ring to realize communication between an electric spark seismic source and data acquisition. The resolution of the high resolution multi-channel seismic detection system does not exceed 0.5 meters, for example.
In one embodiment, the source emission head employs low frequency bipolar emitter electrodes and an array technique.
In one embodiment, the battery compartment comprises a battery pack and a battery management system, wherein the battery compartment is connected with the electric spark source electronic compartment and the acoustic communication system through watertight cables, so that the electric spark source electronic compartment, the acoustic communication system and the data acquisition electronic compartment are powered.
In one embodiment, the automatic cable arrangement and retraction system comprises a winch, a motor and an automatic cable arrangement device, wherein the motor is connected with the battery compartment through a watertight cable to realize the starting and stopping of the motor.
In one embodiment, the acoustic communication system is connected with the data acquisition electronic cabin through a watertight cable and the electric slip ring to receive control commands and transmit and receive data.
Compared with the prior art, the invention has the advantages that: the whole system is high in integration degree, organically combines an electric spark source, a battery in-situ power supply system, an automatic cable arrangement and retraction system, a deep sea acoustic communication system and the like, and can realize in-situ exploration of geological conditions of a natural gas hydrate storage layer. The whole device has high exploration accuracy, the resolution ratio is not more than 0.5 m, and the penetration depth of the seabed stratum is not less than 200 m.
Drawings
The invention is illustrated and described only by way of example and not by way of limitation in the scope of the invention as set forth in the following drawings, in which:
FIG. 1 is a schematic illustration of a natural gas hydrate reservoir geological condition in situ monitoring system according to one embodiment of the present invention;
FIG. 2 is a schematic view from another perspective of the in situ monitoring system for geological conditions of the natural gas hydrate reservoir of FIG. 1.
Detailed Description
In order to make the objects, technical solutions, design methods, and advantages of the present invention more apparent, the present invention will be further described in detail by specific embodiments with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not as a limitation. Thus, other examples of the exemplary embodiments may have different values.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
The invention provides a natural gas hydrate reservoir geological condition in-situ monitoring system aiming at exploration of natural gas hydrate reservoir geological conditions, the whole system is high in integration degree, and a set of integrated exploration device can be formed to perform in-situ exploration on the natural gas hydrate reservoir conditions.
Specifically, referring to fig. 1 and 2, the system comprises a high-resolution multichannel seismic exploration system 1, a battery compartment 2, an automatic cable laying and retracting system 3, an electrical slip ring 4, an acoustic communication system 5 and a main body frame 6. The high-resolution multi-channel seismic detection system 1 is composed of an electric spark seismic source electronic cabin 10, a seismic source emission head 11, a small-track-pitch multi-channel receiving cable 12 and a data acquisition electronic cabin 13; the automatic cable arrangement and retraction system 3 is composed of a retraction winch 31, a motor 32 and an automatic cable arrangement device 33; the high-resolution multichannel seismic detection system 1, the battery cabin 2 and the automatic cable arrangement and retraction system 3 are directly fixed on the main body frame 6; the electric slip ring 4 is fixed on the retracting winch 31, and the acoustic communication system 5 is arranged in the data acquisition electronic cabin 13.
Specifically, the battery cabin 2 directly supplies power to the high-resolution multichannel seismic detection system 1, the receiving cable is arranged in an area to be surveyed through the automatic cable arrangement and retraction system 3, and the generated seismic waves are collected and transmitted by the acoustic communication system 5, so that the related information of the natural gas hydrate reservoir condition is inferred.
The high-resolution multichannel seismic detection system 1 comprises an electric spark seismic source electronic cabin 10, a seismic source emission head 11, a small-track-pitch multichannel receiving cable 12 and a data acquisition electronic cabin 13. The electric spark source electronic cabin 10 is connected with the data acquisition electronic cabin 13 through a watertight cable and an electric slip ring 4, so that communication between the electric spark source and data acquisition is realized. The electric spark source electronic cabin 10 can be designed by adopting a high-voltage/high-frequency charging loop, a high energy storage density capacitor and a single-pulse discharging loop topological structure, so that rapid charging and discharging can be realized, and the power density and the sound source grade can be further improved. The electric spark seismic source adopted by the embodiment of the invention has higher main frequency of the emission wavelet and shorter wavelength (compared with the airgun wavelet), and can realize the fine detection of the BSR (natural gas hydrate) by matching with a small track distance receiving cable (for example, 3.125 meters or less).
The seismic source emission head 11 may use, for example, low-frequency bipolar emission electrodes and array technology.
The battery compartment 2 is composed of a battery pack and a battery management system. The battery cabin is respectively connected with the electric spark source electronic cabin 10 and the acoustic communication system 5 through watertight cables, so that power supply for the electric spark source electronic cabin and the data acquisition electronic cabin is realized.
The automatic cable arranging and storing system 3 is composed of a storing and storing winch 31, a motor 32 and an automatic cable arranging device 33. The motor 32 is connected with the battery compartment 2 through a watertight cable, so that the motor is started and stopped.
The acoustic communication system 5 is connected with the data acquisition electronic cabin 13 through a watertight cable and an electric slip ring 4 to receive control instructions and transmit and receive data.
In the actual use process, the whole monitoring system can be hung on the seabed ground in an exploration area by depending on a retraction system of a mother ship, a plurality of receiving cables 12 with small distance are accurately distributed in advance by using an ROV (remote operated vehicle) or manpower, a battery compartment 2 supplies power to an electric spark seismic source compartment 10 and a data acquisition electronic compartment 13 through watertight cables, and a trigger switch in the electric spark seismic source compartment 10 releases the stored energy of a capacitor to a seismic source transmitting head 11 in a short time (microsecond to millisecond magnitude) to form high-energy pulse waves. The small-track-pitch multi-channel receiving cable 12 arranged on the seabed in advance receives a reflected signal of a pulse wave on a stratum interface, data are stored in the data acquisition electronic cabin 13 through the acoustic communication system 5, and a stratum section of a measured area can be obtained through data processing in the later period, so that the related information of the natural gas hydrate is analyzed.
In conclusion, the natural gas hydrate reservoir geological condition in-situ monitoring system provided by the invention integrates a high-resolution multi-channel seismic detection system, a battery cabin, an automatic cable arrangement and retraction system, an acoustic communication system and the like, and can monitor the geological condition of the seabed natural gas hydrate reservoir in situ. The problems that the conventional geophysical exploration technology is low in exploration resolution and cannot monitor in situ are solved, and the resolution can reach within 0.5 m. Practice proves that the system can effectively explore the geological conditions of the natural gas hydrate reservoir.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen in order to best explain the principles of the embodiments, the practical application, or improvements made to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (6)
1. The in-situ monitoring system for geological conditions of the natural gas hydrate storage layer is characterized by comprising a high-resolution multichannel seismic detection system, a battery cabin, an automatic cable arrangement and retraction system, an electric slip ring, an acoustic communication system and a main body frame, wherein the main body frame is used for bearing the high-resolution multichannel seismic detection system, the battery cabin, the automatic cable arrangement and retraction system, the electric slip ring and the acoustic communication system; the battery cabin is used for supplying power to the high-resolution multichannel seismic detection system, the automatic cable arrangement and retraction system is used for arranging a receiving cable in an area to be surveyed, and the acoustic communication system is used for collecting generated seismic waves and further deducing related information of the natural gas hydrate reservoir condition.
2. The in-situ monitoring system for geological conditions of a natural gas hydrate reservoir as claimed in claim 1, wherein the high-resolution multichannel seismic detection system comprises an electric spark source electronic cabin, a source emission head, a small-distance multichannel receiving cable and a data acquisition electronic cabin, wherein the electric spark source electronic cabin is connected with the data acquisition electronic cabin through a watertight cable and an electric slip ring to realize communication between an electric spark source and data acquisition.
3. The in situ monitoring system for geological conditions of a natural gas hydrate reservoir as recited in claim 2, wherein the seismic source transmitting head employs low frequency bipolar transmitting electrodes and an array technique.
4. The in situ monitoring system for geological conditions of a natural gas hydrate reservoir as claimed in claim 2, wherein the battery compartment comprises a battery pack and a battery management system, and wherein the battery compartment is connected with the electric spark source electronic compartment and the acoustic communication system through watertight cables to supply power to the electric spark source electronic compartment, the acoustic communication system and the data acquisition electronic compartment.
5. The in-situ monitoring system for geological conditions of a natural gas hydrate storage layer according to claim 1, wherein the automatic cable arrangement and retraction system comprises a winch, a motor and an automatic cable arrangement device, wherein the motor is connected with the battery compartment through a watertight cable to realize the starting and stopping of the motor.
6. The in situ monitoring system for geological conditions of a natural gas hydrate reservoir as claimed in claim 2 wherein the acoustic communication system is connected to the data acquisition electronics bay via watertight cables and electrical slip rings to receive control commands and transmit and receive data.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911283308.0A CN112987102A (en) | 2019-12-13 | 2019-12-13 | In-situ monitoring system for geological conditions of natural gas hydrate storage layer |
| PCT/CN2020/129517 WO2021115057A1 (en) | 2019-12-13 | 2020-11-17 | In-situ monitoring system for geological conditions of natural gas hydrate reservoir |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911283308.0A CN112987102A (en) | 2019-12-13 | 2019-12-13 | In-situ monitoring system for geological conditions of natural gas hydrate storage layer |
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| CN112987102A true CN112987102A (en) | 2021-06-18 |
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| CN201911283308.0A Pending CN112987102A (en) | 2019-12-13 | 2019-12-13 | In-situ monitoring system for geological conditions of natural gas hydrate storage layer |
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| WO (1) | WO2021115057A1 (en) |
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| CN101441274A (en) * | 2008-12-24 | 2009-05-27 | 中国科学院地质与地球物理研究所 | Ocean-bottom seismograph for natural gas hydrate exploration |
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| CN102565870B (en) * | 2011-12-12 | 2014-11-05 | 中国地质科学院矿产资源研究所 | Deep-sea visual geochemical multi-parameter in-situ comprehensive detection system |
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2019
- 2019-12-13 CN CN201911283308.0A patent/CN112987102A/en active Pending
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2020
- 2020-11-17 WO PCT/CN2020/129517 patent/WO2021115057A1/en active Application Filing
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| US20160124105A1 (en) * | 2014-10-29 | 2016-05-05 | Seabed Geosolutions B.V. | Touch down monitoring of an ocean bottom seismic node |
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Application publication date: 20210618 |