Ocean floor heat flow long-time observed data collecting method

Inactive Publication Date: 2015-04-29
SOUTH CHINA SEA INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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  • Abstract
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  • Application Information

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Problems solved by technology

However, in these sea areas, the temperature of the bottom water tends to fluctuate greatly periodically, which causes the temperature of the seabed surface sediment to be also periodically affected, resulting in obvious changes in the geothermal gradient measured at the same station at different times, which cannot truly reflect the temperature of the station. Therefore, it is difficult to obtain reliable seabed heat flow with conventional seabed heat flow probes (Ewing type and Lister type probes) in sea areas with large bottom water temperature fluctuations.

Method used

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  • Ocean floor heat flow long-time observed data collecting method
  • Ocean floor heat flow long-time observed data collecting method
  • Ocean floor heat flow long-time observed data collecting method

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Embodiment 1

[0064] A data acquisition method for long-term observation of seafloor heat flow, comprising the following steps:

[0065] Step 1: In the sea area to be observed, use a gravity sampler to collect samples for sediment analysis, and determine the location of the long-term observation base station for seabed heat flow; at the same time, install a small probe outside the gravity sampler tube to obtain the in-situ location of the seabed surface sediments Thermophysical parameters, and measure the thermal conductivity of the collected sediment samples to calculate the heat flow;

[0066] The second step: if figure 1 As shown, the long-term observation base station of seabed heat flow is connected to the large-tonnage acoustic releasers 51 and 52 with buoyancy cables 61 and 62 respectively, and the length ratio of the two buoyancy cables 61 and 62 is 2m:50m; the large-tonnage acoustic releasers 51 and 52 are then connected to the end of the geological winch steel cable 7; then the b...

Embodiment 2

[0082] The difference between embodiment 2 and embodiment 1 is only that the structure of the cable cutting mechanism 3 used is different. Composed with activity hook 33B; such as Figure 12 with 13 As shown, the cable clamping plate 32B is a horizontally placed cuboid with a thickness more than twice the diameter of the cable, and cross-shaped grooves perpendicular to each other are opened on the lower surface of the cuboid, and the depth of the deeper groove 321B is shallower. 1.2-1.5 times of the depth of the groove 322B, the width of the shallower groove 322B is enough to embed the cable; the top of the blade box 31B is parallel to the deeper groove 321B and fixedly connected with the cable pressure plate 32B, and the blade box 31B is The upper 2 / 3 section of the side exposed part parallel to the trend of the deeper groove 321B is provided with a longitudinally extending through hole 311B; the inside of the blade box 31B is provided with a blade 312B, and the edge of the ...

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Abstract

The invention discloses an ocean floor heat flow long-time observed data collecting method which comprises the steps of ocean floor heat flow long-time observing base station placing station position determining, placing, adjusting, ocean floor heat flow long-time observing base station self-floating releasing recycling and the like. According to the ocean floor heat flow long-time observed data collecting method, the reliability and the success rate of placing and recycling of an ocean floor heat flow long-time observing base station placing station are greatly improved, ocean floor heat flow long-time observing risks are obviously lowered, equipment loss is lowered, the observing success rate is improved, and observing risks are lowered. Obtained long-time ocean floor temperature observed data can remove influence on ocean floor heat flow measuring from bottom water temperature fluctuation.

Description

technical field [0001] The invention relates to a seabed detection method, in particular to a data collection method for long-term observation of seabed heat flow. Background technique [0002] Terrestrial heat flow is the direct display of the earth's internal heat process on the seabed. It is not only a key parameter for understanding the earth's heat loss rate, but also the basic data for geodynamic research and reconstruction of sedimentary basin evolution, oil, gas and hydrate resource potential evaluation. Therefore, it is of national strategic significance to develop equipment to measure seabed heat flow. [0003] Seafloor heat flow can be measured with borehole temperature and seafloor heat flow probes. Due to the limited distribution area of ​​oil drilling and ocean drilling, the submarine heat flow probe is easy to carry on the ship, the operation is relatively flexible, the cost is low, and it can perform precise measurements according to actual scientific proble...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V9/00
Inventor 孙兆华杨小秋曾信施小斌
Owner SOUTH CHINA SEA INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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