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geothermal method
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  地热
     The progress on marine geophysical studies of gas hydrates is presented in the aspects of seismic method, logging method, geothermal method and rock physics, and the prospect in the future is expected.
     本文从地震、测井、地热、岩石物性 4个方面阐述天然气水合物的海洋地球物理研究现状 ,并展望其发展前景
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     Method. u.
     方法:利用紫外分光光度法和溶解度法。
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     Method
     方法
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     Comprehensive Evaluation Method of the Geothermal Resources
     地热资源综合评价方法
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     AN OIL-FINDING METHOD BY GEOTHERMAL ANOMALY
     地温找油法
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Temperature at the surface, determined principally by climate, serves as a boundary condition for establishing the thermal regime at shallow depths. The past changes of temperature at the surface transmitted down to subsurface by thermal conduction and were recorded as transient perturbations to a steady state temperature field. Recent efforts made by the international geothermal community in reconstructing the surface temperature history have demonstrated that borehole temperatures comprise valuable information...

Temperature at the surface, determined principally by climate, serves as a boundary condition for establishing the thermal regime at shallow depths. The past changes of temperature at the surface transmitted down to subsurface by thermal conduction and were recorded as transient perturbations to a steady state temperature field. Recent efforts made by the international geothermal community in reconstructing the surface temperature history have demonstrated that borehole temperatures comprise valuable information about climate changes over the past few centuries.Both forward and inverse methods have been developed and employed by various authors in deriving climate information from borehole temperatures.Compared to other techniques in paleoclimate studies, the geothermal method of climate reconstruction has its limitations, such as lower resolution and shorter recoverable climate history. But it also has many remarkable advantages:(1) it is based on the well developed analytical theory of heat conduction rather than on an empirical relationship; (2)its concrete theoretical foundation makes the use of both forward and inverse methods possible;(3)it can directly reconstruct surface temperature, and therefore is free of uncertainties arising from conversion of proxy data to temperatures; (4) climate signals preserved in subsurface temperatures are usually less disturbed by anthropogenic sources; (5) the existing archives of borehole temperature data endow the geothermal technique with great potential for a world-wide study; and (6) the time interval for which this method displays its best resolving power covers both the industrial and preindustrial periods, facilitating an assessment of the greenhouse effect in global warming.Results from northeast United States, southeast Canada, and the Panxi area of southwest China are presented as examples of the application of this geothermal method. Investigations of the borehole temperature profiles selected from these areas show a warming with amplitudes of 0.6-2.1℃ typically over the last 300 years.The results inferred from the geothermal data are in general agreement with regional and global meteorological records, which significantly extend our knowledge about the surface temperature history.

地壳浅层的地温分布与过去一定时期的地表温度变化之间有着内在的联系,地温场记录着地表温度变化的历史。由于地表温度是描述气候变化的重要参数,通过对钻孔地温数据进行分析处理,可以达到研究古气候变化的目的。美国东北部、加拿大东南部和中国四川攀西地区若干钻孔地温剖面的反演结果一致表明,这些区域在过去数百年间地表温度均有不同程度的升高。与研究古气候的其他方法相比,地热方法具有理论基础牢固和现成数据基础庞大的突出特点,这一研究方法在世界范围的广泛应用必将有助于揭开全球气候变化的奥秘。

Geophysical methods have played an important role in compilation and comprehensive reseach of global geoscience transects in China; paleomagnetism is used to study the formation and evolution of China’s continent; man-made seismic prospecting becomes the major technique in exploring the earth's crust; reflection shooting, in particular, is able to probe detailed structures of the crust and provide abundant deep information; MT is a popularly accepted method for deep exploration in China, which is...

Geophysical methods have played an important role in compilation and comprehensive reseach of global geoscience transects in China; paleomagnetism is used to study the formation and evolution of China’s continent; man-made seismic prospecting becomes the major technique in exploring the earth's crust; reflection shooting, in particular, is able to probe detailed structures of the crust and provide abundant deep information; MT is a popularly accepted method for deep exploration in China, which is used to investigate high-conductive layers whithin the crust and lithospheric mantle; gravity, magnetic and geothermal methods have made new developments in both methodology and practice for solving geological problems; computers were made full use of to develop a series of man-machine interactive systems in comprehensive geophysical interpretation; remarkable results were obtained in digitizing geological information on PCs, which have received widespread acclaim both form China and abroad. This project has attained advanced world levels and wan honour for our counter.

地球物理在中国地学断面图的编制和综合研究中起着重要的作用.简要地概述了古地磁用于研究中国大陆的形成与演化;人工地震,特别是反射地震成功地用于研究地壳细结构;大地电磁用于了解壳内和岩石圈地幔的高导层;重、磁、地热,无论在方法上还是在解决地质问题上均取得了新进展.在综合解释上,研制出多种地球物理方法的人机交互解释系统,以及研制出在微机上实现数字化等成果.简介了地学断面成果受到国外同行的广泛重视.最后提出了地学断面研究的展望.

Gas hydrates on continental margins have become important objects for marine geophysical studies since the late 20th century. The progress on marine geophysical studies of gas hydrates is presented in the aspects of seismic method, logging method, geothermal method and rock physics, and the prospect in the future is expected.

赋存于大陆边缘的天然气水合物是 2 0世纪后期海洋地球物理的一个重要研究对象 .本文从地震、测井、地热、岩石物性 4个方面阐述天然气水合物的海洋地球物理研究现状 ,并展望其发展前景

 
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