By Francis G. Stehli (auth.), Dr. C. Barry Raleigh (eds.)
Drilling deep into the earth holds a fascination for earth scientists derived partly from the truth that the drill gap is the last word try of a speculation. while floor exploration equipment were absolutely uti lized and all of the geological inferences drawn in regards to the constitution be neath the skin, we needs to eventually drill to pattern without delay the 3rd measurement of the crust of the earth. The drill is hence the software of selection of the power and minerals re assets undefined. as a result of excessive rate, drilling has been simply sparing ly used for fixing primary difficulties within the earth sciences. yet now, having used the really refined technique of exploration geophysics, the intriguing structural aspect rising from seismic re flection profiling particularly has led a number of international locations to start a huge software of clinical drilling to unravel a few of the significant prGb lems within the earth sciences. Hhat is defined during this quantity are the blueprints for nationwide re seek courses in France, the Federal Republic of Germany, Japan and the USA. The Soviet Union has already launched into an incredible drilling attempt, the result of that are quickly to be released. effects, after all, are nonetheless few, and this primary quantity is extra taken with the issues to be solved.
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Extra info for Observation of the Continental Crust through Drilling I: Proceedings of the International Symposium held in Tarrytown, May 20–25, 1984
Sample text
V. ~ " . ,. ~"'" .... Il-lO , . #. '. _-- ..... "" --............. ______ . ~ " ... ~ ... :. ,----- 1///1//11,/ , " f of. ///III,~ - -- .. , " . ' ~ ........... "" 'J ' . '. 1 ' • . "• ';'. .. :j:. " . I ' . '. 0 1,0 lUI , . ,. 42 as the final one. ling down to 5000 m depth in 1968. Figure 2 shows a typical cross-section of the North-East Japan Arc at the stage of discussion where scientists were concerned with the sedimentary sequences with geosynclinal sedimentary bodies. The major purpose of the drilling was to collect the basement rocks overlaid by Silur-Devonian Geosyncline.
8 . 35 The white-grey, feldspar-rich sandstones show a relatively high porosity (average porosity 18%), notwithstanding the frequent occurrence of post-sedimentary vermicular kaolinite crystals. However, the permeability of these sandstones is medium (usually below 50 md). This means that the Neeroeteren Sandstones represent a potential reservoir for gaseous hydrocarbons. It is expected that these extend to the northeast below the Roer Valley Graben or Central Netherlands Graben, whereas a change towards more clay/silt-dominated deposits has been observed in western directions (Fig.
Kimura of Japan National Oil Corporation for informations on the recent drilling activities for geothermal energy and oil-gas exploitations, Y. Saito of the National Science Museum, Tokyo, A. Taira of Tokyo University, G. Kimura of Kagawa University, S. Maruyama of Toyama University, M. Hashimoto, K. Amano, and M. Takahashi of Ibaragi University for discussions on the tectonic evolution of Japanese Island Arcs, and S. Honjo of Woods Hole Oceanographic Institution for reviewing the manuscript. References Hanzawa S (1940) Micropaleontological studies of drill cores from a deep well in Kita-daito-zima (North Borodino Island).