平成24（2012）年度　共同利用登録実施報告書

課題番号	24−共研−19	分野分類		統計数理研究所内分野分類		a
				主要研究分野分類		4
研究課題名	地下の波動伝搬の特性に関する研究
フリガナ 代表者氏名	カサハラ ジュンゾウ 笠原 順三		ローマ字		Kasahara Junzo
所属機関	東京海洋大学
所属部局	産学地域連携推進機構
職　　名	客員教授

研究目的と成果の概要

From the development of time lapse technologies for EOR (Enhanced Oil Recovery) and CCS (Carbon Capture and Storage), the use of a very stable and continuous seismic source called ACROSS with multi-geophones is suitable. We are in the process of applying a seismic ACROSS in the context of carbonate rocks in Saudi Arabia. The Al Wasee water pumping site approximately 120 km east of Riyadh has been selected as a trail-site. The intention is to observe the changes in aquifers induced by pumping operations. One ACROSS source unit was installed at the Al Wasee site in December 2011. The instrument has been operated from 10 to 50 Hz with 40 ton -f at 50 Hz. Using alternatively clockwise and counter-clockwise rotations we can synthesize vertical and horizontal forces, respectively. 31 three-components in 2 km x 3 km area and two nearby geophones have been used to monitor the seismic changes from pumping the water. In this study we will show the first results obtained in this field. The results show very large waveform change during two weeks and daily variation.