UsingG佃eralized RRI M e t h o dKazunobuY品仏NE 1 ), S h i n j i TAKASUGI 2 ),H e e J o o n KIM 3 ) 四d K iHaLEE 4 ) l ) G e o t h e r m a l E n e r g y R e s e a r c h a n d D e v e l o p m e n t Co. , L t d . , T o k y o 103-0026, J a p a n .2)品i[C G田thermal E n g i n e e r i n g Co., Ltd., T o k y o 103-0016, J a p a n 3
MT and AMT surveys were conducted in the Minami-Kayabe area, southern Hokkaido, over a period of about two months in the fall of 1988. In this survey, 161 sites were arranged in a square lattice shape. FFT techniques were used in the initial data processing in 1998. Here we describe improved data processing using the cascade decimation technique. Data were processed efficiently by constructing a system using coherency and remote-reference. More than 10 sets of threshold values for the coherencies of (Ex, Hy) and (Ey, Hx) were then determined. Power spectra were sorted by these threshold values and then stacked. Satisfactory results were obtained for the frequency range from 3.4 Hz to 250 Hz. At frequencies below 3.4 Hz, however, the result of cascade decimation was not satisfactory because a sufficient number of stacks could not be obtained due to high local noise and limited measurement time.
The controlled source electromagnetic (CSEM) method may be the most significant new technology for oil and gas exploration since the development of 3-D seismic 20 years ago. The promise for the technology lies in its ability to differentiate resistive, potentially oil-bearing intervals from surrounding, more conductive water-bearing units. The principal is the same as that used in well logging devices to identify hydrocarbon zones in well bores. The technique is not new but the capability to resolve relatively thin resistive intervals in the depth domain offers new promise to lower risk through direct hydrocarbon indicators in conjunction with modern seismic methodsWe evaluated the sensing capability of the marine CSEM method to detect a thin hydrocarbon reservoir in deep, intermediate and shallow marine environments by analyzing the synthetic responses and the related physics using numerical modeling techniques. We would like to investigate the physics of marine CSEM using 1-D modeling program. The scope of investigation involved, all possible source-receiver configurations, advantages and disadvantages of frequency-versus time-domain systems, advantages and disadvantages of electric versus magnetic field measurements, a range of source-receiver separations including the coincident situation, and finally the air wave effect.
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