|
| | Abstract | | From the viewpoint of earthquake engineering and civil engineering, the microtremor array survey is considered as a relatively convenient method for S-wave velocity. To investigate the feasibility for the oil and gas prospecting, the microtremor array survey was tested in and around Amarume, Yamagata Prefecture, Japan and its technical applicability was rigorously examined. As a result this method is considered as a cost effective tool which can grasp the long-wavelength structure of target layer. Because the inversion method does not give a unique solution, the analysis involves some interpretation by processors and it may cause an analytical error. The integrated analysis combined with the gravity data is thought as an effective way to decrease such an error and to improve the accuracy of underground structure. Recently several applications of microtremors are reported for the oil and gas prospecting in foreign countries, suggesting significant correlation between Low Frequency (LF) attributes and the distribution of oil and gas reservoir. Our study indicates that their proposed seismic attributes show no clear indication in Amarume oil field so far but there still remains the possibility of V/H spectrum obtained by 3-component observations as a direct hydrocarbon indicator. |
|
|
|
| |
|