Oil shale exploration based on seismic ambient noise
LI Hong-Xing1(), TAN Shun-Jia1,2, YAO Zhen-An1, HUANG Guang-Nan1, XU Pei-Yuan2, ZHOU Jie2, FAN Li-Fei2
1. State Key Laboratory of Nuclear Resources and Environment,East China University of Technology,Nanchang 330012,China 2. Beijing Laolei Geophysical Exploration Instrument Co.,Ltd.,Beijing 100025,China
As oil shale is an important unconventional oil and gas resource,its exploration and development has received increasing attention.Microtremor exploration based on seismic ambient noise is a passive,efficient and low-cost method of seismic exploration,which can be used to image the shear wave velocity of underground medium and can become a potential new exploration method for oil shale more in line with the requirements of "environmental protection".For the first time,the authors applied microtremor method to oil shale exploration based on the spatial cross correlations of common central panel and conducted a study of the identification of oil shale in Songliao Basin.The results show that the geometry of microtremor method can be flexible according to the real situation,the shear wave velocity profile corresponds well with the results of borehole cataloging near the survey line and the main stratum is well divided.The second member of the Nenjiang Formation,which is mainly oil-bearing shale,exhibits low velocity characteristics.
Geometry of CMP-SPAC method a—linear common center observation systerm;b—two dimensional common center unit observation systerm
Equipment
Designed geometry
Actual geometry (the seven colors represent the seven array observations) a—gephone position distribution;b—center position of geophone pairs distribution
Common center unit a—division of common center unit(purple dotted box);b—the ray distribution between the detectors used for the 21st common center unit
Coherence coefficient a—coherence coefficient of a common center unit;b—coherence coefficient of 3 Hz wave
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