基于地震环境噪声的油页岩勘探

doi:10.11720/wtyht.2021.1320

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Abstract

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.

Key words： seismic ambient noise oil shale cross correlations of common central panel Songliao Basin

Received: 18 June 2020 Published: 20 August 2021

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	Articles by authors
	Hong-Xing LI
	Shun-Jia TAN
	Zhen-An YAO
	Guang-Nan HUANG
	Pei-Yuan XU
	Jie ZHOU
	Li-Fei FAN

Cite this article:

Hong-Xing LI,Shun-Jia TAN,Zhen-An YAO, et al. Oil shale exploration based on seismic ambient noise[J]. Geophysical and Geochemical Exploration, 2021, 45(4): 898-905.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2021.1320 OR https://www.wutanyuhuatan.com/EN/Y2021/V45/I4/898

Bisic principle of microtremor survey method
a—seismic ambient noise;b—surface wave dispersion;c—shear wave velocity

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 21^st common center unit

Coherence coefficient
a—coherence coefficient of a common center unit;b—coherence coefficient of 3 Hz wave

Surface wave dispersion spectrum

Apparent shear wave velocity profile

Borehole logging information

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