NDLI: Distinguishing oil and water layers in a porous cracked medium by interpreting acoustic logging data on the basis of Hudson Theory

Content Provider	Springer Nature Link
Author	Zhang, Xue’ang Wang, Zhuwen Yang, Zhichao
Copyright Year	2017
Abstract	During surveys, water layers may interfere with the detection of oil layers. In order to distinguish between oil and water layers in a porous cracked medium, research on the properties of cracks and oil and water layers and their relation to acoustic logging rules is essential. On the basis of Hudson’s crack theory, we simulated oil and water layers in crack-porous medium with different crack parameters corresponding to the well-field response. We found that in a cracked medium with high crack angle or low number density of cracks, compressional and shear wave velocities are sensitive to crack characteristics; further, these velocities are more sensitive to crack characteristics when the waves propagate through the water layer than when they propagate through the oil layer. Compressional and shear wave velocities increase with an increase in crack angle: in the water layer, the increase is approximately linear. On comparing the full waveforms observed in the oil and water layers, we find that the amplitudes of most waves are higher in the water layer. Among the considered waves, the Stoneley wave suffers maximum amplitude attenuation in the oil layer. The maximum excitation intensity for oil layer is greater than that for the water layer. These results can guide further cracked media logging field exploration work.
Starting Page	500
Ending Page	506
Page Count	7
File Format	PDF
ISSN	1674487X
Journal	Journal of Earth Science
Volume Number	28
Issue Number	3
e-ISSN	1867111X
Language	English
Publisher	China University of Geosciences
Publisher Date	2017-06-10
Publisher Place	Wuhan
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	crack acoustic logging Hudson theory numerical simulation reservoir Earth Sciences Geotechnical Engineering & Applied Earth Sciences Biogeosciences Geochemistry Geology
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences

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