Seismic Velocity Tomography and Poisson’s Ratio Imaging in Tarim Basin
详细信息
- 责任者：Qu Chen (Institute of Geology ; Chinese Academy of Geological Sciences ; Beijing 100037 ; China) ; Yang Wencai
- 刊名：Earth Science Frontiers
- 出版年：2013
- 卷期：20(5
- 关键词：地震勘探 ; seismic exploration ; 塔里木盆地 ; Tarim Basin
- 页码：p.196-206
- 图表：8 illus., 26 refs.
- 分类号：1600
- issnNo：ISSN1005-2321
- isbnNo：CN11-3370/P
摘要
What kind of lithospheric characteristics have been developed beneath large cratonic basins?What difference in the basin structures showed during their development?These issues received much concern in recent years.Seismic body wave tomography has been a powerful tool to study the crust and upper mantle structures and has gained world-wide acknowledgment in the 21century.So the seismic body wave tomography can be applied to the investigation of these problems.In this paper,3Dhigh-resolution P-and S-wave velocity structures of the crust beneath Tarim Basin are investigated with body wave tomography by using arrival time data from same source-receiver pairs.The resolution of P-and S-wave velocity models reaches 0.5°×0.5°laterally and 10km vertically,tested by some different grid steps.We analyze the obtained 3Dimages of the Pand S-wave velocity perturbation and Poisson’s ratio,interpret the crustal structures and compare differences between internal structure units within Tarim Basin.The results indicate that there are three areas that are good for oil/gas accumulation and preservation.These three areas are as follows:(1)Round Mangar depression;(2)the west part of Bachu uplift and Yecheng depression;(3)Tangutsbas and the east section of Maigait Slope.The crustal seismic anomaly distribution patterns are usually different from that beneath the Moho.But this crustal pattern at Shuntuoguole area in central Tarim Basin seems penetrating through the Moho.This kind of lithospheric structure must be distinct from general situation,being interpreted as"fingerprint"in the lithosphere,which was left by volcanism in the Permian.In conclusion,the homographic results have certain significance in oil and gas exploration.
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