中国大陆科学钻探孔区反射地震剖面的数值模拟与分析
|
摘要
本文初步分析了苏鲁超高压变质带大陆科学钻探孔区的地震波速度结构,在此基础上对在东海孔区三维反射地震勘探过井孔的NNW-SSE主剖面和该周围地区的DH99二维反射地震剖面进行了数值模拟分析。结果表明,数值理论模拟结果与三维反射主剖面地震波到时吻合良好,模拟法能实现有效的时深转换,也表明数值模拟中采用的速度结构是合理的。东海钻井孔区实施反射地震勘测,所得地震记录剖面图是单-P波记录,在超高压变质岩区反射地震记录图中S波的影响甚微。DH99二维反射地震剖面的模拟结果表明东海孔区2000米深度以上的密度,波速结构不随深度加大而变化;而且苏鲁超高压变质岩区地表浅层的地震波速和密度较高,是高速高密地区。岩心结果反映的反射地震阻抗差大的地段,数值模拟的理论剖面上强反射面与孔区反射地震剖面图中的强反射体基本吻合。它意味着在非沉积层的结晶岩区,反射地震勘测手段是研究地下复杂结构的有效方法。数值模拟方法可以进一步提取地震反射记录信息,是利用地震反射方法研究地球构造的一种有效的方法。
In the present analysis the seismic velocity structure in the borehole area of Chinese continental scientific drilling was analyzed. Numerical simulations of profiles after stacking crossing the borehole in NNW-SSE direction for a 3-D reflection seismic survey and the DH99 2-D reflection seismic survey were carried out based on the structure analysis. The results suggest that arrival times in the simulated profile coincide well with those in observed profile after stacking, and the simulation can well perform the time-depth transformation. It implies that the structure in the borehole area used in the present analysis is available. The component of P-wave dominates in the reflection seismic profile, the component of S-wave can be neglected. The medium of high velocity and high density exists in the Sulu area, the velocity does not vary with the depth increase shallower than 2000m. The depths with large wave amplitudes in the numerical simulated profile using the velocity and density determined from the well log coincide almost with strong reflectors in the recorded seismic profile after stacking. It implies that the reflection seismic survey is a available strategy investigating the structure in the Sulu ultra-high pressure metamorphosed terrace. The numerical simulation is also a useful technique for investigation the structure because it can recover much information from the reflection profile.
In the present analysis the seismic velocity structure in the borehole area of Chinese continental scientific drilling was analyzed. Numerical simulations of profiles after stacking crossing the borehole in NNW-SSE direction for a 3-D reflection seismic survey and the DH99 2-D reflection seismic survey were carried out based on the structure analysis. The results suggest that arrival times in the simulated profile coincide well with those in observed profile after stacking, and the simulation can well perform the time-depth transformation. It implies that the structure in the borehole area used in the present analysis is available. The component of P-wave dominates in the reflection seismic profile, the component of S-wave can be neglected. The medium of high velocity and high density exists in the Sulu area, the velocity does not vary with the depth increase shallower than 2000m. The depths with large wave amplitudes in the numerical simulated profile using the velocity and density determined from the well log coincide almost with strong reflectors in the recorded seismic profile after stacking. It implies that the reflection seismic survey is a available strategy investigating the structure in the Sulu ultra-high pressure metamorphosed terrace. The numerical simulation is also a useful technique for investigation the structure because it can recover much information from the reflection profile.
引文
Cerjan C, Kosloff D, Koskoff R and Reshef D. 1985． A nonreflecting boundary condition for discrete acoustic and elastic wave equations, Geophysics, 50: 705-708
Cong B L, Wang Q C and Zhai M G. 2000． New data regarding hotly topics concerning UHP metamorphism of the Dabie-Sulu belt, East Central China. In: W G Ernst & J G liou (eds.). Ultra-high Pressure Metamorphism and Geodynamics in Collision-type Orogenic Belts, California: Bellwether Publishing Co. , 181-189
Ernst W G, Liu G J and Coleman R G. 1995． Comparative petrotectonic study of five Eurasia ultrahigh-pressure metainorphic complexes. Int. Geol. Rev. , 37:191-211
Kern H, Gao S, Jin Z, Popp T and Jin S. 1999． Petrophysical studies on rocks from the Dabie ultrahigh-pressure ( UHP) metamorphic belt, central China: implications for the composition and delineation of the lower crust. Tectophysics, 301:191-215
Schmid R, Ryberg T and Ratschbacher L. 2001． Crustal structure of the eastern Dabie Shan interpreted from deep reflection and shallow tomographic data. Tectonophysics, 333: 347-359
Tsuru T. 2001． Consideration on basal erosion along the plate boundary and interplate earthquake activity at the Japan Trench subduction zone. Butsuri-Tansa, 54: 21-30
Tsuru T, Park J 0． 2001． Tectonic features of the Japan trench convergent margin off Sanriku, northeastern Japan revealed by multichannel seismic reflection data. J. Geophys. Res. , 105: 16403-16413
Xu Jiren and Yoshiteru Kono. 2002． Geometry of slab, intraslab stress field and its tectonic implication in the Nankai Trough, Japan. Earth Planes and Space, 54:733-742
Xu Jiren, Zhao Zhixin, Kono Yoshiteru, Kinoshita Hajimu. 2003． Regional stress field and its tectonic characteristics in the Nankai Trough, Japan. Chinese J. Geophys. , 46: 488-494 ( in Chinesewith English abstract)
Xu JR and Zhao ZX. 2004． Regional structure characteristics of crustalroot of mountain beneath the Sulu orogenic belt. Acta PetrologicaSinica, 20(1) :137-144 (in Chinese with English abstract)
Xu Z Q, Yang W C, Zhang Z M and Yang T N. 1998． Scientificsignificance and site-selection researches of the first Chinesecontinental scientific deep drillhole. Continental Dynamics, 3(1) :1-13
Xu Z Q, Zhang W, Lu F L. 2002． Progress on the pilot-hole of ChineseContinental Scientific Drilling, Newsletter, 33-34
Yang WC and Yu CQ. 2001． Kinetics and Dynamics of development ofthe Daibie-Sulu UHPM terranes based on Geophysical evidences.Chinese J. Geophys. , 44: 434-358 (in Chinese with Englishabstract)
Yang W C. 2003． Layered mantle reflectors in Dabie-Sulu and theirinterpretation. Chinese J. Geophys. , 46: 191-196 ( in Chinesewith English abstract)
Yu Q F and Guo Y Z. 2002． Physics characteristics of rocks in the borehole area in the Chinese Continental Scientific Drilling in Sube,China. Chinese J. Geophys. , 45:93-100 (in Chinese with Englishabstract)
Zhao Zhixin, Kazuo Oike, Kazuo Matsumara, Yuzo Ishikawa. 1990． Stress field in the continental part of China-Derived from temporalvariations of seismic activity. Tectonophysics, 178: 357-372
Zhao Zhixin, Ryuji Kubota, Fumio Suzuki and Susumu Iizuka. 1997． Crustal structure in the southern Kento-Tokai region derived from thetomographic method for seismic explosion survey. Journal of Physicsof the Earth, 45:433-453
Zhao Z X, Xu J R and Horiuchi S. 2001． Differentiation operator in thewave equation for the pseudospectral method with a staggered mesh.Earth Planets Space, 53:327-332
Zhao Z X, Xu J R and Horiuchi S. 2003． Staggered grid real value FFTdifferentiation operator and its application for wave propagationsimulation in heterogeneous medium. Chinese J. Geophys. , 46: 234-240 (in Chinese with English abstract)
Zhao Zhixin, Xu Jiren, Kubota Ryuji, Wakizawa Yasuhiko and KajikawaSyozo. 2004． Collapse ratios of buildings due to the 1995 Kobeearthquake and interference between S-wave and the second surfacewave at basin edge. Chinese Science Bulletin, 49: 1-7 (inChinese )
Zhao Zhixin, Xu Jiren. 2004． Basin geological structure and thesimulations for mechanism of seismic disast
Cong B L, Wang Q C and Zhai M G. 2000． New data regarding hotly topics concerning UHP metamorphism of the Dabie-Sulu belt, East Central China. In: W G Ernst & J G liou (eds.). Ultra-high Pressure Metamorphism and Geodynamics in Collision-type Orogenic Belts, California: Bellwether Publishing Co. , 181-189
Ernst W G, Liu G J and Coleman R G. 1995． Comparative petrotectonic study of five Eurasia ultrahigh-pressure metainorphic complexes. Int. Geol. Rev. , 37:191-211
Kern H, Gao S, Jin Z, Popp T and Jin S. 1999． Petrophysical studies on rocks from the Dabie ultrahigh-pressure ( UHP) metamorphic belt, central China: implications for the composition and delineation of the lower crust. Tectophysics, 301:191-215
Schmid R, Ryberg T and Ratschbacher L. 2001． Crustal structure of the eastern Dabie Shan interpreted from deep reflection and shallow tomographic data. Tectonophysics, 333: 347-359
Tsuru T. 2001． Consideration on basal erosion along the plate boundary and interplate earthquake activity at the Japan Trench subduction zone. Butsuri-Tansa, 54: 21-30
Tsuru T, Park J 0． 2001． Tectonic features of the Japan trench convergent margin off Sanriku, northeastern Japan revealed by multichannel seismic reflection data. J. Geophys. Res. , 105: 16403-16413
Xu Jiren and Yoshiteru Kono. 2002． Geometry of slab, intraslab stress field and its tectonic implication in the Nankai Trough, Japan. Earth Planes and Space, 54:733-742
Xu Jiren, Zhao Zhixin, Kono Yoshiteru, Kinoshita Hajimu. 2003． Regional stress field and its tectonic characteristics in the Nankai Trough, Japan. Chinese J. Geophys. , 46: 488-494 ( in Chinesewith English abstract)
Xu JR and Zhao ZX. 2004． Regional structure characteristics of crustalroot of mountain beneath the Sulu orogenic belt. Acta PetrologicaSinica, 20(1) :137-144 (in Chinese with English abstract)
Xu Z Q, Yang W C, Zhang Z M and Yang T N. 1998． Scientificsignificance and site-selection researches of the first Chinesecontinental scientific deep drillhole. Continental Dynamics, 3(1) :1-13
Xu Z Q, Zhang W, Lu F L. 2002． Progress on the pilot-hole of ChineseContinental Scientific Drilling, Newsletter, 33-34
Yang WC and Yu CQ. 2001． Kinetics and Dynamics of development ofthe Daibie-Sulu UHPM terranes based on Geophysical evidences.Chinese J. Geophys. , 44: 434-358 (in Chinese with Englishabstract)
Yang W C. 2003． Layered mantle reflectors in Dabie-Sulu and theirinterpretation. Chinese J. Geophys. , 46: 191-196 ( in Chinesewith English abstract)
Yu Q F and Guo Y Z. 2002． Physics characteristics of rocks in the borehole area in the Chinese Continental Scientific Drilling in Sube,China. Chinese J. Geophys. , 45:93-100 (in Chinese with Englishabstract)
Zhao Zhixin, Kazuo Oike, Kazuo Matsumara, Yuzo Ishikawa. 1990． Stress field in the continental part of China-Derived from temporalvariations of seismic activity. Tectonophysics, 178: 357-372
Zhao Zhixin, Ryuji Kubota, Fumio Suzuki and Susumu Iizuka. 1997． Crustal structure in the southern Kento-Tokai region derived from thetomographic method for seismic explosion survey. Journal of Physicsof the Earth, 45:433-453
Zhao Z X, Xu J R and Horiuchi S. 2001． Differentiation operator in thewave equation for the pseudospectral method with a staggered mesh.Earth Planets Space, 53:327-332
Zhao Z X, Xu J R and Horiuchi S. 2003． Staggered grid real value FFTdifferentiation operator and its application for wave propagationsimulation in heterogeneous medium. Chinese J. Geophys. , 46: 234-240 (in Chinese with English abstract)
Zhao Zhixin, Xu Jiren, Kubota Ryuji, Wakizawa Yasuhiko and KajikawaSyozo. 2004． Collapse ratios of buildings due to the 1995 Kobeearthquake and interference between S-wave and the second surfacewave at basin edge. Chinese Science Bulletin, 49: 1-7 (inChinese )
Zhao Zhixin, Xu Jiren. 2004． Basin geological structure and thesimulations for mechanism of seismic disast
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心