常规土地垂直地震介绍(VSP ) 探索通常为接收装置使用 P 波浪来源和三部件的地震检波器，强调 P -- 并且变换 S 波浪。以前的研究证明从在表面的可控制的地震来源的两炸毁地上凿穿射击和垂直颤动将生产相对强壮的纯 P 波浪和更弱的纯 S...常规土地垂直地震介绍(VSP ) 探索通常为接收装置使用 P 波浪来源和三部件的地震检波器，强调 P -- 并且变换 S 波浪。以前的研究证明从在表面的可控制的地震来源的两炸毁地上凿穿射击和垂直颤动将生产相对强壮的纯 P 波浪和更弱的纯 S 波浪。大泊松的比率差别的接口在强壮的播送变换 S 波浪的形成上有积极影响。由从来源的纯 S 波浪的比较分析并且在去的 S 波浪下面变换了，当时，我们相信纯 S 波浪的主要频率通常比纯 P 波浪低主要频率在变变换下面， S 波浪接近 P 波浪的。我们学习了零偏移量并且从陆地 P 波浪的偏移量 VSP 数据采购原料。结果证明纯 S 波浪通常在波浪紧张与差别在这些数据存在。S 波浪速度能从 P 波浪来源被获得零偏移量的 VSP 数据。最后，我们讨论 VSP P 的联合申请的明亮的未来 -- 并且 S 波浪和在 P 波浪的 S 波浪的完整的使用采购 VSP 数据。展开更多
A method for determining medium quality factor is developed on the basis of analyzing the attenuation dispersion of the arrived first period P wave. In order to enhance signal to noise ratio, improve the resolution in...A method for determining medium quality factor is developed on the basis of analyzing the attenuation dispersion of the arrived first period P wave. In order to enhance signal to noise ratio, improve the resolution in measurement and reduce systematic error we applied the data resampling technique. The group velocity delay of P wave was derived by using an improved multi-filtering method. Based on a linear viscoelastic relaxation model we deduced the medium quality factor Qm, and associated error with 95% confidence level. Applying the method to the seismic record of the Xiuyan M=5.4 earthquake sequences we obtained the following result: 1 High Qm started to appear from Nov. 9, 1999. The events giving the deduced high Qm value clustered in a region with their epicenter dis- tances being between 32 and 46 km to the Yingkou station. This Qm versus distance observation obviously deviates from the normal trend of Qm linearly increasing with distance. 2 The average Qm before the 29 Dec. 1999 M=5.4 earthquake is 460, while the average Qm between the M=5.4 event and the 12 Jan. 2000 M=5.1 earthquake is 391, and the average Qm after the M=5.1 event is 204.展开更多
We present an example of using converted-waves for characterizing onshore gas reservoirs in the Ordos basin in Northwest China. The Ordos basin is the largest gas province in China. The main gas reservoirs （about 3 3...We present an example of using converted-waves for characterizing onshore gas reservoirs in the Ordos basin in Northwest China. The Ordos basin is the largest gas province in China. The main gas reservoirs （about 3 300 m in depth） are in upper Paleozoic sandstone that has low or reversed P-wave impedance and is immediately above a coal seam. This makes it very difficult to image the gas reservoirs using conventional P-wave data. Analysis of core, log and VSP data shows a weak PP reflection but a relatively strong PS-converted wave reflection, or both strong PP- and PS-reflections but with opposite polarity from the gas bearing sands, which indicates the potential of using PS-waves to image the gas reservoirs in the Ordos basin. Subsequently, thirteen seismic lines were acquired, processed and interpreted to verify the PP- and PS-responses, and two corresponding attributes （PP- and PS- amplitude ratio and polarity ratio） are used to map the reservoirs through joint PP and PS analysis.展开更多
文摘常规土地垂直地震介绍(VSP ) 探索通常为接收装置使用 P 波浪来源和三部件的地震检波器，强调 P -- 并且变换 S 波浪。以前的研究证明从在表面的可控制的地震来源的两炸毁地上凿穿射击和垂直颤动将生产相对强壮的纯 P 波浪和更弱的纯 S 波浪。大泊松的比率差别的接口在强壮的播送变换 S 波浪的形成上有积极影响。由从来源的纯 S 波浪的比较分析并且在去的 S 波浪下面变换了，当时，我们相信纯 S 波浪的主要频率通常比纯 P 波浪低主要频率在变变换下面， S 波浪接近 P 波浪的。我们学习了零偏移量并且从陆地 P 波浪的偏移量 VSP 数据采购原料。结果证明纯 S 波浪通常在波浪紧张与差别在这些数据存在。S 波浪速度能从 P 波浪来源被获得零偏移量的 VSP 数据。最后，我们讨论 VSP P 的联合申请的明亮的未来 -- 并且 S 波浪和在 P 波浪的 S 波浪的完整的使用采购 VSP 数据。
基金State Key Project of Science and Technology during the Tenth Five-year Plan (2004BA601B01-03-01).
文摘A method for determining medium quality factor is developed on the basis of analyzing the attenuation dispersion of the arrived first period P wave. In order to enhance signal to noise ratio, improve the resolution in measurement and reduce systematic error we applied the data resampling technique. The group velocity delay of P wave was derived by using an improved multi-filtering method. Based on a linear viscoelastic relaxation model we deduced the medium quality factor Qm, and associated error with 95% confidence level. Applying the method to the seismic record of the Xiuyan M=5.4 earthquake sequences we obtained the following result: 1 High Qm started to appear from Nov. 9, 1999. The events giving the deduced high Qm value clustered in a region with their epicenter dis- tances being between 32 and 46 km to the Yingkou station. This Qm versus distance observation obviously deviates from the normal trend of Qm linearly increasing with distance. 2 The average Qm before the 29 Dec. 1999 M=5.4 earthquake is 460, while the average Qm between the M=5.4 event and the 12 Jan. 2000 M=5.1 earthquake is 391, and the average Qm after the M=5.1 event is 204.
文摘We present an example of using converted-waves for characterizing onshore gas reservoirs in the Ordos basin in Northwest China. The Ordos basin is the largest gas province in China. The main gas reservoirs （about 3 300 m in depth） are in upper Paleozoic sandstone that has low or reversed P-wave impedance and is immediately above a coal seam. This makes it very difficult to image the gas reservoirs using conventional P-wave data. Analysis of core, log and VSP data shows a weak PP reflection but a relatively strong PS-converted wave reflection, or both strong PP- and PS-reflections but with opposite polarity from the gas bearing sands, which indicates the potential of using PS-waves to image the gas reservoirs in the Ordos basin. Subsequently, thirteen seismic lines were acquired, processed and interpreted to verify the PP- and PS-responses, and two corresponding attributes （PP- and PS- amplitude ratio and polarity ratio） are used to map the reservoirs through joint PP and PS analysis.
基金financially supported by the National Key R&D Program of China (No. 2019YFC0605503)the Major Scientific and Technological Projects of CNPC (No. ZD2019-183-003)the National Natural Science Foundation of China (No. 41922028,41874149)。
