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【資環論壇81期預告】—各向異性彈性逆時偏移與4維地震監測的虛擬源技術

來源:研管科編輯:任書穎閱讀次數:412日期:2019-05-22

資環論壇81期特別邀請國家特聘青年專家趙楊博士主講,歡迎廣大師生參加,具體安排如下:


報告題目:各向異性彈性逆時偏移與4維地震監測的虛擬源技術

報告人:趙楊博士

時間:2019524日(周五)上午10:00

地點:創新中心D518


報告摘要:


1.Anisotropic elastic reverse time migration

Separating compressional and shear wavefields is an important step in elastic reverse-time migration, which can remove wave-mode crosstalk artifacts and improve imaging quality. In vertical (VTI) and titled (TTI) transversely isotropic media, the state-of-art techniques for wavefield separation are based on either non-stationary filter or low-rank approximation. They both require intensive Fourier transforms for models with strong heterogeneity. Based on the eigenform analysis, we develop an efficient pseudo-Helmholtz decomposition method for VTI and TTI media, which produces vector P- and S-wavefields with the same amplitudes, phases and physical units as the input elastic wavefields. The separated vector wavefields are used to produce PP and PS images by applying a dot-product imaging condition. Several numerical examples demonstrate the feasibility and applicability of the proposed methods.


2.Virtual source for 4D land monitoring

Interferometric virtual source (VS) redatuming converts surface-triggered source records into the equivalent records as if they originated from buried receiver locations by crosscorrelating downgoing waves with the corresponding upgoing waves. However, in the presence of a complex near surface, an intricate shallow structure and highly variable weathering layers can severely distort the raypath, such that it produces uneven angle coverage to the buried VS. We address these issues explicitly by spatially filtering the potentially contaminated direct wavefields using a zero-phase matched filter, such that the filtered wavefield is consistent with a model-based ideal direct P-wavefield observed at common receiver locations. The new VS approach provides significantly improved image quality and repeatability based on a pilot field of 13 time-lapse surveys, which solved a significant repeatability problem across a 17 month survey gap.


報告人簡介:


趙楊博士,2006年北京大學本科畢業北京赛车pk10计划,2013年初獲美國加州大學伯克利分校博士學位北京赛车pk10计划。2018年入選國家特聘青年專家。曾先后在斯倫貝謝,殼牌北京赛车pk10计划,道達爾和康菲石油進行研究工作北京赛车pk10计划,現就職于沙特阿美國家石油公司休斯頓研發中心,任資深地球物理勘探師,擁有7年在美國石油公司的工業界經驗。發表與接收國際會議和期刊論文30余篇,申請美國專利6個。主要研究方向為:地震干涉,四維地震處理,聲波與彈性波逆時偏移成像北京赛车pk10计划。




                                                                                                           資源與環境學院   信息地學研究中心

                                                                                                                     2019年5月22日

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