Wavefield Processing, Analysis, Imaging and Inversion with Application to Both Marine and Land Long-Offset Seismic Data - Ii

Project Details

Description

This proposal is organized to explore an unified approach through wavefield data analysis,processing, inversion and imaging for exploring both shallow and deep structure through the usage ofboth land and marine seismic data. We propose a full wavefield processing strategy approach. Theproposed methodology is a multi-purpose research plan by combining three major tasks through unifiedapproach for simultaneous source, propagation and crustal structure imaging. Data collection, assimilationand organization for both shallow sedimentation and deep structure imaging are the major efforts beingdone in the past. However, issues including promoting and demonstrating research capability for variousscientific targets are obviously more important for the next generation of active/passive seismology researchin Taiwan. Drawing good science and publish findings from existing seismic dataset become important forthe next decade. Fundamental issues including wavefield data pre-processing and pre-conditioningfollow by depth migration and inversion are naturally included in the proposed approach. Two typesof field data resources: (1) wide-angle multi-channel land and marine seismic data collected from bothTAICRUST (1991-1995) and TAIGER (2006-2008) international projects and NEP domestic master and (2)broadband teleseismic and short period velocity waveform data from both BATS/TSMIP will be used forvarious research purposes. Current data resources are mainly from exploration data.The objectives of the proposal tentatively try to cover theoretical studies and algorithm developments:(1) Focus on 2D problem but will extend to 3-D. Theoretical and coding development, test and evaluationof various wave propagation simulators. (2) Enhance the strength of computational seismology for betterunderstanding of more realistic wave propagation phenomena. (3) Demanding hardware facility and parallelcomputing algorithms are needed for development efforts and practical applications. (4) FWI is used inconjunction with travel-time inversion for setting up velocity reference models. Practical applications are:(1) perform pre-stack imaging for both wide-angle land and MCS/OBS marine seismic data; (2) investigatethe effects of attenuation as the function of distance, depth, frequency, scattering and AVO/AVA effects andthe feasibility of reverse-time wave propagation, migration and inversion; (3) explore the spatial andtemporal distribution of an earthquake source and the three-dimensional heterogeneous earth structure. (4)investigate source, path and site responses including topography effects; amplification due to effects ofshallow soil/sedimentary layers, basin shape, lateral velocity variation, Q distribution and/or others; (5)simulate earthquake source mechanism and rupture process when large earthquake occurred under or in theimmediate vicinity of Taiwan Island. Previous effort in receiver function studies to explore 3D Conrad andMoho geometries beneath Taiwan Island has been done. Items #1-3 are being pursuit in the last few years.Accurate seismic modeling, both in time- and frequency domain computations of acoustic, elastic,viscoacoustic/viscoelastic, anisotropic (VTI/HTI/TTI) and porous media responses will be developed, testedand evaluated for different applications. Current 3D spatial distribution of P-, S-velocity will be studied,modified, and evaluated accordingly. For field data study, we will utilize both short-offset/long-offset activesource data. Wide-angle seismic data will potentially from the study of ocean-bottom seismograph andmulti-channel marine seismic data from TAICRUST/TAIGER/NEP experiments. The results fromapplications covering wavefield processing, simulation and inversion will be published in the internationaljournal. Broadband and short period records are also widely available through TSMIP and broadband datamanagement system (DMS) since 1990. The main computation kernel for Wave propagation will ut
StatusFinished
Effective start/end date1/08/1731/07/18

UN Sustainable Development Goals

In 2015, UN member states agreed to 17 global Sustainable Development Goals (SDGs) to end poverty, protect the planet and ensure prosperity for all. This project contributes towards the following SDG(s):

  • SDG 11 - Sustainable Cities and Communities
  • SDG 14 - Life Below Water
  • SDG 17 - Partnerships for the Goals

Keywords

  • Modeling
  • Complex Crustal Structure
  • 2D
  • 3D
  • Structure Imaging
  • FWI

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