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Microseismic Full Waveform Modeling And Location Uncertainty In Anisotropic MediaNormal access

Author: P. Shi
Event name: Seventh EAGE Workshop on Passive Seismic 2018
Session: PSW Poster Session 1
Publication date: 26 March 2017
DOI: 10.3997/2214-4609.201800048
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 2.04Mb )
Price: € 20

Summary:
Full waveform modeling is a powerful tool to understand elastic wave phenomena in complex media and is widely used in exploration geophysics. Among many full waveform modeling methods, the finite-difference method is widely used. This study is focused on developing an efficient finite-difference forward modeling tool, which is suitable for modeling wave propagation in anisotropic media for microseismic monitoring. As both dislocation and non-double-couple source are observed in microseismic monitoring, an arbitrary moment tensor source is implemented in the forward modeling tool. We equally distribute the increments of shear stress on the staggered-grid to obtain an accurate and symmetric moment tensor source. Our modeling tool provides an efficient way to obtain the Green's function of basic moment tensor component in anisotropic media, which is the key of moment tensor inversion and source mechanism characterization in microseismic monitoring. Seismic anisotropy will make the recorded wavefield much more complex, thus making microseismic imaging difficult. In our research, wavefields in anisotropic media have been carefully simulated and analysed for further contributing to microseismic monitoring. Analysing the travel-time and amplitude of the recorded waveforms provides a feasible way to estimate the anisotropy of subsurface, and thus improve the quality of microseismic imaging.


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