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Using Hydro-Mechanical Simulation Models to Assess the Influences of Media Heterogeneity on Time-Lapse Seismic SignatureNormal access

Authors: Y. He, K. Fu, X. Wu, T. Wang and S. Wang
Event name: 80th EAGE Conference and Exhibition 2018
Session: Poster: 4D Analysis and Evaluation A
Publication date: 11 June 2018
DOI: 10.3997/2214-4609.201801288
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 336.05Kb )
Price: € 20

Summary:
Extraction of fluids from subsurface reservoirs induces changes in pore pressure, leading not only to geomechanical changes, but also perturbations in seismic velocities and hence observable seismic attributes. In this study, we integrate hydro-mechanical simulation results with rock physics models and full-waveform seismic modelling to assess time-lapse seismic attribute resolution for dynamic reservoir characterization. The time-lapse seismic simulations use a dynamic elastic reservoir model based on a deep reservoir undergoing large pressure changes. The time-lapse seismic travel-time shifts and time strains calculated from the modelled and processed synthetic data sets are in a reasonable agreement with the true earth models, indicating the feasibility of using one-dimensional strain rock physics transform and time-lapse seismic processing methodology. Estimated vertical travel-time shifts for the overburden and the majority of the reservoir are within ±1 ms of the true earth model values, indicating that the time-lapse technique is sufficiently accurate for predicting overburden velocity changes and hence geomechanical effects. The results from this study indicate that integrated seismic and hydro-mechanical modelling can help constrain time-lapse uncertainty and hence reduce risk due to fluid extraction and injection.


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