Simultaneous multiple well-seismic ties using flattened synthetic and real seismograms

Abstract

Well-seismic ties allow rock properties measured at well locations to be compared with seismic data and are therefore useful for seismic interpretation. Numerous methods have been proposed to compute well-seismic ties by correlating real seismograms with synthetic seismograms computed from velocity and density logs. However, most methods tie multiple wells to seismic data one by one; hence, they do not guarantee lateral consistency among multiple well ties. We therefore propose a method to simultaneously tie multiple wells to seismic data. In this method, we first flatten synthetic and corresponding real seismograms so that all seismic reflectors are horizontally aligned. By doing this, we turn multiple wellseismic tying into a 1D correlation problem. We then compute only vertically variant but laterally constant shifts to correlate these horizontally aligned (flattened) synthetic and real seismograms. This two-step correlation method maintains lateral consistency among multiple well ties by computing a laterally and vertically optimized correlation of all synthetic and real seismograms. We applied our method to a 3D real seismic image with multiple wells and obtained laterally consistent well-seismic ties.

3-D Structural geological models: Concepts, methods, and uncertainties

“…Similar methods have also been applied in stratigraphic settings to simulate the possible location of stratigraphic unconformities from sparse borehole data (Lallier et al, 2012(Lallier et al, , 2016Wu and Caumon, 2017;Edwards et al, 2018). As the location and number of gaps in the stratigraphic record vary, this amounts to changing the number of units and relationships between units in the stratigraphic column.…”

3D static reservoir modelling to evaluate petroleum potential of Goru C-Interval sands in Sawan Gas Field, Pakistan

“…Seismic sequence stratigraphy techniques aid in establishing the depositional setting of a particular formation for a basin while assisting the prediction of lithologies (Vail et al, 1987;Ahmed et al, 2004;Munir et al, 2011). Key lithologic horizons identified on seismic reflection data are correlated to well data either by generating synthetic seismograms, check shot surveys or by a vertical seismic profiling (Cubizolle et al, 2015;Ali and Farid, 2016;Wu and Caumon, 2017). Utilizing the results of studies from well data to predict and map reservoir properties over large areas can provide a guide for the reservoir modelling procedure (Ali et al, 2018(Ali et al, , 2019.…”