Estimated pay mapping using three‐dimensional seismic data and incremental pay thickness modeling

Abstract

Better estimates of hydrocarbon pay thickness and reservoir distribution are achieved if forward modeling is combined with crossplot cluster analysis before the seismic amplitude and isochron data are converted into estimates of pay thickness. To facilitate this process, an enhanced convolutional modeling technique that incorporates petrophysical data and equations into the synthetic seismogram generation process was developed. These incremental pay thickness (IPT) forward models provide the pertinent seismic and petrophysical values required for crossplot analysis. The crossplot analyses then define which seismic variables (trough amplitude, peak amplitude, time structure, isochron, etc.) are most uniquely related to a pay thickness parameter (gross thickness, net thickness, net porosity thickness, or hydrocarbons in place). Work to date, mostly in offshore Gulf Coast gas sands, has shown significant variation in the crossplot transforms required to convert seismic data to estimated pay maps. As such, an interactive, model‐based, interpretive approach is recommended as an appropriate means to integrate petrophysical, geologic, and 3-D seismic data in the creation of reservoir pay maps.

Estimation of net-pay thickness, using seismic reflectivity and band-limited impedance approaches, Central Nile Delta, Egypt

“…Neff stated that the method of Brown is not accurate to apply for the real data, as it considered being an oversimplification on the basis of these types of results (Neff, D.B., 1990a(Neff, D.B., , 1990b(Neff, D.B., , and 1993. He also said that the relationship between trough-to-peak amplitudes, isochrones, and reservoir characteristics can be complex, as well as vary dramatically amongst geological contexts (Simm R., 2009).…”

Integrating The Geophysical Characterization Of Seismic Thin Beds With Stochastic Reservoir Modeling: A Case Study From The Kutei Basin (Offshore Kalimantan, Indonesia)

“…Direct calibration can only be applied to fully resolved, above tuning reservoir layers, commonly associated with thick single-loop events or by multiple reflections. Several approaches addressing the tuning effect in seismic reservoir characterization have been proposed and discussed by, among others, Brown et al (1984), Neff (1990aNeff ( , 1990b, Connolly (2007) and Simm (2009). In this case study, we describe the application of a technique proposed by Fervari and Luoni (2006) and already implemented in other similar settings and Amato et al, 2009).…”

Simple net pay estimation from seismic: a modelling study

“…On the basis of these types of results, Neff (1990aNeff ( , 1990bNeff ( , 1993 considered the amplitude scaling method of Brown et al (1984Brown et al ( , 1986 to be an oversimplification. He highlighted the fact that the relationships between trough-topeak amplitudes, isochrones, and reservoir parameters may not only be complex but also may vary significantly between different geological scenarios.…”