Uncertainty Analysis to Assess Depth Conversion Accuracy: A Case Study of Subba Oilfield, Southern Iraq

Abstract

The depth conversion process is a significant task in seismic interpretation to establish the link between the seismic data in the time domain and the drilled wells in the depth domain. To promote the exploration and development of the Subba oilfield, more accurate depth conversion is required. In this paper, three approaches of depth conversions: Models 1, 2, and 3 are applied from the simplest to the most complex on Nahr Umr Reservoir in Suba oilfield. This is to obtain the best approach, giving less mistakes with the actual depth at well locations and good inter/extrapolation between or away from well controls. The results of these approaches, together with the uncertainty analysis provide a reliable velocity model and more accurate predicted depth that reduced the ambiguity of the subsurface. The uncertainty analysis reveals that Model 3 is considered a more practical and most accurate approach because it gives a minimized standard deviation value of 14 with less residual and error values. The uncertainty of the depth conversion and the standard deviation values is raised towards the eastern part of the field due to an increase in the dipping depth in this region that affects the depth conversion results.

The Influence of Diagenesis Processes on the Reservoir Properties of Hartha Formation in Selected oil Fields, Northern Iraq

“…According to the type porosity in the Hartha reservoir (Table -1), core and thin section " primary and secondary porosity" type (Intercrystalline, Fracture, Interpartical, Vuggy, Cavern)، and quantity by density and netrune log (secondary porosity ), and primary porosity from sonic log [15]. Figures 5 and 6 shows porosity matching and permeability different in track (4 and 7) of wells A and C log and core sample correlated, as well as laboratory measured permeability by plug samples using steady state gas permeability technique [16].…”

Building 1D Mechanical Earth Model for Subba Oilfield in Iraq

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Acquisition and Preparation of 3D Seismic Data for Pre-Stack Inversion at Siba Oilfield, Southeastern Iraq

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