oa Emerging Stratigraphic Play Opportunities of the Jurassic of Saudi Arabia through from Enhanced Workflow

The search for stratigraphic traps especially in carbonates is a challenging task and requires careful<br>detailed analysis of the petroleum system elements. Understanding the spatial relation between<br>source, reservoir and seal layers constitutes a critical success factor. Building a workflow that<br>transforms well and seismic data into 3D models allows stratigraphic traps prediction and better<br>understanding of the stratigraphic trapping components.<br>With the acquisition of modern 3D seismic data and the advancement in data analysis software, we are<br>able to build 3D seismic and electrofacies and porosity models that are tied to well based information<br>such as cores and well logs. The built 3D models allow the investigation of the spatial relations of<br>source, reservoir and seal units.<br>A corner stone of our workflow for targeting carbonate stratigraphic traps is to integrate all available<br>data into 3D models of seismic facies, electrofacies and core data. These models were also transformed<br>to porosity models using relations from seismic (AI), core measured and well log derived porosities.<br>This allows analysis of the stratigraphic trap in great details. Highly detailed core data and well log<br>defined electrofacies, are upscaled and used to calibrate seismic waveform based facies. The seismic<br>facies volume generated from a combination of seismic attributes allowed lateral stratigraphic<br>prediction.<br>A workflow for the deliberate search for carbonate stratigraphic traps includes:<br>● Stratigraphic and sedimentologic analysis from cores and well-logs and building of depositional<br>architecture.<br>● Stratigraphic modeling and Wheeler diagram construction to track lateral and temporal shifts of<br>depositional facies and electrofacies modeling, which uses a combined analysis of well logs and cores,<br>for facies definition.<br>● Seismic modeling and analysis to investigate the link of the facies response to seismic.<br>● Hybrid clustering classification.<br>● Seismic trace based 3D model integration of the core lithofacies, the electrofacies, and the seismic<br>facies to produce facies and porosity models.<br>● Integration of other petroleum systems elements and visualization of the results.<br>Application of this workflow to a Jurassic interval in an area in the eastern Saudi Arabia have proven<br>that carbonate stratigraphic trap can be predicted thus giving us confidence in pursuing these type of traps.