SPWLA Monthly Luncheon Meeting

Thursday – September 20, 2018

PanAm Building- Suite 1600

601 Poydras St, New Orleans, LA 70130

11:30 – 1:00 pm


or email Elizabeth Tanis (Elizabeth.Tanis@shell.com) with RSVP


 Towards 3D Reservoir Mapping Using Deep Directional Resistivity

Presented By: Dzevat Omeragic
Scientific Advisor, Schlumberger


Since its introduction more than a decade ago, the deep directional resistivity technology for proactive geosteering had revolutionized well placement efficiency, maximizing the reservoir contact, with direct impact on cost and recovery. We will overview the status of the measurement and related interpretation technology, including recent progress towards the 3D reservoir mapping.

Currently the real-time interpretation of deep directional resistivity measurements is based on continuous inversion for a locally 1D layered resistivity profile, generating an approximate 2D resistivity map along the well path. The novel model-driven inversion methodology provides a high-definition reservoir map suited for narrow strata delineation and early reservoir detection to be used in well placement operation. By integrating the prior field geology knowledge and information from offset wells as reference patterns, the algorithm is able to consistently and accurately map finer features of the layered formations further away from the wellbore, resulting in an enhanced and expedited real-time steering decision-making process. A field example illustrate how interpretation helped to better understand the well production behavior

All practical inversion approaches so far were ignoring the information on lateral changes of the reservoir, only providing a longitudinal 2D snapshot of the 3D reservoir structure around the well. The newly developed deep pixel-based 2D azimuthal imaging inversion is able to map lateral reservoir heterogeneities. It takes advantage of full 3D sensitivities of deep directional resistivity measurements. When applied in real-time while drilling, it has potential to significantly reduce drilling hazards as it will enable true 3D steering towards or away from lateral targets. Imaging was applied to consistent imaging of faults on a side of the wellbore, when approaching, crossing and moving away from the fault.

 We also present an innovative integration methodology to build a realistic, high resolution geomodel reconciling all the subsurface measurements made at different scales, including real time LWD measurements, 1D and 2D resistivity inversions, interpreted dips and time lapse seismic data. The measurement integration significantly improves the understanding of the 3D reservoir structure and fluids distribution, benefiting the planning and drilling of horizontal wells, especially to optimize geosteering for productivity of infill wells in the complex settings of mature fields.



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United States
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