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Results
ABSTRACT Nuclear measurements in high-angle wells, such as density, neutron, and sigma logs, are often affected by shoulder bed effects and should not be processed directly by the methods which are typically used in vertical wells. Those measurements also have their own unique features and different depth of investigations because of the distinguishing physical principles. It is difficult to have a common formation model that reconstructs the tool responses for all the measurements. In order to remove the geometrical effects and build a consistent formation model among density, neutron, and sigma measurements, we developed a model-based inversion for multiple nuclear measurements in high-angle wells. The inversion algorithm has been validated using synthetic data and applied to field data set. Compared to the input measurements, the inversion results show consistent models, and provide more accurate layer petrophysical properties. Presentation Date: Thursday, October 20, 2016 Start Time: 8:55:00 AM Location: 168 Presentation Type: ORAL
ABSTRACT Crossbedding can cause significant effect on triaxial induction measurements. Previously we investigated the effect of crossbedding in detail for low angle and vertical wells with a new layered forward model incorporating crossbedding. In this paper, we extend the crossbedding forward model to high angle and horizontal wells. This is achieved by using the continued fraction to tackle the oscillating and oftentimes slowly convergent integrand. Moreover, we demonstrate with numerical experiments that crossbedding can have the same strong effect on triaxial induction measurements as in vertical and low angle wells. The numerical results show that the classical layered model assuming transverse isotropy is not adequate in the presence of strong crossbedding in high angle and horizontal wells. A new layered crossbedding forward model turns out to be a more appropriate choice in such scenarios. Presentation Date: Wednesday, October 19, 2016 Start Time: 2:45:00 PM Location: 168 Presentation Type: ORAL
- Oceania > Australia > Western Australia > North West Shelf > Carnarvon Basin > Barrow Basin > Gipsy/Rose/Lee Field > Lee Field > Mungaroo Formation > Mungaroo Formation > Mungaroo B Formation (0.93)
- Oceania > Australia > Western Australia > North West Shelf > Carnarvon Basin > Barrow Basin > Gipsy/Rose/Lee Field > Lee Field > Mungaroo Formation > Mungaroo A Formation > Mungaroo B Formation (0.93)
- Oceania > Australia > Western Australia > North West Shelf > Carnarvon Basin > Barrow Basin > Gipsy/Rose/Lee Field > Lee Field > Flag Formation > Mungaroo Formation > Mungaroo B Formation (0.93)
- Oceania > Australia > Western Australia > North West Shelf > Carnarvon Basin > Barrow Basin > Gipsy/Rose/Lee Field > Lee Field > Flag Formation > Mungaroo A Formation > Mungaroo B Formation (0.93)
- Well Drilling > Well Planning > Trajectory design (1.00)
- Reservoir Description and Dynamics > Reservoir Characterization (1.00)
- Reservoir Description and Dynamics > Formation Evaluation & Management > Open hole/cased hole log analysis (0.94)
- Well Drilling > Drilling Operations > Directional drilling (0.83)