Incorporating_Geophysics_into_Geologic_Models

Incorporating_Geophysics_into_Geologic_Models - Most oil...

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Unformatted text preview: Most oil and gas exploration and pro- duction companies have a substantial investment in seismic data and inter- pretation of that data. This data con- tains a wealth of information about the reservoir properties between the well locations, and this information would be of great interest to geologic model- ers if only it were available in a form they could make use of in their geologic models. GETTING SPATIAL INFORMATION FROM SEISMIC Geologic models are built from well data, making the model very detailed and reliable at each well location. But what is going on between the wells? A basic step is to connect the stratigra- phy from well to well, but this does not account for faults or other anomalies. Seismic data is an obvious source for inter-well surface data, but for reservoir property information it is inherently incompatible in its measuring system— time instead of depth and samples instead of grid cells and layers. Convert- ing these two systems into a compat- ible grid has been a serious challenge for many years. THE SEISMIC CONTRIBUTION Well data and seismic data are in a way quite opposite. Well data is very detailed in a small area. Seismic data covers a large area but is much less detailed. Well data gives rich detail in specific locations but the rest of the field remains relatively unknown at that level of detail. Seismic data provides a coarse view of everything, but sharp focus is not possible with seismic alone. An interesting change occurs when well data and seismic are combined. Seismic sheds light on the unknowns between wells, while well data helps sharpen detail. Overall, a model combining well and seismic data thus becomes more useful to geologists, geophysicists and engineers alike. The only question re- maining is how to put the two together. PROBLEMS COMBINING SEISMIC AND WELL DATA Sometimes seismic is used as a back- drop to well data in cross-section view. This provides a bit of context to the well analysis but contributes nothing quantitative. The geologist may believe the formation will behave in a certain way because of what he sees, but there is little hard data to back up that belief....
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This note was uploaded on 08/06/2011 for the course PGE 202 taught by Professor Luth during the Spring '11 term at UPR Ponce.

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Incorporating_Geophysics_into_Geologic_Models - Most oil...

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