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Collaborating Authors
Results
4D Gravity Monitoring of Fluid Movement At Delhi Field, LA: A Feasibility Study With Seismic And Well Data
Krahenbuhl, Richard A. (Center for Gravity, Electrical & Magnetic Studies (CGEM), Colorado School of Mines) | Li, Yaoguo (Center for Gravity, Electrical & Magnetic Studies (CGEM), Colorado School of Mines) | Davis, Tom (Reservoir Characterization Project (RCP), Colorado School of Mines)
Summary In this paper, we present a multi-faceted feasibility study for monitoring fluid movement in a reservoir at various injection times using 4D micro-gravity method. Simulations are performed using a representation of the Delhi Field, LA, constructed by directly integrating seismic and well data. We then analyze anomaly amplitudes and inversion performance with respect to data noise. Results demonstrate a strong likelihood of imaging bulk fluid movement over the life of the project, as well as at early stages of CO2 injection into the thicker down-dip sequences within the reservoir. In contrast, there is a limited ability to recover fluid contact movement in the thinner up-dip regions of the reservoir.
- North America > United States > Louisiana (0.87)
- North America > United States > North Dakota > Golden Valley County (0.62)
- Geophysics > Seismic Surveying (1.00)
- Geophysics > Gravity Surveying > Gravity Acquisition (0.52)
- North America > United States > Louisiana > Delhi Field (0.99)
- Europe > Norway > North Sea > Central North Sea > South Viking Graben > PL 103 > Block 25/8 > Jotun Field > Ty Formation (0.99)
- Europe > Norway > North Sea > Central North Sea > South Viking Graben > PL 103 > Block 25/8 > Jotun Field > Tor Formation (0.99)
- (27 more...)
- Reservoir Description and Dynamics > Improved and Enhanced Recovery > Chemical flooding methods (0.71)
- Reservoir Description and Dynamics > Storage Reservoir Engineering > CO2 capture and sequestration (0.54)
- Reservoir Description and Dynamics > Formation Evaluation & Management > Open hole/cased hole log analysis (0.49)
- Reservoir Description and Dynamics > Reservoir Characterization > Seismic processing and interpretation (0.48)
Archaeological Investigations Using Geophysics At Chimney Rock Great House, Colorado
Mitchell, Michael A. (Department of Geophysics, Colorado School of Mines) | Devriese, Sarah G.R. (Department of Geophysics, Colorado School of Mines) | Frary, Roxanna N. (Department of Geophysics, Colorado School of Mines) | Krahenbuhl, Richard A. (Department of Geophysics, Colorado School of Mines) | Todd, Brenda K. (Department of Anthropology, University of Colorado)
SUMMARY In this talk, we present results from a geophysical investigation at the Chimney Rock Great House using magnetics, electromagnetics, and DC resistivity. Our data is focused on a grid southwest of the Great House, where we use geophysics to detect potential buried walls. These walls may be covered by 1 to 3 m of fill as a result of nearby excavations in the 1920s, and should be approximately 0.5 m thick. Using geophysics, we were able to identify several potential targets in the multiple datasets, which are consistent with sketches from earlier archaeological digs. Through our investigations, we have likewise gained a better understanding of the geophysical responses of buried walls at Chimney Rock. INTRODUCTION The Chimney Rock area, which can easily be recognized by the iconic shape of the towering sandstone formations, is located about twenty miles west of Pagosa Springs, CO. The area has at least seven Native American settlements but our prime interest is the Great House located at one of the highest points. Surrounded by cliffs on every side, the Great House offers protection and views of the entire valley. Much of the Great House has been excavated throughout the 20th century and a 1920s map of the settlement depicts the structure. However, some of the walls indicated in this map are not currently visible at the site (see Figure 1). Chimney Rock was inhabited by the ancestors of the modern Puebloan tribes during the late 11th century to the early 12th century. These ancestral Puebloans were characterized by their subsistence farming regimen, construction of dwellings, production of tools and crafts, use of storage rooms, and integration of cultural structures. This particular settlement is connected to the practice of astronomy. The two pinnacles, Chimney and Companion Rocks, were most likely used for the observation of lunar standstills. Once every 18.6 years, the moon is seen to rise directly between the two rocks (Richardson, 2006). In 2009, researchers at the University of Colorado at Boulder reduced fill in advance of stabilization and conducted limited tests to determine depth to the sandstone bedrock in two rooms of the Great House. The geology of the Chimney Rock area is part of a larger area called the Mesaverde Group (Chronic, 2001). The rock that composes Chimney Rock is a Cretaceous shoreline deposit, an artifact of the ancient sea that used to cover most of Colorado. The sedimentary cap at Chimney Rock is Pictured Cliffs Sandstone (about 70-100 million years old) while the dark gray sediments below are Lewis Shale (CRIA, 2009). When looking at the Chimney Rock area, it becomes clear that the sandstone, of which the two pinnacles are comprised, is more resistant to erosion than the underlying shale. Over time, these structures will also erode away. The Native American structures at Chimney Rock were built using local material. We will show that geophysics can be used to distinguish between the local rock used to build houses and the soil that fills and covers the structures.
- Geology > Rock Type > Sedimentary Rock > Clastic Rock > Sandstone (1.00)
- Geology > Rock Type > Sedimentary Rock > Clastic Rock > Mudrock > Shale (0.45)