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Collaborating Authors
Results
Flow-limited Diagenesis And Transport Properties of Porous Media Using the Lattice-Boltzmann Method
Keehm, Youngseuk (Rock Physics Laboratory, Geophysics Department, Stanford University) | Mukerji, Tapan (Rock Physics Laboratory, Geophysics Department, Stanford University) | Nur, Amos (Rock Physics Laboratory, Geophysics Department, Stanford University)
Summary In this paper we present a model to simulate flow-limited digenetic processes in porous media. The model combines the Lattice-Boltzmann flow simulation with pore filling mechanisms. Eight different pore filling mechanisms related to the fluid flow were tested and the transport properties (permeability and electric conductivity) were calculated during the evolution of pore geometry. After investigating the transport properties in each mechanism, we identified four distinct groups: 1) grain boundary related, 2) low-flux related, 3) high-flux related and 4) random filling mechanisms. The boundary related mechanism showed very good correlation with empirical relations (Kozeny-Carmen relation and Archie’s law). Since the empirical relations represent averaged relations of real data and theoretical models, the grain boundary can be regarded as a major factor in the digenetic process of sedimentary rocks. Low-flux related mechanisms showed very small change in permeability even in latter stages of digenetic processes.
- Geology > Sedimentary Geology (0.73)
- Geology > Rock Type > Sedimentary Rock (0.37)
Summary La Cira-Infantas oil field is characterized by a series of structural heterogeneities associated with early and late Tertiary tectonic events. An intensely folded, faulted, and eroded Cretaceous sequence underlies the Tertiary cover below the Eocene unconformity. The west flank of a large antiform, elongated in north-south direction, is highly fractured by thrust faults that generate a series of asymmetric secondary folds. Late Tertiary structural heterogeneities comprise La Cira and Infantas anticlines and two groups of associated faults. The first group includes a set of low-angle reverse faults with east- and west-vergence. Moreover, there are a number of important normal faults, which compartmentalize La Cira and Infantas anticlines into a set of reservoir blocks.
- Phanerozoic > Cenozoic > Quaternary (0.93)
- Phanerozoic > Cenozoic > Paleogene > Eocene (0.38)
- Geology > Structural Geology > Tectonics > Compressional Tectonics > Fold and Thrust Belt (0.83)
- Geology > Structural Geology > Fault > Dip-Slip Fault > Reverse Fault > Thrust Fault (0.37)
- South America > Colombia > Tolima Department > Middle Magdalena Basin > Casabe Field (0.99)
- South America > Colombia > Santander Department > Middle Magdalena Basin > La Cira Infantas Field (0.99)
- South America > Colombia > Santander Department > Middle Magdalena Basin > Casabe Field (0.99)
- (7 more...)
In-situ Hydrocarbon Identification And Reservoir Monitoring Using Sonic Logs, La Cira-Infantas Oil Field (Colombia).
Gutierrez, Mario A. (Rock Physics Laboratory, Geophysics Department, Stanford University.) | Dvorkin, Jack (Rock Physics Laboratory, Geophysics Department, Stanford University.) | Nur, Amos (Rock Physics Laboratory, Geophysics Department, Stanford University.)
Summary This paper presents a rock physics model for identifying the quality of rock and pore fluid in a cased hole from dipole sonic data, as well as for monitoring temporal changes in the reservoir from repeated compressional-wave data in the well. By analyzing the Vp/Vs ratio from multi-pole velocity logs in a tertiary fluvial reservoir in La Cira oil field, we differentiated between nonhydrocarbon- and hydrocarbonbearing sands. Comparison of open (1988), cased-hole (1995) compressional sonic logs and production history confirmed these results. This comparison shows a drop in compressional velocity, which corresponds to the producing intervals where gas might have come out of solution.
- Geology > Rock Type > Sedimentary Rock > Clastic Rock (0.99)
- Geology > Geological Subdiscipline (0.92)
- Geology > Sedimentary Geology > Depositional Environment > Continental Environment > Fluvial Environment (0.36)
- Geophysics > Seismic Surveying (1.00)
- Geophysics > Borehole Geophysics (1.00)
- South America > Colombia > Tolima Department > Middle Magdalena Basin > La Luna Shale Formation (0.99)
- South America > Colombia > Tolima Department > Middle Magdalena Basin > Casabe Field (0.99)
- South America > Colombia > Santander Department > Middle Magdalena Basin > La Luna Shale Formation (0.99)
- (12 more...)
Rock-physics Characterization of a Tertiary Fluvial Reservoir, La Cira-Infantas Oil Field (Colombia).
Gutierrez, Mario A. (Rock Physics Laboratory, Geophysics Department, Stanford University.) | Dvorkin, Jack (Rock Physics Laboratory, Geophysics Department, Stanford University.) | Nur, Amos (Rock Physics Laboratory, Geophysics Department, Stanford University.)
Summary Rock-physics analysis and modeling of a Tertiary fluvial reservoir in La Cira-Infantas oil field shows that velocity and acoustic impedance are reliable reservoir quality discriminators. High velocity and acoustic impedance correspond to shales while low velocity and acoustic impedance indicate high-quality sandstone reservoirs. Rock-physics-and-stratigraphy-based interpretation of P-wave seismic data appears to be a promising approach for the detection of depleted, bypassed and untapped reservoirs and deeper pools in mature fields such as La Cira-Infantas. Introduction La Cira-Infantas (LCI) was the first oil field discovered in Colombia (1918) and remained the largest until the discoveries of Caño Limon in 1984 and Cusiana in 1992. The estimated original oil in place is 3,700 million barrels (MMBO).
- Geology > Geological Subdiscipline (1.00)
- Geology > Sedimentary Geology > Depositional Environment > Continental Environment > Fluvial Environment (0.88)
- Geology > Rock Type > Sedimentary Rock > Clastic Rock > Sandstone (0.70)
- South America > Colombia > Tolima Department > Middle Magdalena Basin > La Luna Shale Formation (0.99)
- South America > Colombia > Santander Department > Middle Magdalena Basin > La Luna Shale Formation (0.99)
- South America > Colombia > Santander Department > Middle Magdalena Basin > La Cira Infantas Field (0.99)
- (6 more...)