1st Research Conference - Gulf Coast Section SEPM

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Core analysis and thin-section examination shows that the maximum amount of porosity occurs in the muddy, bioturbated facies and is diagenetic; very little porosity occurs in the clean sand facies, which is cemented by quartz overgrowths. The sequence of diagenetic events appears to be (1) development of poikilotopic calcite cement, (2) dissolution of less stable components such as feldspar, volcanoclastics, and calcite cement, and (3) development of quartz overgrowths. Dissolution occurred probably as fresher water entered the sandstones during the development of the base of Austin unconformity, when Kurten was uplifted to the south, and the "A," "B," and "C" sand units were truncated The result is a more porous and permeable reservoir on the south end of the field which becomes progressively less permeable northward. The north limit of the field is defined by a combination of facies change and permeability occlusion due to the lack of secondary porosity, making Kurten Field a diagenetic as well as stratigraphic trap.
Seismic Stratigraphy of Seven Oaks Field, Polk County, Texas Ward, J.A., Teknica, Inc., Houston, TX (p. 37) Seven Oaks Field in Polk County, Texas produces from Woodbine sandstones at depths of 12,000 to 12,500 ft having 10 to 100 ft of net pay. Approximately 10 mi of geophysical data were processed by Teknica Inc. for a Seislog format to determine whether the trap could be mapped seismically. Explorationists are able to define general areas of Woodbine truncation on conventional seismic sections, although recognition of the precise subcrop edge of producing sandstones has not been possible. Geologic horizons can be identified by converting each seismic trace to an impedance log and using well data for calibration. In this manner, composite high velocity units interpreted as Woodbine sandstones can be mapped seismically. The Seislog section illustrates geologically angular discordance between the Woodbine and overlying Austin Chalk. Definition of the Woodbine subcrop updip from the Highland Resources No. 1 well provides excellent delineation of the producing sandstones. Genetic relationship of the Woodbine edge with underlying Edwards-Buda reefing is clear also because Woodbine truncation conforms closely with steep dips in the underlying Buda. South of the field, Seislog units show stratigraphy that could be interpreted as Woodbine truncation similar to that of the producing region. Alternatively, this feature could be interpreted as a pinch out of a basal Navarro limestone.
Page 2 and 3: Cover Photographs Scanning electron
Page 4 and 5: GULF COAST SECTION SOCIETY OF ECONO
Page 6 and 7: BACK TO THE FUTURE: A NOTE FROM THE
Page 10 and 11: The Deep Tuscaloosa Gas Trend of So
Page 12 and 13: Park formations indicate that the s
Page 15 and 16: Fluid System Compositions: Drilling
Page 17 and 18: Depositional Environment of Woodbin
Page 19 and 20: Origin of Porosity in Deeply Buried
Page 21 and 22: The East Texas Field Halbouty, M.T.
Page 23 and 24: No. 1 Play in the U.S.A., South Lou
Page 25 and 26: sedimentary rock characteristics, i
Page 27 and 28: Local highs on aeroradioactivity ma
Page 29 and 30: Secondary Porosity in the "19,800 F
Page 31 and 32: Sedimentology of the "19,800 Foot"
Page 33 and 34: Preservation of Porosity in the Dee
Page 35 and 36: 21,194.5 - 95 0.9 14.4 20.2 29.9 21
Page 37: Environment of Deposition and Reser

1st Research Conference - Gulf Coast Section SEPM

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