Computer assisted log analysis of Pennsylvanian Canyon sands Iron County, Texas using interactive petrophysical software

Conference · Mon Feb 01 04:00:00 EST 1993 · Geological Society of America, Abstracts with Programs; (United States)

OSTI ID:6060699

Asquith, G B; Thomerson, M D ^[1]

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1. Texas Tech Univ, Lubbock, TX (United States). Geosciences Dept. and the Center for Applied Petrophysical Studies

Iron County, Texas is located along the Eastern Shelf of the Midland basin. The Pennsylvanian Canyon sands in this area were deposited as a sequence of deep water slope sands interbedded with basinal shales. Authigenic illite-smectite clays are often present and lower resistivity masking the productive potential of the Canyon sands. During drilling of the example well gas kicks were noted over an interval from 5,860 feet to 6,000 feet, however, samples shown were poor. The well logs indicated nine low resistivity sands over the 5,860 to 6,000 foot interval. Due to the poor shows and the low resistivity of the sands the well was plugged. Computer assisted log analysis was used determine: (1) the formation water resistivity (RW), (2) the volume of clay (Vcl), (3) the clay distribution, (4) if permeable reservoirs are present, and (5) to distinguish hydrocarbon from water productive zones. They type of clay distribution (dispersed) was determined by Vcl (sp) versus Vcl (gr) and Dual water versus Fertl Shaly Sand crossplots. The presence of permeable reservoirs was determined by a shaly sand producibility plot (Q-plot). Hydrocarbon versus water productive zones were differentiated by a series of crossplots. The verification of the gas shows by log analysis indicates a potential productive series of Canyon sands up dip to the east of the example well.

• OSTI ID: 6060699
• Report Number(s): CONF-9303212--
• Conference Information: Journal Name: Geological Society of America, Abstracts with Programs; (United States) Journal Volume: 25:1
• Country of Publication: United States
• Language: English

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03 NATURAL GAS
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58 GEOSCIENCES
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CARBONIFEROUS PERIOD
CLAYS
COMPUTER CALCULATIONS
COMPUTER GRAPHICS
DATA ANALYSIS
DEVELOPED COUNTRIES
ELECTRIC LOGGING
GEOLOGIC AGES
GEOLOGIC DEPOSITS
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PERMEABILITY
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RESERVOIR ROCK
RESISTIVITY LOGGING
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WELL LOGGING