Carbonate-anhydrite facies determination by quantitative seismic stratigraphy in paradox basin

Conference · Fri Feb 01 04:00:00 EST 1985 · Am. Assoc. Pet. Geol., Bull.; (United States)

OSTI ID:5720464

Wadleigh, Jr, R F; Ward, J A

Recent advances in seismic acquisition and processing techniques have greatly improved the usable bandwidth and signal-to-noise ratio of seismic data collected in the Paradox basin. Historically, irregular terrain coupled with shallow velocity gradients limited the usable stratigraphic thin-bed resolution to near 60 Hz. Analysis of filtered sonic logs of the upper Ismay formation suggests that even with 100-Hz seismic data, carbonate porosity will not be represented seismically as an individual low-velocity trough on wavelet-processed data. Conventional seismic stratigraphy attempted to interpret these zones based on a qualitative study of synthetic seismograms. The purpose of this paper is to evaluate an inverse method of calibrating seismic data by the integration of quantitative analysis of filteral sonic logs from bore-hole data with seismically derived sonic logs (Seislogs). The Seislog display has a horizontal scale in transit time and a vertical scale in depth. In this format it is possible to compare quantitative variations observed on the Seislogs with changes derived in model studies that relate filtered velocity on sonics to lithologic variation. This paper discusses the application of this method in an upper Ismay field (Patterson Canyon), located in San Juan County, Utah. The field is currently producing oil from a porous carbonate algal-mound facies which filtered-sonic logs is typified by a decrease in both velocity and thickness when compared to the anhydrite facies. When the carbonate facies becomes tight, there is a transit-time decrease and an apparent increase in thickness. The anhydrite facies sonically has the lowest transit time and also is the thickest facies. It is important to note that a limestone with intercalated clastics may have exactly the same sonic response as the porous carbonate facies.

• Research Organization: Teknica Inc., Houston, TX
• OSTI ID: 5720464
• Report Number(s): CONF-850322-
• Conference Information: Journal Name: Am. Assoc. Pet. Geol., Bull.; (United States) Journal Volume: 69:2
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020200* -- Petroleum-- Reserves
Geology
& Exploration
ALKALINE EARTH METAL COMPOUNDS
ANHYDRITE
CALCIUM COMPOUNDS
CALCIUM SULFATES
CARBONATE ROCKS
GEOLOGIC DEPOSITS
GEOLOGY
GEOPHYSICAL SURVEYS
MINERAL RESOURCES
MINERALS
OXYGEN COMPOUNDS
PETROLEUM DEPOSITS
RESERVOIR ROCK
RESOURCES
ROCKS
SEDIMENTARY ROCKS
SEISMIC SURVEYS
STRATIGRAPHY
SULFATE MINERALS
SULFATES
SULFUR COMPOUNDS
SURVEYS