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Title: Three-demensional seismic modeling and seismic facies imaging

Abstract

A set of 3-D rock-property models were generated for a lower Miocene shorezone system at Powderhorn field, Calhoun County, Texas. These models were based on detailed mapping of facies and rock-properties that involved 250 m of stratigraphic section over an area of 9 by 13 km. Examination of logs from 115 wells showed that fourteen sandy depositional units averaging 3-30 m in thickness were encased in 15 shale units. Effective porosity, P-wave velocity and bulk density were calculated from suites of wireline logs from five recent wells, and then expanded to older wells through regression with SP and resistivity logs. Idealized 3-D seismic models were generated by convolving a Ricker wavelet with the primary reflection coefficient series from stacked 2-D P-wave velocity and impedance models. The analysis to these models revealed the potential and limitations of seismic facies imaging for a clastic depositional sequence. Our models show that peak picking often distorts reservoir facies images. In some cases, seismic events from sand bodies in different units may interfere, forming a new event. An event typing as many as six depositional units over 50 m has been observed. Phantom mapping between reference events produces truer stratal slices, and makes it possiblemore » to map detailed depositional history from 3-D seismic data. Stratal slices from real 3-D seismic volumes in Gulf Coast Tertiary demonstrate that sequential, fairly high-resolution amplitude images of various depositional facies can be obtained from lower frequency seismic data. Depositional facies patterns on those stratal slices provide much desired high-frequency information that may not otherwise be recognized on vertical seismic sections.« less

Authors:
 [1]; ;  [2]
  1. Texaco Inc., New Orleans, LA (United States)
  2. Univ. of Texas, Austin, TX (United States)
Publication Date:
OSTI Identifier:
150583
Report Number(s):
CONF-9510222-
Journal ID: AABUD2; ISSN 0149-1423; TRN: 95:007541-0056
Resource Type:
Journal Article
Journal Name:
AAPG Bulletin
Additional Journal Information:
Journal Volume: 79; Journal Issue: 10; Conference: American Association of Petroleum Geologists (AAGS) Gulf Coast Section meeting, Baton Rouge, LA (United States), 25-27 Oct 1995; Other Information: PBD: Oct 1995
Country of Publication:
United States
Language:
English
Subject:
02 PETROLEUM; 58 GEOSCIENCES; GEOLOGIC STRUCTURES; SEISMIC DETECTION; MAPPING; TEXAS; SEISMIC SURVEYS; STRATIGRAPHY; GEOLOGIC MODELS

Citation Formats

Zeng, H, Tyler, N, and Backus, M M. Three-demensional seismic modeling and seismic facies imaging. United States: N. p., 1995. Web.
Zeng, H, Tyler, N, & Backus, M M. Three-demensional seismic modeling and seismic facies imaging. United States.
Zeng, H, Tyler, N, and Backus, M M. Sun . "Three-demensional seismic modeling and seismic facies imaging". United States.
@article{osti_150583,
title = {Three-demensional seismic modeling and seismic facies imaging},
author = {Zeng, H and Tyler, N and Backus, M M},
abstractNote = {A set of 3-D rock-property models were generated for a lower Miocene shorezone system at Powderhorn field, Calhoun County, Texas. These models were based on detailed mapping of facies and rock-properties that involved 250 m of stratigraphic section over an area of 9 by 13 km. Examination of logs from 115 wells showed that fourteen sandy depositional units averaging 3-30 m in thickness were encased in 15 shale units. Effective porosity, P-wave velocity and bulk density were calculated from suites of wireline logs from five recent wells, and then expanded to older wells through regression with SP and resistivity logs. Idealized 3-D seismic models were generated by convolving a Ricker wavelet with the primary reflection coefficient series from stacked 2-D P-wave velocity and impedance models. The analysis to these models revealed the potential and limitations of seismic facies imaging for a clastic depositional sequence. Our models show that peak picking often distorts reservoir facies images. In some cases, seismic events from sand bodies in different units may interfere, forming a new event. An event typing as many as six depositional units over 50 m has been observed. Phantom mapping between reference events produces truer stratal slices, and makes it possible to map detailed depositional history from 3-D seismic data. Stratal slices from real 3-D seismic volumes in Gulf Coast Tertiary demonstrate that sequential, fairly high-resolution amplitude images of various depositional facies can be obtained from lower frequency seismic data. Depositional facies patterns on those stratal slices provide much desired high-frequency information that may not otherwise be recognized on vertical seismic sections.},
doi = {},
journal = {AAPG Bulletin},
number = 10,
volume = 79,
place = {United States},
year = {1995},
month = {10}
}