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Title: 2-D synthetic seismic and log cross sections from stratigraphic forward models

Abstract

In an effort to fully utilize deterministic stratigraphic forward modeling techniques in subsurface stratigraphic analysis, Shell has developed a computer interface to routinely create synthetic logs and one-dimensional and two-dimensional (2-D) seismic responses from 2-D stratigraphic simulations. Each 2-D stratigraphic model can contain up to 200 timelines defining age equivalent stratigraphic layers with laterally variable lithofacies and depths. Synthetic gamma-ray, density, and velocity responses are calculated for the simulated lithofacies using user-specified rock and fluid properties. Vertically incident synthetic seismograms are created using calculated reflection coefficients and user-defined input wavelets. Because the chronostratigraphy is know a priori, log correlations and the interpolated seismic geometries follow timelines exactly. The power of this technique as an aid in sequence stratigraphic interpretations is shown from three case studies: (1) a simulation of an idealized clastic system assuming constant clastic input and sinusoidal fourth- and third-order sea level variations, (2) simulations of the Permian mixed clastic-carbonate infill of the Midland basin, and (3) a detailed simulation of one third-order carbonate depositional sequence (lower-middle San Andres Formation) from the Northwest Shelf, Permian basin. Some general conclusions form these case studies include the following: (a) seismic and well log-defined topsets, forests, bottom-sets, and related event terminationsmore » can be unequivocally related to relative sea level fluctuations; (b) Exxon-type sequence boundaries are not necessarily seismically imageable and their identification on well logs is not straight forward; and (c) buildups and lateral variations in amplitude related to lithofacies variations can be modeled. Synthetic logs and seismic sections from stratigraphic forward models may be useful in constraining interpretations of subsurface data and in stratigraphic prediction.« less

Authors:
 [1];  [2]
  1. KSEPL (Shell Research), Rijswijk (Netherlands)
  2. Universitat Tubingen (Germany)
Publication Date:
OSTI Identifier:
6965403
Report Number(s):
CONF-9310237-
Journal ID: ISSN 0149-1423; CODEN: AABUD2
Resource Type:
Conference
Journal Name:
AAPG Bulletin (American Association of Petroleum Geologists); (United States)
Additional Journal Information:
Journal Volume: 77:9; Conference: American Association of Petroleum Geologists (AAPG) mid-continent section meeting, Amarillo, TX (United States), 10-12 Oct 1993; Journal ID: ISSN 0149-1423
Country of Publication:
United States
Language:
English
Subject:
02 PETROLEUM; 03 NATURAL GAS; BOUNDARY LAYERS; SEISMIC DETECTION; SEA LEVEL; VARIATIONS; SEDIMENTARY ROCKS; SIMULATION; STRATIGRAPHY; GEOLOGIC MODELS; AGE ESTIMATION; GEOLOGIC STRATA; SEDIMENTARY BASINS; SEISMIC WAVES; STRATIFICATION; TECHNOLOGY UTILIZATION; DETECTION; GEOLOGIC STRUCTURES; GEOLOGY; LAYERS; LEVELS; ROCKS; 020200* - Petroleum- Reserves, Geology, & Exploration; 030200 - Natural Gas- Reserves, Geology, & Exploration

Citation Formats

Shuster, M W, and Aigner, T. 2-D synthetic seismic and log cross sections from stratigraphic forward models. United States: N. p., 1993. Web.
Shuster, M W, & Aigner, T. 2-D synthetic seismic and log cross sections from stratigraphic forward models. United States.
Shuster, M W, and Aigner, T. 1993. "2-D synthetic seismic and log cross sections from stratigraphic forward models". United States.
@article{osti_6965403,
title = {2-D synthetic seismic and log cross sections from stratigraphic forward models},
author = {Shuster, M W and Aigner, T},
abstractNote = {In an effort to fully utilize deterministic stratigraphic forward modeling techniques in subsurface stratigraphic analysis, Shell has developed a computer interface to routinely create synthetic logs and one-dimensional and two-dimensional (2-D) seismic responses from 2-D stratigraphic simulations. Each 2-D stratigraphic model can contain up to 200 timelines defining age equivalent stratigraphic layers with laterally variable lithofacies and depths. Synthetic gamma-ray, density, and velocity responses are calculated for the simulated lithofacies using user-specified rock and fluid properties. Vertically incident synthetic seismograms are created using calculated reflection coefficients and user-defined input wavelets. Because the chronostratigraphy is know a priori, log correlations and the interpolated seismic geometries follow timelines exactly. The power of this technique as an aid in sequence stratigraphic interpretations is shown from three case studies: (1) a simulation of an idealized clastic system assuming constant clastic input and sinusoidal fourth- and third-order sea level variations, (2) simulations of the Permian mixed clastic-carbonate infill of the Midland basin, and (3) a detailed simulation of one third-order carbonate depositional sequence (lower-middle San Andres Formation) from the Northwest Shelf, Permian basin. Some general conclusions form these case studies include the following: (a) seismic and well log-defined topsets, forests, bottom-sets, and related event terminations can be unequivocally related to relative sea level fluctuations; (b) Exxon-type sequence boundaries are not necessarily seismically imageable and their identification on well logs is not straight forward; and (c) buildups and lateral variations in amplitude related to lithofacies variations can be modeled. Synthetic logs and seismic sections from stratigraphic forward models may be useful in constraining interpretations of subsurface data and in stratigraphic prediction.},
doi = {},
url = {https://www.osti.gov/biblio/6965403}, journal = {AAPG Bulletin (American Association of Petroleum Geologists); (United States)},
issn = {0149-1423},
number = ,
volume = 77:9,
place = {United States},
year = {Wed Sep 01 00:00:00 EDT 1993},
month = {Wed Sep 01 00:00:00 EDT 1993}
}

Conference:
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