Geologic Structure and Seismic Analysis

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Presentation transcript:

Geologic Structure and Seismic Analysis Kentucky Geological Survey John B. Hickman, Paul D. Lake, David C. Harris, and James A. Drahovzal Trenton–Black River Research Consortium March 29, 2005 Columbus, OH Title slide

Structure and Seismic Analysis Structure and isopach maps Base of Devonian Shale Ordovician (top) Kope Fm Utica Shale Trenton Fm Black River Ls Knox Unconformity Basal Sandstones (needed as hydrothermal fluid conduit for dolomitization?) Top of Precambrian Basement Major structural features (esp. those affecting dolomitization) Assist in evaluating zones of potential hydrothermal dolomite development

Outline of Tasks Data Acquisition Load Seismic data Load Well Data Seismic, well logs, and stratigraphic well tops Load Seismic data Digital SEGY files into Kingdom Suite Raster images into PetraSeis Load Well Data Digital LAS files into Kingdom Suite & Petra Raster images into Petra Load Preliminary (i.e. any available) Well Tops

Outline, con’t. Use sonic logs for synthetic seismogram creation and creation of velocity model Correlate log tops to reflecting seismic horizons Interpret stratigraphy and structure from seismic Use velocity model to transform depths in time to depths in feet subsea Create 3D surfaces from seismic horizon and well based stratigraphic tops elevations Merge products with those of the other members of TBRRC

Newly Acquired Seismic Data Two new analog (paper copies) and three new digital (SEGY) Ohio seismic lines have been received and loaded Three new digital (SEG-Y) field scale seismic lines from eastern Kentucky have been received (from ABARTA) and loaded into Kingdom Suite™ software Two new digital (SEG-Y) regional seismic lines from central Ohio have been loaded into Kingdom Suite™ software (reprocessed COCORP lines)

Current Seismic Data Loaded

Well Data Loaded Total of 402 digital well log files loaded into Petra and Kingdom Suite software projects Includes sonic logs for 114 wells Preliminary set of tops loaded: 831 KY wells 103 OH wells 644 NY wells 101 PA wells 22 WV wells

Well Tops Picked or Loaded Current set of tops being picked for project: Ohio Shale Top of Ordovician Kope Sh Point Pleasant Fm Trenton Fm Black River Gp Deike and Millbrig Bentonites Wells Creek Dolomite

Well Tops Picked or Loaded, con’t. Current set of tops being picked for project: St. Peter Sandstone Knox Unconformity Rose Run Sandstone Conasauga Gp Rome Fm Basal & Mt. Simon Ss Precambrian Unconformity

Wells used for preliminary correlations

Southern App. Velocity Model Continuing to assist in time-to-depth calculations of seismic horizons, and aiding in stratigraphic correlation in areas of low resolution data A sixteen layer regional velocity model for the Southern Appalachian area, with an average error < 5%, based on well data Quality checking horizon tops based on time calculations ongoing

New Northern Region Velocity Model Created to help determine the time-to-depth of seismic horizons, and to aid in stratigraphic correlation in areas of low resolution data Formation tops from 745 wells, and sonic logs from 53 LAS files were used from the deep wells in PA and NY Sonic log data averaged with petrophysical software (Petra®) within groups of strata resulted in precise interval velocities

New Velocity Model, con’t. Interval velocities of sixteen layers (groups of strata) corresponding to possible seismic horizons were gridded over PA & NY project area, and edited for known fault trends In wells without sonic logs, internal velocities were calculated by the creating sonic log grids. These grids then were used to calculate the depth of formation tops in time.

Synthetic Seismograms Trenton-Black River

Interpretation of Current Data Initial framework of 648 deep well’s tops in KY complete Infilling with shallower wells, and addition of additional related members beginning Initial interpretation of NY, PA, and WV seismic horizons complete, OH and KY nearing completion QC and “fine tuning” of horizon picks ongoing

Seismic Interpretation 0 sec. 1 sec. 2 sec. 3 sec. NY-PA A A’ 1 sec. 2 sec. 3 sec. B B’ 0 sec. NY-PA A Well velocity based on picked tops and horizon picks (average vel is 15000) A B A’ B’ Paul Lake, 2004

Northern Rome Trough Section, WV J. Hickman, 2004

Eastern KY Rome Trough Section J. Hickman, 2004

WV Wrench Fault with Trenton Sag Knox Conasauga Rome PC Basement

Preliminary Tully Two Way Time Structure

Preliminary Trenton 2-Way Time Structure

Gridding horizons across adjacent seismic lines

PC map combining wells & seismic

Ordovician seismic response Regional differences in seismic character of the Trenton-Black River interval How does local stratigraphy affect the seismic image?

Trenton Isopach (ODGS)

Schuyler Co, NY Trenton shelf edge Trenton Isopach Schuyler Co, NY Trenton shelf edge

Broome Co, NY Trenton distal shelf Trenton Isopach Broome Co, NY Trenton distal shelf

Sandusky Co, OH Trenton, off Galena Platform shelf Trenton Isopach Sandusky Co, OH Trenton, off Galena Platform shelf Trenton PC Basement

Delaware Co, OH Trenton, Sebree sub-basin Trenton Isopach Delaware Co, OH Trenton, Sebree sub-basin

Harrison Co, OH near eastern Trenton shelf Trenton Isopach Harrison Co, OH near eastern Trenton shelf

Clay Co, WV above Rome Trough Trenton Isopach Clay Co, WV above Rome Trough

Leslie Co, KY above Rome Trough Trenton Isopach Leslie Co, KY above Rome Trough

What’s Next? Create regional fault trend maps Interpret magnitude and age of movement along fault trends Assist with interpretation of possible fairways of high reservoir potential

Tectonic Dolomitization, Rough Creek Fault Zone Ohio and Grayson Counties, Ky. OHIO Sebree Trough GRAYSON D. C. Harris, 2004

Note tight dolomite in Black River interval in center 4 wells. Conoco wells on ends are undolomitized. D. C. Harris, 2004

Central Southern New York

South-Southeast New York

North Central Ohio West Central Ohio

East Central Ohio

Southeastern KY Central WV