a3e24b3f-54b1-470f-ba82-552cc4309ecb_source eng; USA utf8 dataset Metadata manager 907-451-5020 State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys Fairbanks AK 99709-3707 USA pointOfContact 2010-12-04 ISO 19115 Geographic Information - Metadata ISO 19115:2003/Cor.1:2006(E) Top Mesozoic unconformity depth map of the Cook Inlet Basin, Alaska 2010-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska publisher Shellenbaum, D.P. originator Gregersen, L.J. originator Delaney, P.R. originator http://dx.doi.org/10.14509/21961 mapDigital Report of Investigations RI 2010-2 1 sheet, scale 1:500,000 Alaska Division of Oil and Gas personnel collected and interpreted various data sources related to the interpretation of the Base Tertiary unconformity surface in the Cook Inlet Basin, Alaska.Data sources included public literature, public well data information (from the AOGCC-Alaska Oil and Gas Conservation Commission), a palynology database (Greater Cook Inlet Stratigraphic Palynology Control Database and Stud,Zippi, P.A., 2006) and over 2000 miles of 2D marine seismic data (CI-88 and CI-89 licensed from, and complements of, CGGVeritas.) Interpreted formation tops of the Base Tertiary unconformity are tabulated on the map. The purpose of the map is to provide an interpretation of the Cook Inlet basin Base Tertiary depth structure to the public. While most oil and gas exploration companies active in the Cook Inlet Basin have proprietary databases of seismic and well data with which they have created proprietary depth surface maps, a detailed map incorporating a significant amount of seismic data has not been available in the public domain, and to new companies who may be interested in exploring in the basin.This map incorporates seismic data over most of the marine portion overlying the basin.Additionally, this map will be used in a subsequent map of the Mesozoic subcrop surfaces, where Cretaceous and Jurassic subcrops will be displayed on the Base Tertiary depth surface. completed notPlanned Structure Map Depth Interpretation Basins Subsurface Structure theme Alaska Division of Geological & Geophysical Surveys Cook Inlet Cook Inlet Basin Kenai Quadrangle Seldovia Quadrangle Tyonek Quadrangle place Alaska Division of Geological & Geophysical Surveys Mesozoic temporal Alaska Division of Geological & Geophysical Surveys The State of Alaska makes no express or implied warranties (including warranties of merchantability and fitness) with respect to the character, function, or capabilities of the electronic services or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity whether from the use of the electronic services or products, any failure thereof, or otherwise, and in no event will the State of Alaska's liability to the requester or anyone else exceed the fee paid for the electronic service or product. otherRestrictions Use Constraints: Any hard copies or published datasets utilizing these datasets shall clearly indicate their source. If the user has modified the data in any way, the user is obligated to describe the types of modifications the user has made. User specifically agrees not to misrepresent these datasets, nor to imply that changes made by the user were approved by the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys. otherRestrictions Access Constraints: This report, map, and/or dataset are available directly from the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (see contact information below). vector eng; USA geoscientificInformation -155.00 -149.00 59.00 62.00 2010-01-01 This dataset includes three shapefiles and an CSV spreadsheet.The files are organized into four entities as described in this metadata file under the "Entity_and_Attribute_Information" section. The files are as follows: >control-points Well locations and interpreted depth to top Mesozoic unconformity in oil and gas wells. This table is provided as Table 1 on the printed map and in the csv file "control-points.csv" >contours Lines of equal elevation (shapefile) >faults Polyline representing the location of a displacement of rocks along a planar surface (shapefile) >folds Polyline indicating the location of an anticlinal or synclinal fold axis (shapefile) true SHP and CSV unknown PDF unknown State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys 907-451-5020 907-451-5050 3354 College Road Fairbanks AK 99709-3707 USA dggspubs@alaska.gov 8 am to 4:30 pm, Monday through Friday, except State holidays Please view our web site (http://www.dggs.alaska.gov) for the latest information on available data. Please contact us using the e-mail address provided above when possible. distributor see http://dx.doi.org/10.14509/21961 Free download Free download http://dx.doi.org/10.14509/21961 SHP and CSV CSDGM IMPORT ERROR: No digtinfo/formcont information http://dx.doi.org/10.14509/21961 PDF CSDGM IMPORT ERROR: No digtinfo/formcont information dataset Horizontal Positional Accuracy Report Horizontal positional accuracy of entities outside of the two-dimensional seismic coverage area and where there is little well control is difficult to quantify.Error at any given point results from uncertainties in a) the depth pick in wells, b) interpolation between and extrapolation away from wells, c) time picks on seismic, d)variations in the seismic velocity field, and e) gridding, contouring, and smoothing artifacts, particularly in areas of sparse seismic and well control. Vertical Positional Accuracy Report The location accuracy of interpreted depths displayed by the depth contours and presented in the "contours file" is discussed in Horizontal Positional Accuracy Report. The depth to the top Mesozoic unconformity for each well is presented in table 1 (Depth to top Mesozoic unconformity in oil and gas wells) and was interpreted using borehole geophysical log character, lithologic logs, and palynology data. The accuracy of our interpreted depths varies according the quality and density of the available data. Additional detail regarding the accuracy of our interpretations at each specific hole is not available. The map was constructed primarily from marine seismic reflection data and oil and gas wells that penetrated the top Mesozoic unconformity.Where the well control is too dense to differentiate at the 1:500,000 scale, an inset map is provided. Previous mapping and well penetrations were used to interpret the top Mesozoic unconformity depth surface where seismic was not available.The data set displays contours as well as fault and fold traces.This dataset does not include locations of oil and gas wells or seismic lines used to interpret the top Mesozoic unconformity. The map was constructed primarily from marine seismic reflection data and oil and gas wells that penetrated the top Mesozoic unconformity.Where the well control is too dense to differentiate at the 1:500,000 scale, an inset map is provided. Previous mapping and well penetrations were used to interpret the top Mesozoic unconformity depth surface where seismic was not available.The data set displays contours as well as fault and fold traces.This dataset does not include locations of oil and gas wells or seismic lines used to interpret the top Mesozoic unconformity. The digitized lines representing faults, folds, and contours in this dataset were checked visually for duplication using ESRI ArcMap software. This lineage was generated by the FGDC CSDGM to 19139 transformation Well Interpretation - Public well logs were obtained from the Alaska Oil and Gas Conservation Commission (AOGCC). The depth to the top Mesozoic unconformity was interpreted using borehole geophysical log character, lithologic logs, and palynology data (Zippi, 2006). Where available, sonic and density logs were edited and combined to create synthetic seismograms used in calibrating to the seismic data. 2010-01-01T00:00:00 Seismic Interpretation - The seismic dataset used for interpretation consists of proprietary, speculative two-dimensional marine data (CI88 and CI89 prefix lines, owned and marketed by CGGVeritas and used by the Alaska Department of Natural Resources with permission from CGGVeritas). To tie the seismic data to the well data, calibrations were attempted for all synthetic seismograms of wells on or near seismic lines. Well ties to seismic were analyzed both visually and statistically. Two wells yielded synthetic seismogram to seismic ties of good quality to the top Mesozoic unconformity. Additional synthetic seismograms were useful in predicting the seismic character of the West Foreland Formation. Check shot velocity surveys were publicly available from two wells, OCS 0243 (Falcon) #1 and OCS 0086 (Guppy) #1. Depth-variant velocities were calculated from the synthetic seismogram ties and from the measured check shots to generate a depth and spatially variant velocity field. The following data and observations were integrated to generate the top Mesozoic unconformity seismic interpretation: 1) Time-to-depth relationships based on synthetic seismograms and checkshot velocity surveys 2) Top Mesozoic unconformity well picks displayed in time 3) Top West Foreland Formation seismic interpretation. This prominent seismic horizon is a short distance above, and generally conformable with, the top Mesozoic unconformity. Synthetic seismograms at this horizon generally showed a significant decrease in acoustic impedance, which should translate to a consistent strong reflector on the seismic.Interpretation of this horizon helped guide the underlying top Mesozoic unconformity pick. 4) The top Mesozoic is sometimes an angular unconformity, and seismic reflectors below it can have steeper dips, and be truncated by the unconformity surface. 2010-01-01T00:00:00 Seismic time-to-depth conversion - Two-way time seismic picks on the top Mesozoic unconformity were gridded to form a surface.Time values were extracted at well penetrations by piercing the time surface with the well paths. The top Mesozoic unconformity depths at the well penetrations were divided by one-way time values to create ‘pseudo-velocities’, or average velocities from the horizon to the surface. An implicit assumption in this depth conversion methodology is that the structural dip varies smoothly between control points. However, wells are mostly drilled on major structural highs in Cook Inlet, resulting in additional velocity control points being needed in areas of inadequate sampling, predominantly in the deeper parts of the basin. The additional control point values were estimated from cross plots of time versus pseudo-velocity, extrapolating an interpreted time-velocity slope to the deeper times observed on the seismic. The velocities from well penetrations and added control were then gridded to form a horizon velocity surface, which was multiplied with the seismic one-way time surface to create a depth surface. The depth surface contours were hand edited to remove computer-generated artifacts, which were especially apparent on the edges of seismic control and near faults and other areas of strong structural variability. 2010-01-01T00:00:00 Interpretation Outside Seismic Control - The following data were used to interpret the top Mesozoic unconformity depth surface where seismic was not available: 1) Well penetrations 2) Bounding faults and fold axes 3) Contacts between Mesozoic and Tertiary geologic units from surface geologic mapping 4) Structural contour maps from AOGCC annual reports. 2010-01-01T00:00:00 Digital Cartography - Contours, fold axes, and faults were initially constructed using GeoGraphix software.Due to software issues, the data was not exported directly from GeoGraphix in shapefile format.Rather, the data was saved as a .pdf document and sent to Design Presentation Associates for georeferencing and vectorization of all line work.The line work was then checked for positional accuracy and completeness and was attributed in ESRI ArcGIS.All final annotation, editing, and layout was done in CorelDraw. 2010-01-01T00:00:00 Base layer was extracted from State of Alaska, Department of Natural Resources, Alaska Statewide Core GIS database. 2010-01-01T00:00:00 Source Contribution: stratigraphic palynology controlSource Type: online Greater Cook Inlet stratigraphic palynology control database and study 2006-01-01 publication Zippi, P.A. originator www.biostratigraphy.com documentDigital unpublished proprietary report, 187 p. 2006-01-01 Source Contribution: well dataSource Type: online Annual Report and public well databases 2010-01-01 publication Alaska Oil & Gas Conservation Commission (AOGCC) originator http://doa.alaska.gov/ogc documentDigital Annual Report and public well databases 2010 2010-01-01 Source Contribution: structure contour dataSource Type: online Alaska Oil and Gas Report 2009 2010-01-01 publication Alaska Division of Oil & Gas Anchorage Alaska publisher Alaska Division of Oil & Gas originator http://www.dog.dnr.state.ak.us/oil/products/publications/publications.htm documentDigital 2010-01-01 Source Contribution: well logsSource Type: online USA Well Log Index 2010-01-01 publication Canadian Stratigraphic Services Lithologic Logs originator www.canstrat.com tableDigital choose "log index" for details 2010-01-01 Source Contribution: geologySource Type: paper 250000 Map showing geology, wildcat wells, Tertiary plant-fossil localities, K-Ar age dates and petroleum operations, Cook Inletarea, Alaska 1976-01-01 publication Magoon, L.B originator Adkison, W.L originator Egbert, R.M. originator mapDigital USGS Miscellaneous Investigation Map I-1019 3 sheets, scale 1:250,000 1976-01-01 Source Contribution: geologic mapSource Type: paper 250000 Preliminary Geologic Map of the Cook Inlet Region, Alaska 2009-01-01 publication Wilson, F.H. originator Hults, C.P. originator Schmoll, H.R. originator Haeussler, P.J. originator Schmidt, J.M. originator Yahle, L.A. originator Labay, K.A. originator mapDigital USGS Open File Report OF 2009-1108 2 sheets, scale 1:250,000 2009-01-01 Source Contribution: seismic dataSource Type: online CGGVeritas CI88 and CI89 marine 2D seismic speculative data 2010-01-01 publication CGGVeritas, 2010 originator www.cggveritas.com documentDigital website under Products & Services / Data Library for details 2010-01-01 Source Contribution: base mapSource Type: digital file State of Alaska, Department of Natural Resources, Alaska Statewide Core GIS database publication DNR Staff originator mapDigital 2010-01-01 otherRestrictions Metadata Use Constraints: If the user has modified this metadata file in any way, the user is obligated to describe the types of modifications the user has made. User specifically agrees not to misrepresent this metadata file, nor to imply that changes made by the user were approved by the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys. unknown This metadata was automatically generated from the FGDC Content Standard for Digital Geospatial Metadata standard (version FGDC-STD-001-1998) using the 2019-08-12T11:11:00 version of the FGDC CSDGM to ISO 19139 transform. Metadata manager 907-451-5020 State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys Fairbanks AK 99709-3707 USA pointOfContact