{"action":"create","ckan_id":null,"date_created":"Sat, 21 Feb 2026 20:34:22 GMT","date_finished":null,"harvest_job_id":"927b4632-bfd7-4287-9580-c422e57518da","harvest_source_id":"31f41541-38a0-400b-b240-10ebcb0acd9a","id":"1bc7503d-9a3c-459e-a599-b3a7ea1fbd2a","identifier":"https://dggs.alaska.gov/webpubs/metadata/PIR2013-5.xml","parent_identifier":null,"source_hash":"ea3c9f0b14ceaf9c9adc7b4c64ed0b85d270192837a46950e3e4d9724d45b3d5","source_raw":"\n\n\n\n\nHelmold, K.P.\nLePain, D.L.\nWilson, M.D.\nPeterson, C.S.\n2013\nPetrology and reservoir potential of Tertiary and Mesozoic sandstones, Cook Inlet, Alaska: A preliminary analysis of outcrop samples collected during 2007-2010 field seasons\ndocument, digital data download\n\nPreliminary Interpretive Report\nPIR 2013-5\n\n\nFairbanks, AK, USA\nAlaska Division of Geological & Geophysical Surveys\n\n34 p.\nhttp://dx.doi.org/10.14509/25035\n\n\n\nThe State of Alaska Division of Geological & Geophysical Surveys (DGGS) and Division of Oil & Gas (DOG) are currently engaged in a multi-year study of the hydrocarbon potential of the Tertiary and Mesozoic strata in Cook Inlet basin. Modal analyses and routine core analyses were performed on Tertiary and Mesozoic siltstones and sandstones collected during the 2007-2010 field seasons from six geographic areas in upper and lower Cook Inlet. The reservoir quality of Cook Inlet sandstones varies widely depending on their mineralogy, geologic age, burial depth, and depositional environment. Tuxedni and Naknek sandstones have poor reservoir quality and are likely to be of equally poor quality down dip. West Foreland sandstones examined have poor reservoir quality and are negatively influenced by their immature volcanic mineralogy. The Hemlock and Tyonek sandstones have good to excellent reservoir quality, largely resulting from their quartzose-feldspathic mineralogy that is physically and chemically stable and burial depths generally less than 3,000 m. It should be emphasized that our observations are based on a limited number of outcrop samples collected from widely dispersed localities.\nThe State of Alaska Division of Geological & Geophysical Surveys (DGGS) and Division of Oil & Gas (DOG) are currently engaged in a multi-year study of the hydrocarbon potential of the Tertiary and Mesozoic strata in Cook Inlet basin. This report presents petrographic and routine core-analysis data and provides preliminary interpretations of rock samples. The samples were collected from Tertiary sections on the Kenai Peninsula from Homer northward to Clam Gulch, Tertiary sections on the west side of Cook Inlet from Lewis River westward to Straight Creek, and sections of Mesozoic strata in lower Cook Inlet along the shores of Tuxedni Bay and the Iniskin Peninsula.\nThe DGGS metadata standard extends the FGDC standard to include elements that are required to facilitate our internal data management. These elements, referred to as \"layers,\" group and describe files that have intrinsic logical or topological relationships. Attribute information for the layers (entity) is included in this metadata file under the \"Entity_and_Attribute_Information\" section. The layers are titled: >sample-location-details:\tA CSV file with sample location details, map and sample reference numbers, geographic location, latitude, longitude, and formation assignment. >raw-and-summary-data:\tAn XLSX workbook providing raw and summary data. The spreadsheet is organized into the following tabbed worksheets: Table 2. Raw petrographic data in original format provided by Michael D. Wilson, Table 3. Raw petrographic data converted to format of Decker-Helmold, Table 4. Summary of petrographic data, Table 5. Grain size data in phi units, Table 6. Routine core analysis conducted by Weatherford Labs, Inc.\n\n\n\n\n2007\n2010\n\n\nground condition\n\n\nplanned\nunknown\n\n\n\n-153.41707\n-150.90787\n61.3868\n59.61781\n\n\n\n\nISO 19115 Topic Category\ngeoscientificInformation\n\n\nAlaska Division of Geological & Geophysical Surveys\nAleutian Arc\nChert\nDiagenesis\nFeldspar\nGraywacke\nMineralogy\nPermeability\nPetrography\nPetroleum Basin Study\nPetrology\nPorosity\nProvenance\nQuartz\nReservoir\nReservoir Evaluation\nResource Assessment\nSample Location\nSample Location Map\nSand\nSand and Gravel\nSediment Transport\nSedimentary\nSedimentary Rocks\nSedimentation\nTectonics\nVolcanic\nVolcanic Ash\nVolcaniclastics\nZeolites\nPetrographic\nOutcrop Samples\nThin Section\nOil Basins\nOil and Gas\nSedimentology\nReservoir Quality\nOil and Gas Basin\nPyroclastic Fall\nPyroclastic Flow\n\n\nAlaska Division of Geological & Geophysical Surveys\nBeluga Basin\nCook Inlet\nCook Inlet Basin\nSeward Peninsula\nKaguyak\nSouthcentral Alaska\nTyonek Quadrangle\nHomer\nKachemak Bay\nStraight Creek\nChuitna River\nMatanuska Valley\nCapps Glacier\nFritz Creek\nBluff Point\nFalls Creek\nClam Gulch\nTyonek\nSaddle Mountain\nIniskin Peninsula\nIniskin Bay\n\n\nAlaska Division of Geological & Geophysical Surveys\nAlaska Range Batholith\nBeluga Formation\nChugach Terrane\nKaguyak Formation\nKahiltna Terrane\nMatanuska Formation\nNaknek Formation\nSterling Formation\nTalkeetna Formation\nTyonek Formation\nWest Foreland Formation\nChisik Member\nHemlock Formation\nTuxedni Group\nPomeroy Arkose Member\n\n\nWalker, J. D., and Geissman, J. W., compilers, 2009, Geologic Time Scale: Geological Society of America\nEocene\nMiocene\nOligocene\nPaleogene\nPliocene\nTertiary\nLate Jurassic\nEarly Cretaceous\nEarly Jurassic\nLate Cretaceous\nNeogene\n\n\nThis report, map, and/or dataset is available directly from the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (see contact information below).\nAny 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. The 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. The State of Alaska makes no express or implied warranties (including warranties for merchantability and fitness) with respect to the character, functions, or capabilities of the electronic data 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 or any failure thereof or otherwise. In no event will the State of Alaska's liability to the Requestor or anyone else exceed the fee paid for the electronic service or product.\n\n\n\nAlaska Division of Geological & Geophysical Surveys\nJames Weakland\n\nGIS Analyst\n\nmailing and physical\n
3354 College Road
\nFairbanks\nAK\n99709-3707\nUSA\n\n(907)451-5029\n(907)451-5020\ndggsgis@alaska.gov\n8 am to 4:30 pm, Monday through Friday, except State holidays\n\n\nThe samples analyzed in this report were collected over four field seasons by many geologists from several agencies, often working in remote settings. Their assistance is gratefully acknowledged. They include Rick Stanley (U.S. Geological Survey); Marwan Wartes, Bob Gillis, Trystan Herriott, Dave Mauel (Alaska Division of Geological & Geophysical Surveys); Paul Decker, Laura Gregersen, Diane Shellenbaum, Meg Kremer (Alaska Division of Oil and Gas); Paul McCarthy, Jake Mongrain, Keane Richards (University of Alaska Fairbanks). We thank William R. Dickinson for discussions on interpreting tectonic settings from sandstone detrital modes. The manuscript benefited greatly from the review of Bob Gillis, although the authors take sole responsibility for its content. Special thanks go to Merlin 'Spanky' Handley of Pathfinder Aviation for his professionalism, affable demeanor, and skill in shepherding us in the field.\n\n\nBlodgett, R.B.\n2009\nReport on day trip (5/16/07) to visit Mesozoic rocks exposed in Port Graham and near Seldovia, southern Kenai Peninsula\nmap, digital data download\n\nPreliminary Interpretive Report\nPIR 2009-8C\n\n\nFairbanks, AK, USA\nAlaska Division of Geological & Geophysical Surveys\n\np. 109-116\nhttp://dx.doi.org/10.14509/20164\n\n\n\n\nFinzel, E.S.\nGillis, R.J.\nRidgway, K.D.\nLePain, D.L.\n2009\nPreliminary evaluation of basin margin exhumation and provenance of Cenozoic strata, Chuitna and Beluga rivers area, Cook Inlet forearc basin, Alaska\ndocument, digital data download\n\nPreliminary Interpretive Report\nPIR 2009-4\n\n\nFairbanks, AK, USA\nAlaska Division of Geological & Geophysical Surveys\n\n16 p\nhttp://dx.doi.org/10.14509/19641\n\n\n\n\nFinzel, E.S.\nRidgway, K.D.\nLePain, D.L.\n2009\nSedimentology of an Oligocene-Miocene incised paleovalley, Tyonek Formation, Cook Inlet Basin, Alaska\nmap, digital data download\n\nPreliminary Interpretive Report\nPIR 2009-8B\n\n\nFairbanks, AK, USA\nAlaska Division of Geological & Geophysical Surveys\n\np. 99-107\nhttp://dx.doi.org/10.14509/20163\n\n\n\n\nGillis, R.J.\nLePain, D.L.\nRidgway, K.D.\nFinzel, E.S.\n2009\nA reconnaissance view of an unnamed fault near Capps Glacier, northwestern Cook Inlet basin, and its potential as a regional-scale, basin-controlling structure\ndocument, digital data download\n\nPreliminary Interpretive Report\nPIR 2009-3\n\n\nFairbanks, AK, USA\nAlaska Division of Geological & Geophysical Surveys\n\n9 p\nhttp://dx.doi.org/10.14509/19503\n\n\n\n\nHickey, J.J.\nWilson, M.D.\nReifenstuhl, R.R.\n2007\nPetrographic study of 50 samples from the Tertiary sandstone of Cook Inlet, Alaska: potential tight gas reservoirs\ndocument, digital data download\n\nReport of Investigation\nRI 2007-2\n\n\nFairbanks, AK, USA\nAlaska Division of Geological & Geophysical Surveys\n\n64 p\nhttp://dx.doi.org/10.14509/15774\n\n\n\n\nLePain, D.L.\nWartes, M.A.\nMcCarthy, P.J.\nStanley, R.G.\nSilliphant, L.J.\nPeterson, Shaun\nShellenbaum, D.P.\nHelmold, K.P.\nDecker, P.L.\nMongrain, Jacob\nGillis, R.J.\n2009\nFacies associations, sand body geometry, and depositional systems in Late Oligocene-Pliocene Strata, southern Kenai Peninsula, Cook Inlet, Alaska: Report on progress during the 2006-07 field season\nmap, digital data download\n\nPreliminary Interpretive Report\nPIR 2009-8A\n\n\nFairbanks, AK, USA\nAlaska Division of Geological & Geophysical Surveys\n\np. 1-97\nhttp://dx.doi.org/10.14509/20162\n\n\n\n\nLePain, D.L.\n2009\nPreliminary results of recent geologic investigations in the Homer-Kachemak Bay area, Cook Inlet Basin: Progress during the 2006-2007 field season\ndocument, digital data download\n\nPreliminary Interpretive Report\nPIR 2009-8\n\n\nFairbanks, AK, USA\nAlaska Division of Geological & Geophysical Surveys\n\n187 p\nhttp://dx.doi.org/10.14509/20161\n\n\n\n\nLoveland, A.M.\n2010\nResults of mercury-injection capillary pressure tests on outrcrop samples in the Tyonek area of Cook Inlet\ndocument, digital data download\n\nRaw Data File\nRDF 2010-1\n\n\nFairbanks, AK, USA\nAlaska Division of Geological & Geophysical Surveys\n\n102 p\nhttp://dx.doi.org/10.14509/20481\n\n\n\n\nLoveland, Andrea\n2009\nMercury injection capillary pressure results from outcrop samples in the Homer area of Cook Inlet\nmap, digital data download\n\nPreliminary Interpretive Report\nPIR 2009-8D\n\n\nFairbanks, AK, USA\nAlaska Division of Geological & Geophysical Surveys\n\np. 117-187\nhttp://dx.doi.org/10.14509/20165\n\n\n\n\nReger, R.D.\n2009\nReinterpretation of the Kaloa deposits near Granite Point, northwestern Cook Inlet, Alaska\ndocument, digital data download\n\nPreliminary Interpretive Report\nPIR 2009-2\n\n\nFairbanks, AK, USA\nAlaska Division of Geological & Geophysical Surveys\n\n8 p\nhttp://dx.doi.org/10.14509/18241\n\n\n\n\nShellenbaum, D.P.\nGregersen, L.S.\nDelaney, P.R.\n2010\nTop Mesozoic unconformity depth map of the Cook Inlet Basin, Alaska\nmap, digital data download\n\nReport of Investigation\nRI 2010-2\n\n\nFairbanks, AK, USA\nAlaska Division of Geological & Geophysical Surveys\n\n1 sheet, scale 1:500,000\nhttp://dx.doi.org/10.14509/21961\n\n\n\n\nZippi, P.A.\nLoveland, A.M.\n2012\nPalynological analysis of 228 outcrop samples from the Kenai, Seldovia, and Tyonek quadrangles, Cook Inlet region, Alaska\ndocument, digital data download\n\nRaw Data File\nRDF 2012-1\n\n\nFairbanks, AK, USA\nAlaska Division of Geological & Geophysical Surveys\n\n10 p\nhttp://dx.doi.org/10.14509/23723\n\n\n\n\n\nThis report has received one technical review by a scientist familiar with the subject matter. We incorporated the reviewer's suggestions into the final draft.\n\nNot applicable\nThe data presented in this report should be viewed as preliminary. It should be emphasized that our observations are based on a limited number of outcrop samples collected from widely dispersed localities. Future data may provide additional insight into the petrology and reservoir potential of Tertiary and Mesozoic sandstones of Cook Inlet, Alaska.\n\n\nLocation coordinates were obtained using handheld GPS units with a typical error of 7 m or less.\n\n\n\n\nSample collection and geologic formation assignment - Tertiary and Mesozoic siltstones and sandstones from six geographic areas in the upper and lower Cook Inlet were collected during the 2007-2010 field seasons. Initial formation assignment for each sample was based on previously published maps and ongoing DGGS/DOG fieldwork in the area. In some cases assignments were modified after the modal data were analyzed to ensure petrographically similar samples were included in the same unit. After much experimentation a procedure was developed to acquire usable samples that could be plugged for analysis. This entailed excavating large \"bread-loaf\" sized samples that were immediately wrapped in several layers of plastic wrap and secured in canvas bags with duct tape. These samples were later placed in plastic bags and covered with a thin coating of epoxy resin prior to shipping.\n2007-2010\n\n\nModal analysis - Samples were submitted to Michael D. Wilson, a geological consultant in Lakewood, CO, for modal analysis. He counted a minimum of 300 grains via the traditional point-counting method (Decker and Helmold, 1985) to determine the composition of the framework (detrital grains) and intergranular components (matrix, cement, porosity). A second count of 200 grains (including matrix) was conducted for grain size.\n2011\n\n\nRoutine core analysis - Samples were submitted to Weatherford Labs, Inc. for routine core analysis to determine porosity and permeability.\n2011\n\n\nData interpretation - Modal analysis and porosity and permeability datasets were plotted and examined to provide a preliminary interpretation of the petrology and reservoir potential of the rock units. See manuscript for more information about the interpretive process and results. The manuscript also provides a detailed list of pertinent references.\n2011-2012\n\n\n\n\npoint\n\n\n\n\nNorth American Datum of 1927\nNorth American Datum of 1927\n6378206.4\n294.9786982\n\n\n\n\n\n\npir2013-5-sample-location-details.csv\nA CSV file with sample location details, map and sample reference numbers, geographic location, latitude, longitude, and formation assignment.\nAlaska Division of Geological & Geophysical Surveys\nsample-location-details\n\n\nDGGS_SAMPLE\nLabel assigned in the field to identify the sample.\nAlaska Division of Geological & Geophysical Surveys and the Alaska Division of Oil & Gas\n\nFollows DGGS convention 20YYAAA9999X: YY=last two digits of year, AAA=geologist initials (one to three characters), 9999=unique station number, X=unique alpha character designating a sample was taken at the field station. Geologists' initials represent the following: DL = Dave LePain, JRM = Jacob Mongrain, BG = Bob Gillis, MAW = Marwan Wartes.\n\n\n\nREFERENCE_NUMBER\nNumeric label assigned to identify the sample throughout this publication.\nAlaska Division of Geological & Geophysical Surveys and the Alaska Division of Oil & Gas\n\n\n1\n217\nNot applicable\n\n\n\n\nGENERAL_LOCATION\nGeneral location from which the sample was collected.\nAlaska Division of Geological & Geophysical Surveys and the Alaska Division of Oil & Gas\n\nSamples were collected from outcrops and measured sections in the Kenai Peninsula from Homer northward to Clam Gulch, the west side of Cook Inlet from Lewis River westward to Straight Creek, and in lower Cook Inlet along the shores of Tuxedni Bay and the Iniskin Peninsula. See manuscript for sample location maps.\n\n\n\nSPECIFIC_LOCATION\nSpecific location from which the sample was collected. These values include nicknames which reflect the actual usage of the geologists who worked on the outcrops and collected the samples.\nAlaska Division of Geological & Geophysical Surveys and the Alaska Division of Oil & Gas\n\nSamples were collected from outcrops and measured sections in the Kenai Peninsula from Homer northward to Clam Gulch, the west side of Cook Inlet from Lewis River westward to Straight Creek, and in lower Cook Inlet along the shores of Tuxedni Bay and the Iniskin Peninsula. See manuscript for sample location maps.\n\n\n\nLATITUDE\nLatitude, NAD27\nAlaska Division of Geological & Geophysical Surveys and the Alaska Division of Oil & Gas\n\n\n59.61781\n61.3868\ndecimal degrees\n\n\n\n\nLONGITUDE\nLongitude, NAD27\nAlaska Division of Geological & Geophysical Surveys and the Alaska Division of Oil & Gas\n\n\n-153.41707\n-150.90787\ndecimal degrees\n\n\n\n\nUNIT\nGeologic unit assignment for each sample.\nAlaska Division of Geological & Geophysical Surveys and the Alaska Division of Oil & Gas\n\n\nProposed stratigraphic nomenclature for Kenai Group, Cook Inlet\nGeologic unit assignments were based on previously published maps and ongoing DGGS/DOG fieldwork in the area, primarily Curry and others (1990), Swenson (2003), Little and Naeser (1989), Plafker and others (1989), and Nokleberg and others (1994). See manuscript for a complete reference list and discussion of geologic unit assignments.\n\n\n\n\nAGE\nAge of the geologic unit.\nAlaska Division of Geological & Geophysical Surveys and the Alaska Division of Oil & Gas\n\n\nThis report\nThe age values of the geologic units were derived from previously published sources. See manuscript for a complete reference list.\n\n\n\n\nCOMMENTS\nAdditional descriptive details about the stratigraphic location of the sample.\nAlaska Division of Geological & Geophysical Surveys and the Alaska Division of Oil & Gas\n\nInterpretations are based on previously published maps and ongoing DGGS/DOG fieldwork in the area. See manuscript for a complete reference list.\n\n\n\nnull or blank\nNull or blank values indicate that additional descriptive details were not provided by the geologist who collected the sample.\nAlaska Division of Geological & Geophysical Surveys and the Alaska Division of Oil & Gas\n\n\n\n\n\n\npir2013-5-raw-and-summary-data.csv\nAn XLSX workbook providing raw and summary data. The spreadsheet is organized into the following tabbed worksheets: Table 2. Raw petrographic data in original format provided by Michael D. Wilson, Table 3. Raw petrographic data converted to format of Decker-Helmold, Table 4. Summary of petrographic data, Table 5. Grain size data in phi units, Table 6. Routine core analysis conducted by Weatherford Labs, Inc.\nAlaska Division of Geological & Geophysical Surveys\nraw-and-summary-data\n\n\n\n\n\n\n\nAlaska Division of Geological & Geophysical Surveys\n\n\nmailing and physical\n
3354 College Road
\nFairbanks\nAK\n99709-3707\nUSA\n\n(907)451-5020\n(907)451-5050\ndggspubs@alaska.gov\n8 am to 4:30 pm, Monday through Friday, except State holidays\nPlease view our website (http://www.dggs.alaska.gov) for the latest information on available data. Please contact us using the e-mail address provided above when possible.\n\n\nPIR 2013-5\nThe State of Alaska makes no expressed or implied warranties (including warranties for merchantability and fitness) with respect to the character, functions, or capabilities of the electronic data 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 or any failure thereof or otherwise. In no event will the State of Alaska's liability to the Requestor or anyone else exceed the fee paid for the electronic service or product.\n\nDGGS publications are available as free online downloads or you may purchase paper hard-copies or digital files on CD/DVD or other digital storage media by mail, phone, fax, or email from the DGGS Fairbanks office. To purchase this or other printed reports and maps, contact DGGS by phone (907-451-5020), e-mail (dggspubs@alaska.gov), or fax (907-451-5050). Payment accepted: Cash, check, money order, VISA, or MasterCard. Turnaround time is 1-2 weeks unless special arrangements are made and an express fee is paid. Shipping charge will be the actual cost of postage and will be added to the total amount due. Contact us for the exact shipping amount.\nContact DGGS for current pricing\n\n\n\n\nASCII tabular files\n\n\n\n\n\nhttp://dx.doi.org/10.14509/25035\n\n\n\n\n\nFree download\n\n\n\n20130425\n\n\n\nMetadata manager\n\n\nmailing and physical\n
3354 College Road
\nFairbanks\nAK\n99709-3707\nUSA\n\n(907)451-5020\n\n\nFGDC Content Standard for Digital Geospatial Metadata\nFGDC-STD-001-1998\nIf the user has modified the data in any way they are obligated to describe the types of modifications they have performed in the supporting metadata file. User specifically agrees not to imply that changes they made were approved by the Alaska Department of Natural Resources or Division of Geological & Geophysical Surveys.\n\nhttp://www.dggs.alaska.gov/metadata/dggs.ext\ndggs metadata extensions\n\n\n\n","source_transform":null,"status":"error"}