Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 45 for “"Dolomitization"”.
-
Cementation and dolomitization of Mississippian limestones, Kentucky and Virginia
The Mississippian Newman Limestone (0-30 m thick) in eastern Kentucky contains pink-staining, aquifer-related cements (up to 750 ppm Mn+2); up to 1000 ppm Fe+2; δ¹⁸ -7.5 to -6.8 per mil; δ¹³C 1.7 to -6.8) that is non-luminescent (low Fe and Mn) in the recharge area, but becomes uniformly dully …
-
Regional dolomitization of Early Ordovician, Upper Knox Group, Appalachians
… Ordovician, Knox Unconformity development. Early dolomitization occurred penecontemporaneously with tidal flat progradation during fifth-order (up to 100 k.y.) sea-level falls as indicated by: abundant dolomite in cycles with well-developed tidal flat caps and scarce dolomite in cycles with no or …
-
Milankovitch-driven cyclicity and climate controlled dolomitization of a Late Triassic carbonate platform, Hungary
… subjected differing Milankovitch signals. Most dolomitization of the Hungarian carbonates occurred early in tidal flat settinfs during each high frequency cycle. Intertidal-supratidal dolomites are fine grained, Fe²⁺ and Mn²⁺ rich and slightly enriched in δ¹⁸O compared marine calcite cement, and …
-
Dolomitization and structural relations of the Deep River, North Adams and Pinconning oil fields, Michigan
Thesis (M.S.)--Michigan State University. Dept. of Geology, 1958
-
Subsurface dolomitization and porosity occlusion within Early to Middle Ordovician strata of the Illinois Basin, USA
… in the Illinois Basin indicate that subsurface dolomitization locally reduced primary porosity, and that the degree of reduction changes with location. Specifically, porosity occlusion by dolomitic cementation is pronounced in the Shakopee and Everton on the northern shelf of the basin, and, …
-
Mechanisms of dolomitization in seawater and origin of the Middle Ordovician dolomites in the Illinois Basin
This investigation focuses on the chemistry of dolomitization and the geochemical and petrographic characteristics of the Middle Ordovician limestones and dolostones in the Illinois basin.
-
Relative timing of dolomitization and silica cementation in the Cambrian Potosi and Eminence Dolomites in the Illinois Basin, USA
… have identified multiple events of subsurface dolomitization and quartz cementation within dissolution voids (vugs). A detailed petrographic study has therefore been undertaken to reconstruct the complex history of post-depositional subsurface physical and chemical alteration (diagenesis) of …
-
Sequence Development and Dolomitization of a Late Jurassic Giant Oil Reservoir, Arab-D Reservoir, Hawiyah (GHAWAR) and Harmaliyah Fields, Saudi Arabia
Thirty cores from the Late Jurassic uppermost Jubaila, Arab-D reservoir and Arab-D anhydrite in Hawiyah (Ghawar) and Harmaliyah fields, eastern Saudi Arabia were studied to document the detailed facies stacking and high resolution sequence stratigraphy. The Jubaila-Arab-D interval is a shallowing …
-
Depositional and diagenetic controls on porosity evolution in the "C" zone, Red River Formation (Upper Ordovician), Divide County, North Dakota
… Many previous investigators concluded that dolomitization is the dominant control on porosity distribution in the "C" zone, and subsequently tried to interpret porosity distribution on the basis of a single dolomitization model. Evidence uncovered in this study indicates that porosity …
-
Lithostratigraphic investigation of a Late Devonian carbonate-evaporite sequence; the Duperow Formation, Williston Basin, North Dakota
… and micritization, calcite cementation, dolomitization, compaction, dissolution, and anhydrite cementation. Only dolomitization and dissolution increase porosity in the rocks of the Duperow. Dolomitization is fabric selective, as only the stromatoporoid boundstone/floatstone and …
-
Petrography of the Midale subinterval in the Bottineau and Renville counties area, North Dakota
… and oolitic limestones, and primary anhydrite. Dolomitization of the limestones in varying stages is common and the dolomitized limestones are usually fine grained. Course crystals of secondary anhydrite are common as vug and fracture filling and as a replacement of the carbonates.</p> <p>The …
-
The sequence stratigraphic evolution of the Sturgeon Lake bank, central Alberta, Canada and its regional implications.
… growth. Within the Leduc Formation at SLS, dolomitization is pervasive and fabric destructive, enhances reservoir quality, and is not facies specific. Dolomitization most likely occurred within the burial environment.
-
Diagenesis And Controls On Porosity And Permeability In The Upper San Andres Formation Of West Texas
… XRD, XRF, and MICP. Results indicate that dolomitization enhances porosity, with intercrystalline and moldic porosity being dominant, while late-stage cementation and compaction reduce permeability. XRD reveals variations in clay and dolomite content correlating with reservoir quality, and …
-
Petrography and Diagenesis of Cambrian Dolomite in Tabei Uplift, Northern Tarim Basin, China
… that Cambrian dolomite formed in three stages of dolomitization: 1) syn-depositional or penecontemporaneous dolomitization, formed type 1 dolomite by penesaline seawater from slightly evaporative environment; 2) burial dolomitization, produced the crystalline dolomite with different crystal size …
-
Depositional and paragenetic controls on porosity development, upper Red River Formation, North Dakota
… burrowed facies is due to syndepositional dolomitization and later calcite solution and microfracturing. Maximum porosity values related to dolomitization and calcite dissolution occur in the burrowed horizons immediately above the impermeable organic units, which acted as barriers to …
-
Sedimentology and diagenesis of Lower to Middle Cambrian carbonate platform, Shady Dolomite, Virginia
… The Shady Dolomite records several episodes of dolomitization during burial, coeval with late Paleozoic deformation. Rare relict corcs of zone 1 dolomite were replaced and overgrown by zone 2A dolomite, the dominant replacement phase. After replacement dolomitization, the sequence was subjected …
-
Stratigraphy, depositional environments, and petroleum potential of the Three Forks Formation -- Williston Basin, North Dakota
… variety of diagenetic characteristics including dolomitization and precipitation of hematite, are identified and presented. These facies correlate well with electrofacies predicted by employing principal component analysis and clustering techniques to selected lithology-sensitive logs. …
-
Depositional environments, ichnology and diagenesis of the upper Frobisher-Alida beds of the Elkhorn Ranch and Roughrider fields of western North Dakota
… fluid movements. Mesogenetic diagenesis included dolomitization, silicification, replacement, chemical compaction, pressure solution and neomorphism. Multiple dolomitization episodes were due to the movements of magnesium-rich pore fluids released during pressure solution. </p>
-
Paleofluid Flow, Fracturing and Reservoir Implications in Foreland basins: an example from the Cretaceous Qamchuqa Formation, Kurdistan Iraq
… regional non-focused, strata-bound hydrothermal dolomitization followed by localized fault- and fracture-focused hydrothermal dolomitization. These hydrothermal fluid flows caused variable textural and compositional alteration, overgrowth and zonation in dolomite occurred in a fairly open …
-
Depositional history and diagenesis of the upper Mission Canyon and lower Charles Formations (Mississippian), Billings County, North Dakota
… through the Madison aquifer. </p><p>Eogenetic dolomitization of sublittoral deposits, which was the most prominent diagenetic process, took place through an evaporative reflux mechanism. Minor eogenetic dolomitization of littoral and supralittoral deposits took place by penecontemporaneous, …
Page 1 of 3