Download or read book Petrographic Investigation Into the Development of Secondary Porosity in Sandstones a Case Study of the Cambrian Mount Simon and Galesville Sandstones Illinois Basin written by Mojisola Abosede KunleDare and published by . This book was released on 2005 with total page 398 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Petrographic studies of the Mount Simon and Galesville sandstones (Cambrian, Illinois basin) reveal the presence of secondary porosity that developed during mesodiagenesis. The Mount Simon Sandstone contains secondary porosity by hematite cement dissolution and minor framework grain (feldspar and quartz) dissolution. Early hematite cement preserved potential porosity during compaction. The Galesville Sandstone contains 1-8% secondary porosity by framework grain (mainly feldspar with minor rock fragment and quartz) dissolution. This porosity was preserved in a mechanically stable, compaction resistant framework of quartz grains; this phenomenon is named "The Buckyball Effect" in this study. In the Mount Simon Sandstone, lamination is defined by the presence or lack of hematite cement. Hematite rich laminae have high porosity, contain rounded quartz grains rimmed by hematite, and hematite patches within pore space; whereas nonhematite cemented laminae have low porosity and consist of sutured grains with intergranular detrital (2M 1) illite. The laminations resulted from periodic synsedimentary hematite cementation. Upon burial, non-hematite cemented laminae became sutured by pressure solution. Hematite cemented laminae preserved intergranular volume by resisting compaction. Subsequent dissolution of hematite cement by basinal fluids resulted in new porosity. Sutured zones present permeability barriers (0.1-2.7 md horizontal and 2.9-4.0 md vertical permeability) compared to non-sutured zones (4.3-12.7 md horizontal and 10.2-12.7 md vertical permeability). This study is the first report of this type of suturing and its effect on reservoir properties in the Mount Simon Sandstone. X-Ray diffraction studies of Eau Claire Formation shales reveal that the

Download or read book Dissertation Abstracts International written by and published by . This book was released on 2006 with total page 862 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Characterization and Paleoenvironmental Significance of the North Central Wisconsin Loess Sheet written by Kristine Emma Stanley and published by . This book was released on 2008 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Porosity Water Chemistry Cement and Grain Fabric written by Thomas A. Metarko and published by . This book was released on 1980 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Petrology and Reservoir Paragenesis in the Sussex B Sandstone of the Upper Cretaceous Cody Shale House Creek and Porcupine Fields Powder River Basin Wyoming written by Debra K. Higley and published by . This book was released on 1992 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: A multidisciplinary approach to research studies of sedimentary rocks and their constituents and the evolution of sedimentary basins, both ancient and modern.

Download or read book Investigation on Porosity and Permeability Change of Mount Simon Sandstone Knox County IN USA Under Geological CO 2 Sequestration Conditions written by and published by . This book was released on 2016 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: A numerical model was developed to simulate reactive transport with porosity and permeability change of Mount Simon sandstone (samples from Knox County, IN) after 180 days of exposure to CO2-saturated brine under CO2 sequestration conditions. The model predicted formation of a high-porosity zone adjacent to the surface of the sample in contact with bulk brine, and a lower porosity zone just beyond that high-porosity zone along the path from sample/bulk brine interface to sample core. The formation of the high porosity zone was attributed to dissolution of quartz and muscovite/illite, while the formation of the lower porosity zone adjacent to the aforementioned high porosity zone was attributed to precipitation of kaolinite and feldspar. The model predicted a 40% permeability increase for the Knox sandstone sample after 180 days of exposure to CO2-saturated brine, which was consistent with laboratory-measured permeability results. Model-predicted solution chemistry results were also found to be consistent with laboratory-measured solution chemistry data. Initial porosity, initial feldspar content and the exponent n value (determined by pore structure and tortuosity) used in permeability calculations were three important factors affecting permeability evolution of sandstone samples under CO2 sequestration conditions. 1.

Download or read book The relation of sandstone diagenesis to petrology and depth written by Mamdouh Abdel-Aal Shebl and published by . This book was released on 1985 with total page 322 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Petrology and Depositional Facies of Siliciclastic Rocks of the Middle Ordovician Simpson Group Mazur Well Southeastern Anadarko Basin Oklahoma written by Romeo M. Flores and published by . This book was released on 1989 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Depositional Controls on the Late Campanian Sego Sandstone and Implications for Associated Coal forming Environments in the Uinta and Piceance Basins written by Karen J. Franczyk and published by . This book was released on 1989 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Sandstone Petrography Petrology and Modeling written by Thomas R. Taylor and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume provides both an updated foundation in modern sandstone petrology and a practical guide for the petrographic analysis of sandstones. Sandstones typically undergo enormous changes in their mechanical and fluid-flow properties from deposition through burial to the present day. Quantitative, rigorously collected petrographic data provide the best available basis for understanding the controls on these properties, which are of fundamental importance in engineering and the geosciences. For instance, sandstone reservoir characteristics are essential controls on fluid production (e.g., geothermal energy and hydrocarbons) and injection (e.g., greenhouse gases and contaminants). The spatial and temporal variations in sandstone properties are central concerns in fields such as paleohydrology, structural deformation, geomechanics, and seismology.

Download or read book Petrography Porosity and Permeability of Chesterian Sandstones upper Mississippian Southern Illinois U S A written by Joyce Ling-Mei Ou and published by . This book was released on 1984 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Sedimentary and Petrographic Analysis of the St Peter Sandstone written by George Alfred Thiel and published by . This book was released on 1935 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Secondary Reservoir Porosity in the Course of Sandstone Diagenesis written by Volkmar Schmidt and published by . This book was released on 1983 with total page 125 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Cambrian early Ordovician Sequence Stratigraphy and Mount Simon Sandstone Petrology Michigan Basin written by Jeffrey T. Cottingham and published by . This book was released on 1990 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Petrology Diagenesis and Reservoir Potential of the Surat Basin Sandstones with Special Reference to Hydrocarbon Exploration written by Hanif M. Hawlader and published by . This book was released on 1989 with total page 616 pages. Available in PDF, EPUB and Kindle. Book excerpt: The detrital composition of the Jurassic and Lower Cretaceous Surat Basin sandstones comprises a wide spectrum ranging from quartzarenite through sublitharenite and feldsarenite/lithic feldsarenite to feldspathic litharenite. The sandstones are subdivided into two petrofacies: quartzose having more than 50% QFR detrital quartz, and labile having less than 50% detrital quartz. The results of petrographic modal analyses illustrate the characteristically dual-provenance basin-fill pattern of the succession, namely, an andesitic magmatic arc to the east-northeast and a stable craton consisting of plutono-metamorphic terrains and sedimentary and silicic volcanic rocks in older basins and platforms in the flanking cratonic regions. The labile sandstones are derived from the magmatic arc which intermittently shed volcanogenic detritus into the subsiding foreland basin. Conversely, the quartzose facies received predominantly cratonic input (deposited during waning phases of magmatism in the arc and concomitant gentle rise of the foreland) with some additional sediments from the arc which presumably was dissected to varying degrees during these periods of relative tectonic quiescence. Sandstones of the whole Mesozoic succession in the Surat Basin comprise several petrologic cycles each of which begins with a craton-derived quartzose facies and ends with an arcderived quartz-poor labile facies. These cycles reflect the episodic tectonic activity of the arc-craton couplet during basin evolution. -- A study of the geologic evolution of sandstone reservoir characteristics suggests that compaction and cementation have both reduced primary porosity and permeability to an extent that is dependent on detrital composition and texture. On the other hand, subsequent dissolution of framework grains and cement have created secondary porosity that is present in varying proportions in sandstones of all mineralogic compositions. Two mechanisms are thought to have been especially important in the development of secondary dissolution porosity in the Surat Basin sandstones: firstly, selective framework-grain and interstitial cement dissolution caused by organic maturation products emanating from intercalated mudrocks prior to the onset of hydrocarbon generation; and secondly, meteoric flushing of the basin consequent upon the inception of its artesian character (i.e., as a geographic component of the Great Artesian Basin) in the Tertiary. -- Diagenetic clay minerals are present in all stratigraphic units, either as individual species or in preferred species associations, and invariably are found to have reduced porosity and permeability. Their effects on reservoir characteristics are a function of the abundance, mineralogy, crystallographic habits, and geometry of distribution of the clay within the reservoir. Some of the clay minerals are fresh-waterand/ or acid-sensitive whereas others are prone to effect a mechanical migration-of-fines problem due to pressure-differential between the formation and the well during drilling, testing and hydrocarbon production. Furthermore, the presence of interstitial clays, whether detrital or authigenic, has drastically increased the proportion of microporosty while at the same time reduced effective (macro- ) porosity - information about which phenomena is crucial for reliable estimation of hydrocarbon reserves. -- The diagenetic clay minerals in the Surat Basin are found to follow certain stratigraphic and geographic trends: the relatively quartzose sandstones contain mainly kaolinite with some minor smectite, illitesmectite and chlorite whereas formations rich in volcanogenic detritus are characterised by smectite, mixed-layer smectite-illite, and minor kaolinite. -- A quantitative study employing multiple regression analysis indicates that the present-day porosity of the Surat Basin sandstones is primarily a function of five variables; in order of decreasing importance they are the diagenetic cement, detrital mineralogy, geologic age, burial depth and depositional environments. The present study also confirmed in a quantitative manner the notion and observations of various workers that: in a retro-arc foreland basin, hydrocarbon reservoirs occur preferentially in the craton-derived mineralogically mature quartzose sandstones; and conversely, petroleum source-rocks preferentially comprise the arc-derived finer-grained lithic/labile volcanogenic rocks that are prone to be 'tight' because of their greater physical and chemical reactivities. A literature survey of the Mesozoic Western Canada Basin indicates a similar pattern of association suggesting that the occurrence of hydrocarbons in retro-arc foreland basins probably follows this general pattern world-wide.

Download or read book Diagenesis of Sandstone written by and published by . This book was released on 1979 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Porosity and Permeability in Permian Sandstones written by and published by . This book was released on 1992 with total page 398 pages. Available in PDF, EPUB and Kindle. Book excerpt: