Download or read book Chemostratigraphy of the Austin Chalk and Upper Eagle Ford Shale South Central TX written by Zain Abdi and published by . This book was released on 2014 with total page 49 pages. Available in PDF, EPUB and Kindle. Book excerpt: A single drill core from La Salle, TX was analyzed for its chemical composition and percent concentration of both major and trace elements in order to understand depositional environments and local tectonic activity of the Balcones Fault Zone. The drill core contained the entirety of the Austin Chalk and the upper portion of the Upper Eagle Ford Shale. Samples were taken from 47 boxes at 3 inch intervals which accumulated in a total of 1,680 samples. Each sample was analyzed using a handheld x-ray fluorescence instrument which provided quantitative analysis of the following elements: Al, Ca, Cr, Cu, Fe, K, Mg, Mn, Mo, Ni, P, S, Si, Ti, and V. Furthermore, x-ray diffraction analysis was conducted at every 7 feet of the Austin Chalk and every 4 feet of the Upper Eagle Ford Shale. Calcium values ranged from 5% to 40% with the former values arising from the Upper Eagle Ford Shale and the latter values coming from the Austin Chalk. Sulfur percent composition ranged from 0%-20% and had similar trends as Magnesium which had values from 0.04% to 4.8%. The Austin Chalk contained great values of pyrite, illite, quartz, calcite, and dolomite. Trace element concentrations suggest that the depositional environment had periods of anoxic or euxinic events. Mineralogical and major elemental geochemistry suggests a carbonate rich Austin Chalk and calcareous Eagle Ford Shale.
Download or read book Stratigraphic relations of the Austin Chalk Upper Cretaceous in central Texas written by Mark Allan Miller and published by . This book was released on 1978 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Facies and Diagenesis of the Austin Chalk and Controls on Fracture Intensity written by Susan Davis Hovorka and published by . This book was released on 1998 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Elemental Chemostratigraphy and Depositional Environment Interpretation of the Eagle Ford Shale South Texas written by Travis Wokasch and published by . This book was released on 2014 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Stratigraphy of the Eagle Ford Group upper Cretaceous and Its Source rock Potential in the East Texas Basin written by Milton A. Surles and published by . This book was released on 1987 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Austin Chalk and its petroleum potential south central Texas written by Stephen Thornhill and published by . This book was released on 1982 with total page 322 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Austin Chalk in Its Type Area Stratigraphy and Structure written by Keith Young and published by . This book was released on 1985 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Geochronologic and Chemostratigraphic Record of Cenomanian Turonian Eagle Ford South Texas written by Michael Anthony Nieto and published by . This book was released on 2016 with total page 366 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Eagle Ford Shale of South Texas is an organic-rich, calcareous mudrock succession which was deposited on the Comanche Platform during the earliest Late Cretaceous. Many academic and industry sponsored Eagle Ford studies over the past 10 years have concentrated their efforts on trying to understand the rock fabrics, facies architecture and heterogeneities present in the succession. However, despite heavy economic and academic interest in the system, few studies focus on trying to understand timing and source of the many bentonite ash beds present in the Eagle Ford; which serve as regional chronostratigraphic markers across South Texas. One of the primary goals of the study is the determination of U-Pb age dates in bentonite-rich ash beds from a group of subsurface cores that penetrate the Eagle Ford Formation in Atascosa County, Texas. Absolute age dates provide a chronostratigraphic framework that is used to estimate the depositional timing of variable Eagle Ford facies, as well as define the timing, duration and magnitude of isotopic events in the region. Secondly, age estimates are utilized to determine and calculate Eagle Ford accumulation rates across South Texas. Absolute age dates are incorporated with lithofacies definitions to better 1) understand the cyclic relationship between dominant Eagle Ford lithologies, 2) identify the controls responsible for the cyclic mode of deposition, and 3) determine the lateral continuity of key lithofacies and lithologic units. Lastly, elemental (XRF) data are utilized to describe the subtle paleoceanographic and sediment source conditions that persisted across the entire Eagle Ford section. These findings are integrated with stable carbon ([delta]13C) isotopic data, which allow for the accurate definition of Ocean Anoxic Event 2 (OAE 2) in the study area and provide a basis for regional correlation with previous studies. Recent studies have suggested that anoxic conditions experienced within the Western Interior Seaway during this time were asynchronous with the well-documented global OAE 2 event. The present study compares local U-Pb age dates, isotopic and elemental results with regional studies to better define the onset timing and paleoceanograpic conditions associated with Eagle Ford Shale deposition.
Download or read book The nature of the Austin Chalk Taylor Marl unconformity Upper Cretaceous in Central Texas written by Mark West and published by . This book was released on 1977 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Facies and Stratigraphic Framework of the Eagle Ford Shale in South Texas written by Heather Anne McGarity and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The Upper Cretaceous Eagle Ford Shale, in South and East Texas, consists of organic matter-rich fossiliferous marine shale. It is one of the most actively drilled targets for oil and gas in the United States, due to new technologies in drilling and completions. These low porosity and permeability reservoirs are now significant hydrocarbon producers, and therefore, it is crucial to understand the architectural elements and reservoir properties to maximize hydrocarbon production. Zones of higher clay content, variable lithology, total organic content variations, and changes in porosity and permeability can affect hydrocarbon recovery. This study focuses on building a detailed stratigraphic framework of the Eagle Ford Shale. Six wells with whole core through the Eagle Ford Formation were analyzed and interpreted to determine lithology, sedimentary structures, and parasequences. Eight separate facies along with their depositional environment were interpreted to have been deposited above storm wave base along the inner and outer shelf in a moderate energy environment episodically interrupted by higher energy events, as opposed to a deeper-water setting. Gently inclined lamina and ripple cross laminations provide evidence of significant bedload transport, probably as floccule ripples. Bioturbated horizons mark flooding surfaces that cap upward-coarsening facies successions, interpreted as parasequences. These surfaces, along with bentonites seen in core were then correlated to the corresponding wireline logs. These surfaces along with other distinct gamma ray markers were then correlated across the South Texas region using a dataset of 735 gamma ray logs. Several units show onlap and truncation that were used to document onlap and thinning adjacent to structural highs. The upper Eagle Ford Shale shows onlap and thinning of units towards the San Marcos Arch as opposed to the Maverick Basin region where the upper Eagle Ford Shale thickens significantly. The lower Eagle Ford Shale remains relatively constant throughout the South Texas region, showing only minimal areas of thickened sections. Thus, indicating deposition of this lower unit prior to subsidence of the Maverick Basin.
Download or read book The Stratigraphy and Depositional Environment of the Austin Chalk upper Cretaceous at White Rock Creek Bellmead Texas written by Kolin Beam and published by . This book was released on 2015 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The regional stratigraphy of the Austin chalk central Texas and its relationship to petroleum occurrence and potential in Burleson County written by Charles Michael Brown and published by . This book was released on 1981 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Chemostratigraphy of the Eagle Ford Formation South Texas written by Christopher R. Murley and published by . This book was released on 2014 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Shelf Sedimentation and Depositional Sequence Stratigraphy of the Upper Cretaceous Woodbine Eagle Ford Groups East Texas written by Sandra Phillips and published by . This book was released on 1987 with total page 650 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Geological Circular written by and published by . This book was released on 1998 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The stratigraphy of the Austin chalk Waco 1 250 000 quadrangle central Texas written by Sara L. Bashour and published by . This book was released on 1981 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A regional subsurface study of the Austin Chalk South Texas written by Norma Martinez and published by . This book was released on 1982 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt:
