Download or read book Stratigraphic and Structural Analysis of Middle Atoka Formation in Aetna Gas Field Franklin Johnson and Logan Counties Arkansas written by Ikramuddin Bahram and published by . This book was released on 2015 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt: Arkoma basin is a prolific natural gas basin. The defining feature of this basin is the Atoka Formation that was deposited in the early-middle Pennsylvanian. The Atoka is held equivalent to the tectonic and structural evolution of the basin. This study focuses on one of the many gas fields in the Arkoma Basin in Arkansas to assess the stratigraphic and structural evolution that the strata in this particular field display. Aetna Gas Field extends from T. 8N. R. 27 W to T. 9 N, R. 27 W and T. 8 N, R. 26 W to 8N, R. 27. Geographically, Aetna field covers parts of Franklin, Johnson and Logan counties. It is one of the pioneer gas fields in the Arkoma Basin. First discovery of gas in Aetna Field was made in March 1928. The first three producing wells were completed in the upper Carpenter and middle Alma sands of the middle Atoka Formation. An analysis of structures and stratigraphy of the gas field through well log correlations reveal a combination trap for the gas. Using IHS Petra, stratigraphic correlations were performed on 49 wells in 10 cross sections. The wells selected were sorted by several criteria. Gamma ray logs were given priority. Stratigraphic tops were determined for correlation purposes. The stratigraphic tops were picked and correlated. The middle Atoka Formation was addressed exclusively for the purpose of this study. Structural analysis indicates an arch-and-trough setting that led to gas accumulation in this field. The stratigraphic analysis confirms a thickening to the south following the general southern thickening trend of Atoka Formation in the Arkoma Basin.

Download or read book Petrographic and Stratigraphic Analysis of the Atoka Formation Northern Franklin and Northwestern Johnson Counties Arkansas written by Mark A. Wallinga and published by . This book was released on 1986 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Stratigraphic and Structural Evolution of the Ouachita Mountains and Arkoma Basin Southeastern Oklahoma and West central Arkansas written by and published by . This book was released on 2005 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Subsurface Stratigraphic Study of the Middle Atoka Sebastian County Arkansas written by Sara Beth Sutton and published by . This book was released on 2012 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt: Raster log images were analyzed to study the subsurface stratigraphy of the Middle Atoka in the Arkoma Basin of the western portion (Sebastian County) of Arkansas. The most significant sandstone units of the Middle Atoka in this area were determined to be two generally coarsening-upward sequences in the lower portion of the formation. Based on lithologic correlations, these two units were determined to be the informally named Casey and Freiburg members of the Middle Atoka. Thickness information based on picked tops was used to create isopach maps of the units of interest. The log signatures and geometry of the sand bodies indicate that they were deposited in a deltaic system that prograded across this portion of this basin. Distributary-mouth bar deposits dominate the Casey member, and are occasionally overlain by localized channel deposits. Avulsion of the delta lobe possibly occurred, and a new lobe then began to prograde, depositing the sediments that formed the Freiburg. This unit is also dominated by distributary-mouth bar deposits.

Download or read book Stratigraphy and Depositional Environment of the Middle Atoka Formation Central Arkoma Basin Western Arkansas written by Yueyang Wang and published by . This book was released on 2016 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wire line logs are widely used in analysis of the subsurface stratigraphy of the middle Atoka Formation, Central Arkoma Basin, Western Arkansas. SP log, Gamma ray log, resistivity log and conductivity log provide valuable information to construct cross sections. The middle Atoka formation is composed of a succession of shale and sandstone alternations with thickness reaching approximately 3000 feet in the study area. It contains several sandstone units which include Morris, Tackett, Areci, Bynum, Casey and Dunn "A" separated by shale intervals. The purpose of this study is to identify these units and predict sequence stratigraphy and depositional environment by constructing cross-sections, observing wireline logs and associating previous research. Several isopach maps are made, explaining the development of sandstone in target units such as Tackett and Casey. The sequence stratigraphy of the middle Atoka formation is mainly composed of transgressive systems tracts and part of a highstands systems tract. The intervals indicate successive sea-level cycles associated transgression and regression from shallow marine to shoreface. The middle Atoka formation has been proved as a significant exploration target since 1950's. In order to understand geologic setting and find potential reservoirs within the Arkoma basin, it is vital to comprehend the sequence development and depositional environment of the intervals within the middle Atoka.

Download or read book Stratigraphic and Structural Studies in the Ouachita Mountains Oklahoma and Arkansas written by Peter Misch and published by . This book was released on 1956 with total page 374 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Stratigraphic Framework and Sequence Stratigraphy of the Tackett Interval Middle Atoka Formation Arkoma Basin Arkansas written by Erica Beatriz Cortez and published by . This book was released on 2004 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Subsurface Stratigraphy and Structure Related to Petroleum Occurrences in the Middle Atoka Formation Arkoma Basin written by Glen D. Fritsche 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 Initial Structural Subsidence as Reflected in Morrowan and Atokan Pennsylvanian Subsurface Stratigraphy Northern Arkoma Basin North Central Arkansas written by Fatimah Taher Nahi Al Asadi and published by . This book was released on 2016 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Arkoma Basin is a carboniferous foreland basin that is known for its prolific gas production. The objective of this research is to study the initial subsidence of the basin by analyzing the strati-graphic and structural features of the study area. This was accomplished through IHS Petra, Surf-er 13, and Win-Tensor software. Field work studies comprised a large part of this study. Also, a seismic profile and Google earth elevation profiles are among the methods used to study the initial subsidence of the Arkoma Basin. The study area within the basin represents a transitional zone from the shelf into the northern portion of the basin. The defining formations in this project are of Morrowan and Atokan age. Within the vicinity of the Arkoma Basin in north-central Arkansas, the stratigraphic analysis confirms a continuous thickening of the Middle Atoka interval south of the study area toward the Ouachita thrust belt, determined through utilizing raster well logs. Furthermore, system tracts were defined for each formation in this study, giving a general overview of the change in sea-level associated with the process of subsidence of the basin. Structural analysis presents distinctive features that dominated the study area. Both the Mulberry and Clarksville master faults are east-west trending normal faults. These master faults are considered to be growth syn-depositional faults, which are the main evidence for tectonic sub-sidence of the basin. Additionally, the area shows a graben feature named Bullfrog Graben that is considered significant evidence for the local flexure loading of the Arkoma basin.

Download or read book Stratigraphic Relationships Between Shelf and Deep Water Deposits in the Upper Middle Atoka Formation Arkoma Basin Arkansas written by Jacqueline Lee Keizer-Myers and published by . This book was released on 2004 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Guidebook to the Atoka Formation in Arkansas written by William V. Bush and published by . This book was released on 1978 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Structure and Stratigraphy of a Complex Anticlinal Feature Backbone Anticline Arkoma Basin Arkansas written by Shailyn Marie Abbott and published by . This book was released on 2014 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Arkoma Basin of Arkansas and Oklahoma formed in the Ouachita foreland during the late Mississippian and Pennsylvanian periods (about 290- to 330 million years ago). The basin developed in response to convergent tectonic boundaries that closed obliquely from west to east associated with Ouachita orogenic event. The Backbone anticline in the northern Arkoma Basin is a prominent product of this convergence, and represents the first major component of this study. The structure is asymmetric with beds on the southern limb dipping steeply to the south. It is also expressed topographically as a prominent ridge that trends eastward from the Oklahoma-Arkansas border approximately 30 miles. The ridge is bounded on the northern side by a steeply dipping normal fault with most of the sedimentary exposure occupying a position on the southern hanging wall of the structure. Strata involved in the structure are sandstone and shale units from the middle and upper part of the Atoka Formation. A recent road cut in southern Sebastian County, Arkansas exposes a complete and continuous section of more than 600 feet in thickness through an upper Atoka sandstone unit along the Backbone anticline. A subsurface stratigraphic study of the middle of the Backbone anticline was also conducted. Several normal and some reverse faults were noted from cross-sections of the subsurface using IHS PETRARTM software program. The upper 5400 feet of the Atoka Formation includes intervals from the middle and upper part of the formation. This interval extending from the Casey Sand to the Upper Alma Formation was examined by means of three cross-sections prepared from wire line logs to determine the role of faulting in the sedimentary section

Download or read book Structural Cross Sections and Subsurface Maps of the Atoka Formation in the Northern Arkoma Basin Western and Northwestern Arkansas written by David Lewis Nance and published by . This book was released on 2018 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Arkoma Basin is one of several peripheral foreland basins situated on the front of the Ouachita orogenic fold and thrust belt. The transition from the foredeep to the Ozark Plateaus is a short one in terms of latitude. The Atoka Formation in Arkansas comprises the bulk of the sediments in the Arkoma Basin. Three divisions of the Atoka Formation have been informally assigned as the Upper, Middle, and Lower based on differences in sedimentary response to tectonic processes that occurred during the formation and subsidence of the Arkoma Basin. In the Arkansas portion of the Arkoma Basin, the lower Atoka marks the onset of tectonic subsidence in between the Mulberry and the Cass Fault systems and displays a maximum of almost 1,000 feet of thickening in the study area. The middle Atoka in the same area gains a maximum of 4,000 feet of sediment. The upper Atoka achieves a maximum thickness of 1,800 feet. Entrapment of hydrocarbons within the Atoka Formation in the Arkoma Basin has led many oil and gas companies to penetrate and log the formation with electric, gamma ray and other mechanical logs while exploring for natural gas. This study uses these raster logs to provide a variety of maps and cross sections that illustrate the coastal systems of the lower and upper Atoka Formation and aid in the interpretation of the sedimentary response of the three Atoka divisions with respect to structural timing and sedimentology. With the subsurface maps and cross sections, a more synthesized version of the Atoka Formation in the northern Arkoma Basin of western version is produced.

Download or read book Subsurface Stratigraphic Interpretation of the Lower Atoka Formation Northern Arkoma Basin Arkansas written by William Stephen Denham and published by . This book was released on 2018 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Arkoma Basin is a Carboniferous peripheral foreland basin creating a structural depression covering an approximate area of 33,800 miles2 that extends through east-central Oklahoma and west-central Arkansas. The entire basin fill includes Pre-Mississippian carbonate shelf deposits, Mississippian marine carbonates and black shales, and Pennsylvanian mixed carbonated/clastic and shore zone/deltaic deposits. The Lower Atoka formation (Pennsylvanian) occurs in outcrop along the southern Boston Mountain Plateau in northern Arkansas and extends into the subsurface of the Arkoma Basin over an area of 2,300 miles2. The Lower Atoka ranges from 600 to 1500 feet in thickness and represents a cyclic succession of stacked shelf to shore zone/deltaic deposits recording a single 3rd order (1-10 m.y.) Vail/Exxon depositional sequence. It was deposited across a broad, tectonically stable platform along the southern margin of Laurasia just before its collision with the Gondwana and the formation of Pangea at the end of the Paleozoic. Tectonic influences meant that it was not a 100% stable platform during the Lower Atoka deposition. This affected the deposition of all the sequences in the Lower Atoka. Topographic relief on preceding deposition also helped create areas of accommodation space filled by offset, compensation bedding. Finally, subsidence on a passive margin has been argued to be up to almost 4 km. This helps explain the "long distance" shoreline shifts and cyclicity in the current time of deposition. This means that these 4th to 5th order cycles (10's to 100's k.y.) may reflect glacio eustacy and sediment supply and can be correlated across the entire area or a very large area. In addition, there appears to be a tectonic over print that influences onlap edges that define northern limits and areas of bypass and nondeposition.

Download or read book Sequence Stratigraphy and Depositional Dynamics Basal Atoka Formation Orr Patterson Members Middle Pennsylvanian Arkoma Basin Central Arkansas written by Jamie Ann Woolsey and published by . This book was released on 2007 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Diagenesis and Reservoir Characterization of the Pennsylvanian Middle Atoka Formation Sebastian and Logan Counties West Central Arkansas written by Elvis Chekwube Bello and published by . This book was released on 2012 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Middle Atoka Formation evolved from a stable passive margin during the early Pennsylvanian time to a rapidly subsiding basin, with the sedimentary fill thickening greatly southward during the middle Pennsylvanian time. The basin dips in north-south direction. An east-west anticlines and synclines were observed. The purpose of this study is to establish the stratigraphic units, reservoir geometry and distribution, and infer the depositional environments and reservoir quality. Well correlation and petrographic studies are used to achieve the goals. Sandstone Point Count method was used. The Point Counts was divided into five categories. They include the framework grains (quartz, feldspar, and lithic fragments), accessory minerals (muscovite and biotite), cementing materials (quartz overgrowths, feldspar overgrowths, dolomite, and calcite cements), pore-spaces (primary and secondary), and the "Other" (minerals that cannot be identified under the microscope, and matrix and pyrite). Vertical sequences of sand bodies that are closely spaced and separated by thick marine shale intervals, and sandstones that blocky signatures and abrupt bases and tops, were correlated as genetically related sand bodies. Four stratigraphic units; Borum, Turner, Nichol, and Basham Sandstone Units were identified. The sandstones of the Middle Atoka Formation are composed of very fine silt to coarse quartzarenites, subarkoses, sublitharenites, and litharenites. The reservoirs are heterogeneous and were divided into two: the amalgamated reservoirs (proximal and medial submarine fans), and the overbank reservoirs (levee-overbank deposits, crevasse splays, and distal lobes). The geometries of the reservoirs are elongate and radial depending on the stratigraphic units. Quartz overgrowths and clay cements are intense and advanced and variable within the two reservoirs. Porosity loss was significantly caused by compaction and quartz cementation. Secondary porosity, where it occurs, resulted from the dissolution of the labile grains, probably from the interaction with migrating organic acids or as a result of the increasing geothermal gradient. Diagenetic processes either enhance the porosity by dissolving mineral grains, or reducing the porosity by stimulating growth of clay and quartz minerals. Amalgamated reservoirs contain higher amount of dissolution, clay cements, and lower quartz overgrowths. Dissolutions are filled with clay cements. Dissolution when present in overbank reservoirs are better preserved than is in amalgamated portions. Dissolutions and clay cements are also higher in the south than is in the northern part. Higher clay content in the south ensures that the dissolution is almost effectively occluded by clay cements. Consequently there seem to be no net-gain in porosity despite in the area.

Download or read book Sequence Stratigraphy and Depositional Systems of the Mansfield Sand Upper Atoka Formation Arkoma Basin Arkansas written by Scott Aubrey Cherry and published by . This book was released on 2012 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Mansfield sand is an informally named member of the Pennsylvanian Atoka Formation in Arkansas. Once a productive gas reservoir, the Mansfield is situated in a double plunging anticline in the southern portion of the Arkoma Basin. The formation is internally composed of sandstone units ranging in thickness from tens of feet to over a hundred feet interbedded with shale units ranging in thickness from several tens of feet to hundreds of feet. Previous studies have focused on the stratigraphy of the lower and middle Atoka. A detailed subsurface study of the stratigraphic framework of the Mansfield sand was conducted using conventional lithostratigraphy and sequence stratigraphy. Four progradational parasequences have been identified within a highstand systems tract. Deposition of the Mansfield occurred in a deltaic environment on a sandy, fluvial or wave dominated shoreline.