"August, 2001" / Bibliography: leaves 173-183. / xvi, 184, 12 leaves : ill. (some col.), maps, plates (some col.) ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / "The primary objective of the study was to gain a better understanding of the tectonostratigraphic evolutionary history of the Bass Basin. In particular, the study has focussed on mapping and analysing all the faults and fault patterns in the Bass Basin in relation to the subsidence history and its influence on sedimentation and hydrocarbon potential of the basin. The reason why the Durroon area and the Bass area behaved differently in response to extensional stresses was investigated. As a final outcome, it was thought important to clarify some of the existing disagreement about the broad tectonic and structural history of the basin and in particular to separate the influence of the Otway and Tasman Sea rifting episodes on the sedimentation history of the Bass and Durroon area. The study also aimed at investigating the occurence in the basin and nature of a recently recognised fault system, a polygonal fault system." --p. 2. / Thesis (Ph.D.)--University of Adelaide, National Centre for Petroleum Geology and Geophysics, 2002

The Waltersburg sandstone produces oil from isolated sand bodies and has produced nearly eight million barrels of oil from those of the Rochester, Mounts, and Fleener Fields. From the overlying "little Menard" Limestone to the Vienna Limestone below, the Waltersburg interval is most commonly 70 feet thick, but ranges from 14 feet in the north to 116 feet in the south. Increasing interval thickness is strongly correlated with increasing sand percentage. The maximum sand accumulation occurs in elongate sand bodies up to 100 feet thick,one-fourth to one mile wide, and two to five miles long. Elongate sand bodies are commonly oriented northeast-southwest, nearly perpendicular to strike. Sheet sand bodies are less than half as thick and usually produce only from small structural highs.Structure contour maps of the Vienna and "little Msnard" Limestones show that a 16 square mile plunging anticline bearing N30E exists along with other minor folds on a regional slope dipping about 40 feet per mile into the Illinois Basin. The structure of the "little Menard" may be associated with structural features of the Vienna, with isolated thick sand bodies or both where they occur together. Structural features of the "little Menard" that are not seen on the Vienna are usually attributed to differential compaction over sand bodies. The overall similarity in folding of both limestones suggests that deformation occurred after Waltersburg deposition as a result of differential compaction over older sediments combined with regional tilting as sediments subsided into the Illinois Basin.Oil production occurs in sands 10 to 60 feet thick that are structurally high. Structural elevation is therefore more important to production than sand thickness. Since most structural traps have been exploited, the most favorable locations for potential production are where thick elongate sands thin up-dip to form stratigraphic traps. Although a few locations for possible stratigraphic traps exist within the study area, extending exploration in recommended places may lead to more promising production outside the study area.On the basis of petrography, subsurface geometry, and log signatures of the Waltersburg sandstone, the depositional environment is suggested as being a fluvial dominated delta plain facies. The various types of thick elongate sand bodies are attributed to fluvial distributary channels. The interdistributary area is represented by mostly shale and silt, with crevasse-splay sands and possible minor mouth bar/crevasse-splay couplets.

The Elliot Oil Field lies in the northeast corner of Vanderburgh County, Indiana. Elliot Field produces from the Cypress Formation that is a sandstone reservoir.The West Baden Group is the lowermost group of the Chesterian Series of late Mississippian age in the Indiana portion of the Illinois Basin. The West Baden Group encompasses, in descending order: Cypress Formation, Reelsville Limestone, Sample Formation, Beaver Bend Limestone, and Bethel Formation.Within the study area, the West Baden Group was mapped with emphasis on the distribution of the sandstones and clarification and correlation of intervening limestone units. The West Baden has been mapped between the overlying Beech Creek Limestone and the underlying Renault Formation. Both upper and lower contacts of the West Baden appear to be sharp. The maps for this report show: structure on top and bottom of the West Baden, isopach of the West Baden, sandstone thickness and percentage in the West Baden and sandstone thickness in the Bethel, Sample and Cypress Formations.in the study area, the West Baden Group ranges from 180 to 235 feet in thickness. The irregularities in thickness of the West Baden result predominantly from variation in the percentage of sandstone. The regional dip of the West Baden beds is to the southwest at a rate of approximately 45 feet per mile. The top of the West Baden lies 1275 feet below sea level within the northeast portion of the study area.The Reelsville Limestone is absent within the study area and the Beaver Bend Limestone is only present in the northwest portion. The deposition of the Beaver Bend is most likely controlled by development of underlying sandstone of the Bethel Formation and by the amount of compaction. The presence of Beaver Bend in the northwest portion of the study area precludes the concept that only a single clastic cycle is represented during the West Baden interval.Sedimentation of the West Baden interval is dominated by the clastic dispersal system of the ancient Michigan River with a predominantly southwesterly trend. The lateral gradation of sandstone bodies into a marine section is evidence for the deltaic origin of West Baden deposits. The intervening limestone units of the West Baden interval can best be explained by the sporadic transgression and regression of a shallow epicontinental sea.Elliot Field has produced more than 640,000 barrels of oil, mostly within the last 30 years. The trapping mechanism is related to a point-bar sand with an updip permeability barrier provided by fine-grained prechannel deposits.

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The research involves mapping of subsurface at a scale of 1:25,000 the top of three geological formations in the Southern Part of Sumatra – the Airbenakat Formation, the top of the Talangakar Formation, and the top of structural basement in the Jambi Trough. Isopach maps of the formations will be constructed. These maps will form the basis of a basin analysis and hydrocarbon source rock assessment of the Jambi Trough using Basin Mod basin modeling software (Rockworks Software). The studies utilize the L. Bogue Hunt Southeast Asia database housed in the Department of Geological Sciences at Ball State University. Seismic record sections, geophysical logs, cutting descriptions, and paleontological reports will provide basic geological data to enable mapping of the three horizons. Although hydrocarbon accumulations are abundant in Central and Southern Sumatra, the nature of the source rocks is only partially understood. The proposed research will map the Airbenakat and Talangakar Formations while identifying the areas of thermally mature source rock is the main goal of the research. This study will identify characteristics which will enable the identification of thermally mature rocks in other regions of Sumatra. The area of the project is located at the Southeastern part of Asia in Indonesia and mainly the Jambi trough located in Southern Sumatra. Generally, the geology and tectonics of this area (Sumatra) is controlled by the subduction of the Indian plate towards the east and beneath the Eurasia plate. / Department of Geological Sciences

According to the Ade observation (Ade, W., pers. Comm.) “95% of all commercial oil fields in the Sumatra region occur within 17 km of seismically mappable structural grabens in the producing basins”. The Ade observation proposes a link between the subsidence of the source rocks (the Talang Akar Formation) in the grabens and the maturity of the organic material. To test the validity of the Ade observation, subsurface mapping of the region was carried out using geophysical logs. Using the well log information, the basement and the formation tops have been mapped with a special emphasis on Talang Akar and Air Benakat Formations. The isopach maps of these formations show that most of the producing wells on the Sunda shelf are in fact located in and around the major structural basins. Trends in the occurrence of the oil fields have also been observed which are analogous to the orientation of the grabens. Structural mapping of the basins have identified several wrench faults. These are of particular interest as wrench faults provide good structural traps for oil in the Los Angeles and the North Sumatra Basins and may prove to be very important for future exploration in southern Sumatra and northwest Java. In South Sumatra Basin, 77.78% of the potential oil fields are located in the 17 km margin from the grabens. For Sunda/Asri Basins and the Ardjuna Basin, it is 100 and 92 respectively. Identifying the source rocks in this 17 km window will enhance the success rate of oil exploration in the Sundaland Basins. / Department of Geological Sciences

In this paper, I will determine the subsurface structure of the Spencer Consolidated Oil Field occupying Sections 1, 2, 11-15, 22, 26, and 27 of Township 8 South, Range 14 West, Posey County, Indiana (Uniontown 7 1/2" Quadrangle).Oil production in the Spencer Consolidated is from three principal formations. These are, in descending stratigraphic order, the Renault Formation, Aux Vases Sandstone, and Ste. Genevieve Limestone, in which the producing zones are referred to as either McClosky sands or oolitic bodies. Mapping the configuration of the oilbearing rocks and defining the distribution of these rocks will be my main concern.Structure contour maps of these three formations were prepared, as were isopach maps of the base of the lower Renault limestone and the Aux Vases Sandstone. There are insufficient data points defining the Ste. Genevieve.For the possible recovery of new hydrocarbons within the Spencer Consolidated and the exploration of existing traps, electric log correlation sections, both transverse and parallel to the surrounding faults, were made. For reliability and consistency, only those wells with electric logs were used.

ix, 271 leaves : ill. (chiefly col.), maps (col.), photographs (col.) ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library / This thesis analyses in situ stress and overpressure throughout Brunei. The resultant in situ stress and pore pressure data is applied to establish the neotectonic evolution of the Baram Delta province and resolve a variety of current geomechanics issues affecting petroleum exploration and production in the region / http://proxy.library.adelaide.edu.au/login?url= http://library.adelaide.edu.au/cgi-bin/Pwebrecon.cgi?BBID=1097072 / Thesis(PhD)- National Centre for Petroleum Geology and Geophysics, 2003

Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / This thesis analyses in situ stress and overpressure throughout Brunei. The resultant in situ stress and pore pressure data is applied to establish the neotectonic evolution of the Baram Delta province and resolve a variety of current geomechanics issues affecting petroleum exploration and production in the region / http://proxy.library.adelaide.edu.au/login?url= http://library.adelaide.edu.au/cgi-bin/Pwebrecon.cgi?BBID=1097072 / Thesis(PhD) - University of Adelaide, National Centre for Petroleum Geology and Geophysics, 2003