Digital Geophysical Log Analysis – Goolsby Brothers and Associates owns license to and uses the Petcom Log Analysis Software system for digital log analysis for various clients. Several petrophysical projects have been completed or are on-going for Amoco Production Company. These projects involve data verification and analyst of digital geophysical log databases in the San Juan Basin, New Mexico, Anadarko Basin in Oklahoma, and DJ Basin in Colorado. The projects often involve several hundred wells containing multiple stacked pay formations. Neural-net processing models are often constructed and applied as part of these studies. Goolsby Brothers and Associates has also completed or is working on large petrophysical projects for other clients, including projects of more than one hundred wells in several Rocky Mountain areas and in Algeria.

Evaluation of the Undiscovered Oil and Gas Resources on the New Denver, Colorado, Airport Site - A contract with the City and County of Denver to evaluate the economic potential of the undeveloped oil and gas resources on the site of the new city airport. More than 600 wells were studied in the area to delineate the oil and gas reserves remaining on the site. Petrophysical techniques included core description, thin section petrography, SEM work, x-ray diffraction analysis, core measured rock property to geophysical log integration, and geophysical log analysis. Geological appraisal involved the delineation of depositional environments, subsurface fluid pressure mapping, lithofacies mapping, net pay mapping, seismic integration, oil and gas reserve calculation, and assessment of geological chance-of-success (risk). Trial preparation, cross examination consultation, and expert testimony in court finalized the project.

Unitization Evaluation and Due Diligence - Appraise the secondary recovery potential for and volumetric ownership percentage of several unitization and gas storage projects and for various clients. These projects involve digital geophysical log analysis, detailed computer mapping of geological and log derived volumetric parameters, determination of participation formulas, computer aided tract-by-tract determination of reservoir volumetric, and unit ownership percentage calculations.

Cretaceous Study of the Cottonwood Creek Area, Eastern Big Horn Basin, Washakie County, Wyoming - A geological and petrophysical study of the Cretaceous Frontier and Muddy sandstones in the Cottonwood Creek Field area. Five producing zones were examined in more than six hundred wells. Primary objectives of the study were to establish hydrocarbon pay recognition criteria in the zones, determine pore system rock types, identify by-passed pay behind pipe, and recommend field development opportunities. Study objectives were complicated by fresh to brackish formation waters, abundant highly conductive digenetic clays and zeolites, and complex reservoir pore systems developed in litharenites comprised of up to 70% volcanic and polymorphic quartz grains. Lithotype identification was accomplished through the integration of geophysical log analysis, rock property measurements, and depositional facies identification. Petrophysical techniques included detailed core and well cuttings descriptions, thin-section petrography, scanning electron microscope (SEM) studies, x-ray diffraction measurements, core rock property to geophysical log integration, and geophysical log analysis.

Oil and Gas Potential of Paleozoic Reservoirs in the Northern Denver Basin, Colorado, Nebraska, and Wyoming - An integrated seismic, geological, and petrophysical study for hydrocarbon exploration and exploitation in several carbonate and clastic reservoirs in the northern Denver Basin. The project incorporates seismic interpretation, core description, petrographic examination (SEM, EDX, thin-section, and visual examinations), geophysical log analysis, subsurface pressure studies, and regional geological mapping to locate opportunities in these reservoirs.

Tight Gas Sandstone and Coalbed Methane Potential of the Jicarilla Acreage Block, San Juan Basin, New Mexico - An economic assessment of the natural gas potential from coalbeds and tight sandstones in several formations on a large acreage block.

Coal Mine Site Evaluation - Several detailed geological coal property evaluations for resource appraisal and hydrological characterization. Recent studies include a mine permit study in the La Plata area of southwest Colorado and a hydrological and coal resource appraisal of the Gillette area, Powder River Basin, Wyoming.

 Subsurface Fluid Pressure Study of the Horse Gulch Field Area, Piceance Creek Basin, Colorado - The use of pressure/depth plots and hydrodynamic mapping to interpret reservoir distribution in a structurally complex area.

Tight Gas Formation Appraisal in the Piceance Creek Basin, Colorado - As a subcontractor of Gustavson Associates, geological and petrophysical studies were completed to support applications for FERC "Tight Formation" designation on several gas sandstone reservoirs in the Piceance Creek Basin. Project objectives were accomplished using core data, detailed log analysis, and production mapping.

Formation Damage Evaluation of Producing Reservoirs - Petrographic studies on bit cuttings and core samples using SEM examination, thin-section petrography, EDX methods, and x-ray diffraction techniques to determine the causes of formation damage in several producing reservoir settings. These studies were conducted in a number of fields for several clients, including Amoco Production Company, and have resulted in notable cost savings or significant reserve additions. Although the majority of the studies were in tight sandstone reservoirs, a broad spectrum of damageable sandstone and carbonate reservoir pore systems have been appraised.

Instructor, Pore-throat and Hydrodynamic Trapping Core Workshop - A core workshop contrasting pore-throat and hydrodynamic trapping mechanisms taught as an "in-house" course at Amoco Production Company and publicly through the Rocky Mountain Association of Geologists.

Use of "Rock-typing" to Characterize Carbonate Reservoir Heterogeneity - United States Department of Energy Contract DE-RA22-91BC14655 examining the Ordovician Red River Formation in the Williston Basin of Montana. Primary objective of the study is to scrutinize the effects of microlithotype variation on hydrocarbon producibility in carbonate rocks. Goolsby Brothers and Associates, Inc., is providing detailed core description, identification of depositional environments, core rock property to geophysical log integration, geophysical log analysis, and supervision of all geological aspects of the study.

Exploration for Mississippian Mission Canyon Carbonate "Buried Hills", Williston Basin, North Dakota - Supervision of an exploration play initiated by Goolsby Brothers and Associates, Inc., attempting to extend Canadian producing trends into the United States. Accumulations in these trends occur in paleotopographic and two-stage salt collapse structures. The project involves regional geological studies, lease acquisition, reservoir petrophysics, surface geochemical techniques, seismic stratigraphy, and drilling.

 Horizontal Drilling Potential of the Bakken Formation, Williston Basin, Montana and North Dakota - A basinwide geologic appraisal of the potential for oil and gas horizontal drilling in an overpressured mature source rock. The 38,000 square mile area was mapped to delineate thermal maturity and stratigraphic distribution of the reservoir. Producing areas were examined in detail to delineate stratigraphic and structural controls on production. The study resulted in a 500,000+ acre leasing program and an ongoing exploration play.

Exploration for Hydrodynamically Tilted Oil Accumulations in the Permian Kaibab Limestone, Southern Utah and Northern Arizona - An exploration project for large hydrodynamically controlled accumulations in carbonate reservoirs. The study involved a structurally complex 2600 square mile area with extreme variations in subsurface reservoir conditions. Exploration was accomplished through the integration of petrographic research, petrophysical analysis, subsurface pressure investigations, and regional geological studies.

 Geological Wellsite Supervision - Supervision of drilling oil and gas wells in a diverse array of reservoir settings in the western United States. Duties often encompass management of the drilling operations as well as geological interpretation. Reservoir appraisal, hydrocarbon show assessment, recommendation and interpretation of drillstem tests, and geophysical log quality control and interpretation are used to recommend either completion or abandonment of the well being supervised.

Coal geologist performing field mapping of deposits in central Utah and field supervision of coal coring operations in the Powder River Basin.