Our last meeting for the 2018-2029 season will highlight four graduate students. They each will present the results of their subsurface mapping project course taught by Mr. Finley
STRATIGRAPHIC ANALYSIS AND EVALUATION OF
POTENTIAL REMAINING HYDROCARBONS IN
GREENSBURG FIELD, ST. HELENA PARISH, LA
Cyle Chapman
Abstract
Greensburg Field was discovered in the early 1980’s and was a part of the revived Tuscaloosa trend in south Louisiana. The producing reservoir in this field is located in first sand (LTA) of the Lower Tuscaloosa Formation also known as the first stringer sand. The LTA was deposited in a fluvial distributary channel along the eastern portion of the field and a fluvial-deltaic crevasse splay over the western two-thirds of the field. Overall, Greensburg Field is classified as a stratigraphic accumulation where hydrocarbons are trapped both structurally and stratigraphically within the field. There is no evidence of faulting in Greensburg. A compilation of literature, well logs, core data, production data, and pressure data were analyzed, correlated, and interpreted to better understand the relationship between the stratigraphy and structure throughout this field. Constructions of structure maps were produced to understand structural difference throughout the field. Net sand and net pay maps were produced to determine the producing sands depositional environment and reservoir. With more detailed information and studies, a case for left behind hydrocarbons may be determined.
Biography
Cyle earned his B.S. in Geology from UL in 2017 and is currently pursuing his M.S. in Petroleum Geology from UL. Recently, he was a part of UL’s 2019 Imperial Barrel Award team. Over the course of his educational career at UL, he has had the opportunity to gain industry experience while interning with geologists from both White Knight Resources and Aquila LLC here in Lafayette. He has had the opportunity to work in the San Joaquin Basin, Fort Worth Basin, and the Gulf of Mexico Basin. His current research is focused in the offshore Gippsland Basin where he is investigating fluid migration and subsurface features using 3D seismic.
GEOLOGIC EVALUATION OF THE UPPER CRETACEOUS
LAKE ROSEMOUND FIELD
WEST FELICIANA PARISH, LA
Mary Fearn
Abstract
In the late 1980’s, the potential for high hydrocarbon recovery in the Tuscaloosa Group Trend attracted attention in Louisiana’s West Feliciana Parish. Forty miles north of Baton Rouge is Lake Rosemound Field (LRF), a major Tuscaloosa Group gas field. The most notable trend in LRF is the Lower Tuscaloosa upper stinger sand unit. The productive strata of the Lower Tuscaloosa is often dissected by relatively thin to thick shale layers. In LRF, the shales act as a barrier enhancing but complicating the trapping mechanism and compartmentalizing hydrocarbons in the reservoir. Utilization of IHS Kingdom, along with well control, allowed the opportunity to re-examine and evaluate Lake Rosemound Field’s remaining hydrocarbon potential. A total of 50 wells were evaluated to assess the impact shale layers have on reservoir performance and drainage. Detailed isopach and framework maps; a stratigraphic analysis in well correlations; and assessing wells from neighboring fields provided the data for this interpretation. With the interval of significance defined, the evaluation indicated the hydrocarbons in the Stringer A and B sands were in communication. Pressure depletion production drive indicates the reservoir is isolated and intermittent compartmentalization by shale layers is considered a factor.
Biography
Originally from New Orleans, LA, Mary pursued a B.S. in Geology and Geography at the University of Arkansas. Upon the completion of her undergraduate degree Mary returned to Louisiana to pursue an M.S. degree in petroleum geology at the University of Louisiana at Lafayette (ULL). While attending ULL, she worked as a graduate teaching assistant and was involved in several departmental clubs serving as president of AWG and treasurer of AAPG. Mary’s research interests include sedimentology, petrophysics, subsurface mapping, and sequence stratigraphy. Mary recently defended her thesis work, a petrographic analysis of a TMS conventional core and will graduate in May 2019 to begin her career as a Subsurface Geologist.
COCKFIELD FORMATION RESERVOIR ASSESSMENT
ACROSS THE LITTLE BARNES CREEK FIELD
Garrett Goettel
Abstract
The Eocene Cockfield Formation was mapped across the Little Barnes Creek Field of eastern Beauregard Parish, Louisiana to assess remaining productive potential in the Cockfield 9 reservoir unit. Available well and paleontological data was used to map faults, structural horizons and the reservoir volume across the field. Framework mapping suggests a deltaic distributary channel environment in which faulting influences the formation of downthrown distributary channels. A potential untested structure was also identified through framework mapping. Available production data was used to assess the field’s production and development history. The Little Barnes Creek Field produced 640,185 bbl of oil and 862,699 boe of gas from October 1981 until January 1992. Petrophysical properties defined by well logs were used to assess original hydrocarbons in place and estimated recoverable reserves. An estimated 1.58 mmbo and 2.88 mmboe is recoverable at Little Barnes Creek Field.
Biography
Garrett M. Goettel was born in Colorado Springs, Colorado and grew up in Pueblo West Colorado. Garrett attended Western State Colorado University and graduated with a Bachelor’s of Science in Geology in May of 2017. Garrett completed a summer internship with Antero Resources Corporation before moving to Lafayette, Louisiana where he earned a Master’s of Science in Geology from the University of Louisiana at Lafayette in the summer of 2019. Garrett’s geological interests include well log petrophysics, subsurface mapping and seismic interpretation. Personal interests include architecture, travel, and current events.
LOCKFART CROSSING FIELD
LIVINGSTON PARISH, LA
Ross Ledoux
Abstract
Lockhart Crossing field was originally a south Louisiana Tuscaloosa trend discovery in 1979. Development began for shallower hydrocarbon shows in the upper Wilcox in 1982. The structure of the field consists of a doubly plunging rollover anticline on the downthrown side of a master growth fault, part of the regional trend of growth faults across south Louisiana. The upper Wilcox group consists of five (5) upper Wilcox sands, four (4) are hydrocarbon bearing, at depths ranging from 10,000’ – 10,500’ MD. The first sand, Wilcox 1, at the top of the Wilcox group is the primary field reservoir. Identified as a nearshore marine deposit from conventional core data the Wilcox 1 is believed to be laterally extent in the region. An incising channel complex eroded through the littoral facies in the central part of the field. The channel fill and littoral facies are assumed to be in communication to form the Wilcox 1 reservoir. Well correlations and analysis aided understanding the relationship between stratigraphy and structure, and the affect this had on delineating the reservoir. Top and base porosity maps of the Wilcox 1 were integrated with the net sand isochore maps of both the beach ridges and channel lithologies to improve the accuracy of the structure maps. When mapping the reservoir, a tilted oil-water contact was identified and a spill point for the reservoir located at the west end of the master growth fault.
Biography
Ross earned a B.S. in Geology from the University of Louisiana at Lafayette in 2017 and is currently completing his M.S. in Geology from the University of Louisiana at Lafayette. He has held internships with White Knight Resources and Aquila LLC, both of whom are private, independent oil and gas companies headquartered in Lafayette Louisiana. He has experience in a variety of different geologic basins including the San Joaquin Basin in California, Gulf of Mexico Basin and the Maverick Basin in Texas. This summer Ross will be interning at Chevron in their Gulf of Mexico Business Unit in Covington, Louisiana
