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Relating Stratigraphy, Lithologic Facies, and 3D Seismic Attributes to Oil Production in Bakken Formation Wells, Red Sky Area, Williston Basin, North Dekota

2015 Geology
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Release : 2015
Genre : Geology
Kind : eBook
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Book Synopsis Relating Stratigraphy, Lithologic Facies, and 3D Seismic Attributes to Oil Production in Bakken Formation Wells, Red Sky Area, Williston Basin, North Dekota by : Corbin William Crews

Download or read book Relating Stratigraphy, Lithologic Facies, and 3D Seismic Attributes to Oil Production in Bakken Formation Wells, Red Sky Area, Williston Basin, North Dekota written by Corbin William Crews. This book was released on 2015. Available in PDF, EPUB and Kindle. Book excerpt: The Bakken Formation is considered the most important hydrocarbon-bearing rock unit in the Williston Basin of North Dakota and is currently one of the most prolific unconventional resource plays in North America with a 2015, basin-wide production of approximately 1.1 million barrels of oil per day. Most production from the Bakken Formation is from wells drilled horizontally and completed using hydraulic fracturing in the relatively thin Bakken formation that varies in thickness from 0 to 160 feet (0 to 49 meters). Studies by previous workers in the Williston basin have identified six, field-scale “sweet spots” characterized by higher production relative to other areas of the Williston Basin. Previous workers have also recognized that significant variation in hydrocarbon production exists even at scales of 1000’s of feet to a few miles between individual wells within these known sweet spots. The objective of this thesis is to understand the causes of these localized, field-scale, production variations and how to best optimize future wells and completions. Unlike previous studies that focused on regional-scale sweet spots, the work presented here focuses on the field level, which is scale for drilling and completion decisions. I present an integrated interpretation of the geology, geophysics, and drilling and completion designs of wells targeting the Bakken Formation in the Red Sky area, Mountrail County, North Dakota, in order to explain localized variations in well productivity using my compilation of historical production statistics. Using a high-quality, time-migrated, 3D seismic survey combined with well logs, core data, well files, seismic attributes, and production statistics, I have identified the productive reservoir unit and its natural fracture patterns over an area of approximately 730 square miles. Using ArcGIS spatial analysis and TIBCO Spotfire analytical software, I present a simple method to quantify variations in historical production statistics and how these variations reflect geologic controls including facies and fracture patterns. Geologically, the most significant control on the “sweet spot” are thick sand bodies of the Middle Bakken Formation deposited in a tidal dominated barrier bar system. Structurally, the most significant control on sweet spots are areas of the least number of natural fractures as mapped using seismic attributes.

An Integration of Sequence Stratigraphic and Petrophysical Analysis in the Bakken Formation, North Dakota

2014 Bakken Formation
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Release : 2014
Genre : Bakken Formation
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Book Synopsis An Integration of Sequence Stratigraphic and Petrophysical Analysis in the Bakken Formation, North Dakota by : Eren Dongel

Download or read book An Integration of Sequence Stratigraphic and Petrophysical Analysis in the Bakken Formation, North Dakota written by Eren Dongel. This book was released on 2014. Available in PDF, EPUB and Kindle. Book excerpt: A decrease in the discovery of reserves in conventional reservoirs has led to a focus on unconventional reservoirs. New techniques, such as hydraulic fracturing, provide better production conditions and allow the development of new reservoirs. The Bakken unconventional play is one of the most important oil plays since it has the largest crude oil accumulation in the United States. During the study, 86 wells with the digitized format (log ASCII standard) were used for depositional environment analysis and petrophysical interpretation of the Bakken Formation in the northwest part of North Dakota. The Bakken Formation is subdivided into six facies which show diversity in thicknesses over the study area. The thicker parts of the Bakken Formation correlate to higher oil production. Petrophysical and elastic properties of the Bakken Formation was examined in terms of their effects on productivity. The best calculation methods for these properties such as water saturation, effective porosity, brittleness, were tested according to the best match of log data calculations and core data results. Log data calculations show a harmonious trend with the core data. It has been questioned as to whether brittleness can, in and of itself, be a key indicator of the productivity of a well. Brittleness, an important factor in hydraulic fracturing, was calculated by using log and mineralogy data. These results were used to estimate how the facies would respond to hydraulic fracturing, and were compared with petrophysical calculations for the determination of possible horizontal targets. High brittle conditions allow the rock to be fractured resulting in a smoother production process. The brittleness analysis shows that an increase in brittleness also results in an increase of productivity. Even though there were some areas with high resistivity and low water saturation conditions, which are key points for oil production, due to unsufficient brittleness, these areas are not ideal for drilling. Therefore, the brittleness has been concluded to be a key factor of how productive a well can and will be.

The Carrington Shale Facies (Mississippian) and Its Relationship to the Scallion Subinterval in Central North Dakota

1979 Geology
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Release : 1979
Genre : Geology
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Book Synopsis The Carrington Shale Facies (Mississippian) and Its Relationship to the Scallion Subinterval in Central North Dakota by : Peter F. Bjorlie

Download or read book The Carrington Shale Facies (Mississippian) and Its Relationship to the Scallion Subinterval in Central North Dakota written by Peter F. Bjorlie. This book was released on 1979. Available in PDF, EPUB and Kindle. Book excerpt:

Stratigraphic reservoir characterization for petroleum geologists, geophysicists, and engineers

2006-11-03 Science
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Release : 2006-11-03
Genre : Science
Kind : eBook
Book Rating : 818/5 ( reviews)

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Book Synopsis Stratigraphic reservoir characterization for petroleum geologists, geophysicists, and engineers by : Roger M. Slatt

Download or read book Stratigraphic reservoir characterization for petroleum geologists, geophysicists, and engineers written by Roger M. Slatt. This book was released on 2006-11-03. Available in PDF, EPUB and Kindle. Book excerpt: Reservoir characterization as a discipline grew out of the recognition that more oil and gas could be extracted from reservoirs if the geology of the reservoir was understood. Prior to that awakening, reservoir development and production were the realm of the petroleum engineer. In fact, geologists of that time would have felt slighted if asked by corporate management to move from an exciting exploration assignment to a more mundane assignment working with an engineer to improve a reservoir’s performance. Slowly, reservoir characterization came into its own as a quantitative, multidisciplinary endeavor requiring a vast array of skills and knowledge sets. Perhaps the biggest attractor to becoming a reservoir geologist was the advent of fast computing, followed by visualization programs and theaters, all of which allow young geoscientists to practice their computing skills in a highly technical work environment. Also, the discipline grew in parallel with the evolution of data integration and the advent of asset teams in the petroleum industry. Finally, reservoir characterization flourished with the quantum improvements that have occurred in geophysical acquisition and processing techniques and that allow geophysicists to image internal reservoir complexities.

Stratigraphic Reservoir Characterization for Petroleum Geologists, Geophysicists, and Engineers

2013-11-21 Technology & Engineering
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Release : 2013-11-21
Genre : Technology & Engineering
Kind : eBook
Book Rating : 704/5 ( reviews)

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Book Synopsis Stratigraphic Reservoir Characterization for Petroleum Geologists, Geophysicists, and Engineers by : Roger M. Slatt

Download or read book Stratigraphic Reservoir Characterization for Petroleum Geologists, Geophysicists, and Engineers written by Roger M. Slatt. This book was released on 2013-11-21. Available in PDF, EPUB and Kindle. Book excerpt: There are many tools and techniques for characterizing oil and gas reservoirs. Seismic-reflection techniques include conventional 2D and 3D seismic, 4D time-lapse seismic, multicomponent seismic, crosswell seismic, seismic inversion, and seismic attribute analysis, all designed to enhance stratigraphy/structure detection, resolution, and characterization. These techniques are constantly being improved. Drilling and coring a well provides the “ground truth” for seismic interpretation. Rock formations are directly sampled by cuttings and by core and indirectly characterized with a variety of conventional and specialized well logs. To maximize characterization and optimize production, many of these tools as possible should be employed. It is often less expensive to utilize a wide variety of tools that directly image or measure reservoir properties at different scales than to drill one or two dry holes.

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