Journal ArticleDOI
Quantitative fracture study; sanish pool, McKenzie County, North Dakota
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In this paper, it was shown that fracture porosity varies directly as the product of bed thickness times curvature and that fracture permeability varies as the third power of this product, and that the role of the Sanish fracture system is primarily that of a gathering system for many increments of production from the Bakken.Abstract:
The Devonian Sanish pool of the Antelope field has several unusual characteristics which make it almost unique in the Williston basin. Some of these are: (1) high productivity of several wells from a nebulous, ill-defined reservoir; (2) association with the steepest dip in the central part of the basin; (3) very high initial reservoir pressure; and (4) almost complete absence of water production. Analysis of these factors indicates that Sanish productivity is a function of tension fracturing associated with the relatively sharp Antelope structure. Fracture porosity and fracture permeability can be related mathematically to bed thickness and structural curvature (the second derivative of structure). It is found that fracture porosity varies directly as the product of bed thickness times curvature and that fracture permeability varies as the third power of this product. A map of structural curvature in the Sanish pool shows good coincidence between areas of maximum curvature and areas of best productivity. Volumetric considerations show that the quantities of oil being produced cannot be coming from the Sanish zone. It is concluded that the overlying, very petroliferous Bakken Shale is the immediate, as well as the ultimate, source of this oil. The role of the Sanish fracture system is primarily that of a gathering system for many increments of production from the Bakken. The extremely high initial reservoir pressure indicates that the Sanish-Bakken accumulation is in an isolated, completely oil-saturated reservoir and, hence, is independent of structure in the normal sense. Similar accumulations should be present anywhere in the Williston basin where a permeable bed, of limited areal extent, is in direct contact with either of the two Bakken shale beds.read more
Citations
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A Practical Model for Organic Richness from Porosity and Resistivity Logs
TL;DR: The delta log R technique as discussed by the authors employs the overlaying of a properly scaled porosity log (generally the sonic transit time curve) on a resistivity curve (preferably from a deep-reading tool) for identifying and calculating total organic carbon in organic-rich rocks.
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Natural fractures in shale: A review and new observations
TL;DR: In this article, the authors present new core and outcrop data from 18 shale plays that reveal common types of shale fractures and their mineralization, orientation, and size patterns, and identify a need for further work in this field and on the role of natural fractures generally.
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Curvature attributes and their application to 3D interpreted horizons
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Ultrasonic velocity and anisotropy of hydrocarbon source rocks
Lev Vernik,Amos Nur +1 more
TL;DR: In this article, an experimental study of the physical properties of black, kerogen-rich shales, also including maturation analysis, scanning electron microscope (SEM) observations, and physical modeling, revealed fairly peculiar petrophysical parameters.
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Basin Evaluation by Integrated Two-Dimensional Modeling of Heat Transfer, Fluid Flow, Hydrocarbon Generation, and Migration
TL;DR: The basin model discussed in this article describes the physical and chemical phenomena that control the formation of commercial accumulations of hydrocarbons in the moving framework of a subsiding sedimentary basin: heat transfer, compaction and water flow, hydrocarbon generation, and two-phase migration of fluids.
References
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Book
Mechanics and properties of matter
TL;DR: In this article, the authors define and classify vector and scalar quantities, and use scale diagrams to find the magnitude and direction of the resultant of a number of displacements or velocities.
Kidder-Parker architects' and builders' handbook
TL;DR: The late Frank E. Kidder-Parker as mentioned in this paper, C.E., Ph.D., and H.Parker published the KidderParker Architects & Builders Handbook 1950 18th Edition Engineers Contractors with some wear as seen in pictures.