About
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Introduction
My name is Randy Blood. I am the founder of DRB Geological Consulting and a Co-founder of Wildlands Research. Most of my work centers on understanding various aspects of fine-grained strata in marine environments. To date, much of my research has focused on the Middle and Upper Devonian shale sequences of the Appalachian Basin. My research includes stratigraphy and correlation, organic and inorganic geochemistry, and thier application to various economic geology issues.
Education
January 2004 - December 2006
August 2001 - May 2003
August 1999 - May 2001
Publications
Publications (37)
Future gas supply totals 3,978 trillion cubic feet in 2022, an increase of 3.6 percent from the comparable year-end estimate in 2020. Technically recoverable resources of natural gas – those in the ground but not yet recovered – total 3,352 trillion cubic feet (Tcf) in 2022, according to the PGC assessment. An independent assessment of proven reser...
The Upper Devonian Point Gratiot Bed in the upper Hanover Shale is equivalent to the Upper Kellwasser Event, which marks the culmination of the Upper Devonian Mass Extinction. X-ray fluorescence data was collected at cm intervals through the bed from numerous lakeshore and creek exposures in western New York State. Molybdenum and uranium enrichment...
The highly productive nature of the Marcellus Shale has led to an interesting observation where individual well estimated ultimate recoveries (EURs) often exceed the calculated gas-in-place (GIP). These observations have led us to question our understanding of GIP, vertical and horizontal drainage, and our understanding of downhole pressure measure...
Fully revised and updated field guide to the 2019 Eastern Section American Association of Petroleum Geologists field trip held in Columbus, Ohio
Determination of ideal horizontal targets for unconventional reservoirs often necessitates an understanding of the reservoir from the global tectonic to the sub-microscopic scale. When selecting a target zone, it is necessary to consider the abundance, composition, and delivery of sediment to basins; the production, preservation, and alteration of...
Limestone “stringers” encountered while drilling horizontal Marcellus wells negatively impact drilling operations by reducing drilling rates, damaging bits, and requiring excessive steering corrections to penetrate or extricate the bit from the horizon. Analysis of cuttings, cores, and well logs reveals that the limestone “stringers” are often carb...
Appalachian Basin “shale gas”, driven by the Devonian Marcellus Shale and Ordovician Utica/Point Pleasant has become a significant component of U.S. natural gas production. While they display similar production mechanisms, the conditions under which these deposits accumulated were markedly different. Vertical chemostratigraphic profiles and pyrite...
Spectral analysis of natural and stimulated gamma rays is a well-established open-hole technology that enables accurate mineral characterization and petrophysical evaluation of conventional and unconventional reservoirs. The determination of detailed mineralogy in the cased-hole environment, however, has been a challenge because of the significantl...
Pyrite framboid diameters were examined in 31 samples taken from 2 Marcellus Shale cores recovered from Greene County, Pennsylvania, and Upshur County, West Virginia (USA). Analysis of framboid diameters in those samples from the more proximally located Upshur County core suggests that anoxic to anoxic-euxinic conditions persisted during accumulati...
Variations in the concentration of redox sensitive elements combined with pyrite framboid size data documented from a Marcellus Formation (Middle Devonian) core recovered from southwestern Pennsylvania elucidate the redox, organic matter accumulation, and diagenetic history of these deposits in this region of the basin. Uranium and Mo enrichment an...
It is common industry knowledge that horizontal shale gas development is enhanced by drilling in the orientation parallel to the local minimum principal horizontal stress such that the induced hydraulic fractures grow parallel to the maximum horizontal stress during completion. Given the incongruous nature of mineral leases in the Marcellus Shale p...
Most shale gas reservoir properties reflect a history of base level fluctuations that can be cast in terms of a predictive sequence stratigraphic famework. Our approach to the sequence stratigraphy of the Devonian gas shale succession of the Appalachian Basin is grounded in the transgressive-regressive (T-R) sequence concept. A single T-R sequence...
The Upper Devonian Rhinestreet black shale of the western New York state region of the Appalachian Basin has experienced multiple episodes of overpressure generation manifested by at least two sets of natural hydraulic fractures. These overpressure events were thermal in origin and induced by the generation of hydrocarbons during the Alleghanian or...
Laterally persistent carbonate concretionary horizons are conspicuous to the Upper Devonian (Frasnian) Rhinestreet black shale of the western New York State Appalachian Plateau. Field observations, including randomly tilted concretions and differential compaction of host sediment laminae around concretions, are consistent with early diagenetic grow...
Most workers attribute the preferred grain orientation that defines the shale fabric to the mechanical collapse of a high-porosity clay microfabric under increasing overburden pressure. Scanning electron microscope analysis of samples of the Upper Devonian (Frasnian) Rhinestreet shale of western New York State collected from near early diagenetic c...
