Characterization and Analysis of Devonian Shales as Related to Release of Gaseous Hydrocarbons: Well A-1 McKean County, Pennsylvania

摘要

Shale samples from Allegany County, Pennsylvania (A-2) were analyzed and characterized with the objective of determining the relationships between the gas contents and shale characteristics. A total of 73 core samples were taken from this well (24 for Battelle and 49 for other DOE contractors). The A-2 well is characterized by its wide range of carbon (1.4 to 14.8%) and sulfur contents (0.2 to 8.0%). Mean value of hydrocarbon gas contents in these shales was found to be 0 to 30 v/v, with 0.24 and 0.35 lower and upper limits, respectively. No discernable relationship is found in the gas contents with shale depth. A-2 shales also appear to have very high surface areas (mean value of 9.22 m exp 2 /g) with bulk densities comparable to those from other locations. Helium permeabilities of samples measured were higher than those from other locations. Lithology of these shales did not differ greatly from shales of other locations. (ERA citation 05:011253)