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Micro-fabric and Strength Studies of Oil Sands

其他書名	Report to AOSTRA on Agreement No. 56, File Number 8869G
出版	University of Alberta, 1980
URL	http://books.google.com.hk/books?id=4tCpSgAACAAJ&hl=&source=gbs_api

註釋Diagenetic alteration has decreased the porosity of oil sand materials and increased their strength and competency. The diagenetic processes of pressure solution and authigenic crystal overgrowth are examined in terms of the environmental conditions related to their occurrence and the grain fabric alterations they produce. The influence of these processes on oil sand materials is demonstrated by reference to scanning electron and optical micrographs of intact samples of the McMurray and Grand Rapids Formations. The grain fabric of a number of comparative materials is examined to aid in delineation of sandstone fabric. Previous investigations of the strength of granular materials are reviewed, together with several models for the strength of granular materials and rocks. The curvilinear failure envelope obtained in oil sand materials is discussed, and a curve-fitting technique for analysis of oil sand strength is examined. Block samples of oil-free McMurray and Grand Rapids Formations were obtained from river valley outcrops in the Fort McMurray area. The specimens were tested in the direct shear apparatus to delineate Mohr-Coulomb failure criteria and dilatent behaviour. In addition, oedometer tests were conducted to determine the compressibility of the materials. Index data were collected to aid analysis of grain fabric. The results of the strength and index tests are examined in terms of the factors which influence the strength of a locked sand. A qualitative classification for the effect of diagenesis on strength is proposed based on the porosity reduction resulting from diagenesis.