34 research outputs found
(Table 2) Chemistry of the organic matter at DSDP Leg 62 Holes
The wide distribution of sapropelic deposits in the sedimentary cover of the oceans, their Cretaceous age, and their possible oil- and gas-generating characteristics allow us to regard these deposits as a regular global stage in the history of oceanic sedimentation. So, Cretaceous sapropelic deposits are a unique object for study.
Cretaceous sapropelic deposits of DSDP Sites 463, 465, and 466, as well as similar sediments of the Atlantic and Indian Oceans, are characterized by enrichment in organic matter, which sometimes reaches 33% (Cape Verde Basin, DSDP Sites 367 and 368).
The objective of this study is the elucidation of genesis, paleogeographic environment of sedimentation, and oil-generating potential of Cretaceous sapropelic deposits at these sites. Attention is given to petrographic composition and distribution of the organic matter
(Table 3) Relative distribution of normal and isoprenoid alkanes in oils of bitumen A from black shales of the Cape Verde Basin in DSDP Hole 41-367
Composition of organic matter from black shales drilled in the Cape Verde Basin in DSDP Hole 41-367
Results of geochemical studies of organic matter in black shales from the Cape Verde Basin are reported. Based on these results, in combination with data of petrographic analysis, conclusions are made about sapropelic nature of their organic matter and low degree of its coalification. It corresponds to the proto-catagenetic substage of sedimentary rocks. Black shales of the Cape Verde Basin are classified as potential oil source strata
(Table 1) Composition of organic matter from black shales collected in DSDP Holes 41-367 and 41-368
(Table 1) Content and composition of bitumen A from organic matter of black shales from the Cape Verde Basin in DSDP Hole 41-367
(Table 2) Group composition of organic matter fro black shales collected in DSDP Holes 41-367 and 41-368
Organic matter from black shales collected in DSDP Holes 41-367 and 41-368
It is shown that microscopic algae dominate in source material of organic matter of black shales, and admixture of residues of organisms and terrestrial humic material is contained. The main direction of source material transformation during syngenesis and sedimentogenesis is associated with jellofication resulting to formation of organic matter of significantly sapropelic type. Low reflectance of vitrinite and alginite from organic matter refer to the primary and secondary lignite stages of its carbonification. Significantly sapropel type of organic matter and low stage of carbonification are reliable criteria for assigning black shales to the category of potential oil source strata