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- W1596727810 abstract "Due to mutual causal relationships of these phenomena, solution should be based on a coordinated study of the relationships tha t existed between the natural gas, subsurface wate rs, rocks, and the processes of formation of H 2 S. Systematic variations in the regional distribution of H 2 S-bearing gases and gaseous sulfur in the oil-gas basins of the USSR have been investigated largely in subsurface waters; gas pools have been neglected. Studies should be undertaken to produce a map o f the distribution of H 2 S-bearing gases of the Soviet Union. A special study of the hydrochemistry of subsurface waters will disclose the conditions of formation, migration, and concentration of H 2 S in gas. Such studies should determine the quantitative distribution of sulfates and dissolved H 2 S in waters at the edges of oil and gas pools and beyond the pools. The possibilities for clarifying the process of formation of H 2 S are broadened considerably if the study includes not only sulfate reduction that has taken place in the subsurface waters but also the conditions of accumulation of sulfates in them and the processes of sulfatization and desulfatization of the sediments themselves in which the waters are present. Determination should be made of the lithology of the rocks with which pools of H 2 S-bearing gases are related, the nature of the sulfates within them, their position in the section with respect to halogen units, and the distribu tion of calcium sulfates in fr actured carbonate reservoirs. It is interesting to study the secondary epigenetic alterations in rocks related to processes of reduction of sulfates. Data ob tained during study of gas-oil fields shows the variation in content of sulfates, sulfide sulfur, and iron oxides in rocks that occur at the edge and beyond pools. In the Orenburg field, anhydrite is replaced by calcite; this is related to the formation of H 2 S. These phenomena are characterized by a definite dependence on the position of the water-oil contact. All this indicates that the proc ess of secondary formation of H 2 S within pools should be marked by an aureole of secondary alteration of the rocks. The presence in the USSR and in other countries of large fields of H 2 S-bearing gases with a formation temperature of 100°C and more prompts the necessity for experimental study of the non-organic formation of H 2 S. From this point of view the study of the thermostability of oil and of various sulfur-organic compounds becomes important. It has been established that the isotopic composition of H 2 S sulfur does not remain constant along the sedimentary section. Surface springs and shallow ground waters contain H 2 S with lighter sulfur in comparison with that of sulfates of rocks. The H 2 S in gas pools at considerable depths is charact erized by heavier sulfur with values of S-34 close to thos e of the sulfates of rocks ." @default.
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- W1596727810 date "1974-01-01" @default.
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- W1596727810 title "Tasks of Study of the H2S-Bearing Gases of Sedimentary Rocks" @default.
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