科研之友
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摘要
The remaining oil in lacustrine oil shale is one of the main types of shale oils. To aim at the characteristics of the strong heterogeneity of mudstone and shale in the Meso-Cenozoic continental depositional basins of China and to study the effects of inorganic mineral ratios in high organic oil shale on the content of remaining oil, semi-open system pyrolysis experiments were conducted utilizing different ratios of calcite-pelitic sandstone/oil shale samples. And to investigate the contents of remaining hydrocarbons in oil shales of different depositional environments, semi-open system pyrolysis experiments were conducted utilizing freshwater lacustrine oil shale, saline water lacustrine dolomite-bearing mudstone and marine oil shale. The results show that, the increased ratios of calcite-pelitic sandstone/oil shale could promote the yields of oil and evidently enhance the residual oil. The remarkable increasing residual oil and total produced oil may result from (1) the expanded pore space produced by the increased contents of minerals such as feldspar, calcite and dolomite, the corrosion of minerals such as dolomite and gypsum and the condensation of organic matter during thermal pyrolysis, and (2) the decreased pressure of the pyrolysis system because of the decreased organic matter and expanded pore space. The content of residual oil of freshwater lacustrine oil shale is remarkably higher than that of saline water lacustrine dolomite-bearing mudstone and marine oil shale, indicating that the low contents of minerals such as feldspar, calcite and dolomite in the freshwater lacustrine oil shale are disadvantageous for hydrocarbon explusion oil exchange. It could be proposed that the strong heterogeneity of continental oil shale system may be a favorable factor for the enrichment of shale oil under conditions of enormous hydrocarbon generation potential.
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