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Liu R.,Jilin University | Liu R.,Key Laboratory of Oil Shale and Coexistent Energy Minerals of Jilin Province | Liu Z.,Jilin University | Liu Z.,Key Laboratory of Oil Shale and Coexistent Energy Minerals of Jilin Province | And 4 more authors.
Russian Journal of Pacific Geology | Year: 2015

As a case study, the Meihe Basin, a typical Cenozoic faulted basin, was divided into and identified as five three-order sequences by utilizing core, well logging, and seismic data, as well as palaeontological and geochemical data. Field measurements of sections, core observations, and a comprehensive analysis revealed that the basin is mainly composed of deposits of alluvial fan, fan delta, lacustrine facies, and gravity flows, and oil shale is mainly developed in semi-deep and deep lacustrine environments. The comprehensive study of the sediment-sequence stratigraphy indicates that Sequence I was formed in the initial rifting stage of the basin, dominated by coarse clastic sediments of alluvial fan and fan delta. Sequence II was formed in the rifting expansion stage of the basin, with more developed sediments of fan delta and lacustrine. Sequence III was formed in the largest expansion stage of the basin, dominated by mudstone of deep lacustrine facies and gravity flow deposits. Sequence IV was formed in the shrinking stage of the basin, dominated by sediments of delta and lacustrine fan. Oil shale are mainly developed in the transgressive system tract (TST) and highstand system tract (HST) of Sequence III (Mudstone Member of lacustrine facies). The lake flooding effect of TST can reduce the decomposition amount of organic matter, increase in organic matter production, and reduce the amount of dilution, thus forming oil shale with a thin consistency but high quality. In the period of the HST, the larger accommodation space and excellent organic matter preservation conditions are conducive to developing stable oil shale with a greater consistency. During the high water level period, however, due to the oxygen brought in by turbidites, the decomposition of organic matter is often increased, resulting in the formation of low-quality oil shale. © 2015, Pleiades Publishing, Ltd. Source


Liu R.,Jilin University | Liu R.,Key Laboratory of Oil Shale and Coexistent Energy Minerals of Jilin Province | Liu Z.,Jilin University | Liu Z.,Key Laboratory of Oil Shale and Coexistent Energy Minerals of Jilin Province | And 3 more authors.
Oil Shale | Year: 2015

The Yin’e Basin is an important oil shale-bearing deposit in the Bagemaode area of Inner Mongolia province, Northern China. Oil shale developed in the Bayingebi Formation of the Mesozoic Lower Cretaceous belongs to mudstone shales. In addition to rich organic matter, it also contains detrital minerals like quartz and feldspars, as well as clay minerals like kaolinite, andreattite and illite, with an average content of 45% (detrital minerals) and 37% (clay minerals). Analysis of mineral abundances in oil shale showed that the contents of SiO2 and Al2O3 were relatively high, the respective averages being 46.99% and 13.67%. The oil shale is rich in metal elements such as Sr, Cs, Zn, Rb, Pb and Co, as well as rare earth elements. The highest oil yield of the oil shale in the research area is up to 15.3%, with an average of 4.72%; its average ash content is 77.38% and average calorific value 3.82 MJ/Kg. Based on the above figures, the oil shale can be regarded as a rock with low-medium oil yield, high ash content and low calorific value. Resource evaluation showed that the proved reserves of Bagemaode oil shale are 3.976 billion tons, which are generally considered a rich resource and are characterized by a shallow burial depth. In view of the above different characteristics of oil shale and in consideration of environmental and economic factors, this paper proposes that a multiple-approach and multiple-combination comprehensive development and utilization of Bagemaode oil shale through retorting–power generation–production of metals, silica and building materials should be achieved. © 2015 Estonian Academy Publishers. Source

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