Key Laboratory of Oil Shale and Coexistent Energy Minerals of Jilin Province

Changchun, China

Key Laboratory of Oil Shale and Coexistent Energy Minerals of Jilin Province

Changchun, China
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Ming X.-R.,Jilin University | Liu L.,Jilin University | Liu L.,Key Laboratory of Oil Shale and Coexistent Energy Minerals of Jilin Province | Yu L.,Jilin University | And 6 more authors.
International Journal of Coal Geology | Year: 2017

A large amount of thin-film dawsonite has developed in coal cleats and also in fractures within the roof sandstone in Jurassic CO2-rich coal measure strata of the Yaojie coalfield, Minhe Basin, China. The CO2 in these strata has been in a supercritical state since natural emplacement. In this study, the Yaojie coalfield is considered a natural analogue site for CO2 capture, utilization, and storage (CCUS). The thin-film dawsonite in coal measure strata was analyzed to investigate the evolution of carbon in supercritical CO2 after CCUS, as it provides a possible example of the formation of carbonate minerals from a wet supercritical CO2 fluid. The cleat- and fracture-filling dawsonite takes the form of white or silver-white radial thin-film crystals (generally < 3.2 mm in diameter and < 20 μm in thickness) and appears in a variety of shapes, with the mineral fibers growing divergently within the plane of the film. The thin-film dawsonite within cleats is readily separated from the coal, and its crystal morphology is controlled by the cleat space. The thin-film dawsonite in the roof sandstone does not completely fill fractures, and the morphological characteristics of the surfaces of the mineral crystals indicate that crystal growth was not constrained by the surrounding rock. The sources of the carbon for the cleat-filling dawsonite were magmatic CO2 and CO2 derived from the decomposition of basement marble, which resulted from dynamic–thermal metamorphism of the F19 fault zone. The carbon isotopic compositions of the cleat-filling dawsonite from different carbon sources are transitional, and the carbon source for all of the sandstone fracture-filling dawsonite is the CO2 released from the decomposed basement marble. The morphological and mineralogical characteristics of the thin-film dawsonite show that it most likely nucleated and grew directly in the liquid-like water film formed by wet supercritical CO2 on solid phase surfaces, rather than by epitaxial growth on the rocks surrounding the cleats and fractures, probably via layer-by-layer crystallization. The sodium and aluminum in the dawsonite were derived from formation water. The formation of dawsonite in the coal measure strata of the Yaojie coalfield indicates that some of the free-state CO2, which increases in content due to desorption of the coal matrix, can ultimately be converted into carbonate minerals during CCUS. © 2017 Elsevier B.V.


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.


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.

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