| 1 | Characteristics of Biogenic Silica and Its Effect on Reservoir in Wufeng-Longmaxi Shales,Sichuan Basin显示文摘Further researches of shale petrology indicate that clay minerals are not the dominant mineral in most shale reservoirs.Depending on the reservoir,shales are typically dominated by quartz,calcite,or mixtures of these minerals and the quartz content is usually more than 30%.Besides the detrital quartz,biogenic silica is also an important part of shale reservoir.In order to analyze the genesis of quartz in gas shale and its effect on the reservoir quality。 | ZHAO Jianhua JIN Zhijun JIN Zhenkui WEN Xin GENG Yikai YAN Caina | 2015 | Acta Geologica Sinica(English Edition)2015，89，A01： | 3 |
| 2 | Depositional environment of shale in Wufeng and Longmaxi Formations, Sichuan Basin显示文摘Formation of organic-rich shale was controlled by depositional processes and environment condition.According to petrology,mineralogy,fossil composition and sedimentary structure,seven lithofacies of shale were identified in the Wufeng Formation to Longmaxi Formation,e.g.,siliceous shale,silty shale,argillaceous shale,calcareous shale,shell-bearing argillaceous limestone/calcareous mudstone,siltstonefine sandstone and bentonite.For shale in the Wufeng and Longmaxi Formations,the depositional mode was not only the suspension deposition under the low-energy hydrodynamic condition,but also the biogenic deposition,the storm deposition and the bottom current deposition indicated by large amount of siliceous biological fossils,biological detritus with size graded structure,silt laminations,lenticular bedding,ripple cross-bedding and other sedimentary structures.Trace element analysis suggested that the siliceous shale in theWufeng Formation and the lower part of Longmaxi Formation was developed in the oxygen-dysoxic/anoxic depositional environment,which was rich in organic matters;then due to influence of the sea level gradually decline and bottom current,the silty and argillaceous shales were formed,and the oxygen-dysoxic/anoxic depositional environment was destroyed,gradually leading to the worse preservation condition of organic matter. | Jianhua Zhao Zhijun Jin Zhenkui Jin Xin Wen Yikai Geng Caina Yan Haikuan Nie | 2017 | Petroleum Research2017，2，3： | 2 |
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