Study On The Super-microscopic Organic Petrology Characteristics Of Riching Organic Matters Shale In South East Paleozoic, Southeast Chongqing Area

With the commercial development of shale gas in the United States,increasingly importance has been attached to the new energy resources based on shale gas by many countries.As the source rocks and reservoirs of the shale gas,the geological theory of the gas shale riching organic matter has been discussed extensively.In recent years,using SEM,EDS analysis,Nitrogen adsorption etc.,combined with the parameters of the rich organic matter of shale,some scientists have done a lot of research and achieved fruitful results.But the study on the origin of silica,the microcosmic pore characteristics,organic petrology in shale riching organic is relatively weak,and the correlation between some parameters is not clear.The author discussed the origin of silica and the relationship between the micropore structure characteristics and the organic geochemistry.The object of this study was two sets of rich organic matter shale in the lower Cambrian Niutitang Formation and the lower Silurian Longmaxi Formation in southeast Chongqing.Through the arrangement of geological data,sample collection,relevant experimental test and result discussion of South East,the geological theory of rich organic matter shale formation has the following understanding.(1)There are rich pore types and pore structure in two sets of rich organic matter shale.The pore type mainly consists of mesoporous,micro-pore and macro-pore.The pore connectivity is poor,and the pore volume of microscopic pores mainly contributes mainly to mesoporous pores.The micropore of two sets of rich organic matter and the specific surface area have a good correlation,the micropore and the specific surface area have only weakly positive correlation,and the micropore is negatively correlated with the specific surface area.(2)The effect of TOC on the development of micro-micropore and the contrast surface area in two sets of rich organic matter shale is similar,TOC in a certain range,the two are positive correlation,when TOC content exceeds the critical value,both show negative correlation;the development of TOC on Micropore and Acer Micropore is not obvious.(3)High organic carbon content is closely related to the richness of biological fossils.The lower Cambrian Niutitang Formation and the lower Silurian Longmaxi Formation Two sets of shale organic carbon content(TOC)high,the TOC generally distributes in,the average value reaches.Common thin films and electron scanning electron microscope show that the two sets of rich organic matter shale contains a large number of biological fossils such as algae and pens.The development and reproduction of organisms contribute significantly to the TOC in shale.(4)The source of silicon in rich organic matter shale was studied.Two sets of rich organic matter shale rich in C,Si,O,Al and other elements,the mineral energy spectrum analysis data show that silicon is mainly derived from biological origin,only in a small number of rich organic matter shale in the presence of hot water,metasomatism or land-based origin of the construction.This is consistent with the results of electron scanning electron microscopy.