Abstract
As a key factor restricting the fracturing effect of shale reservoir, the origin and content of quartz components have always been the focus of academic and industrial circles. Due to the great influence of diagenesis process, the accuracy of trace element determination to identify the origin of quartz is not good, which can not meet the increasingly accurate research requirements. In this paper, mineral quantitative analysis technology (QemScan) is used to identify quartz components by two-dimensional quantitative scanning, and the content data of quartz components with different grain sizes are extracted. The results show that the size of quartz particles is obviously controlled by the difference of sedimentary water and sedimentary environment, that is, quartz particles less than 30 μm are mainly concentrated in Long112 and Long114 layers, which is the normal oxygen environment under the background of medium retention in deep water environment; quartz particles larger than 20 μm are mainly concentrated in Long111 and Long113 layers, which is the poor oxygen environment under the background of strong retention in deep water environment. In shallow water environment, the stronger hydrodynamic conditions make the strata rich in terrigenous clastic quartz particles with larger grain size, and oxygen poor environment is conducive to the enrichment of authigenic quartz with smaller grain size.
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