Fig. 9 | Scientific Reports

Fig. 9

From: Accurate lithofacies identification in deep shale gas reservoirs via an optimized neural network recognition model, Qiongzhusi Formation, southern Sichuan

Fig. 9

Characteristics of sedimentary structures within DWS facies. (a) Core photo of A103 well (3584.74 m), siliceous shale with horizontal bedding and pyrite. (b) Core photo of A103 well (3425 m), transgression erosion. (c) Core photo of Z2 well (4694.04 m), carbonaceous shale. (d) Core photo of Z2 well (4693.94 m), carbonaceous shale with mirror scratches, and pyrite particles. (e) SEM image of Z2 well (4693.98 m), numerous organic matter develops in the intergranular pores.

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