Evaluation of Favorable Shale Gas Intervals in Dawuba Formation of Ziyun Area, South Qian Depression

Figure 5

Images of SEM observation for the Dawuba Formation shale. The red arrows point to the organic matter and organic matter pores. The yellow arrows point to the pores related to quartz and pyrite. The blue arrows point to the pores among clay minerals. (a) 2946 m, the 1st member, black shale; (b, j) 2929 m, the 1st member, black shale; (c) 2811.5 m, the 4th member, black shale; (d) 2942.15 m, the 1st member, black shale; (e) 2950 m, the 1st member, black shale; (f, g) 2946.6 m, the 1st member, black shale; (h, i) 2983.3 m, the 1st member, black shale; (k, m) 2950.1 m, the 1st member, black shale; (l) 2932.95 m, the 1st member, black shale; (n, o) 2946.6 m, the 1st member, black shale; (p) 2883.5 m, the 2nd member, black shale; (q) EDS spectrum of red “+” in image (h); (r) EDS spectrum of red “+” in image (l).

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