The Exquisite Comparison of Shale Mineralogical-Geochemical Characteristics between Chang 7 Member and Chang 9 Member in Yanchang Formation, Ordos Basin

Table 1

Statistical table of samples numbers corresponding to experimental methods.

Experimental methods	C7-2SM	C7-3SM	C9M
XRD	25	17	18
Trace element analysis	25	15	20
TOC and ROCK-EVAL.II methodology analysis	96	29	31
Vitrinite reflectance values	40	13	17

Note: “TOC, ROCK-EVAL.II analysis” means the sample from same depth was used in all the three experiments.