Chemically Active Elements of Reservoir Quartz Cement Trace Hydrocarbon Migration in the Mahu Sag, Junggar Basin, NW China

Figure 4

Distribution of electron microprobe analysis points (a) and major element contents (b) in quartz in a sample from well D13. (c, d) The distribution of LA-ICP-MS analysis points and major and trace element contents in quartz in the same sample (sample S016, 4209 m depth). Q-1 = core of the quartz grain; Q-2 = quartz overgrowth.

(a)

(b)

(c)

(d)