Mechanism of Forming Low Resistivity in Shale Reservoirs

Figure 14

Pyrite distribution in QEMSCAN diagram. A qualitative mineral analysis was performed for samples from both wells N1 and W4-10-2 by a scanning electron microscope (SEM). However, SEM can identify common minerals except overmature organic matters. Like isolated islands, pyrite can be found in nonconductive common minerals, but the isolated pyrite makes no real difference in resistivity. This is very similar to the effect of rock resistivity of carbonate reservoirs with isolated vugs, and He et al. [19] give similar numerical simulation results about isolated shapes.