ARE THERE LAKES OR RIVERS OF OIL UNDERGROUND?
No. Oil and gas accumulate in the pores (openings) between silt and sand grains and in small openings in limestone and dolomite.
Figure 7—Places where oil is found in Illinois: (a) coral reefs, (b) anticlines, (c) pinch-outs, and (d) channel sandstones.
EXPLANATION Glacial drift Dolomite Shale Gas saturated zone Sandstone Oil saturated zone Limestone Water saturated zone