Exploration degree of Tarim Basin, however, is not high, so effective source rock distribution cannot be precisely defined only by geochemical index of the well sites.

According to geologic structural location, features of occurrence, rock fabric and geochemical index of basalt in Ruqi clough of Helan Mountain, it can be regarded as continental rift basalt.

The most of oil fields with industrial index are also located at the cross districts between basin and tectonic recessive geochemical boundaries.