Petrologists,both at home and abroad have spent a lot of time on the classification of pyroclastic rocks, and suc_cessively put forward the classification of pyroclasts, the petrographic and the petrogenetic classification of pyroclasic rocks.

Because the type of igneous rock is more,it is very difficult to name and identify,we apply Bayesian discrimination to research lithologic identification in the logging interpretation of volcaniclastic rock.

The Nibao gold deposit in Guizhou consists of multistory gold ore bodies,each of which is closely associated with the Permian volcaniclastic rocks.

meanwhile,the volcaniclastic rocks were modificated by the thermal fluid activity,for example,sericitization of plagioclase,chloritization of volc.

A gold deposit associated with pyroclastic rock and hydrothermal exhalation:Nibao gold deposit in Guizhou Province,China;

Features of igneous rock and pyroclastic rock and their influences on Yaopo coal-bearing formation,Beijing area;

Research Methods is applied in Hailar in pyroclastic rock recognition issues in Hailar,and have achieved good results.

Their potentiality of reservoir is too bad to form oil-producing formation, expect for the pyroclastic rocks.

The component of pyroclastic rocks are complex.

Currently, As the scale and depth continues to increase on oil and gas exploration, in many parts of the world, An increasing number of hydrocarbon reservoirs are found in pyroclastic rocks, for example, there develop a large-scale reservoirs of pyroclastic rocks in Hailar Basin of China, Therefore, people add important attention to research the evaluation about pyroclastic rock reservoir.