Three types of volcanic rocks

i.e.basalt

trachyte

and tuff

are developed in the Shahejie Formation of Ou-Huang area in Liaohe depression.The trachyte that had gone through structural fracturing in la-ter stage forms high-grade reservoir in the area.To acquire accurate parameters that honestly reflect the reservoir space types and features

techniques such as SEM

cast lamella

and X-CT scanning

are integrated for fine description of the primary pores and fractures and secondary dissolution pores and fractures in the reservoir space of trachyte

and for obtaining reservoir physical properties in combination with RLT.The result indicates that the dissolved vuggy-fractured reservoir has the best poroperm properties

and the second best are the dissolved pore-micropore reservoirs.It also suggests that by adopting technologies like log response and multi-well constrained impedance inversion

together with proper choice of methods and parameters

the re-cognition and prediction of high-grade reservoirs in the study area(where conventional techniques are inefficient)is not only possible but consists well with the real drilling/well-logging data(with thickness error at 3% only).