CHARACTERISTICS OF VOLCANIC ROCK RESERVOIRS IN THE LINSHANG AREA OF THE HUIMIN SAG

Core description,well logging interpretation,porosity and permeability data and mercury-injection curves were used in this paper to study the char cteristics of volcanic rock reservoirs in the Sha 1 Member of Linshang area,the Huimin Sag,the Bohaiwan Basin.The volcanic rock reservoirs in this area were mainly composed of volcanic breccia and tuff,and they had different response characters on logging curves.The reservoir spaces of volcanic rocks included intergranular pores,solution openings and structural fractures.The pore structure was characterized by small pores and thin throats and bad pore-throat connectivity and sorting degree,which were the inner factors to result in the bad correlationship between porosity and permeability.Volcanic rock facies affected the development of reservoir spaces of volcanic rocks,and the middle-upper part of volcanic clastic facies and the top of explosion talus facies were the best favorable facies zones for accumulation.And they are the main exploration targets in searching for the oil and gas pools of volcanic rocks in the future.