PREDICTION OF DISTRIBUTION CHARACTERSS· OF VOLCANIC FACIES BY USING SEISMIC AND LOGGING FACIES

A special and complicated oil/gas reservoir,the volcanic oil/gas reservoirs have become the new field for oil/gas exploration and production.This paper discussed characteristics of volcanic geology,logging and logging classification,seismic and seismic classification.Built the patterns of volcanic were established and the seismic were calibrated according to the classification of logging facies.The kind of technique consists of 3 aspects of volcanic facies,logging and seismic and therefore,can be called Three facies technique.In order to reveal the distribution rules and variation properties of the volcanic rocks,the Three facies technique was employed for the volcanic rocks of the Yingcheng Formation in a certain basin.First,the seismic were transformed into volcanic to obtain plan distribution of volcanic facies.Then the spatial distribution rules and favorable zones of volcanic reservoirs were predicted effectively in the volcanic section of Yingcheng Formation.The well drilling verified that the volcanic channel had the best petrophysical properties,followed by intrusive and eruptive facies,with the volcanic sedimentary being the worst.Three facies technique is of important practicability and significance for researching the special distribution and favorable zones of volcanic facies,and can speed the progress of exploration and production for this kind of special and complex oil/gas reservoirs.