The study shows that cretaceous volcanics mainly consist of medium acidic volcanic lava and volcanoclastic rocks , with locally developed basic lava ; medium acidic volcanics mainly consists of calc - alkalic series , was formed in compressive orogenic environment , and has good reservoir property , while cretaceous basis lava mainly consists of alkalic series , was formed in rift environment , and has poor reservoir property 結(jié)果認為,白堊紀火山巖以中酸性火山熔巖和火山碎屑巖為主,局部發(fā)育基性熔巖;中酸性火山巖以鈣堿性系列為主,形成于擠壓造山環(huán)境,儲集性能較好,而白堊紀基性熔巖以堿性系列為主,形成于裂谷環(huán)境,儲集性能較差。