关键词: 凝灰质储层, 矿物学, 岩石力学, 压裂, 兴安岭群, 海拉尔盆地

Abstract: The tuffaceous volcanic reservoirs ofXing’anling group in Hailaer Basin, DaqingOilfield, includes andesite-rhyolite tuffaceous, andesite tuffaceous and trachy-rhyolite tuffaceous volcanic rocks. In the process of hydraulic fracturing, there are some problems to deal with, such as early sand plug, low return discharge rate and low success rate of fracturing. Through the experiment of rock hydraulic property and rock dynamics features research, it is put forward that the measures to be launched include: ① For tuffaceous,volcanic reservoirs with high-content clay, it is should increased the preventing dilatability of fracturing fluid, enlarging discharge capacity construction, in order to boost the net pressure of fractures;②For alkaline tuffaceous and ultra-alkaline tuffaceous reservoirs, it is should utilized the fracturing fluid to reduce filtration loss and enhance the preventing dilatability of fracturing fluid;③ For strong plastic tuffaceous reservoirs, it is should enlarged the discharge capacity