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Petrophysical experimental research in Tanan tuffaceous pyroclastic rock reservoir
HAN Xue-hui1,LI Lai-lin2,YANG Long3,ZHAO Hai-bo2,CHENG De-an2,QIU Ji-liang4
(1.School of Geosciences in China University of Petroleum, Qingdao 266580, China ;2. Exploration and Development Research lmtitute,Daqing Oilfield Company Limited, Dating 163712, China;3. Heavy Oil Development Company of Xinjiang Oilfield,Karamay 834000,China ;4. Drilling Company No. 1,Dating Drilling and Prospecting Engineering Company,Daqing 163411,China)
Abstract:
Under the condition of simulated formation temperature and pressure, the compression and shear wave velocity of the tuffaceous conglomerates and rock-fragment sandstones of the reservoirs in Kit, Kin group of Cretaceous system in Tanan were measured. The effects of lithology, mineral content, cementation type and particle contact mode,density, porosity, shale content, and water saturation on the aroustic velocity of the tuffaceous pyroclastic rock were studied. Within the observation limits, some rules are found :①The aroustic velocity of the fine tuffaceous conglomerates is remarkably greater than that of the tuffaceous rock-fragment sandstones with good physical property. ?The acoustic velocity increases with fragment content increasingt and decreases with quartz and feldspar content increasing.③In the same porosity, the velocity of porous cementation and lineal contact rock is the biggest, the velocity of basal cementation and raatrix-suppot-point contact rock is the smallest and the compression velocity is more sensitive to the cementation type and particle contact mode than shear wave velocity.④The acoustic velocity increases with density increasing, and the velocity of luiTaceous rock-fragment sandstones keeps a good relation with density in form of power function. The acoustic velocity decreases with porosity and shale content increasing, ihe velocity of the tuffaceous rock-fragment sandstones keeps a good relation with porosity and shale conlent in form of negative linear function, but effect of shale (be made of tuffaceous) content is only 5-10 times as small as that of the
Key words:  iuffaceous pyrociastic rock  acoustic velocity  cementation type  particle contact mode  pelrophysical property