Abstract: There are mainly complicated fault block oil reservoirs with bad physical property and high heterogeneity on account of the affectation of depositional environment in eastern oilfield of our country. NgI oil layer team in fault block 3 of Yang Sanmu oil-field is complicated fault block viscous and crude basal water
reservoir. It has been exploited for about 30 years however the recovery ratio is at present below eight percent and the produc-lion effect is badly. The paper puts forward the adjusting strategy of drilling crowding horizontal well and crowding straight well ac-companied by measures of integrally excavating producing poten-fiat for oil or water wells, through elaborate reservoir description and research on remaining oil distribution making certain oil lay-
er and remaining oil distribution in three一dimensional space. The successful drilling and exploration of Yang Hl well makes the strong base for next adjustment and potential excavating and provides referenced signification for the producing of the same type reservoirs to some extent.

Key words: viscous oil reservoir, bottom water reservoir, oil reservoir description, remaining oil distribution, pattern ad-justment, horizontal well