Fine Description Of Shahejie Reservoir Of Block Wa-60 In Liaohe Oilfield

Wa-60 Blocks develop four sets of reservoir groups,the main reservoirs include E3S3 and E₃S₁₊₂.There are two groups of the system of faults,northeast and northwest.In the period of E3S3,the very thick of alluvial fan of sand was deposited.The main lithofacies are the dark grey, the quality of clay and sand and mud.The average thickness is about 170～400 metres. In the period of E₃S₁₊₂, the main lithofacies are the gray and white gray pebbly sandstone, ranging from boulders to mud. The average thickness is about 50～80 metres.There are 17 faults, one is reverse fault and others are normal faults, divided mainly into two groups of the system （the north east and north west）, same to the regional structure. The main structure is the anticline fault fracture in the form of north west-north south, and was cut into 15 different size and different shape blocks.The alluvia main include the inner, middle and outer alluvia,and the middle alluvia is the main reservoir in the E3S3. In the E₃S₁₊₂,the delta facies is developing, include the front,nearshore delta and the plain.The buried depth of top of reservoir of E3S3 is in 1360-1510m. The bearing oil section is about 60-150m,the thickness of reservoir is large presenting massive reservoir. The buried depth of top of reservoir of E₃S₁₊₂ is in 1340-1430m,The bearing oil section is about 20-40m,the thickness of reservoir is thin,mainly in a thick layer.The reservoir type is mainly lithologic structure, the E₃S₁₊₂ reservoir is the pure oil reservoir with some edge water, the oil water contact is 1460m. The E3S3 reservoir is bottom water reservoir,the oil water contact is different, from the. south to north, the OWC is deeper.Crude oil density produced from E3S3 is 0.95-0.99g/cm3（20℃）, gas-free oil viscosity （100℃, ground）is 500-3124mPa.s.In the same condition, crude oil density of the oil produced from E₃S₁₊₂ is0.96-0.99g/cm³,and the gas-free oil viscosity is 248-731mPa.s.Geological model was adopted by 10m multiply 10m multiply 0.5m grid, established a structure model, sedimentation model and reservoir parameters model. By the reservoir numerical simulation, a large heavy oil heating production model was established and formatted 4 blocks’remaining oil map and remaining reserves map, combining with the oil reservoir engineering method.