Reserves Recalculate Of Q-Buried Hill Block In Liao He Oil Field

With the continuous of in-depth exploration and development work, unmatched phenomenon has been increasingly prominent between some oil field's reserves and production. The results of statistics that include geologic reserve double calculation (volumetric method) of 56 oilfields and 94 block faults declaration after year 1984 show that geologic reserve have great changes before and after double calculation, error distribution range of different oilfields is mainly concentrated in 6%～72%. The reasons why create error that include:①Basis data is not comprehensive and accurate;②Research work is not enough;③The method of determining parameters is not reasonable. How to improve the accuracy of geological reserves is a tough task for oil field development workers.When volumetric method is used to calculate reserve, unit of calculation should be divided at first, and we should determine oil-bearing area, effective thickness, effective porosity, oil saturation and other parameters. From the formula of calculation reserve with volumetric method, we can see that the factors affecting calculation of reserves include: oil-bearing area, reservoir effective thickness, effective porosity, oil saturation, ground crude oil density, crude oil volume factor and so on. The reliability of calculating reserve by volumetric method depends on the quantity and quality above factors.This paper analyzed many calculation methods of geological reserves in current, determined to calculate geologic reserve with volumetric method , recoverable reserves with dynamic method and checked geologic reserve. Applied 3-D seismic data, confirmed Q buried hill block's construction, fault system; counted wells drilling Q buried hill block; selected the first data in the area. With producing test wells data we identified that depth of water/oil contact plane was 2850 m, oil-gas interface 2600 m, blocked out effective oil and gas-bearing area. According to logging trace, we established an effective thickness chart to determine oil, gas lower limit. Rt was 50~250Ω? m, Ac>190μs/m that was effective oil-bearing thickness depth. According to special deposition situation of buried hill, abandoned reserve calculation method of sandstone reservoir, used slice approach to determine area thickness and region. According to the obtained information, we determined other parameters about quiescent method calculation. The reserve of block was accurately calculated at last. After we used volumetric method to calculate reserve again, we can know that oil area is 8.44 km2, geological reserve of oil is 980×104t, geological reserve of dissolved gas is 8.33×108m3; gas-bearing area was 2.4 km2, geological reserve of natural gas is 7.5×108m3, geological reserve of condensate oil is 23.3×104t.