Abstract
Taking a steam flooding experimental area in the West depression in Liaohe Basin in China as an example, the development characteristics of reservoir oil-gas-water system is studied using methods of geological statistics and comparative analysis based on the comprehensive of core, well logging, analytical test, and development performance data. The aimed stratum has good oil-bearing properties, and the oil content level of cores is mainly oil sand and oil-bearing sandstone. The lower limit of effective reservoir has a porosity of 28% and a permeability of 30 mD. In the aimed stratum, the oil viscosity increases gradually with the increase of oil density, and the correlation between the wax content and density of oil is not obvious. With the increase of oil viscosity, the resin and asphaltene contents increase. And with the increase of oil density, the resin and asphaltene contents gradually increase as well. The oil density is relatively big, and most of the 14 samples have a density greater than 0.97 g/cm3. The oil viscosity is mostly greater than 5000 mpa s. The wax content is relatively low (mostly less than 2.5%) with the maximum of 4%. The contents of resin and asphaltene are both greater than 38%, which are relatively high. The formation water is NaHCO3 type which is slightly alkaline. The oil-water contacts of different reservoirs in Yulou oil-bearing sets I are between depth of 1020 m and 1060 m. The distribution of oil layers is jointly controlled by the sediments and structures factors. For the thickness of single oil layer, the maximum is more than 5 m, while the minimum is only one to 2 m. The edge and bottom water plays a very important role in the development of oilfields. In designing and executing various EOR methods in the process of thermal recovery, the influence of reservoir oil-gas-water system should be fully taken into account.
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