Abstract: To find out buried hill reservoir is an important exploration realm for old oil regions like Liaohe oilfield. However, the extent of fractural development and distribution pattern in buried hill zone can directly affect potential and scale of the buried hill reservoir. For this key point in fracture study, finite element procedure and self-developed post-processing software have been applied to simulate and calculate in detail 2D stress field under large scale and parameter survey condition along with prediction analysis of the fractures. Taking Huanxiling oilfield located in western Liaohe basin as an example, this paper presented basic ideas for detailed simulating and calculating the fractural distribution and 2D stress field, analyzed the basic feature of the oilfield's stress field distribution in reservoir-formed stage of Dongying formation and its faulting stress field characteristics, and discussed oil-controlled effect of the fault, hence defined the extent of fracture development in medium buried hill. Finally, this paper proposed reasonable evaluation of it, which provides the study idea and method for the buried hill reservoir and accumulation condition. These can be as guide for exploration and development of the petroliferous basin.

Key words: 2D stress field, numerical simulation, oil control by fault, fracture quantitative prediction, buried hill, Liaohe oilfield