欢喜岭油田中潜山带成藏期应力场及裂缝分布

寻找古潜山油藏已成为辽河等老油区重要的勘探方向，潜山带中裂缝的发育程度、分布范围等直接影响着潜山油藏的储油潜力和规模。针对潜山裂缝研究这一难点，采用有限元程序和自行开发的后处理软件，实现了大比例尺、参数实测条件下二维应力场的精细模拟计算和裂缝的预测评价。以辽河盆地西部坳陷二级构造欢喜岭油田为例，阐述了油田二维应力场及裂缝精细模拟计算的基本思路，分析了该区中潜山东营组沉积期即成藏期油田应力场分布的基本特征、断裂应力场特点及其控油作用；圈定了中潜山带裂缝发育程度和范围，并作出了合理的评价，为潜山油藏储集和聚油条件的研究提供了研究思路和方法，这对含油气盆地的勘探开发具有重要意义。

Fractural Distribution and Reservoir-Formed Stress Field in Medium Buried Hill Zone of Huanxiling Oilfield

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 detail2D 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 and2D stress field,analyzed the basic feature of the oilfield's stress field distribution in reservoir-formed stage of Dongying for-mation and its faulting stress field characteristics,and discussed oil-controlled effect of the fault,hence defined the extent of fracture develop-ment 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.