辽宁中部静北潜山中元古界储层裂缝型式

辽宁中部静北潜山油藏位于新生代辽河盆地的北端,其元古界储层发育着密集、遍布和不规则的裂缝网络。本文以安67井岩心为例,描述了该区的储层裂缝型式。储层裂缝型式具有自相似性,分数维为1.34～1.51。裂缝一般被高凝油充填,总体上呈NE向和NW-NWW向展布,与区内断层分布相似。储层裂缝密度为1.470～3.030/cm,连通性为1.227～1.347,因此裂缝不仅构成了石油储集的主要空间,还提供地下流体流动的通道。储层裂缝主要是构造成因的,区内多期断层作用是造成裂缝密集发育的重要原因,意味着断层对该裂缝性油藏的勘探和开发至关重要。

FRACTURE PATTERN OF MIDDLE PROTEROZOIC RESERVOIR IN JINGBEI BURIED HILL, CENTRAL LIAONING PROVINCE

The Jingbei buried-hill reservoir in central Liaoning Province lies in the northern part of Liaohe Basin, where exists dense, pervasive and irregular fracture network in the pools. Cores from well A-67 were analyzed to depict the fracture pattern in the reservoir. Fractures are mostly filled with oil and have the same orientations as NE and NW-NWW in the areas. Fracture density range from 1.470 to 3,030/cm, whereas connectivity range from 1.227 to 1.347. Fractures thus provide both major room for oil accumulation and conduit for subsurface fluid flows. Fracture patterns are self-similar with fractal dimensions from 1.34 to 1.51. Most fractures are likely to be structure in origin. The authors believed that multiple faulting might have been the main cause of dense fractures in the reservoir and that interpreted faults play a significant role in hydrocarbon exploration and development.