The crack forms of the Mesoproterozoic layer in the Jingbei Qianshan Mountains in central Liaoning

Abstract

The Jingbei buried-hill reservoir in central Liaoning is located at the northern end of the Liaohe Basin in the Cenozoic. Its Proterozoic reservoirs have dense, widespread and irregular fracture networks. This paper takes the core of Well An-67 as an example to describe the reservoir fracture patterns in this area. The reservoir fracture patterns are self-similar, with a fractal dimension of 1.34-1.51. The fractures are generally filled with high-condensate oil and generally extend in NE and NW-NWW directions, similar to the distribution of faults in the area. The reservoir fracture density is 1.470-3.030/cm, and the connectivity is 1.227-1.347. Therefore, the fractures not only constitute the main space for oil storage, but also provide channels for underground fluid flow. Reservoir fractures are mainly tectonic in origin. Multi-stage faulting in the area is an important reason for the dense development of fractures, which means that faults are crucial to the exploration and development of this fractured reservoir.