北美天然气勘探和钻井的重点已由常规储层转移到致密含气砂岩和页岩等非常规储层。这些储层孔隙度很低,渗透率接近于0,天然气储存在天然裂缝和基岩孔隙中。有经济效益的天然气开采需通过人工压裂使现存的天然裂缝或基岩孔隙相连通,压裂的成功与否取决于地层的地质力学脆性是否能够利于产生大量的次生裂缝。由于这些远景区的非均 The focus of North American gas exploration and drilling has shifted from conventional reservoirs to unconventional reservoirs such as tight gas sands and shales. The porosity of these reservoirs is very low and their permeability is close to zero. Natural gas is stored in natural fractures and bedrock pores. The economic exploitation of natural gas needs to connect the existing natural fractures or bedrock pores through artificial fracturing. The success or failure of fracturing depends on whether the geomechanical brittleness of the formation can facilitate the generation of a large number of secondary fractures. Due to the non-uniformity of these prospects