大庆长垣以东地区低孔渗储层裂缝对油田开发效果的影响

Effect of Fissure of Low Porosity and Permeability Sand Reservoir in Eastward Daqing Placanticline on Oil Field Development

研究了大庆长垣以东的朝阳沟油田、头台油田、榆树林油田的低孔渗砂岩储层裂缝的发育特征及分布规律．其裂缝的产状、规模、分布主要受断裂和构造高部位、砂岩厚度以及埋藏深度的影响．断层附近和构造高点裂缝发育，薄互层砂岩裂缝发育，岩层埋藏越浅裂缝越发育．裂缝对于油田注水开发影响较大，裂缝发育区油井具有较高的初期产能，但也存在过早水淹、越流渗透、水动力封闭边界等不利影响．

We have made a research into the natural fissure and its characteristics and distribution rule in the low porosity and permeability sand reservoir immanently located in Chaoyanggou oil field, Toutai oil field, Yushulin oil field in Daqing placanticline eastward. The fissure's attitude, scale and distribution are mainly affected by fissure, especially thin interbed fissure. The shallower the rocks are buried, the more fissures there are. Fissures have effect on water injection and well fields in fissure areas have better initial capacity, but there are some disadvantages such as water out, hydrodynamic enclosing boundary, the key method to overcome this is the proper lay\|out of water injection well pattern and controlling water injection pressure.