关键词: 核桃园组, 断裂(裂缝)面, 开启压力, 闭合压力, 临界开启压力, 临界闭合压力, 稠油开采, 注汽压力

Abstract: The theoretical analysis shows that the open pressure of fault(fracture) section is different from the closed pressure because of different progress.The critical open and closed pressures of fault(fracture) are the parameters for showing the self-characteristics of rock when the positive stress of fault(fracture) is zero.The experiment result of core deformation demonstrates that the closed pressure of fault(fracture) is the same with the critical pressure and similar to the deformation intensity of rock.The experiment results of two kinds of open and closed pressures on the interface of rock demonstrate that the critical closed pressure of sand-stone in the middle-shallow layers of the Tertiary Hetaoyuan Formation in Miyang Depression is greater than the critical open pressure.The critical closed pressure has a logarithmic correlation with the angle of dip of fault(fracture).The critical closed pressure decreases with increasing of the angle of dip.The experimental evaluation of pools in the Tertiary Hetaoyuan Formation of Miyang Depression in Nanxiang Basin showed that the fault was in the state of open pressure when the fault was deeper than 300m.The numerical simulation indicated that the sealed fault was in the situation of open pressure when the vertical distance between oil well and fault section was about 32m for the heavy producing pay and was 35m for the thin producing pay during the steam huff and puff exploitation under the current conditions for construction operation.Therefore,the distance between oil well and fault section should be more than 35m under the critical condition in order to avoid the influence of fault on oil well with steam huff and puff exploitation.

Key words: Hetaoyuan Formation, fault(fracture)section, open pressure, closed pressure, critical open pressure, critical closed pressure, heavy oil exploitation, steam injection pressure