断裂静止期有无输导油气能力的判别方法

A Method Judging the Existence or not of Transporting Oil-Gas Ability of Fault in the Stillstand Period

通过断裂内部结构及输导通道特征研究,得到断裂静止期输导油气通道主要是碎裂岩的连通孔隙,其是否具有输导油气能力主要取决于碎裂岩颗粒粒度、泥质含量和断裂倾角大小。在此基础上,利用物理模拟实验模拟了油气在浮力作用下沿断裂碎裂岩运移速度与碎裂岩颗粒粒度、泥质含量和断裂倾角之间的关系。利用此关系建立了一套断裂静止期有无输导油气能力的判别方法,即运移速度大于零,断裂具输导油气能力,反之则无。并将其应用于海拉尔盆地苏仁诺尔断裂静止期在各组地层中有无输导油气能力的判别中,其结果与地下油气分布情况相符,表明该方法定量判别断裂静止期有无输导油气能力是可行的。

By the study of characteristics of internal structure and transporting pathways in fault, The main transporting pathways of fault in the stillstand period were considered to be the connected pores of kataclasite. The existence or not of their transporting oil-gas ability was decided by the big or small of grain size of kataclasite, mudstone content of kataclasite and tip angle of fault. Based on it, the relation between oil-gas migration velocity through kataclasite of fault under the action of buoyancy and grain size of kataclasite, mudstone content of kataclasite and tip angle of fault were studied by the physical simulation experiment. By the relation a method judging the existence or not of transporting oil-gas ability of fault was established. If the oil-gas migration velocity is more than zero, fault has transporting oil-gas ability, on the contrary , fault don＇t have transporting oil-gas ability . The method was applied in judging the existence or not of transporting oil-gas ability of Surennuoer fault in different state of Hailaer Basin. The results accord with actual geological conditions. It indicates that the method is practical to judge quantitatively the existence or not of transporting oil-gas ability of fault.