天然气沿断裂运移规律的物理及数值模拟

PHYSICAL AND NUMBERICAL SIMULATION ON GAS MIGRATION LAWS THROUGH FAULT

利用自行设计组装的模拟实验装置,对原油沿断裂运移的规律进行了物理模拟,结果表明,原油沿断裂运移速度具有与断裂带倾角成正比、与断裂带填充物粒度和泥质含量成反比的规律。利用模拟实验研究了原油和天然气通过岩样运移速度之间的函数关系,结果查明其比值大小与砂岩孔隙度成直线反比关系、与渗透率成指数反比关系。在此基础上,利用原油沿断裂运移规律对天然气沿断裂运移规律进行了数值模拟,在相同条件下发现了天然气沿断裂运移速度较原油大两个数量级以上和天然气沿断裂运移速度与断裂带倾角也成正比、与断裂带填充物粒度和泥质含量也成反比的规律。

Using experiment installation desigend and installed by ourselves, this paper simulated oil migration laws through fault. The results indicate that there is a direct proportion relation between the migration velocity of oil through fault and inclination angle of fault, there is an inverse proportion relation between the migration velocity of oil through fault and granules and mudston cotents of filling material in fault zone. Using simulation experiment, this paper studied the relation between the migration velocity of oil through sandstone example and that of gas through sandstone example. Three is a inverse proporation relation between the ratio between the migration velocity of oil through sandstone example and that of gas through sandstone example and porosity and permeation of sandstone example. Based on it, this paper studied the migration laws of gas through fault by numberical simulation according to the migration law of oil through fault. Considered the miaration velocity of gas to be a few hundred times more than that of oil through fault in the same conditions. There is a direct proportion relation between the migration velocity of gas through fault and inclination angle of fault, there is an inwerse proportion relation between the migration velocity of gas through fault and granules and mudstone content of filling material in fault zone.