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对川口油田长 6油层岩心显裂缝作了统计、分析 ,并制作薄片进行了微裂缝观察。在延河剖面长 6油层作了野外裂缝测量。结果表明 :川口油田长 6油层存在天然显裂缝与微裂缝。裂缝方向以近 EW向为主 ,同时发育近 SN向裂缝。显裂缝频率平均为 0 .4条 / m,切深变化范围不大 ,以高角度缝为主 ,只有 11.1%的裂缝被少量钙质充填 ,在地下多为闭合形式 ;微裂缝开度主要区间为 5～ 15μm,孔隙度极低 ,内蕴渗透率相对较低 ,从 0～ 10 0 μm2不等 ,面密度小 ,仅为 0 .0 0 2 6 / mm,延伸长度为 0～ 2 mm,仅 12 %以下被矿物充填 ,与大裂缝夹角主要为 0～ 10°,主要发育在显裂缝周围。同时 ,通过真实砂岩微观模型实验和注水井与生产井之间的注采分析 ,研究了裂缝对注水开发的影响。
The cracks of Chang 6 oil layer in Kawaguchi oilfield were statistically analyzed, and the flakes were observed for micro-cracks. Field cracks were measured in Chang 6 reservoir of Yanhe section. The results show that Chang 6 reservoir of Kawaguchi oil field has natural obvious cracks and micro-cracks. The direction of fractures is mainly near EW, and at the same time, nearly SN fractures are developed. The average frequency of significant cracks is 0.4 strip / m, and the range of depth of cut is not large. The fractures are dominated by high-angle fractures. Only 11.1% of the fractures are filled with a small amount of calcium, mostly in the closed form underground. Is 5 ~ 15μm, the porosity is very low, the intrinsic permeability is relatively low, ranging from 0 ~ 100μm2, the surface density is small, only 0 .0 0 2 6 / mm, the extension of 0 ~ 2 mm, Only 12% were filled with minerals, and the angle between the major cracks is 0 ~ 10 °, mainly in the vicinity of significant cracks. At the same time, through the real sandstone micro-model experiment and injection-production analysis between injection well and production well, the influence of the fracture on water injection development was studied.