致密油水平井声波时差测井影响因素分析及测井响应特征研究——以鄂尔多斯盆地陇东地区长7储层为例

发布时间：2018-05-08 12:58

本文选题：鄂尔多斯盆地 + 致密油水平井　；参考：《西北大学学报(自然科学版)》2017年04期

【摘要】：声波时差是进行测井解释和储层评价的重要手段之一,但水平井测井环境有别于直井,原有的直井解释模型已不再适用于水平测井,导致水平井测井解释存在一定问题。研究认为,层状泥质、岩石各向异性、井眼轨迹与地层几何位置关系及仪器探测深度等是水平井声波时差测井的主要影响因素;受砂体内层状泥质或井眼附近泥质围岩的影响,含泥质纹层或泥质条带砂岩声波时差测井出现高异常;岩石各向异性特征是造成水平井块状砂岩及泥岩声波时差测井值低于直井的主要控制因素,且泥岩的声波时差各向异性的特征强于砂岩。同时,该研究应用数理统计法建立了水平井和直井对应岩层声波时差的相关关系,可将水平井环境下的声波时差校正为直井环境下的声波时差,对测井解释和储层评价具有较好的指导意义。
[Abstract]:Acoustic time lag is one of the important methods for logging interpretation and reservoir evaluation, but the logging environment of horizontal wells is different from that of vertical wells, and the original interpretation model of horizontal wells is no longer suitable for horizontal logging, which leads to some problems in logging interpretation of horizontal wells. It is considered that layered mud, anisotropy of rock, relationship between borehole trajectory and geometric position of formation and depth of instrumentation are the main influencing factors of acoustic time difference logging in horizontal wells, which are affected by layered muddy in sand body or muddy surrounding rock near borehole. High anomaly occurs in sonic time difference logging of sandstone with muddy stripe or mudstone stripe, the anisotropy of rock is the main controlling factor which causes the acoustic time difference of block sandstone and mudstone in horizontal well to be lower than that of straight well. The acoustic time difference anisotropy of mudstone is stronger than that of sandstone. At the same time, the correlation relationship between horizontal well and vertical well is established by using mathematical statistics method. The acoustic time difference in horizontal well environment can be corrected to sound wave time difference in horizontal well environment. It has good guiding significance for logging interpretation and reservoir evaluation.
【作者单位】：中国石油长庆油田分公司勘探开发研究院低渗透油气田勘探开发国家工程实验室;
【基金】：中国石油天然气股份有限公司重大科技专项基金资助项目(2011E-2602)
【分类号】：P618.13;P631.81

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