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  

The influencing factors and response characteristics of acoustic time logging in tight oil horizontal well:A case study of Chang 7 Reservoir in Longdong Area of Ordos Basin

作　　者：时建超 屈雪峰 雷启鸿 刘建 李书恒 谢启超 王长胜 

机构地区：[1]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,陕西西安710018

出　　处：《西北大学学报（自然科学版）》2017年第4期585-592,共8页Journal of Northwest University（Natural Science Edition）

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)

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。Acoustic time is one of the important means for logging interpretation and reservoir evaluation, but the logging environment of horizontal well is different from that of the vertical well, and the original interpreta- tion model of vertical well is no longer applicable, which cause some problems about the logging interpretation of horizontal well. The study shows that laminated shale, anisotropy of rock, position relation between well traj- ectory and stratum, investigation depth of logging instrument, are major influencing factors of acoustic time in horizontal well logging. Because of laminated shale in the sandstone and argillaceous surrounding rock, the a- coustic time of the sandstone with argillaceous lamina or argillaceous strip appears abnormal high ; being main- ly controlled by anisotropy of rock, the acoustic time of of massive sandstone and the mudstone in horizontal well is lower than that in vertical well, and the anisotropy of mudstone is stronger than that of sandstone.Based on the mathematical statistics method, the relationship of acoustic time between the horizontal well and vertical well is established, which could adjust acoustic time of horizontal well to that of vertical well, which is good for logging interpretation and reservoir evaluation.

关 键 词：鄂尔多斯盆地 致密油水平井 声波时差 影响因素 测井响应特征 

分 类 号：P631[天文地球—地质矿产勘探]