磁力计调查:影响底线的多学科合作

Muhd Akram Kamaruzaman, Mohd Saifullah Din, Ernyza Endot, P. Sim, Chrissie Lojikim, C. Chang, Mohd Faiz Mohd Ramli
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摘要

自20世纪50年代以来,人们已经对卢科尼亚中部进行了数百口井的勘探。在此期间,所有海上油井都使用双曲线定位系统钻井,与目前的卫星定位系统相比,双曲线定位系统的精度较低,而卫星定位系统仅在20世纪90年代初推出。有了这些知识,在未来的开发钻井中,旧探井的位置(在20世纪70年代钻探)在海底阻塞和潜在的井碰撞方面存在潜在的危险。如果没有可靠的地震与井的联系,解释人员很难识别碳酸盐岩顶部事件进行深度转换,从而影响井的交付、静态模型的建立和地下储量的估计。根据标准现场调查程序,使用多波束回声测深仪(MBES)、侧扫声纳(SSS)和海底剖面仪(SBP)进行了现场验证,但由于油井已被废弃并在海底被切断,因此无法检测到现有井口位置。使用磁力计进一步调查现有井口位置;传感器被拖到距船尾约三(3)倍水深和距海床10米高度处。为了导航拖曳式传感器,超短基线(USBL)应答器连接在传感器附近,以获得实时水下定位。五(5)条测量线以疑似现有井口为中心设计,覆盖半径为60m。在数据采集过程中,系统通过接收器记录磁异常,并使用总磁数据进行进一步分析,从而得出发现的井口位置。在解释过程中,圈定了环境磁场畸变区,并将其标记为异常,即“疑似井口区”。这种扭曲的幅度和模式被用于解释,并与测量船上的定位系统(水面和水下)的坐标相结合。总的磁场读数在40920nT ~ 41130nT之间,磁异常/井口的磁场值在100nT ~ 115nT之间。总磁场分析信号值范围为0 ~ 3.5。目标磁异常是指分析信号值最大的区域,也是总磁场变化最剧烈的区域。从调查结果来看,与现有井口位置相比,新发现的井口位置在48m - 53m之间变化。通过对老井口位置的确认,这有助于避免未来开发井的井碰撞研究,同时也改善了地震与井的联系分析,为顶部碳酸盐岩选择提供更高的可信度,并在储层段中更好地进行反向地震匹配,以确定物性分布。
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Magnetometer Survey: Multi-Discipline Collaboration Impacting Bottom Line
Central Luconia has been explored with hundreds of well since the 1950s. During that time, all offshore wells were drilled using hyperbolic positioning system which has lower accuracy compare to current satellite positioning system, which was only introduced in early 1990s. With this knowledge, the old exploration well's locations (which was drilled in 1970s) pose potential hazards in terms of seabed obstruction and potential well collision during the future development wells drilling. Without a reliable seismic to well tie, interpreter has difficulty in identifying the top of carbonate event for depth conversion, thus impacting the well delivery, static model building and subsurface reserves estimation. Onsite verification was carried out using a multibeam echosounder (MBES), a Side Scan Sonar (SSS), and a Sub Bottom Profiler (SBP) in accordance with standard site survey procedures, but the existing wellhead location was unable to be detected because the wells had been abandoned and cut off at the seabed level. Magnetometer was deployed to further investigate the existing wellhead location; the sensor was towed approximately about three (3) times water depth from the stern of the vessel and altitude 10m from the seabed. To navigate the towed sensor, Ultra Short Baseline (USBL) transponder was attached close to the sensor to get real time underwater positioning. Five (5) survey lines were designed centered at the suspected existing wellhead location with the coverage of 60m radius. During data acquisition, the magnetic anomalies were recorded in the system via receiver and total magnetic data was used for further analysis to derive the as-found wellhead location. During the interpretation, the area of ambient magnetic field distortion was identified and marked as anomaly which represents "area of suspected wellhead". The magnitude and pattern of such distortion was used for interpretation and combined with the coordinates from the positioning system (surface and underwater) onboard the survey vessel. The general total magnetic field reading is ranging between 40920nT and 41130nT with the magnetic anomaly/wellhead had magnetic value from 100nT to 115nT. The total magnetic field analytical signal value is ranging from 0 to 3.5. The target magnetic anomaly refers to the area with greatest analytical signal value where it is also the area with most drastic change of the total magnetic field. From the survey results, the as-found wellhead position varies from 48m - 53m compared to existing wellhead position. With the confirmation on the old wellhead location, this helps to derisk the well collisions study for future development well and also improves the seismic to well tie analysis to provide higher confidence in the Top Carbonate pick and a better inverted seismic match in the reservoir interval for properties distribution.
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