基于随钻地震测井的地震导向钻井技术——以塔里木油田哈拉哈塘区块缝洞型储集体为例

Seismic guided drilling technique based on seismic while drilling(SWD):A case study of fracture-cave reservoirs of Halahatang block,Tarim Oilfield,NW China

针对塔里木油田哈拉哈塘地区超深高温碳酸盐岩缝洞型岩溶储集层溶洞在三维空间归位不准确的问题,提出了陆地随钻地震测井(SVWD)和地震导向钻井(SGD)技术相结合的综合解决方案。地震导向钻井技术利用随钻地震测井获取的地层速度更新速度模型,对所钻目标体的三维空间位置重新归位,降低了目标体的不确定性。该方案应用于哈拉哈塘地区两口井,首次在国内陆上油田采集随钻地震数据,根据预测结果实时指导和调整钻井轨迹,两口井均顺利命中目标。实践证明该套技术方案在解决由于速度不确定性以及地质模型的不确定性导致的储集体归位不准确等难题时切实可行。

To deal with the inaccurate three-dimensional positioning of caves in the ultra-deep and high temperature Ordovician carbonate fracture-cave reservoirs in the Halahatang block, this article proposes a new integrated solution which combines seismic guided drilling （SGD） with onshore seismic while drilling （SVWD）. SGD technique uses the newly acquired velocity by SVWD to update velocity model and re-place the target position in three-dimensional space to decrease the uncertainty of the target. The primary drilling targets of two wells in the Halahatang block have been selected to verify this solution. It＇s the first time to collect onshore SVWD date domestically. The two wells landed in the target successfully by guiding and adjusting wellbore trajectory according to near real-time prediction results obtained from SVWD data. The success of these two wells shows the solution combining SVWD with SGD is practicable in solving the misplacing of target reservoirs caused by velocity and geological model uncertainty.