塔河油田12区5小区中完卡层方法探讨

The measure of dividing the target stratum boundary in 12-5 district of Tahe Oil field

塔河油田奥陶系目的层顶界的卡取直接影响井下安全施工和后期油气开采,12区5小区奥陶系上统恰尔巴克组标志层不明显,地层发育厚度横向变化大。已完钻井证实,研读地质设计和邻井资料,掌握地层发育特征,结合地震时间偏移剖面图,宏观分析、预测地层深度和厚度;利用碳酸盐岩分析仪等手段准确识别岩性,做好地层划分,结合控时钻进等手段卡取目的层顶界,在12区5小区中完井深卡层取得了良好的效果。

Dividing the formation boundary of Ordovician target stratum will directly affect the downhole safety and the later oil extraction in Tahe Oil field.The key rock O3q of Upper Ordovician is not obvious,and the horizontal formation thickness has a big change in the 12-5 district.The completed well has proved that according to reading the geological design and the data of neighboring well,combining seismic profile,we can calculate the depth and thickness of strata from the macro aspects;we can denominate drilling break and identify lithology accurately using carbonate content analyser,combining controling drilling time.By the above method,dividing the formation boundary of target stratum has achieved good results in the 12-5district of.Tahe Oil field.