黄河滩区复杂表层条件下的激发井深设计

Excitation well depth design for complex surface conditions in the Yellow River beach area

在东部平原地区,激发井深设计通常是依据微测井的表层调查结果和潜水面的调查结果,进行试验资料分析,同时考虑虚反射的影响,选择高速层顶界面下的最佳井深进行激发。但在黄河滩区由于黄河故道变迁导致激发岩性多变,沙岩和泥岩沉积呈多期次交替发育,胶泥层分布不稳定,使得上述方法不能满足精细设计激发井深的需求。分析岩性取芯结果,根据泥沙沉积的特点,提出了以高速层顶界面为主,考虑激发岩性为辅的浮动井深设计方法,指导激发井深的设计工作,确保各激发点位选择最佳的激发因素,提高了全区的激发能量的一致性,取得较好的采集效果。

According to the up-hole surface survey results,the depth of an excitation was designed based on the depth of the top interface of the high-speed layer,which is a conventional method.However,in the Yellow River beach area,the change of the old channel of the Yellow River has led to alteration in the excitation lithology and unstable distribution of the clay layer,indicating that this method is unable to meet the requirements of the fine design of the depth of excitation.Based on the analysis of lithological coring results and the characteristics of sediment deposition,a floating well depth design method was proposed,which was mainly based on the high-speed top interface and supplemented by the excitation lithology,to guide the design of the excitation well depth,improve the consistency of the excitation energy in the whole area,and achieve better acquisition results.