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随着勘探进程的不断深入,胜利探区勘探目标开始转向岩性隐蔽油气藏以及微幅构造等复杂地质目标.为寻找中小型、隐蔽性油气藏,对地震分辨率提出了更高的要求.在炸药震源施工区域,近地表速度、虚反射界面、激发岩性是影响激发频率的三种关键因素.本文针对黄河三角洲近地表复杂结构与多种岩性交互沉积等因素引起单炮品质差异明显的特点,通过综合应用地质学、岩土工程、测井工程等理论和方法,对近地表多种因素及其频率响应特征进行了研究,在此基础上形成了多因素激发井深约束设计方法,在胜利探区多个区块进行了应用,取得了较好的效果.
With the deepening of the exploration process, the targets of exploration in Shengli Exploration Area turned to complex geologic targets such as lithologic subtle reservoirs and micro-structure, etc. In order to find small, medium and subtle reservoirs, the seismic resolution is set higher. In the construction area of dynamite source, the near surface velocities, the fictitious reflection interface and the induced lithology are the three key factors that affect the excitation frequency.In this paper, the differences of single shot quality caused by the interaction between near-surface complex structure and multiple lithologies in the Yellow River Delta Based on the comprehensive application of theories and methods of geology, geotechnical engineering and well logging engineering, a great deal of researches on the near-surface multi-factors and their frequency response characteristics have been carried out. On the basis of this, a multi-factor well constrained design method has been developed. It has been applied in many blocks of Shengli Exploration Area and achieved good results.