VSP技术在小断块油气田开发中的应用

Application of VSP technology in the oilfield development of small faulted-block.

华北某小断块油气田地处繁华城区,因此不能进行地面地震勘探。为此,对位于小断块的X井进行了多方位非零井源距VSP勘探,获得了井周边地区的高分辨率和高信噪比资料。通过标定,准确确定了任北潜山顶面的反射层位,对井周边地区的构造和小断层进行了解释,圈定了位于潜山顶面的主要目的层——二台阶断块的范围和形态。同时,利用VSP纵波资料的“亮点”特征,并以转换波资料作为印证,对二台阶断块进行了含油气分析,经钻探获得了高产油流。

The ground based seismic exploration cannot be carried out in this area because of flourishing city. The multia-zimuth VSP exploration of non-zero distance from the wellhead was exploited aimed at the X formation in this small block. As a result of this exploration, a high resolution and high SNR record is received, which embodies the area a-round this well. By demarcating, the reflecting position of the top of the Renbei buried hill is precisely confirmed. And the structure interpretation and small faults is carried out and the main target stratum of the top of this buried hill is determined (the range and the configuration of the two-step block is determined). Meanwhile, using the characteristic called 'luminance' of the VSP longitudinal wave and taking the data of converted wave as evidence; the a-nalysis of oil gas content is implemented. Finally, a well with high oil production is found.