多种放射性方法在LZ油田上圈定油气藏的效果及其评价

Evalution on different radioactive methods in delineating hydrocarbon reservoirs in LZ Oilfield

南京大学, 南京210008

Nanjing University, Nanjing 210008

本文介绍目前常用的八种放射性方法在LZ油田上探测油气藏的试验效果。结果表明, 八种方法圈定油气藏的效果不同：氡法和水铀法比地面γ能谱法效果好；氡法中累积测氡法比瞬时测氡法好；累积测氡法中氡管法和α卡法的分辨油气异常的能力强, 工作效率也高, 特别是氡管法反映LZ油气藏及断层分布的效果最好。建议采用以氡管法或α卡法为主, 配合地面γ能谱法, 水铀法做检验的综合方法圈定油气藏, 这将会明显地提高应用效果。

The results from applying eight conventional radioactive methods to detecting hydrocarbon reservoirs in LZ Oilfield are found to be different from each other. Among them thc radon method (RM) and the uranium-in-groundwater method (UGM) produce better results than that the surface γ spectrum method (SγSM ) does, while the cumulative radon-content determination (CRCD) might be superior to the instantaneous one (IRCD) in RM, since the radon tube method (RTM) and the α-card method (αCM) usable for CRCD prove powerful and efficient in identifying hydrocarbon anomalies especially when RTM is in application to making certain of the distribution for the reservoirs and faults in LZ Oilfield. The paper concludes that an integrated application of RTM or αCM supplemented with SγSM and finally verified using UGM may result in significant improvement in delineating hydrocarbon reservoirs and is thus worth recommending.