利用地震资料识别台南气田的天然气  

Using seismic data to identify gas in Tainan gas field.

作　　者：汪功怀[1] 何碧竹[1] 刘亚村[2] 

机构地区：[1]中国地质大学 [2]新疆油田公司研究院地物所

出　　处：《石油地球物理勘探》2004年第2期215-217,共3页Oil Geophysical Prospecting

摘　　要：台南气田为第四系生物成因气藏 ,埋藏深度小、气层厚度大、构造简单 ,有利于地震资料识别油气藏。该区以往地震资料均为常规处理地震剖面 ,信噪比很低、同相轴连续性差 ,看不出任何气层特征。为此 ,我们对一条过气田的测线进行了地震资料处理试验。经分析 ,可以认为采用主频 2 0 Hz进行目标处理最能反映气层地震响应特征 ,如暗点、平点、同相轴下弯、低频效应和极性反转等。依据这些特征可以预测各层段天然气藏平面分布规律 。Tainan gas field is Quaternary biogenetic gas,having characters of shallow buried depth,thicker gas-bearing bed and simple structure,which is of benefit to use seismic data to identify gas reservoir.Because the former seismic data in that area are common-processed seismic sections that have lower S/N ratio and poorer event continuity and any feature of gas-bearing bed has not been seen on the sections.Therefore,the processing tests have been carried out on a seismic line that crosses the gas field.The results showed that using 20 Hz in frequency to carry out target-oriented processing can best reflect the seismic response to the gas-bearing bed,such as dim spot,plat spot,event downwarping,low-frequency effect and polarity reversal etc. The planar distribution of gas reservoir in separate layers can be predicted according to these characters,that meets the need for development of gas field.

关 键 词：地震资料 天然气 台南气田 气层 埋藏深度 主频 柴达木盆地 

分 类 号：P618.13[天文地球—矿床学] P631.44[天文地球—地质学]