摘要
泌阳凹陷新庄地区构造破碎,小断块发育,储层埋藏浅(只有50～800 m),地震波纵、横向速度变化剧烈,常规的地震成像方法难以满足勘探开发的需要。针对这些特点,进行了叠前时间偏移和保护浅层反射信息的处理,包括叠前数据的基础处理,速度模型的建立和偏移参数的确定三个重要环节。通过叠前去噪、高精度静校正、远偏移距拉伸处理、分偏移距能量均衡等得到了高品质的叠前数据体;通过偏移、速度分析,再偏移、再速度分析多次迭代,确定了最佳偏移速度;根据目的层倾角分布情况,选择最佳偏移孔径和偏移倾角参数,提高了成像精度。最终时间偏移成果剖面上断层清楚、信息丰富。通过综合解释,对泌阳凹陷新庄地区断裂特征取得了新的认识,发现了一批新圈闭,经钻探见到了良好的油气显示。
Xinzhuang area in Biyang sag is characterized by complex structures,well developed minor fault blocks,and shallowly buried reservoirs(only 50-800m).Because the velocity of P-wave and S- wave changes greatly,conventional seismic imaging method can not satisfy the needs of exploration and development.Aiming at the characteristics,we have adopted the shallow seismic data process- ing technologies including pre-stack de-noise,high-accuracy stat- ics,far-offset stretching,and offset division energy equalization for data process.Meanwhile,we also studied the pre-stack time mi- gration technologies such as migration velocity field establishment, migration aperture selection,and migration dip identification.In addition,we obtained the pre-stack data volume by protecting the information of shallow layers and improving the S/N of middle and deep layers.In terms of the distribution of target formation dips, proper migration aperture and dip parameters were selected to im- age the pre-stack time migration on the whole data volume.After processing,the imaging accuracy was improved.The final result profiles show clear faults and abundant information.Through com- prehensive interpretation,some new understandings have been ac- quired about the fault characteristics of Xinzhuang area,Biyang sag,some new traps discovered,and good oil/gas encountered in drilling.
出处
《石油物探》
EI
CSCD
2008年第4期376-380,共5页
Geophysical Prospecting For Petroleum
