三维叠前时间偏移剖面揭示的百58井地区断裂带构造特征  

Structural Feature of Fault belts in Bai 58 Well Revealed 3-D prestack time migration section

作　　者：赵玉莲[1,2] 李斐[2] 王海燕[3] 马建华[2] 

机构地区：[1]成都理工大学,成都610059 [2]中国石油勘探开发研究院西北分院,兰州730020 [3]中国地质科学院地质研究所岩石圈中心,北京100037

出　　处：《地球物理学进展》2011年第5期1733-1740,共8页Progress in Geophysics

基　　金：青年科学基金项目"若尔盖盆地的深部构造及其与西秦岭造山带岩石圈尺度的构造关系"(40604010)资助

摘　　要：准噶尔盆地西北缘百58井区是一个被多条断裂切割的复杂断块区,地层倾角变化大,断裂分布多.百58井地区已有三维地震资料成果剖面显示,地震波组连续性差,断裂带附近资料成像模糊,断面很难进行准确的空间识别与追踪,地层的接触关系不清楚,无法进行精细构造解释,制约了该区的深化勘探.为此,在详细分析原始资料特点和存在的问题的基础上,对该区已有三维地震资料开展了叠前时间偏移处理技术研究.获得了归位精度高、复杂构造成像清晰、断点清楚的剖面,真实地揭露了该区百-乌断裂带断裂发育特征、空间展布及平面组合关系,发现和确定了二叠系、三叠系和侏罗系的各类圈闭,为后续的精细构造解释、储层预测等提供了可靠的依据.Baiquan area on the northwestern margin of Junggar basin is a complex fault-block area cut by multiple faults with Variable dip of layers and the distribution of multiple faults. The old sections of 3D seismic data in Bai58 well region show the poor continuity of seismic events, poor imaging data near the fault zone, and the unclear contact relationship between strata. So it is difficult to explain fine structure and the deepening exploration has been constrained. According to these issues, we use several processing softwares such as Omega, CGG and Geodepth to do fine＂three-high-accurate＇processing and pre-stack time migration on base of the analysis of the raw seismic data and problem, and obtain the realistic section. The migration profile revealed the development characteristics, spatial distribution patterns and the relationship of surface composition of Bai-Wu fault, and various types of traps of Permian, Triassic, Jurassic-Cretaceous structural layer are found. This provides some reliable evidence for subsequent fine structure interpretation and reservoir prediction.

关 键 词：叠前时间偏移 复杂构造 信噪比 断裂带 构造特征 

分 类 号：P631[天文地球—地质矿产勘探]