基于模型面向目标的观测系统优化设计技术
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摘要
准噶尔盆地南缘山前复杂构造带推覆构造发育,由于推覆构造上盘速度较高,上覆地质结构又比较复杂,造成推覆断面及下伏构造的地震成像效果普遍比较差。根据波动方程地震波照明结果,利用照明统计法确定了针对某勘探目的层的地面最优炮点加密范围;利用射线追踪和波动方程模拟联合照明,综合分析了地下各目的层上覆盖次数和能量的贡献分布曲线,确定了针对这些目的层的最优检波器排列方式和排列长度。应用结果表明,整个地震剖面成像质量有了较大的提高,推覆面下隐伏构造形态完整,成像效果好。
The nappe structure is well developed in the complicated piedmont structural belt of Junggar basin. Due to higher speed of transmission and relative complex geological structure in hanging wall block of the nappe, seismic imaging ability is poor for the faulted surface and underlying structures. Based on seismic wave illumination result of wave equation, optimal infill of surface shotpoints for certain exploration targets is determined by illumination statistics. The joint illumination is modeled by ray-tracing and wave equation. The overlapping amount and energy distribution curve on the targets are analyzed, and optimal arrangement of geophones in respect to the targets is suggested. As a result, imaging quality of seismic profile is improved and subtle structures underlying the nappe are clearly imaged.
The nappe structure is well developed in the complicated piedmont structural belt of Junggar basin. Due to higher speed of transmission and relative complex geological structure in hanging wall block of the nappe, seismic imaging ability is poor for the faulted surface and underlying structures. Based on seismic wave illumination result of wave equation, optimal infill of surface shotpoints for certain exploration targets is determined by illumination statistics. The joint illumination is modeled by ray-tracing and wave equation. The overlapping amount and energy distribution curve on the targets are analyzed, and optimal arrangement of geophones in respect to the targets is suggested. As a result, imaging quality of seismic profile is improved and subtle structures underlying the nappe are clearly imaged.
引文
中国石化西部新区勘探指挥部,2005年春季准噶尔盆地南缘米泉区块二维地震采集、处理(解释)一体化项目攻关指导书,2005
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[1]董良国,吴晓丰,唐海忠,等.逆掩推覆构造的地震波照明与观测系统设计[J].石油物探,2006,45(1):40￣47
[2]尹成,吕公河,田继东,等.基于地球物理目标参数的三维观测系统优化设计[J].石油物探,2006,45(1):74￣78
[3]秦顺亭.当前中国西部新区物探工作的几点思考[J].中国西部石油地质,2005,1(2):124￣127
[4]熊翥.山前冲断带物探技术的改进思路[J].中国石油勘探,2005,10(2):28￣32
[5]熊翥.我国西部山前冲断带油气勘探地震技术的几点思考[J].勘探地球物理进展,2005,28(1):1￣4
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