| 基于叠前方位振幅的大港—埕海地区奥陶系风化壳裂缝储层的叠前预测 |
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| 引用本文： | 刘军迎,雍学善,杨午阳,高建虎,周春雷.基于叠前方位振幅的大港—埕海地区奥陶系风化壳裂缝储层的叠前预测[J].地球物理学进展,2012,27(4):1588-1597. |
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| 作者姓名： | 刘军迎 雍学善 杨午阳 高建虎 周春雷 |
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| 作者单位： | 中国石油天然气股份有限公司勘探开发研究院西北分院 |
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| 基金项目： | 中国石油天然气股份有限公司“十一五”后三年《物探技术攻关及集成配套》项目“复杂油气藏地球物理技术研究-裂缝型油气藏地震检测技术研究”(课题编号:2008D-1905);中国石油勘探开发研究院科学研究与技术开发项目“裂缝型油气藏叠前地震检测方法技术研究”资助 |
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| 摘 要： | P波通过裂缝地层传播时,其响应会随着地面观测方位的变化而变化,表现出明显的方位各向异性.这种随方位变化的裂缝响应信息(如振幅等)广泛存在于叠前方位一偏移距二维空间域中,检测此域中的裂缝响应,通过椭圆拟合的方法识别各向异性的存在,进而计算裂缝的方向——椭圆长轴的方向,和裂缝密度——椭圆长轴与短轴的比.本文研究出了一种基于常规叠前地震反射振幅来检测裂缝的三维叠前裂缝储层预测方法.它采用面元组合的方法扩大方位角和偏移距范围;采用多级数据控制技术获取所需的信息;采用稳妥的技术步骤来预测.通过大港油田实际工区的应用,结果表明本文研究出的方法技术应用效果好、精度高、经济实用.
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| 关 键 词： | 方位 偏移距 椭圆拟合 裂缝方向 裂缝密度 |
Prestack fracture reservoir bed estimation of Ordovician weather layer of Dagang—ChengHai area based on azimuthal prestack seismic amplitude |
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| LIU Jun-ying
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YONG Xue-shan
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YANG Wu-yang
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GAO Jian-hu
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ZHOU Chun-lei.Prestack fracture reservoir bed estimation of Ordovician weather layer of Dagang—ChengHai area based on azimuthal prestack seismic amplitude[J].Progress in Geophysics,2012,27(4):1588-1597. |
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| Authors: | LIU Jun-ying YONG Xue-shan YANG Wu-yang GAO Jian-hu ZHOU Chun-lei |
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| Institution: | (Northwest Geological Institute,China National Petroleum Corporation,LanZhou,730020,China) |
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| Abstract: | The seismic response of P-wave,which is propagated through the media of fracture layer,is varied with the orientation of seismic field survey line.It appears out a conspicuous characteristic of anisotropy.This kind of anisotropic information exist widely in the prestack seismic data with two dimension domain of azimuth and offset.we can detect the seismic response information of the crack,then do the ellipse fitting for the information,then calculate the fracture direction—the direction of long axis of ellipse,and the fracture density—the ratio of long axis of the ellipse to the short axis of the ellipse.In this paper,we have developed a three dimension(3D) prestack estimation way of fracture reservoir bed,based on conventional P-wave prestack seismic data which is reflective amplitude data.It extends the azimuthal range and offset range of seismic data by bin-combining,it obtains the necessary data information by data multi-level control,it predicts fractures by the conservative steps.The results from real data shows that this method and technique has a good effect and is a high-precision and economical means. |
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| Keywords: | azimuth offset ellipse fitting fracture orientation fracture density |
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