基于模型分析的OBC采集方向选择
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摘要
海上油气勘探中应用常规拖缆方式采集数据的方位角相对较窄,难以满足复杂构造的勘探需求;而采用海底电缆方式可通过调整缆数和缆间距实现宽方位角数据采集。本文从地层建模出发,对层位解释成果数据进行Delaunay剖分,求解剖分构建的三角面空间坐标和地质产状等信息;对这些信息进行统计分析,得到勘探区构造走向、倾向和倾角等数据;据此设计地震勘探主采集方向,调整缆数和缆间距参数,拓展方位角信息,使其兼顾主构造方向和次级构造方向的数据采集,以进一步提高复杂构造的成像质量。
The acquisition azimuth of conventional streamer seismic surveys is relatively narrow,and is unsuitable for complex structure areas.But for OBC survey,wide-azimuth data acquisition can be achieved by selecting the number of cables and a cable spacing.In this paper,based on stratigraphic model we first conduct the depth domain Delaunay triangulation on interpreted stratigraphic data,calculate split triangles spatial coordinates,and acquire geological information. Then we obtain structure trend,tendency and dips of the exploration area using statistical analysis,and build a geological model.Finally based on this model we select appropriately the number of cables and a cable spacing in OBC acquisition geometry design in order to get wider azimuth and better images of complex structures.
The acquisition azimuth of conventional streamer seismic surveys is relatively narrow,and is unsuitable for complex structure areas.But for OBC survey,wide-azimuth data acquisition can be achieved by selecting the number of cables and a cable spacing.In this paper,based on stratigraphic model we first conduct the depth domain Delaunay triangulation on interpreted stratigraphic data,calculate split triangles spatial coordinates,and acquire geological information. Then we obtain structure trend,tendency and dips of the exploration area using statistical analysis,and build a geological model.Finally based on this model we select appropriately the number of cables and a cable spacing in OBC acquisition geometry design in order to get wider azimuth and better images of complex structures.
引文
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[9]罗良峰.离散三角网格上的法向量和曲率估计[硕士学位论文].辽宁大连:大连海事大学,2007.Luo Liangfeng.Normal Vectors and Curvatures Estimation on Discrete Triangular Mesh.Dalian:Dalian Marine University,2007.
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[11]蒋有录.渤海湾盆地天然气聚集带特征及形成条件.石油大学学报(自然科学版),1999,23(5):61-62.Jiang Youlu.Geological characteristics and formation conditions of the natural gas accumulation belts in BoHai bay basin.Journal of the University of Petroleum,China(Edition of natural science),1999,23(5):61-62.
[12]蔡乾钟.中国海域油气地质学.北京:海洋出版社,2005,120-125.
[13]万桂梅,汤良杰,周心怀等.渤海海域新近纪—第四纪断裂特征及形成机制.石油学报,2010,31(4):591-595.Wan Guimei,Tang Liangjie,Zhou Xinhuai et al.Neogene-Quaternary fault characteristics and its formation mechanism in Bohai Sea.Acta Petrolei Sinica,2010,31(4):591-595.
[2]朱伟林,米立军,高阳东等.领域性突破展现中国近海油气勘探前景———2011年中国近海油气勘探回顾.中国海上油气,2012,24(1):1-5.Zhu Weilin,Mi Lijun,Gao Yangdong et al.Exploratory field breakthroughs exhibit the future of hydrocarbon exploration offshore China:a review of hydrocarbon exploration offshore China in 2011.China Offshore Oil and Gas,2012,24(1):1-5.
[3]万芃,吴衡.海洋高分辨反射地震电缆技术分析.中国科技成果,2010,16:66-69.Wan Peng,Wu Heng.Cable technical analysis of high-resolution marine seismic reflection.China Science and Technology Achievements,2010,16:66-69.
[4]Gijs J O Vermeer著;李培明,何永清译.三维地震勘探设计.北京:石油工业出版社,1958,55-57.
[5]沈晓忱.模型正演方法在川东黄泥堂高陡复杂构造上的应用.中国石油学会复杂地表与复杂构造条件下的地球物理勘探技术研讨会论文集,1999,89-94.
[6]刘惠媛.三维海底地形绘制方法研究与实现[硕士学位论文].黑龙江哈尔滨:哈尔滨工程大学,2009Liu Huiyuan.Research and Implementation of ThreeDimensional the Seabed Terrain Rendering Method.Haerbin:Harbin Engineering University,2009
[7]付民.图像三角网格化算法的研究与实现[硕士学位论文].湖北武汉:华中科技大学,2010.Fu Min.Research and Implementation of Image Triangular Mesh Algorithm.Wuhan:Huazhong University of Science and Technology,2010.
[8]许天会.不规则三角网的建立与应用[硕士学位论文].湖北武汉:华中科技大学,2007.Xu Tianhui.The Establishment and Application of the Irregular Triangulated Network.Wuhan:Huazhong University of Science and Technology,2007.
[9]罗良峰.离散三角网格上的法向量和曲率估计[硕士学位论文].辽宁大连:大连海事大学,2007.Luo Liangfeng.Normal Vectors and Curvatures Estimation on Discrete Triangular Mesh.Dalian:Dalian Marine University,2007.
[10]Long A S,Ramsden C R T,Hoffmann J.On the issue of strike or dip streamer shooting for 3D multistreamer acquisition.Exploration Geophysics,2004,35(2):105-110.
[11]蒋有录.渤海湾盆地天然气聚集带特征及形成条件.石油大学学报(自然科学版),1999,23(5):61-62.Jiang Youlu.Geological characteristics and formation conditions of the natural gas accumulation belts in BoHai bay basin.Journal of the University of Petroleum,China(Edition of natural science),1999,23(5):61-62.
[12]蔡乾钟.中国海域油气地质学.北京:海洋出版社,2005,120-125.
[13]万桂梅,汤良杰,周心怀等.渤海海域新近纪—第四纪断裂特征及形成机制.石油学报,2010,31(4):591-595.Wan Guimei,Tang Liangjie,Zhou Xinhuai et al.Neogene-Quaternary fault characteristics and its formation mechanism in Bohai Sea.Acta Petrolei Sinica,2010,31(4):591-595.