地质统计反演在东濮凹陷白庙气田沙三段储层预测中的应用
摘要
本文基于约束稀疏脉冲波阻抗反演进行地质统计反演,把标准化后的自然电位曲线作为输入参数,把稀疏脉冲反演得到的波阻抗数据体作为相关控制函数。首先,统计随机变量的直方图分布和变差函数,确定随机变量在不同方向上的变程;然后在每一地震道上,将随机提取的反射系数与求取的地震子波进行褶积,生成合成地震道,将合成地震道与原始地震道进行匹配,计算反演的剩余值,直到匹配程度满足精度要求为止;最后,选择合成地震记录最好的节点值作为反演结果,对下一个随机选取的节点进行反演,直到完成各个随机实现的全部反演,再对相关性大于90%的各个实现进行求均方根运算,并将获得的均方根数据体作为最终的反演结果。文中以白庙气田三维地震工区沙三段水下扇体为研究对象,在分析储层岩性、电性、物理特征的基础上,选取地震空变子波,建立低频模型,通过合理选取反演参数λ,把标准化后的自然电位曲线作为输入参数,利用约束稀疏脉冲反演和地质统计反演技术,得到的反演结果与实钻资料吻合率达到81.3%,取得了较好的效果。
In this paper based on constrained sparse spike inversion the geostatistical inversion was conducted with the normalized natural potential curve as input and the impedance data volume obtained from constrained sparse spike inversion as correlation control function.At first calculating random variable’s histogram distribution and variogram,determining random variable’s range in different directions,then in each seismic trace by convoluting extracted reflection coefficient with estimated seismic wavelet to obtain synthetic seismogram,by matching the synthetic seismogram with original seismic trace to calculate residual value for the inversion until matching degree meeting the accuracy requirement,at last by choosing the best node value for the synthetic seismogram as inversion result to conduct inversion for the next randomly selected node until finishing the whole inversion,after that conducting root mean square calculation for each realization whose correlativity is larger than 90% until completing whole inversion of the random process.In this paper the submarine fan in the third member of Shahejie Formation,Baimiao Gas-field was taken as study object,based on the analysis for reservoir’s lithology,electrical properties and physical characteristic,the seismic spatial-variable wavelet was chosen and the low frequency model was built up,by selecting reasonable inversion parameterλand taking normalized natural potential curve as input,the inversion was conducted by using constrained sparse spike inversion and geostatistical inversion,the matching rate between inversion result and the drilling result reaches 81.3%,therefore excellent application result was achieved in the paper.
In this paper based on constrained sparse spike inversion the geostatistical inversion was conducted with the normalized natural potential curve as input and the impedance data volume obtained from constrained sparse spike inversion as correlation control function.At first calculating random variable’s histogram distribution and variogram,determining random variable’s range in different directions,then in each seismic trace by convoluting extracted reflection coefficient with estimated seismic wavelet to obtain synthetic seismogram,by matching the synthetic seismogram with original seismic trace to calculate residual value for the inversion until matching degree meeting the accuracy requirement,at last by choosing the best node value for the synthetic seismogram as inversion result to conduct inversion for the next randomly selected node until finishing the whole inversion,after that conducting root mean square calculation for each realization whose correlativity is larger than 90% until completing whole inversion of the random process.In this paper the submarine fan in the third member of Shahejie Formation,Baimiao Gas-field was taken as study object,based on the analysis for reservoir’s lithology,electrical properties and physical characteristic,the seismic spatial-variable wavelet was chosen and the low frequency model was built up,by selecting reasonable inversion parameterλand taking normalized natural potential curve as input,the inversion was conducted by using constrained sparse spike inversion and geostatistical inversion,the matching rate between inversion result and the drilling result reaches 81.3%,therefore excellent application result was achieved in the paper.
引文
[1]孙思敏,彭仕宓,汪新文.东濮凹陷兰聊断层的分段特征及其石油地质意义.石油学报,2003,24(4):26～30
[2]张春生,刘忠保,曹跃华等.歧北凹陷舌状砂体沉积模拟实验.石油与天然气地质,1995,16(2):178～183
[3]冯有良,邱以钢.高精度层序地层学在济阳坳陷下第三系隐蔽油气藏勘探中的应用.石油学报,2003,24(1):49～52,57
[4]吴胜和,武军昌,储勇等.陡坡扇储集层三维沉积相建模研究.石油勘探与开发,2003,30(3)111～113
[5]廖林,边树涛,黄捍东等.松辽盆地南部新立油田泉三、四段薄互层储层预测研究.应用基础与工程科学学报,2008,16(6):811～818
[6]秦伟军,张永华,全书进.精细构造解释与储层预测技术在泌阳凹陷中南部地区二次勘探中的应用.石油物探,2004,43(1):62～66
[7]刘传虎.砂砾岩扇体发育特征及地震描述技术.石油物探,2001,40(1):64～72
[8]孔凡仙.东营凹陷北带砂砾岩扇体勘探技术与实践.石油学报,2000,21(5):27～31
[9]高喜龙,孙希瑞,李顺玲等.测井约束反演在埕岛油田储层预测中的应用.石油地球物理勘探,2001,36(3):334～338
[10]陈广军,宋国奇,王永诗等.斜坡带低位扇砂岩体岩性油气藏勘探方法.石油学报,2002,23(3):34～38
[11]李卫忠,王成礼,马在田.叠前主分量重建随机噪声衰减.石油地球物理勘探,2000,35(2):244～256
[12]王典,刘财,刘洋等.反射法地震勘探噪声消除技术研究.地球物理学进展,2006,21(3):957～970
[13]夏洪瑞,周开明,黄桥等.波阻抗反演技术中空变子波的求取.石油物探,2002,41(4):470～474
[14]孙成禹.空变地震子波提取方法研究.石油大学学报(自然科学版),2000,24(1):77～80
[15]刘成斋,冉建斌,杨永生等.稀疏脉冲和基于模型反演在王家岗沙四段砂岩油藏精细勘探中的应用.石油地球物理勘探,2002,37(4):401～406
[16]唐湘蓉.地震测井联合反演方法研究及应用[硕士学位论文].四川成都:成都理工大学,2005
[17]慎国强,孟宪军,王玉梅等.随机地震反演方法及其在埕北35井区的应用.石油地球物理勘探,2004,39(1):75～81
[18]易平,林桂康.随机地震反演技术及在文昌13-1油田的应用.石油地球物理勘探,2004,39(1):75～81
[19]李方明,计智锋,赵国良等.地质统计反演之随机地震反演方法.石油勘探与开发,2007,34(4):451～455
[2]张春生,刘忠保,曹跃华等.歧北凹陷舌状砂体沉积模拟实验.石油与天然气地质,1995,16(2):178～183
[3]冯有良,邱以钢.高精度层序地层学在济阳坳陷下第三系隐蔽油气藏勘探中的应用.石油学报,2003,24(1):49～52,57
[4]吴胜和,武军昌,储勇等.陡坡扇储集层三维沉积相建模研究.石油勘探与开发,2003,30(3)111～113
[5]廖林,边树涛,黄捍东等.松辽盆地南部新立油田泉三、四段薄互层储层预测研究.应用基础与工程科学学报,2008,16(6):811～818
[6]秦伟军,张永华,全书进.精细构造解释与储层预测技术在泌阳凹陷中南部地区二次勘探中的应用.石油物探,2004,43(1):62～66
[7]刘传虎.砂砾岩扇体发育特征及地震描述技术.石油物探,2001,40(1):64～72
[8]孔凡仙.东营凹陷北带砂砾岩扇体勘探技术与实践.石油学报,2000,21(5):27～31
[9]高喜龙,孙希瑞,李顺玲等.测井约束反演在埕岛油田储层预测中的应用.石油地球物理勘探,2001,36(3):334～338
[10]陈广军,宋国奇,王永诗等.斜坡带低位扇砂岩体岩性油气藏勘探方法.石油学报,2002,23(3):34～38
[11]李卫忠,王成礼,马在田.叠前主分量重建随机噪声衰减.石油地球物理勘探,2000,35(2):244～256
[12]王典,刘财,刘洋等.反射法地震勘探噪声消除技术研究.地球物理学进展,2006,21(3):957～970
[13]夏洪瑞,周开明,黄桥等.波阻抗反演技术中空变子波的求取.石油物探,2002,41(4):470～474
[14]孙成禹.空变地震子波提取方法研究.石油大学学报(自然科学版),2000,24(1):77～80
[15]刘成斋,冉建斌,杨永生等.稀疏脉冲和基于模型反演在王家岗沙四段砂岩油藏精细勘探中的应用.石油地球物理勘探,2002,37(4):401～406
[16]唐湘蓉.地震测井联合反演方法研究及应用[硕士学位论文].四川成都:成都理工大学,2005
[17]慎国强,孟宪军,王玉梅等.随机地震反演方法及其在埕北35井区的应用.石油地球物理勘探,2004,39(1):75～81
[18]易平,林桂康.随机地震反演技术及在文昌13-1油田的应用.石油地球物理勘探,2004,39(1):75～81
[19]李方明,计智锋,赵国良等.地质统计反演之随机地震反演方法.石油勘探与开发,2007,34(4):451～455
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