大庆长垣密井网开发区储层地震预测研究
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摘要
本文围绕大庆长垣密井网开发区地质需求,在不同测井资料环境校正、归一化校正、曲线重构及地震岩石物理分析的基础上,研究地震属性分析技术定性预测井间厚层砂体分布特征,研究密井网宽带约束地震反演技术预测井间薄层砂体的横向变化,提高了储层预测精度,为老油田精细油藏描述研究提供了新思路,研究成果在优化喇嘛甸油田喇5-平221井水平井轨迹设计中得到应用,使该井砂体钻遇率达到94.6%。
1、研究了以双标准层趋势面为主的测井曲线校正方法,消除了测井环境和测井仪器引起的随机误差和系统误差,为岩石物理分析和井震匹配研究提供了保障。
2、应用岩石物理分析Greenberg-Castagna横波预测模型建立了陆相中孔砂泥岩横波预测方法,实现了喇嘛甸油田横波预测,通过2口井验证实测横波与预测横波相关系数达0.93以上,为叠前地震属性分析及弹性地震反演工作奠定了基础。
3、分别建立了油层、油层组及小层在不同岩性、孔隙度和含油饱和度条件下的地震岩石弹性参数变化函数关系,分析了波阻抗变化率与含油饱和度之间变化规律:在含油饱和度为0～50%时,波阻抗与泊松比交会图及纵波与横波交会图上波阻抗、泊松比、纵波的变化率增大明显,而当饱和度在50%～80%时,波阻抗、泊松比、纵波的变化率变化平缓。
4、研究区在不同含油饱和度条件下,油层组之间合成记录相应发生比较明显的变化。萨Ⅱ及下部油层组,随着含油饱和度增大,振幅能量逐渐增强,相位略向下移;萨Ⅱ以上油层组,随着含油饱和度逐渐增大,振幅能量变化不明显。
5、基于地震属性分析的模糊神经网络技术,预测厚层砂体的横向变化,完善了沉积微相带图,提高了对河道砂体类型的认识程度。
6、在曲线重构、地震数据加密采样、空变子波体等技术研究基础上,采用序贯高斯配置协模拟和模拟退火宽带约束反演等方法,实现了密井网条件下高分辨率地震反演及井间小层砂体预测,20口后验井验证砂岩预测符合率达到90%。
7、研究成果在喇嘛甸油田优化喇5-平221井水平井轨迹方案中发挥了重要作用,开发地震成为长垣油田水平井设计中的一项重要技术。
In this paper, focusing on geological requirements of dense wells of Daqing Changyuan Oilfield development area, on the bases of different log information correction, curve reconfiguration and seismic petrophysical analysis, research seismic attribute analysis technique to predict characteristics of thick bed sand body of crosswells, research the horizontal change of cross-well thin sands with dense wells broadband constrained seismic inversion. This technique improve reservoir forecast accuracy, and provide new thinking for maturing field in fine description of reservoir. The research effort has been applied to the optimization of La5-Ping221 horizontal well design in Lamadian Oilfield, in the case of wells drilled sandbody 94.6%.
1 Studied by log correction give priority to double standard trend surface layer, removed the logging environment and logging device caused by random errors and system errors. It provided safegrard for petrophysical analysis seismic and make well match seismic.
2 S-wave prediction means of continental facies mid-porosity sand/mudstone has been established by the application of petrophysical analysis of Greenberg-Castagna S-wave prediction model, achieving a S-wave prediction of Lamadian Oilfield. By the two wells to verify the measured S-wave and predicted S-wave correlation coefficient was more than 0.95, which laid the foundation for the pre-stack seismic attribute analysis and elastic inversion work.
3 Seismic rock elastic parameters functional relationship which are in different lithology, porosity and oil saturation condition of oil layer, oil layer group and member, has established , respectively. And analysed the change between acoustic impedance and oil saturation.The results show that acoustic impedance, Poisson’s ratio and the rate of P-wave increased significantly, based on crossplot of the acoustic impedance vs Poisson’s ratio, crossplot of P-wave vs S-wave, when oil saturation increased from 0% to 50%, and when oil saturation between 50%~80%, acoustic impedance, Poisson’s ratio, and the rate of P-wave are in smooth.
4 The study area in different oil saturation conditions, the synthetic seismogram of the oil layer group took place obvious changes. To SaⅡand the lower reservoir, the energy of amplitude gradually increased with the oil saturation increases, and phase slightly to the downward, above the oil layer group SaⅡ, with the increasing oil saturation, the energy of amplitude of did not change obviously.
5 Owing to Fuzzy Neural Network technology of seismic attribute analysis, forecasted the horizontal change of thick bed sands, consummated deposition microfacies belt figure, having improved recognition of types of the channel sand body.
6 Based on accoustic travel time curve reconstruction, infill resampling and the space variant wavelet, with sequence Gauss allocation common simulation and simulated annealing broadband constrained inversion means and so on, achieved a dense wells under the conditions of high resolution seismic inversion and layer sand body forecast among wells, verified coincidence rate sand layer of 20 posterior-wells had been reached 90%.
7 Results of research in the field to optimize Lamadian Oilfield La 5-Ping 221 horizontal track arrangement, and Reservoir Geophysics becomes an important technique in the design of horizontal wells of Changyuan Oilfield.
1、研究了以双标准层趋势面为主的测井曲线校正方法,消除了测井环境和测井仪器引起的随机误差和系统误差,为岩石物理分析和井震匹配研究提供了保障。
2、应用岩石物理分析Greenberg-Castagna横波预测模型建立了陆相中孔砂泥岩横波预测方法,实现了喇嘛甸油田横波预测,通过2口井验证实测横波与预测横波相关系数达0.93以上,为叠前地震属性分析及弹性地震反演工作奠定了基础。
3、分别建立了油层、油层组及小层在不同岩性、孔隙度和含油饱和度条件下的地震岩石弹性参数变化函数关系,分析了波阻抗变化率与含油饱和度之间变化规律:在含油饱和度为0～50%时,波阻抗与泊松比交会图及纵波与横波交会图上波阻抗、泊松比、纵波的变化率增大明显,而当饱和度在50%～80%时,波阻抗、泊松比、纵波的变化率变化平缓。
4、研究区在不同含油饱和度条件下,油层组之间合成记录相应发生比较明显的变化。萨Ⅱ及下部油层组,随着含油饱和度增大,振幅能量逐渐增强,相位略向下移;萨Ⅱ以上油层组,随着含油饱和度逐渐增大,振幅能量变化不明显。
5、基于地震属性分析的模糊神经网络技术,预测厚层砂体的横向变化,完善了沉积微相带图,提高了对河道砂体类型的认识程度。
6、在曲线重构、地震数据加密采样、空变子波体等技术研究基础上,采用序贯高斯配置协模拟和模拟退火宽带约束反演等方法,实现了密井网条件下高分辨率地震反演及井间小层砂体预测,20口后验井验证砂岩预测符合率达到90%。
7、研究成果在喇嘛甸油田优化喇5-平221井水平井轨迹方案中发挥了重要作用,开发地震成为长垣油田水平井设计中的一项重要技术。
In this paper, focusing on geological requirements of dense wells of Daqing Changyuan Oilfield development area, on the bases of different log information correction, curve reconfiguration and seismic petrophysical analysis, research seismic attribute analysis technique to predict characteristics of thick bed sand body of crosswells, research the horizontal change of cross-well thin sands with dense wells broadband constrained seismic inversion. This technique improve reservoir forecast accuracy, and provide new thinking for maturing field in fine description of reservoir. The research effort has been applied to the optimization of La5-Ping221 horizontal well design in Lamadian Oilfield, in the case of wells drilled sandbody 94.6%.
1 Studied by log correction give priority to double standard trend surface layer, removed the logging environment and logging device caused by random errors and system errors. It provided safegrard for petrophysical analysis seismic and make well match seismic.
2 S-wave prediction means of continental facies mid-porosity sand/mudstone has been established by the application of petrophysical analysis of Greenberg-Castagna S-wave prediction model, achieving a S-wave prediction of Lamadian Oilfield. By the two wells to verify the measured S-wave and predicted S-wave correlation coefficient was more than 0.95, which laid the foundation for the pre-stack seismic attribute analysis and elastic inversion work.
3 Seismic rock elastic parameters functional relationship which are in different lithology, porosity and oil saturation condition of oil layer, oil layer group and member, has established , respectively. And analysed the change between acoustic impedance and oil saturation.The results show that acoustic impedance, Poisson’s ratio and the rate of P-wave increased significantly, based on crossplot of the acoustic impedance vs Poisson’s ratio, crossplot of P-wave vs S-wave, when oil saturation increased from 0% to 50%, and when oil saturation between 50%~80%, acoustic impedance, Poisson’s ratio, and the rate of P-wave are in smooth.
4 The study area in different oil saturation conditions, the synthetic seismogram of the oil layer group took place obvious changes. To SaⅡand the lower reservoir, the energy of amplitude gradually increased with the oil saturation increases, and phase slightly to the downward, above the oil layer group SaⅡ, with the increasing oil saturation, the energy of amplitude of did not change obviously.
5 Owing to Fuzzy Neural Network technology of seismic attribute analysis, forecasted the horizontal change of thick bed sands, consummated deposition microfacies belt figure, having improved recognition of types of the channel sand body.
6 Based on accoustic travel time curve reconstruction, infill resampling and the space variant wavelet, with sequence Gauss allocation common simulation and simulated annealing broadband constrained inversion means and so on, achieved a dense wells under the conditions of high resolution seismic inversion and layer sand body forecast among wells, verified coincidence rate sand layer of 20 posterior-wells had been reached 90%.
7 Results of research in the field to optimize Lamadian Oilfield La 5-Ping 221 horizontal track arrangement, and Reservoir Geophysics becomes an important technique in the design of horizontal wells of Changyuan Oilfield.
引文
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