精细刻画南海古近系油藏的叠前地质统计学反演
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摘要
针对南海珠江口盆地古近系油藏埋深大,储层背景复杂,地震资料分辨率低、品质差,造成构造解释不确定和储层预测精度低、难度大等问题,首先对目的层段建立了岩石物理正演模型,重构开发井密度、声波测井曲线;进行岩石物理分析,建立了岩石物理量版为叠前反演提供理论依据;其次,将叠前时间偏移道集进行保振幅、保信噪比、保AVO(振幅随偏移距的变化)特征重处理,并按偏移距分为近、中、远5个分叠加道集,在精细层位标定基础上,选择合理的反演参数,进行AVA(振幅随入射角的变化)叠前稀疏脉冲反演(CSSI),获得比常规地震资料分辨率高的反演弹性参数体,从而改善岩性和层位解释,增强储层特征描述精度,再根据岩石物理量版预测储层空间分布;为了更精细地满足目的层段砂、泥薄互层的描述精度,在AVA叠前CSSI的基础上,采用AVA地质统计学反演技术,获得多个高精度储层反演实现体,从中筛选出符合构造、地质、油藏储层参数模型的反演实现,建立高分辨率精细地质模型,精细描述深部油藏的储层,落实油藏储量,推动油田开发方案设计及井位优化调整。
In consideration of the problems of deep burial of reservoirs,complex geological background and low resolution of seismic data,poor data quality in Paleogene Reservoirs of Pearl River Mouth Basin in the South China Sea,the uncertainty in structural interpretation and low accuracy of reservoir prediction were induced and it was difficult for interpretation.In order to elaborate description of reservoir,first in consideration of the target zones,a petrophysical forward model was established,by reconstructing the density of development wells and acoustic logging curves,the rock physical property was analyzed,and rock physical template was established for providing theoretical basis for prestack inversion.Secondly,the pre-stack time migration gather was re-processed and divided into five superimposed gathers of near,middle and far distances,based on fine horizon calibration,reasonable inversion parameters were chosen for carrying out AVA prestack sparse spike inversion(CSSI),therefore the lithologic and stratigraphic interpretation was improved,reservoir characterization accuracy was enhanced,and them based on rock physical template,the reservoir space distribution was predicted.In order to meet the accuracy of finer description of sand and mud thin interbeds in the target zones and on the basis of pre-stack sparse spike inversion(CSSI),AVA geo-statistical inversion techniques are used to obtain multiple bodies for high precision reservoir inversion,from which the structural,geologic and reservoir parameters suitable for inversion are chosen for establishing the geological model with high resolution,it is used for fine description of deep reservoirs,determining reserves,for the optimization of oilfield development plan and adjustment of well locations.
In consideration of the problems of deep burial of reservoirs,complex geological background and low resolution of seismic data,poor data quality in Paleogene Reservoirs of Pearl River Mouth Basin in the South China Sea,the uncertainty in structural interpretation and low accuracy of reservoir prediction were induced and it was difficult for interpretation.In order to elaborate description of reservoir,first in consideration of the target zones,a petrophysical forward model was established,by reconstructing the density of development wells and acoustic logging curves,the rock physical property was analyzed,and rock physical template was established for providing theoretical basis for prestack inversion.Secondly,the pre-stack time migration gather was re-processed and divided into five superimposed gathers of near,middle and far distances,based on fine horizon calibration,reasonable inversion parameters were chosen for carrying out AVA prestack sparse spike inversion(CSSI),therefore the lithologic and stratigraphic interpretation was improved,reservoir characterization accuracy was enhanced,and them based on rock physical template,the reservoir space distribution was predicted.In order to meet the accuracy of finer description of sand and mud thin interbeds in the target zones and on the basis of pre-stack sparse spike inversion(CSSI),AVA geo-statistical inversion techniques are used to obtain multiple bodies for high precision reservoir inversion,from which the structural,geologic and reservoir parameters suitable for inversion are chosen for establishing the geological model with high resolution,it is used for fine description of deep reservoirs,determining reserves,for the optimization of oilfield development plan and adjustment of well locations.
引文
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[7]王思权,李瑞.天然气勘探与开发概率密度函数随机反演在储层预测中的应用——以蜀南某地区嘉陵江组储层预测为例[J].天然气勘探与开发,2008,31(9):23～26.
[2]徐胜峰,李勇根,曹宏,等.地震岩石物理研究概述[J].地球物理学进展,2009,24(2):680～691.
[3]孟宪军,慎国强,王玉梅,等.叠前AVA地震地震纵横波阻抗同步反演技术研究[J].石油物探,2004,43(增刊):53～55.
[4]王家华,王镜惠,梅明华.地质统计学反演的应用研究[J].吐哈油气,2011,16(3):201～204.
[5]孙思敏,彭仕宓.地质统计学反演方法及其在薄层砂体预测中的应用[J].西安石油大学学报(自然科学版),2007,22(1):41～44.
[6]刘俊州,周小鹰,王箭波,等.地质统计学反演在非均质薄砂岩气藏开发中的实践[J].内蒙古石油化工,2009,19(7):16～19.
[7]王思权,李瑞.天然气勘探与开发概率密度函数随机反演在储层预测中的应用——以蜀南某地区嘉陵江组储层预测为例[J].天然气勘探与开发,2008,31(9):23～26.
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