频率衰减属性在深层碳酸盐岩油气勘探中的应用
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摘要
针对BL地区长兴组地层碳酸盐岩礁滩相岩性油气藏具有埋藏深、油气分布不均匀的特征,提出了应用频率衰减梯度属性和低频伴影现象相结合进行油气检测的思路。首先介绍了频率衰减梯度和低频伴影现象的方法原理;其次结合研究区长兴组地层的储层物性参数建立地质模型,运用黏滞弥散型波动方程模拟和分析了该类储层的地震响应特征,模型分析表明利用频率衰减梯度属性和低频伴影现象识别此类储层的含气性是可行的。实际资料的应用证实频率衰减梯度属性和低频伴影现象对该类储层都有较好的指示,其预测结果能够相互验证,提高了储层预测及流体检测的准确性,为BL地区长兴组地层碳酸盐岩礁滩相岩性油气藏及类似油气藏的油气识别及流体检测提供了思路。
According to deep burial depth,uneven oil and gas distribution of carbonate reef flat lithologic reservoir of Changxing Formation in BL area,this paper put forward a train of thought for hydrocarbon detection which combined frequency attenuation attributes and low frequency ad joint-shadow phenomenon.This paper first introduced the principle of frequency attenuation attributes and low frequency ad joint-shadow phenomenon;secondly established geological model combined with the reservoir physical parameters of Changxing Formation in BL area,and simulated and analyzed the seismic response characteristics of the reservoir by using viscosity-diffusivity wave equation.The model analysis result shows that it is feasible to detect gas-bearing properties of reservoir by using frequency attenuation attributes and low frequency ad joint-shadow phenomenon.Application of real data demonstrates that frequency attenuation attributes and low frequency ad joint-shadow phenomenon has good instruction to the reservoir,and improved the accuracy of reservoir prediction and fluid detection,which can provide a way for oil-gas identification and fluid detecttion of carbonate reef flat lithologic reservoir and similar reservoirs of Changxing Formation in BL area.
According to deep burial depth,uneven oil and gas distribution of carbonate reef flat lithologic reservoir of Changxing Formation in BL area,this paper put forward a train of thought for hydrocarbon detection which combined frequency attenuation attributes and low frequency ad joint-shadow phenomenon.This paper first introduced the principle of frequency attenuation attributes and low frequency ad joint-shadow phenomenon;secondly established geological model combined with the reservoir physical parameters of Changxing Formation in BL area,and simulated and analyzed the seismic response characteristics of the reservoir by using viscosity-diffusivity wave equation.The model analysis result shows that it is feasible to detect gas-bearing properties of reservoir by using frequency attenuation attributes and low frequency ad joint-shadow phenomenon.Application of real data demonstrates that frequency attenuation attributes and low frequency ad joint-shadow phenomenon has good instruction to the reservoir,and improved the accuracy of reservoir prediction and fluid detection,which can provide a way for oil-gas identification and fluid detecttion of carbonate reef flat lithologic reservoir and similar reservoirs of Changxing Formation in BL area.
引文
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[8]王孟华,崔永谦,张锐峰,等.泥灰岩裂缝储层预测方法研究——以束鹿凹陷为例[J].岩性油气藏,2007,19(3):114-119.
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[2]Klimentos T,McCann C.Relationships among compressional wave attenuation,porosity,clay content,and permeability in sandstones[J].Geophysics,1990,55(8):998-1014.
[3]王大兴,辛可锋,李幼鸣,等.地层条件下砂岩含水饱和度对波速及衰减影响的实验研究[J].地球物理学报,2006,49(3):908-914.
[4]席道瑛,邱文亮,程经毅,等.饱和多孔岩石的衰减与孔隙率和饱和度的关系[J].石油地球物理勘探,1997,32(2):196-201.
[5]尹陈,贺振华,黄德济.基于弥散-黏滞型波动方程的地震波衰减及延迟分析[J].地球物理学报,2009,52(1):215-221.
[6]黄中玉,王于静,苏永昌.一种新的地震波衰减分析方法——预测油气异常的有效工具[J].石油地球物理勘探,2000,35(6):768-773.
[7]何又雄,钟庆良.地震波衰减属性在油气预测中的应用[J].江汉石油科技,2007,17(3):9-11.
[8]王孟华,崔永谦,张锐峰,等.泥灰岩裂缝储层预测方法研究——以束鹿凹陷为例[J].岩性油气藏,2007,19(3):114-119.
[9]张固澜.地震波吸收特性及应用研究[D].成都:成都理工大学,2008.
[10]Sheriff R E.Encyclopedic dictionary of applied geophysics(The fourth edition)[M].Tulsa:Society of Exploration Geophysics,2002.
[11]王小品,贺振华,熊晓军.基于子波衰减的低频伴影数值模拟及油气检测[J].大庆石油地质与开发,2011,30(1):157-160.
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