四川盆地三台—合川区块地震技术应用效果分析及适用技术评价
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摘要
四川盆地上三叠统须家河组陆相碎屑岩蕴藏巨大油气资源潜力,近年来在川中合川、广安等地区均钻获高产气流。研究区须家河组气藏以岩性气藏和岩性—构造气藏为主,储层纵横向非均质性强,以薄互层为主,具有低孔低渗的特点,同时储层含流体情况复杂,储层预测和含气性检测的难度较大。针对须家河组此类低孔低渗透岩性气藏,通过叠前保真处理技术获得高品质叠前道集,利用以弹性参数反演为主的叠前储层定量预测技术,以及综合弹性多参数法和扩展弹性阻抗反演的流体检测技术,有效提高了研究区须家河组储层和含气性预测的精度,取得了良好的应用效果。
There is huge gas resource potential in the continental facies clastic reservoir of Xujiahe Formation in Upper Triassic of Sichuan Basin. In recent years, commercial gas flow has been got in central Sichuan, such as Hechuan and Guang'an etc. In the study area, Xujiahe gas reservoir is mainly lithologic gas reservoir and compound traps of lithologic-structural gas reservoir. The reservoirs are very heterogeneous horizontally and vertically, and most of them are thin interbedding with low porosity and low permeability. Moreover, the reservoir fluid contents are very complex, so it is very difficult to perform reservoir prediction and fluid detection. Aimed at this type of lithologic gas reservoir, prestack high-fidelity processing technique has been applied to obtain prestack gathers with high quality, then, prestack quantitative reservoir prediction technique, mainly including elastic parameter inversion, as well as hydrocarbon detection technique which integrates elastic multi-parameter method and expanded elastic impedance inversion have been applied to improve the accuracy of reservoir prediction and fluid detection, and good application effects have been achieved.
There is huge gas resource potential in the continental facies clastic reservoir of Xujiahe Formation in Upper Triassic of Sichuan Basin. In recent years, commercial gas flow has been got in central Sichuan, such as Hechuan and Guang'an etc. In the study area, Xujiahe gas reservoir is mainly lithologic gas reservoir and compound traps of lithologic-structural gas reservoir. The reservoirs are very heterogeneous horizontally and vertically, and most of them are thin interbedding with low porosity and low permeability. Moreover, the reservoir fluid contents are very complex, so it is very difficult to perform reservoir prediction and fluid detection. Aimed at this type of lithologic gas reservoir, prestack high-fidelity processing technique has been applied to obtain prestack gathers with high quality, then, prestack quantitative reservoir prediction technique, mainly including elastic parameter inversion, as well as hydrocarbon detection technique which integrates elastic multi-parameter method and expanded elastic impedance inversion have been applied to improve the accuracy of reservoir prediction and fluid detection, and good application effects have been achieved.
引文
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[2]曾青高,龚昌明,李俊良,等.川中地区须家河组气藏勘探成果及潜力分析[J].天然气工业,2009,29(6):13～18.
[3]李伟,邹才能,杨金利,等.四川盆地上三叠统须家河组气藏类型与富集高产主控因素[J].沉积学报,2010,28(5):1037～1045.
[4]杨威,谢增业,金惠,等.四川盆地上三叠统须家河组储层评价及天然气成藏机理[J].天然气工业,2010,20(12):10～15.
[5]中国石油勘探与生产分公司.低渗透砂岩气藏地震勘探关键技术及应用[M].北京:石油工业出版社,2009.
[6]Connolly P.Elastic impedance.The Leading Edge,1999,18(4):438～452.
[7]彭真明,李亚林,巫盛洪,等.碳酸盐岩储层多角度弹性阻抗流体识别方法[J].地球物理学报,2008,51(3):881～885.
[8]Whitcombe D N.Elastic impedance no rmalization.Geophysics,2002,67(1):60～62.
[9]Whitcombe D N.Extended elastic impedance for fluidand lithology prediction,Geo physics,20 02,67(1):63～67.
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