地震多参数反演技术在岩性圈闭识别中的应用——以B区块飞仙关组二段为例
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摘要
B区块下三叠统飞仙关组二段(T1f2)储层为中低孔、低渗气藏,具有分布广、厚度相对薄、非均质性强等特点,利用常规波阻抗反演较难分辨储层,给岩性圈闭的识别带来极大挑战。为此,深入开展了叠后地震多参数反演技术研究,在岩石物理分析的基础上,通过拟声波阻抗反演结合孔隙度反演,较好地区分了储层和围岩,精细刻画了岩性圈闭边界,在T1f2共识别出了与B27-B204-B205井区类似的10个岩性圈闭。实际钻探结果表明,叠后地震多参数反演技术在岩性圈闭识别中具有良好的应用前景。
The gas reservoir in the second member of Feixianguan Formation(T1f2)in Block B was distributed widely,which was characterized by middle to low porosity and low permeability with relatively thin thickness and strong heterogeneity.It was difficult to distinguish the reservoir by using conventional impedance inversion,which brought a great challenge to identify lithology traps.Therefore,the post-stack seismic multi-parameter inversion technology was researched in depth.Based on the petrophysical analysis,the pseudo acoustic impedance inversion was combined with porosity inversion was used for distinguishing the reservoirs from surrounding rocks and lithologic trap boundary was.Recognized.Through the technique,ten lithologic traps are identified in Wellblocks B27-B204-B205.The practical drilling result shows that the post-stack seismic multi-parameter inversion has good application prospects in identifying lithologic traps.
The gas reservoir in the second member of Feixianguan Formation(T1f2)in Block B was distributed widely,which was characterized by middle to low porosity and low permeability with relatively thin thickness and strong heterogeneity.It was difficult to distinguish the reservoir by using conventional impedance inversion,which brought a great challenge to identify lithology traps.Therefore,the post-stack seismic multi-parameter inversion technology was researched in depth.Based on the petrophysical analysis,the pseudo acoustic impedance inversion was combined with porosity inversion was used for distinguishing the reservoirs from surrounding rocks and lithologic trap boundary was.Recognized.Through the technique,ten lithologic traps are identified in Wellblocks B27-B204-B205.The practical drilling result shows that the post-stack seismic multi-parameter inversion has good application prospects in identifying lithologic traps.
引文
[1]马永生,郭旭升,凡睿.川东北普光气田飞仙关组鲕滩储集层预测[J].石油勘探与开发,2005,32(4):60~64.
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[3]刘小平,杨晓兰,曾忠玉,等.多参数联合反演在火成岩储集体预测中的应用[J].石油地球物理勘探,2007,42(1):44~49.
[4]王童奎,赵宝银,戴晓峰,等.叠前多属性概率神经网络反演储层孔隙度[J].物探化探计算技术,2013,35(2):162~167.
[2]郭彤楼.川东北地区飞仙关组鲕滩储层成岩作用[J].石油与天然气地质,2010,31(5):620~631.
[3]刘小平,杨晓兰,曾忠玉,等.多参数联合反演在火成岩储集体预测中的应用[J].石油地球物理勘探,2007,42(1):44~49.
[4]王童奎,赵宝银,戴晓峰,等.叠前多属性概率神经网络反演储层孔隙度[J].物探化探计算技术,2013,35(2):162~167.
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