方位P波裂缝检测技术在川东北裂缝型储层中的应用
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摘要
裂缝是油气运移和聚集的重要场所。在川东北TNL地区发现的天然气藏主要为深埋的裂缝性气藏。本文利用叠前保幅处理的三维地震资料,在建立岩石物理正演模型的基础上,参考应力场分析结果以川东北TNL地区嘉陵江组二段裂缝型储层为例,对利用叠前地震方位P波技术进行裂缝检测进行了讨论,并归纳了相应的检测流程。检测结果表明,该区存在两条北东向和一条北西向断层发育带,裂缝主要发育在北东向应力与北西向应力交错部位。
The fracture is important place for oil&gas migration and accumulation. The most gas reservoirs found in TNL area in Northeast Sichuan are deep fracture gas reservoirs. In this paper by utilizing the 3d pre-stack amplitude preservation processed seismic data, based on established rock physics forward model and by referring to the results of the stress field analysis, the application of pre-stack seismic azimuthal P-wave in the fracture detection was discussed for the fracture reservoir in second section of Jialingjiang formation in TNL area of Northeast Sichuan, and corresponding detection flowchart was summarized. The detection results show that two NE fault development zones and one NW fault development zone were developed in this area, and the fractures were mainly developed in the interleaving zone of NE stress and NW stress.
The fracture is important place for oil&gas migration and accumulation. The most gas reservoirs found in TNL area in Northeast Sichuan are deep fracture gas reservoirs. In this paper by utilizing the 3d pre-stack amplitude preservation processed seismic data, based on established rock physics forward model and by referring to the results of the stress field analysis, the application of pre-stack seismic azimuthal P-wave in the fracture detection was discussed for the fracture reservoir in second section of Jialingjiang formation in TNL area of Northeast Sichuan, and corresponding detection flowchart was summarized. The detection results show that two NE fault development zones and one NW fault development zone were developed in this area, and the fractures were mainly developed in the interleaving zone of NE stress and NW stress.
引文
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[2]陈佳梁,兰素清等.裂缝性储层的预测方法及应用.勘探地球物理进展,2004,27(1):35~41
[3]Rger A.Variation of P-wave reflectivity with offset and azi muth in anisotropic media.Geophysics,1998,63(3):935~947
[4]王炯祥,刘大成,周志军.通南巴构造带嘉二段油气勘探目标选择及开发意义.天然气勘探与开发,2005,28(2):9~10
[5]Rger A.Using AVO for fracture detection:analytic basis and practical solutions.The Leading Edge,1997,16(10):1429~1430,1432~1434
[6]巫芙蓉.裂缝地震检测技术在四川BMM地区的应用.美国EPT公司中国用户论文集,2005
[7]殷八斤.AVO技术的理论与实践.北京:石油工业出版社,1995
[8]阴可,杨慧珠.各向异性介质中的AVO.地球物理学报,1998,41(3):282~391
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