随机反演在薄储层预测中的应用——以长岭断陷登娄库组为例
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摘要
对储层薄、砂泥岩速度差异小的地区的油气预测一直是地球物理勘探开发的一个难题。利用常规波阻抗反演进行油气预测已不能满足实际生产开发需要,而随机地震反演充分考虑地质规律、地震和测井信息,突破地震频带宽度的限制,具有较高的描述能力和分辨能力,能为储层描述提供更加丰富可靠的信息。本文以长岭断陷登娄库组为研究对象,通过岩石物理分析,得到储层电性、岩性、物理特征。利用随机反演技术对储层进行研究,认为反演结果对砂体有很好的反映。研究结果表明,随机地质统计反演能够用于岩性油气藏预测,为薄储层的研究拓宽了思路。
The oil & gas prediction in the area where the reservoirs are thin and velocity contrast between the sandstone and mudstone is little which is always a problem for geophysical exploration & development. It can’t meet the needs of the actual production and development that the oil & gas prediction is predicted by the conventional impedance inversion, The stochastic seismic inversion, which fully give consideration to the geological rules, seismic and log information, has broken through the limitation of the seismic bandwidth and has strong to description ability and resolution ability, can provides more reliable and richer information for reservoir characterization. Taking the area in Changling fault depression as a target, the electric properties, lithologies and physical characteristics of the reservoir are got by petrophysical analysis. The reservoirs are analyzed by the stochastic inversion, and the sand bodies are reflected more exactly. The findings shows that the stochastic geostatistical inversion can be used to predict the lithologic reservoirs, and broaden the thoughts to study the thin-reservoirs.
The oil & gas prediction in the area where the reservoirs are thin and velocity contrast between the sandstone and mudstone is little which is always a problem for geophysical exploration & development. It can’t meet the needs of the actual production and development that the oil & gas prediction is predicted by the conventional impedance inversion, The stochastic seismic inversion, which fully give consideration to the geological rules, seismic and log information, has broken through the limitation of the seismic bandwidth and has strong to description ability and resolution ability, can provides more reliable and richer information for reservoir characterization. Taking the area in Changling fault depression as a target, the electric properties, lithologies and physical characteristics of the reservoir are got by petrophysical analysis. The reservoirs are analyzed by the stochastic inversion, and the sand bodies are reflected more exactly. The findings shows that the stochastic geostatistical inversion can be used to predict the lithologic reservoirs, and broaden the thoughts to study the thin-reservoirs.
引文
[1]李晶秋,苗宏伟,李立立等.松辽盆地南部长岭断陷深层碎屑岩天然气成藏特征及主控因素[J].石油地质,2009,4(8):34-39
[2]杨敏芳,杨瑞召.随机岩性反演在茂兴地区薄地层预测中的应用[J].石油天然气学报,2009,31(3):222-225
[3]王延光.储层地震反演方法及应用中的关键问题与对策[J].石油物探,2002,41(3):299-303
[4]李方明,计智锋,赵国良等.地质统计反演之随机地震反演方法——以苏丹M盆地P油田为例[J].石油勘探与开发,2007,3(4):451-455
[5]刘兴东.随机反演变差函数适用性研究[J].石油天然气学报,2010,32(2):253-256
[2]杨敏芳,杨瑞召.随机岩性反演在茂兴地区薄地层预测中的应用[J].石油天然气学报,2009,31(3):222-225
[3]王延光.储层地震反演方法及应用中的关键问题与对策[J].石油物探,2002,41(3):299-303
[4]李方明,计智锋,赵国良等.地质统计反演之随机地震反演方法——以苏丹M盆地P油田为例[J].石油勘探与开发,2007,3(4):451-455
[5]刘兴东.随机反演变差函数适用性研究[J].石油天然气学报,2010,32(2):253-256
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