基于参考道的岩性识别与岩性剖面非线性反演
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摘要
江汉盆地BH地区已发现多个砂岩岩性油藏,需要开展岩性预测工作。应用基于参考道的岩性预测方法,预测了BH地区Y5井与W51井T5+4层位的岩性差异,预测结果与实际钻井结果吻合,表明该方法对岩性变化和砂岩尖灭敏感,适用于叠后地震资料的岩性定性研究。但此方法只能预测井点附近的岩性,在分析BH地区测井资料的基础上,提出非线性函数反演岩性剖面的方法,结合测井资料,建立密度和孔隙度之间的函数关系,在声阻抗反演的基础上反演岩性剖面,减少了常规岩性解释中物性参数值重叠时划分岩性的多解性。用该法直接反演BH地区Y6井附近地震测线的岩性剖面,结果得出目的层位置的岩性是粉砂岩与油浸泥岩,密度为中高值,孔隙度约16%。图4表2参11
Many lithologic sandstone reservoirs have been discovered in BH region, Jianghan Basin, and for which the lithology prediction should be used. The reference trace-based prediction for T 5+4 horizon in Well Y5 and Well W51 area of BH region is in agreement with fact of drilling, which shows that the reference trace-based method is sensitive to lithologic variation and sandstone pinchout and thus is suitable for qualitative lithology research of the poststack seismic data. The function between density and porosity is built up. And the method inverses the lithology profiles on base of acoustic impedance, decreasing multiresolution in conventional lithological interpretation when petrophysical parameters overlaid. The new method reveals that the lithology in target horizon of Well Y6 is siltstone and oil-cut shale with mid-high density value and the porosity value of about 16%.
Many lithologic sandstone reservoirs have been discovered in BH region, Jianghan Basin, and for which the lithology prediction should be used. The reference trace-based prediction for T 5+4 horizon in Well Y5 and Well W51 area of BH region is in agreement with fact of drilling, which shows that the reference trace-based method is sensitive to lithologic variation and sandstone pinchout and thus is suitable for qualitative lithology research of the poststack seismic data. The function between density and porosity is built up. And the method inverses the lithology profiles on base of acoustic impedance, decreasing multiresolution in conventional lithological interpretation when petrophysical parameters overlaid. The new method reveals that the lithology in target horizon of Well Y6 is siltstone and oil-cut shale with mid-high density value and the porosity value of about 16%.
引文
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[2]姚逢昌,甘利灯.地震反演的应用与限制[J].石油勘探与开发,2000,27(2):5356.
[3]贾承造,赵文智,等.岩性地层油气藏勘探研究的两项核心技术[J].石油勘探与开发,2004,31(3):39.
[4]张永刚.地震波阻抗反演技术的现状和发展[J].石油物探,2002,41(4):8590.
[5]邓林,杨绍国.岩性自动解释软件系统[J].石油勘探与开发,2003,30(5):5961.
[6]张应波,张骥东.地震岩性预测新方法探索[J].石油地球物理勘探,1999,34(6):711722.
[7]Alexander.地震解释中的参照法[A].美国勘探地球物理学会第65届年会译文集[C].北京:石油工业出版社,1996.103106.
[8]贺振华,黄德济,胡光岷,等.复杂油气藏地震波场特征方法理论及应用[M].成都:四川科学技术出版社,1999.218220.
[9]张建林,吴胜和,武军昌,等.应用随机模拟方法预测岩性圈闭[J].石油勘探与开发,2003,30(3):114116.
[10]孙喜新.埕北11油藏精细动态描述研究[J].石油勘探与开发,2003,30(5):6264.
[11]丛向元,彭碧群,李占林.高分辨率三维地震资料解释技术的应用[J].石油物探,2004,43(2):167170.
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