曲线重构反演在火成岩储层预测中的应用
摘要
苏北盆地海安凹陷四灶地区阜宁组火成岩发育,但火成岩分布复杂,地震资料品质较差,声波时差曲线对火成岩及其变质带和碎屑岩的反映不明显,火成岩储层预测难度大.针对研究区的特点选取了曲线重构反演来预测火成岩储层.通过对研究区多口井测井曲线的统计分析,优选出能够有效区分火成岩与碎屑岩的GR曲线进行重构,利用GR曲线重构建立的拟阻抗初始约束模型与实际地质规律的吻合程度明显高于用原始曲线建立的模型,GR反演成果所描述的火成岩分布特征与实际的地质分析和认识吻合也较好,说明曲线重构技术在本次反演中起了积极而有效的作用.利用该反演结果,结合目标区的地质认识和实际钻井、测井资料,对火成岩储集层进行了综合描述,描述8个火成岩控制的圈闭,预测6个新圈闭.
Igneous rocks are very developed in the main exploration object layers of Funing Formation in Sizao region,Haian Sag,Subei Basin.However the distribution of the igneous rocks is complex,the quality of seismic data is worse.The igneous rock,its metamorphic zone and clastic rock cann't be apparently reflected on acoustic slowness logging curve,and therefore it is difficult to predict the igneous reservoirs.In accordance with the characters of the studied area,some logging curves can be selected through statistic analysis of the logging curves of several wells in the area and reconstructed on which the igneous rock and clastic rock can be effectively distinguished.The fitting degree between the pseudo-impedance model established based on the reconstructed logging curves and real geological regulation is higher than that between the model established based on original logging curves and real geological regulation.Distribution character of igneous rock described by GR inversion fitted together with real geological analyses and recognition fairly good too.Those indicated that log rebuilding technique affected positively and availably in the inversion of igneous rock.On base of this inversion result,Synthetical description of igneous reservoir was done combining with geological recognition and real drilling and logging data of target area.Eight traps controlled by igneous rock were described and six new traps were predicted.This study provided reliable reference material in next step exploration of this area.
Igneous rocks are very developed in the main exploration object layers of Funing Formation in Sizao region,Haian Sag,Subei Basin.However the distribution of the igneous rocks is complex,the quality of seismic data is worse.The igneous rock,its metamorphic zone and clastic rock cann't be apparently reflected on acoustic slowness logging curve,and therefore it is difficult to predict the igneous reservoirs.In accordance with the characters of the studied area,some logging curves can be selected through statistic analysis of the logging curves of several wells in the area and reconstructed on which the igneous rock and clastic rock can be effectively distinguished.The fitting degree between the pseudo-impedance model established based on the reconstructed logging curves and real geological regulation is higher than that between the model established based on original logging curves and real geological regulation.Distribution character of igneous rock described by GR inversion fitted together with real geological analyses and recognition fairly good too.Those indicated that log rebuilding technique affected positively and availably in the inversion of igneous rock.On base of this inversion result,Synthetical description of igneous reservoir was done combining with geological recognition and real drilling and logging data of target area.Eight traps controlled by igneous rock were described and six new traps were predicted.This study provided reliable reference material in next step exploration of this area.
引文
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[8]吕希学,肖焕钦,刘惠民,等.根据地震勘查信息预测火成岩储集体[J].浙江大学学报:工学版,2003,37(2):249-253.
[2]许正龙.曲线重构技术在储层横向预测工作中的应用[J].石油实验地质,2002,24(4):377-384.
[3]张学芳,董月昌,慎国强,等.曲线重构技术在测井约束反演中的应用[J].石油勘探与开发,2005,32(3):70-72.
[4]刘百红,郑四连,关达.拟声波宽带约束波阻抗反演在储层预测中的应用[J].勘探地球物理进展,2005,28(6):416-421.
[5]王玉学,汤达祯,龚建华,等.拟声波反演技术在储层预测中的应用:以吐哈盆地台北凹陷胜北地区白垩系为例[J].石油实验地质,2004,26(3):303-307.
[6]石磊,王昌景.利用拟声波曲线进行高分辨率地震反演[J].西南石油学院学报,2004,26(5):18-20.
[7]严慧中,刘学敏,蔡文涛,等.火成岩储层地震综合技术的应用[J].石油地球物理勘探,1999,34:89-95.
[8]吕希学,肖焕钦,刘惠民,等.根据地震勘查信息预测火成岩储集体[J].浙江大学学报:工学版,2003,37(2):249-253.
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