地震属性技术在北乌斯丘尔特盆地侏罗系泥岩预测中的应用
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摘要
北乌斯丘尔特盆地为大陆多旋回—克拉通盆地,其侏罗系地层发育了良好的烃源岩建造。由于研究区块勘探程度非常低,加之岩相古地理认识不清,给烃源岩评价造成了很大困难。针对这一问题,在对研究区地质背景进行分析的基础上,提出了运用地震属性技术对泥岩含量进行预测的方法。利用Landmark软件提取了11种地震属性,并对属性间的相关性及属性与泥岩含量间的敏感性逐一进行分析,优选出均方根振幅、弧线长度和最大谷值振幅3种对泥岩含量最敏感的属性。通过多元线性回归的方法建立了研究区泥岩含量预测模型,从而预测了其侏罗系泥岩含量及分布。经验证,预测结果与钻井吻合程度较好。最终,指出了有利泥岩发育区带,为下一步勘探提供了可靠的科学依据。
North Ustyurt Basin is a continent polycyclic-cratonic basin,its Jurassic strata developed several good sets of source rocks.Because of low exploration activity and unclear understanding of the lithofacies palaeogeography of the study area,the evaluation for source rocks is facing great difficulties.In order to solve this problem,a method using seismic attributes technique to predict mudstone content is presented,based on the analysis of regional geological background of the study area.11 kinds of seismic attributes are extracted by Landmark according to the seismic data in exploration area.Through analysis of the correlation and sensitivity of the seismic attributes,three attributes such as RMS Amplitude,Arc Length and Maximum Trough Amplitude which are most sensitive to mudstone content are selected as the analysis parameters of prediction models of mudstone content.Accordingly,by the theory of multiple linear regression,we put forward a model predicting the content and distribution of the mudstone of Jurassic in the study area.After verification,the prediction from the model matches well with the drilling data.Finally,the favorable mudstone zones in the exploration area is indicated,there is no doubt that this study will provide reliable foundation for further exploration in the study area.
North Ustyurt Basin is a continent polycyclic-cratonic basin,its Jurassic strata developed several good sets of source rocks.Because of low exploration activity and unclear understanding of the lithofacies palaeogeography of the study area,the evaluation for source rocks is facing great difficulties.In order to solve this problem,a method using seismic attributes technique to predict mudstone content is presented,based on the analysis of regional geological background of the study area.11 kinds of seismic attributes are extracted by Landmark according to the seismic data in exploration area.Through analysis of the correlation and sensitivity of the seismic attributes,three attributes such as RMS Amplitude,Arc Length and Maximum Trough Amplitude which are most sensitive to mudstone content are selected as the analysis parameters of prediction models of mudstone content.Accordingly,by the theory of multiple linear regression,we put forward a model predicting the content and distribution of the mudstone of Jurassic in the study area.After verification,the prediction from the model matches well with the drilling data.Finally,the favorable mudstone zones in the exploration area is indicated,there is no doubt that this study will provide reliable foundation for further exploration in the study area.
引文
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[4]徐旺林,王天琦,等.沿层属性分析在储层研究中的应用[J].石油地球物理勘探,2002,37(增刊):83-87.
[5]陈军,陈岩.地震属性分析在储层预测中的应用[J].石油物探,2001,40(3):94-99.
[6]王玉梅,季玉新,李东波,等.应用地震属性技术预测A地区储层[J].石油物探,2001,40(4):69-76.
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