苏里格气田苏X井区盒8段砂体识别及含气性预测研究
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摘要
苏里格气田苏X井区盒8段储层非均质性强,常规预测方法效果差。为了进行研究区砂体识别及含气性预测,提出了一种综合叠前及叠后2类储层预测技术优势的联合预测方法。首先,应用叠后地震属性分析及岩性随机反演方法,进行了盒8段砂体识别,在此基础上,结合沉积特征分析确定了研究区盒8段的沉积微相展布规律;其次,借助地震子波吸收系数分析、AVO分析及叠前弹性参数反演3种方法得到含气性分析成果,在剖面上进行了异常点段的含气性解释;最后,综合盒8期沉积微相的平面分布特征及剖面上的含气性分析成果,对研究区含气有利区进行了综合评价。实际钻井结果表明:该联合预测方法较好地克服了单一常规预测方法的不足,有效地降低了预测结果的不确定性,取得了较佳的预测效果,为进一步的勘探开发部署提供了更为可靠的依据。
Reservoir of He-8 Member in SU X well block of Sulige gas field has strong heterogeneity,and conventional prediction methods is not satisfactory.Therefore,in order to identify sand body and predict gas bearing block in the research area,prestack and poststack reservoir prediction methods were used in the paper.Firstly,seismic attributes analysis and lithologic stochastic inversion were comprehensively used for sand body identification.On the basis of identification result and the analysis of the sedimentary characteristics,the distribution law of sedimentary microfacies of He-8 Member in the research area has been determined.Secondly,by comprehensively utilizing the results of seismic wavelet absorption coefficient analysis,AVO analysis and pre-stack elastic inversion,gas bearing potential for anomalies was interpreted on the section.Finally,combined with sedimentary microfacies distribution characteristic of He-8 Member and gas bearing analysis results,gas bearing block was synthetically evaluated.Drilling result shows that the multiple prediction method is good,complementing the disadvantages of each other,reducing the uncertainty of prediction results and providing a reliable basis for further development and deployment.
Reservoir of He-8 Member in SU X well block of Sulige gas field has strong heterogeneity,and conventional prediction methods is not satisfactory.Therefore,in order to identify sand body and predict gas bearing block in the research area,prestack and poststack reservoir prediction methods were used in the paper.Firstly,seismic attributes analysis and lithologic stochastic inversion were comprehensively used for sand body identification.On the basis of identification result and the analysis of the sedimentary characteristics,the distribution law of sedimentary microfacies of He-8 Member in the research area has been determined.Secondly,by comprehensively utilizing the results of seismic wavelet absorption coefficient analysis,AVO analysis and pre-stack elastic inversion,gas bearing potential for anomalies was interpreted on the section.Finally,combined with sedimentary microfacies distribution characteristic of He-8 Member and gas bearing analysis results,gas bearing block was synthetically evaluated.Drilling result shows that the multiple prediction method is good,complementing the disadvantages of each other,reducing the uncertainty of prediction results and providing a reliable basis for further development and deployment.
引文
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[2]He Bizhu,Zhou Jie,Wang Gonghuai.Use of multiple seismicattributes to predict reservoir information[J].Petroleum Geo-physical Exploration,2003,38(3):258-262.[何碧竹,周杰,汪功怀.利用多元地震属性预测储层信息[J].石油地球物理勘探,2003,38(3):258-262.]
[3]Vapnik V.The Nature of Statistical Learning Theory[M].NewYork:Springer,1999.
[4]Yan Hui,Zhang Xuegong,Li Yanda.The research of relation-ship between of least squares and support vector machines[J].Tsinghua University:Science Edition,2001,41(9):77-80.[阎辉,张学工,李衍达.支持向量机与最小二乘法的关系研究[J].清华大学学报:自然科学版,2001,41(9):77-80.]
[5]Li Fangming,Ji Zhifeng,Zhao Guoliang,et al.Methodology andapplication of stochastic seismic inversion:A case from P oil-field,M basin,Sudan[J].Petroleum Exploration and Develop-ment,2007,34(4):451-455.[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,2007,34(4):451-455.]
[6]Zou Xinning,Sun Wei,Wang Daxing,et al.The reservoir pre-diction of low permeability sandstone in Sulige gas field[J].Ge-ophysical Prospecting for Petrolem,2005,44(6):621-623.[邹新宁,孙卫,王大兴,等.苏里格气田盒8段低渗砂岩储层的预测[J].石油物探,2005,44(6):621-623.]
[7]Li Linggao,Gan Lideng,Du Wenhui,et al.Pre-stack seismic in-version applied to reservoir prediction and natural gas detectionin Sulige gas field[J].Natural Gas Geoscience,2008,19(2):261-265.[李凌高,甘利灯,杜文辉,等.叠前地震反演在苏里格气田储层识别和含气性检测中的应用[J].天然气地球科学,2008,19(2):261-265.]
[8]Chen Fengxi,Wang Yong,Zhang Ji,et al.He-8 reservoir′s fa-vourable development blocks in Sulige gasfield,Ordos basin[J].Natural Gas Geoscience,2009,20(1):94-99.[陈凤喜,王勇,张吉,等.鄂尔多斯盆地苏里格气田盒8气藏开发有利区块优选研究[J].天然气地球科学,2009,20(1):94-99.]
[9]Liu Wenhui,Xu Yongchang.Geochemistry of natual gas and crudecomputation of gas-generated contribution for various source rocksin Sulige gas field Ordos basin[J].Natural Gas Geoscience,2007,18(5):697-702.[刘文汇,徐永昌.苏里格气田天然气运移和气源分析[J].天然气地球科学,2007,18(5):697-702.]
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