高分辨率层序地层学在提高储集层预测精度中的应用
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摘要
为了提高岩性-地层油气藏勘探阶段储集层预测精度,以高分辨率层序地层学理论为基础,划分和建立层序地层格架,据此进行速度场研究、地震反演、地震属性分析,进行储集层预测。以准噶尔盆地腹部石南21井区侏罗系头屯河组辫状河三角洲油藏为例,在高分辨率等时地层格架内进行构造变速成图和储集层预测,大大提高了储集层预测的精度。通过与实钻结果的对比,在目的层埋深约为2500 m时,预测最大深度误差仅为10 m,平均相对预测误差仅为0.16%;平均有效砂岩厚度约为13 m的评价井,砂岩厚度预测误差最大仅为5 m。实践证明层序地层格架控制下的构造变速成图技术和储集层预测技术是提高储集层预测精度的有效技术。图11表2参14
On the basis of high-resolution sequence stratigraphy,this paper establishes a sequence stratigraphic frame,and predicts reservoirs by analyzing velocity field,seismic inversion,and seismic attributes.In the case study of the Jurassic Toutunhe Formation braided river delta reservoir of Shinan 21 well block,middle of the Junggar Basin,space variant velocity field inversion and reservoir prediction were carried out based on the sequence stratigraphic frame and the reservoir prediction accuracy was improved.Comparing the prediction results with the real drilling shows that,when the burial depth of bed of interest is 2 500 m,the maximum prediction error of depth is only 10 m,and the average relative prediction error is 0.16%;for appraisal wells with an average effective sandstone of 13 m,the maximum prediction error of sandstone thickness is only 5 m.The structure mapping and reservoir prediction constrained by the sequence stratigraphic frame achieved success.
On the basis of high-resolution sequence stratigraphy,this paper establishes a sequence stratigraphic frame,and predicts reservoirs by analyzing velocity field,seismic inversion,and seismic attributes.In the case study of the Jurassic Toutunhe Formation braided river delta reservoir of Shinan 21 well block,middle of the Junggar Basin,space variant velocity field inversion and reservoir prediction were carried out based on the sequence stratigraphic frame and the reservoir prediction accuracy was improved.Comparing the prediction results with the real drilling shows that,when the burial depth of bed of interest is 2 500 m,the maximum prediction error of depth is only 10 m,and the average relative prediction error is 0.16%;for appraisal wells with an average effective sandstone of 13 m,the maximum prediction error of sandstone thickness is only 5 m.The structure mapping and reservoir prediction constrained by the sequence stratigraphic frame achieved success.
引文
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[11]赵邦六.多分量地震勘探在岩性气藏勘探开发中的应用[J].石油勘探与开发,2008,35(4):397-409,423.Zhao Bangliu.Application of multi-component seismic explorationin the exploration and production of lithologic gas reservoirs[J].Petroleum Exploration and Development,2008,35(4):397-409,423.
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[14]姚逢昌,甘立灯.地震反演的应用与限制[J].石油勘探与开发,2000,27(2):53-56.Yao Fengchang,Gan Lideng.Application and restriction ofseismic inversion[J].Petroleum Exploration and Development,2000,27(2):53-56.
[2]向奎,鲍志东,庄文山.准噶尔盆地滩坝砂石油地质特征及勘探意义——以排2井沙湾组为例[J].石油勘探与开发,2008,35(2):195-200.Xiang Kui,Bao Zhidong,Zhuang Wenshan.Petroleum geologyand exploration of beach sandbar in Junggar Basin,NW China:Acase from the Shawan Formation in Well Pai 2[J].PetroleumExploration and Development,2008,35(2):195-200.
[3]潘元林.中国隐蔽油气藏[M].北京:地质出版社,1998.Pan Yuanlin.Subtle oil reservoirs in China[M].Beijing:Geological Publishing House,1998.
[4]贾承造,池英柳.第三届隐蔽油气藏国际学术研讨会论文集[C].北京:石油工业出版社,2004.Jia Chengzao,Chi Yingliu.The symposium of the 3thsubtle oilreservoirs international conference[C].Beijing:PetroleumIndustry Press,2004.
[5]贾承造,赵文智,邹才能,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):3-9.Jia Chengzao,Zhao Wenzhi,Zou Caineng,et al.Two keytechnologies about exploration of stratigraphic/lithologicalreservoirs[J].Petroleum Exploration and Development,2004,31(3):3-9.
[6]管树巍,李本亮,侯连华,等.准噶尔盆地西北缘下盘掩伏构造油气勘探新领域[J].石油勘探与开发,2008,35(1):17-22.Guan Shuwei,Li Benliang,Hou Lianhua,et al.Newhydrocarbon exploration areas in footwall covered structures innorthwestern margin of Junggar Basin[J].Petroleum Explorationand Development,2008,35(1):17-22.
[7]Cross T A,Lessenger M A.Sediment volume partitioning:Rational for stratigraphic model evaluation and high resolutionstratigraphic correlation[A].Gradstein F M,Sandvik K O,Milton N J,et al.Sequence stratigraphy concepts andapplications[C].Oslo:NPF Special Publication,1998.171-195.
[8]Cross T A,Baker M R.Applications of high-resolution sequence-stratigraphy to reservoir analysis[A].Eschard R,Doligez B.Subsurface reservoir characterization from outcrop observations[C].Paris:The 7thIFP Exploration and Production ResearchConference,1993.
[9]邓宏文.美国层序地层研究中的新学派——高分辨率层序地层学[J].石油与天然气地质,1995,16(2):89-97.Deng Hongwen.A new school of thought in sequencestratigraphic studies in U.S.:High resolution sequencestratigraphy[J].Oil&Gas Geology,1995,16(2):89-97.
[10]邓宏文,王红亮.高分辨率层序地层学——原理及应用[M].北京:地质出版社,2002.Deng Hongwen,Wang Hongliang.High resolution sequencestratigraphy:Theory and application[M].Beijing:GeologicalPublishing House,2002.
[11]赵邦六.多分量地震勘探在岩性气藏勘探开发中的应用[J].石油勘探与开发,2008,35(4):397-409,423.Zhao Bangliu.Application of multi-component seismic explorationin the exploration and production of lithologic gas reservoirs[J].Petroleum Exploration and Development,2008,35(4):397-409,423.
[12]李庆忠.走向精确勘探的道路[M].北京:石油工业出版社,2003.Li Qingzhong.The road to precision exploration[M].Beijing:Petroleum Industry Press,2003.
[13]刘雯林.油气田开发地震技术[M].北京:石油工业出版社,1996.Liu Wenlin.The seismic technology of oilfield development[M].Beijing:Petroleum Industry Press,1996.
[14]姚逢昌,甘立灯.地震反演的应用与限制[J].石油勘探与开发,2000,27(2):53-56.Yao Fengchang,Gan Lideng.Application and restriction ofseismic inversion[J].Petroleum Exploration and Development,2000,27(2):53-56.
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