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基于层序地层学的地质统计学反演
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  • 英文篇名:Geostatistical inversion based on sequence stratigraphy
  • 作者:范廷恩 ; 马良涛 ; 胡光义 ; 田立新 ; 陈开远 ; 王宗俊
  • 英文作者:FAN Ting-en;MA Liang-tao;HU Guang-yi;TIAN Li-xin;CHEN Kai-yuan;WANG Zong-jun;CNOOC Research Institute Limited;Bohai Petroleum Institute,Tianjin Branch,CNOOC;China University of Geoscience( Beijing);
  • 关键词:层序地层学理论 ; 地质框架模型 ; 纵/横向变程 ; 岩性空间展布趋势 ; 地质统计学反演
  • 英文关键词:Sequence stratigraphy theory;;Geological framework model;;Longitudinal/lateral variation;;Lithology ratio;;Geostatistical inversion
  • 中文刊名:DQWJ
  • 英文刊名:Progress in Geophysics
  • 机构:中海油研究总院有限责任公司;中海石油(中国)有限公司天津分公司渤海石油研究院;中国地质大学(北京);
  • 出版日期:2018-07-25 18:39
  • 出版单位:地球物理学进展
  • 年:2019
  • 期:v.34;No.153
  • 基金:国家科技重大专项“海上开发地震关键技术及应用研究”项目(2011ZX05024-001)资助
  • 语种:中文;
  • 页:DQWJ201901011
  • 页数:10
  • CN:01
  • ISSN:11-2982/P
  • 分类号:86-95
摘要
地质统计学反演具有较高的空间分辨率,在薄储层预测中应用广泛,其反演精度受地质框架模型、纵/横向变程和岩性空间展布趋势的影响较大.传统地质框架模型、变程及岩性空间展布趋势的选取主要通过参数测试来实现,效率低,反演精度不高,并不能完全反应储层空间变化特征,尤其是对于储层横向变化较快的曲流河沉积,其储层叠置特征和空间展布特征刻画难度更大.为此,本文以渤海W油田为例,将层序地层学理论引入地质统计学反演中,以层序地层学理论为指导,建立精细的层序地层格架,并构建相应的地质框架模型,借助储层沉积学分析,进而开展层序地层格架约束下变程及地质框架模型约束下岩性空间展布趋势选取方式及其对反演精度影响的研究.研究认为,基于层序地层学选取反演参数效率高、精度高,所选参数地质含义明确;反演结果空间分辨率高,与井上信息吻合度更高,储层内部砂体的叠置特征及空间展布特征更加清晰,从而为油田开发提供了高品质数据支撑.
        At present, geostatistical inversion has been widely used in the thin reservoir predicting for its high transverse and longitudinal resolution. There are multiple factors for inversion accuracy, above all,the geological framework model, longitudinal/lateral variation and lithology ratio. However, the traditional method to build geological framework model and choose longitudinal/lateral variation and lithology ratio by testing is low efficiency. Besides, the inversion result can not completely describe reservoir characteristics precisely. Especially to meandering river sediments, it's more difficult to characterize its reservoir and spatial distribution feature for lithology fast changing on the transverse. Therefore, it's necessary to solve the problem that how chooses inversion parameters accurately and then improves spatial resolution of reservoir prediction to meet the needs of oilfield development on resolution. Taking W oilfield in Bohai for example,this paper introduces the sequence stratigraphy into geostatistical inversion for the first time. Sequence stratigraphy framework is built guided by the theory of sequence stratigraphy. Based on framework stratigraphy theory, the geological framework model is built. Combined with reservoir sedimentary features, it discusses how to choose longitudinal/lateral variation and lithology ratio under controlling by sequence stratigraphy and geological framework model, respectively. Besides, their influence on inversion precision are also analyzed. The result shows that the method, using sequence stratigraphy to guide the inversion parameters selection, has the following advantages: high efficiency, high precision and clear geological meaning for selected parameters; high resolution for inversion results, mostly in accordance with well information, accurately characterizing sand body superimposed within the reservoir and meeting accuracy requirement of reservoir characterization in development stage and it provides high quality data for oilfield development.
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