摘要
实际勘探表明页岩储层中往往背景呈现出很细的水平层理,垂直裂缝出现在多组页岩细层中,这种裂缝储层结构不能用传统的HTI模型来准确描述,但是可以用正交各向异性介质很好的描述.因此,本文开展正交各向异性介质裂缝预测方法研究.首先,简化正交各向异性介质反射系数近似表达式;其次,从理论角度分析椭圆拟合方法的局限性,以及不同裂缝流体类型填充时正交各向异性介质AVAZ属性受垂直缝、水平缝和流体指示因子的影响,分析对裂缝发育强度敏感的AVAZ属性;最后,针对页岩油储层和页岩气储层分别建立预测微裂缝发育强度的方法,并在页岩油气储层进行了应用测试.理论分析和应用测试结果表明新方法提高了页岩储层微裂缝发育强度的预测精度.
The real exploration shows that background of shale reservoir always presents very fine horizontal lamination, and vertical fractures present in several sets of horizontal lamination. This fracture reservoir structure can’t be accurately described by HTI media, but it can be described by orthorhombic anisotropy media very well. That’s why we develop research on fracture predicting for orthorhombic anisotropy media. Firstly, simplify reflection coefficient approximation of orthorhombic anisotropy media. Secondly, theoretically analysis the limitation of ellipse fitting, and AVAZ attributes of OA media influenced by vertical fractures, horizontal fractures and fluid property indicator when fractures filled with different fluid type. Then analysis the sensitive of AVAZ attributes with fracture intensity. Finally, develop fracture intensity predicting method for shale oil and gas reservoirs, respectively, and do application test in shale oil or gas reservoir. Both theories analysis and application test show that new method enhanced precision of fracture intensity prediction intensity.
作者
刘宇巍
LIU YuWei(National Key Laboratory of Corporation of Shale Oil/Gas Enrichment Mechanism and Effective Development,Beijing 102206,China;National Energy R&D Center of Shale Oil,Beijing 102206,China;SinoPEC Key Laboratory of Shale Oil/Gas Exploration and Production Technology,Beijing 102206,China;SinoPEC Petroleum Exploration and Production Research Institute,Beijing 102206,China)
出处
《地球物理学进展》
CSCD
北大核心
2022年第5期2001-2009,共9页
Progress in Geophysics
基金
国家科技重大专项(2017ZX05049-002)
中国石化科技项目(P20056-3)联合资助。
