基于非结构化网格的离散裂缝建模技术研究
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摘要
裂缝油藏由于裂缝的复杂性,基于结构化网格的建模及数模技术难以准确表征其渗流规律,且网格数量大、运算效率低。针对离散裂缝薄层模型,提出了基于非结构化网格的分层三棱柱网格生成方法,利用大尺度裂缝作为约束,建立全三维非结构化网格模型。根据锦州25-1南太古宇变质岩潜山油藏的具体情况,进行基质系统属性参数建模和中小尺度裂缝系统等效属性参数建模,然后进行基于联通表的离散裂缝数值模拟和历史拟合。结果表明,所建地质模型的拟合效果比结构化网格模型好,更加接近生产实际。
For buried hill fracture reservoir,because of its complexity,the traditional geological modeling and mathematical simulation based on structured grid technology can't accurately characterize seepage law of the complicated reservoir,and the grid number of traditional model is very big,so its computational efficiency is low. This paper puts forward a kind of discrete fracture network model based on unstructured grid technology. The core of the technology is the use of large scale fractures as constraints,and the full 3D unstructured grid model is established. According to the specific conditions of Jinzhou 25-1 South Archean metamorphic buried hill reservoir,models of attributes of matrix system and equivalent attributes of small and middle scale fractures are set up. Discrete fracture numerical simulation and historical fitting based on connected table are carried out. The research shows that fitting effect of the geological model based on the new method is closer to the actual production.
For buried hill fracture reservoir,because of its complexity,the traditional geological modeling and mathematical simulation based on structured grid technology can't accurately characterize seepage law of the complicated reservoir,and the grid number of traditional model is very big,so its computational efficiency is low. This paper puts forward a kind of discrete fracture network model based on unstructured grid technology. The core of the technology is the use of large scale fractures as constraints,and the full 3D unstructured grid model is established. According to the specific conditions of Jinzhou 25-1 South Archean metamorphic buried hill reservoir,models of attributes of matrix system and equivalent attributes of small and middle scale fractures are set up. Discrete fracture numerical simulation and historical fitting based on connected table are carried out. The research shows that fitting effect of the geological model based on the new method is closer to the actual production.
引文
[1] KARIMI-FARD M,DURLOFSKY L J,AZIZ K. An Efficient Discrete Fracture Model Applicable for General-Purpose Reservoir Simulators[J]. SPE Journal,2004,9(2):227-236.
[2] MATTHAI S K,MEZENTSEV A,BELAYNEH M. ControlVolume Finite-Element Two-Phase Flow Experiments With Fractured Rock Represented by Unstructured 3D Hybrid Meshes[G]. SPE 93341,2005.
[3]吕坐彬,赵春明,霍春亮,等.裂缝性潜山变质岩储层地质建模方法研究:以锦州25-1S潜山为例[J].科技导报,2010,28(13):68-72.
[4]周心怀,项华,于水,等.渤海锦州25-1南变质岩潜山油藏储集层特征与发育控制因素[J].石油勘探与开发,2005,32(6):17-20.
[5]童凯军,赵春明,吕坐彬,等.渤海变质岩潜山油藏储集层综合评价与裂缝表征[J].石油勘探与开发,2012,39(1):56-63.
[2] MATTHAI S K,MEZENTSEV A,BELAYNEH M. ControlVolume Finite-Element Two-Phase Flow Experiments With Fractured Rock Represented by Unstructured 3D Hybrid Meshes[G]. SPE 93341,2005.
[3]吕坐彬,赵春明,霍春亮,等.裂缝性潜山变质岩储层地质建模方法研究:以锦州25-1S潜山为例[J].科技导报,2010,28(13):68-72.
[4]周心怀,项华,于水,等.渤海锦州25-1南变质岩潜山油藏储集层特征与发育控制因素[J].石油勘探与开发,2005,32(6):17-20.
[5]童凯军,赵春明,吕坐彬,等.渤海变质岩潜山油藏储集层综合评价与裂缝表征[J].石油勘探与开发,2012,39(1):56-63.