高温高压潜山油藏开发的经验与教训

Xianbo Luo, Zhiqiang Zhu, Baolin Yue, Hongfu Shi, Yifan He
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摘要

Z油田是渤海湾盆地近年来首次开发的太古代潜山油藏。为了在有限井条件下开发海上变质潜山油藏,在实施总体开发规划的过程中,提出了几种解决方案。裂缝的表征与定量描述:利用地震正演模拟识别地震属性与裂缝的关系。结果表明,叠前横波阻抗反演可以预测有利的储层发育,不同频率特性可以探测裂缝。在此基础上,开展了基于岩石物性的岩石应力场模拟,研究了裂缝走向、裂缝体系的详细表征,定量预测了裂缝孔隙度等优质储层空间分布。通过综合物理模拟、数值模拟等资料,研究了裂缝-基质双体系潜山油藏的发育机理。为了最大限度地提高采收率,提出了一种新的注采模式PT-IB(开采井在山顶,注入井在山底)。提出了一种利用流场周期性变化来避免注入水沿裂缝窜流和扩大波及效率的新方法。提出了基于改进的水油比和水油比导数曲线进行水窜预警和判断的方案。
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The Experiences and Lessons Learned from the Development of High Temperature and High Pressure Buried Hillss Reservoir
The Archean buried hillss reservoir of Z Oilfield is the first one developed in the Bohai Bay Basin in recent years. In order to develop the offshore metamorphic buried hillss reservoir with limited wells, several solutions were present in the process of ODP (Overall Development Plan) implementation. The characterization and quantitative description of fracture: The seismic forward modeling was used to identify the relationship between seismic attributes and fracture. The results showed that pre-stack shear wave impedance inversion could predict favorable reservoir development and the different frequency properties could detect the fracture. Furthermore, the rock stress field simulation based on rock physical properties was implemented to study the direction of fracture, the detailed characterization of fractured system, the quantitative prediction of high quality reservoir space distribution including porosity of fracture. This paper studied the development mechanism of buried hills reservoir with double system-fracture and matrix by comprehensive physical simulation, numerical simulation and other data. A new injection-production pattern named PT-IB (produced wells on the top of hills and injected wells in the bottom of hills) was proposed to maximize recovery factor. A new method was adopted to avoid the injected water channeling along the fractures and to enlarge the sweep efficiency by periodic change flow field. This paper also put forward a plan about early warning and judging the water channeling based on improved water oil ratio and water oil ratio derivative curve.
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