地震技术在复杂岩性油藏勘探与开发中的综合应用——以涠洲12-1油田北块为例

THE COMPREHENSIVE APPLICATION OF SEISMIC TECHNIQUES TO EXPLORATION AND DEVELOPMENT OF COMPLICATED LITHOLOGIC OIL RESERVOIR

针对涠洲12-1油田北块断层非常复杂,又属陆相沉积,油层薄,砂体物性横向非均质性强等问题,文中总结出了一套适于复杂岩性油藏勘探与开发的地震技术工作流程,并在涠洲12-1油田北块进行了应用.结果表明,应用三维可视化技术、属性分析技术和方差体技术可以有效解决本区的断层解释问题以及沉积模式及油藏类型等问题;在资料条件有限的情况下,应用全三维解释技术、正演模拟技术和三维地质建模技术可以对含油砂体的空间几何形态进行精细雕刻,预测储层砂体物性的横向变化,并以三维可视化技术为依托获得储层砂体的有效孔隙体积,从而为本区勘探方向的选择、开发储量的计算以及ODP方案的制定奠定了基础.

Aiming at several problems such as complicated faults, continental deposits, thin oil reservoirs and high heterogeneity of sandbodies, a working flow of seismic techniques suitable for exploration and development of complicated lithologic reservoirs is developed and applied in the north block in WZ12?1 oilfield. The results have proved that fault interpretation, sedimentation modeling and reservoir_type determination can be effectively solved with 3D visualization, attribute analyzing and variance cube techniques. Under a condition of limited data, the geometrical shape of oil_bearing sandbodies can be precisely described with full 3D interpretation, forward modeling and 3D geological modeling techniques, predicting the lateral changes of reservoir petrophysics and obtaining the effective pore volume of reservoir sandbodies based on the 3D visualization technique. These works have laid a foundation for selecting exploration direction, calculating development reserves and working out oilfield development plan.