复杂断块YG油田挖潜增产潜力评价及应用

Evaluation and Application of Potential Development and Production Increase in YG Oilfield of Complex Fault Block

摘要: 为了评价海外生产近30年的复杂断块砂岩老油田是否还具有开发潜力，储备该类油田在生产后期高含水、低压、气举下的挖潜开发生产技术，做好现代油田管理，本文分析了英国北海复杂断块砂岩YG油田的地震资料问题，油藏流体连通性问题，以及主力油层动用程度高、采出程度高、剩余油分布复杂、稳产难度大等生产问题，提出了增产挖潜措施：1) 新采集地震资料，提高断层图像；2) 通过对复杂断块YG油田断层连通性研究(包括断距–储层厚度关系对比，示踪剂监测，井间干扰压力测试，流线分析，地球化学色谱指纹)，进行油藏流体连通性研究；3) 动态监测分析，数模研究，确定了开发潜力。最后找到了断块II南部的微构造、东南高部位区，断块I东北等6个剩余油分布区，总结了一套适合该地区评价老油田剩余油分布的3种类型和主要的4类挖潜方式。剩余油分布特点是：1) 平面上主要分布在局部构造高部位或微构造高点、断层遮挡区、非主流线弱驱替区；2) 纵向上层间主要分布在未动用层、局部动用差的层、受高含水层(段)干扰的其他层(段)；3) 层内主要分布在受韵律、夹层控制的层内动用不均区。挖潜方式：1) 通过补射孔来动用纵向潜力层；2) 通过新钻调整井，来挖潜平面上的剩余油区；3) 恢复注水，解决低压井等生产问题；4) 其他常规措施，包括加深气举阀，解堵增产等。

Abstract: In order to evaluate the overseas production of nearly 30 years old and complex fault block sandstone oilfield has or hasn’t the development potential, and reserve development and production technology in the low pressure, high water cut oil field, the problems of seismic data, fluid connectivity of reservoir, high production degree of main oil layer, high recovery degree, complex distribution of remaining oil and difficulty in stable production of complex fault block sandstone YG oilfield in North Sea, UK are analyzed in this paper. The measures for increasing production and exploiting potential are proposed as follows: 1) Acquire new seismic data to improve fault image; 2) Study on reservoir connectivity. Through the study on the fault connectivity of complex fault block YG oilfield, including the correlation between fault spacing and reservoir thickness, tracer monitoring, pressure test of inter well interference, streamline analysis, geochemical chromatography fingerprint, dynamic monitoring analysis, and reservoir simulation study, six remaining oil distribution areas were found, including the southern microstructure of fault block II, the southeast high area, and the northeast of fault block I. Three remaining oil distribution types and four increasing production methods in this area were summed up. The characteristics of the remaining oil distribution are: 1) On the plane, it is mainly distributed in local tectonic high parts or microstructural high parts, fault shading areas and weak displacement areas of non-mainstream lines; 2) The vertical layer is mainly distributed in the unutilized layer, the layer with poor local utilization, and other layers (sections) disturbed by high aquifers (sections); 3) The area in layer is mainly distributed in the uneven using zone controlled by rhythm and interlayer. The potential exploration methods are: 1) Use vertical potential layer by supplementary perforation; 2) Drill adjustment wells to excavate the remaining oil area on the potential plane; 3) Restore water injection to solve production problems in low-pressure area; 4) Other conventional measures including deepening of gas lift valves, plugging and stimulation.