临兴中区产能建设关键技术

Key Production Capacity Construction Technology in Central Linxing Area

摘要: 临兴中气田储层厚度薄、致密、非均质性强，三维地震分辨率有限，砂、泥、煤、灰互层，传统的叠前同时反演对于有效储层预测符合率普遍偏低，无法精确刻画单砂体，井网部署不合理造成储量动用率偏低，增产改造工艺与地质情况不匹配造成部分井压后产能低于地质预期，产能建设存在瓶颈期。针对以上问题，通过地质、地球物理及工程多学科联合攻关，认为相控下的叠前地质统计学反演约束下的储层三维地质建模工作可以较准确地刻画含气砂体的范围和边界，其预测符合率可达到87%以上，在该结果指导下的差异化井位部署可以提高地质储量的动用程度，同一砂体实现同步动用，提高单井采收率；通过岩性结合脆性、裂缝等可压性指标对直定向井及水平井段射孔长度及位置进行优化，降低了压裂的难度，提高了单井的改造效果。相控储层地质建模指导下的差异化井位部署技术结合地质工程一体化的压裂改造技术，提高了区块开发效益，同时也加速了临兴中区产能建设的步伐。

Abstract: The gas field in central Linxing area is characterized by thin, dense and heterogeneous reservoir, limited 3D seismic resolution, interbedded sand, mud, coal and ash, low coincidence rate of traditional pre stack simultaneous inversion for effective reservoir prediction, inability to accurately depict single sand body, low reservoir production rate due to unreasonable well pattern deployment, mismatch between stimulation and geological conditions, and low production after partial well pressure. According to geological expectation, there is a bottleneck period in capacity construction. In view of the above problems, through the joint research of geology, geophysics and engineering, it is considered that the 3D geological modeling of reservoir under the constraint of pre-stack geostatistics inversion under the control of facies can accurately depict the scope and boundary of gas bearing sand body, and the prediction coincidence rate can reach over 87%. The differential well location deployment under the guidance of this result can improve the utilization degree of geological reserves. The same sand body can be used synchronously to improve the recovery rate of single well; the perforation length and position of vertical directional well and horizontal well section can be optimized by combining the lithology with the compressibility indexes such as brittleness and fracture, which reduces the difficulty of fracturing and improves the reconstruction effect of single well. The differential well location deployment technology under the guidance of geological modeling of facies controlled reservoir, combined with the fracturing reconstruction technology integrated with geological engineering, improves the block development efficiency and accelerates the pace of production capacity construction in central Linxing area.