S30断块注采优化调整研究

Research on Optimization and Adjustment of Injection and Production in S30 Fault Block

摘要: S30断块为典型窄条状中渗断鼻油藏，主力含油层系为阜宁组阜一段、阜二段，储层以滨浅湖滩坝沉积为主，具有含油带窄、注水后含水上升快、注采系统不匹配、储量动用不均等开发矛盾。本文以油藏精细描述为基础，开展构造、沉积、储层及三维地质建模研究，通过水驱开发效果评价、剩余油分布规律分析，明确合理注采井距、油水井数比、注采比等关键参数，针对性提出完善注采井网、分层注水、补孔改层、侧钻挖潜等综合治理对策。现场实施表明，优化调整后区块累计增油3261 t，综合含水下降14.0%，采油速度提高0.35%，研究成果可为同类窄条状中渗油藏高效开发提供技术借鉴。

Abstract: The S30 fault block is a typical narrow-strip, medium-permeability fault-nose reservoir. The main oil-bearing strata are the first and second sections of the Funing Formation. The reservoir is mainly composed of shallow lacustrine bar deposits, characterized by narrow oil-bearing zones, rapid water cut increase after water injection, mismatch between injection and production systems, and uneven utilization of reserves. Based on a detailed reservoir description, this paper conducts structural, sedimentary, reservoir, and 3D geological modeling studies. Through evaluation of waterflood development effects and analysis of remaining oil distribution patterns, key parameters such as reasonable injection-production well spacing, oil-water well ratio, and injection-production ratio are identified. Targeted comprehensive management strategies are proposed, including improving the injection-production well network, stratified water injection, perforation modification, and sidetracking for potential tapping. Field implementation showed that after optimization and adjustment, the block accumulated an additional 3261 tons of oil production, a 14.0% decrease in overall water cut, and a 0.35% increase in oil recovery rate. The research findings can provide technical guidance for the efficient development of similar narrow, medium-permeability reservoirs.