顺北油田超深断控缝洞型油藏注水开发实践

doi:10.7657/XJPG20230609

摘要/Abstract

摘要：

综合分析顺北油田超深断控缝洞型油藏地质与开发特征，确定了天然能量不足是目前导致顺北1号断裂带弱挥发性油藏产量快速递减及地层原油脱气的主要原因。采用数值模拟方法，明确了注水补能是目前最佳开发方式。研究结果表明：顺北油田超深断控缝洞型油藏注水重力分异作用是主要注水机理，注水能有效恢复地层能量；断裂带拉分段的水驱连通程度和能量平衡能力明显强于挤压段；超深断控缝洞型油藏注水开发具有沿断裂带快速水窜和水驱波及体积小的特征。通过注水，油藏地层压力平均恢复14.78 MPa，区块年递减率从48.6%降低到15.9%，阶段累计增油13.10×10⁴ t，取得了较好的开发效果。

关键词: 塔里木盆地, 顺北油田, 断控缝洞型油藏, 天然能量, 注水开发, 数值模拟, 注水机理, 重力分异

Abstract:

The geological and development characteristics of ultra-deep fault-controlled fractured-vuggy reservoirs in Shunbei oilfield were comprehensively analyzed, and insufficient natural energy was determined to be the main reason for the rapid production decline and formation oil degassing in the weakly volatile oil reservoirs in the Shunbei No.1 fault zone. Through numerical simulation, it is clarified that water injection is the optimal development method currently. The research results show that gravity differentiation is the main mechanism of water injection in the ultra-deep fault-controlled fractured-vuggy reservoirs in Shunbei oilfield, and water injection can effectively restore formation energy. The waterflooding connectivity and energy balance capability in the fault zone’s pull-apart segments are much stronger than those in the compression segments. Water injection development of the ultra-deep fault-controlled fractured-vuggy reservoirs features rapid water channeling along fault zone and small swept area. Water injection enables good development effect, with the reservoir pressure restored by 14.78 MPa averagely, the annual decline rate of the block decreasing from 48.6% to 15.9%, and the staged cumulative oil production increased by 13.10×10⁴ tons.

Key words: Tarim basin, Shunbei oilfield, fault-controlled fractured-vuggy reservoir, natural energy, water injection, numerical simulation, mechanism, gravity differentiation

中图分类号:

TE357.6

李小波, 魏学刚, 刘学利, 张艺晓, 李青. 顺北油田超深断控缝洞型油藏注水开发实践[J]. 新疆石油地质, 2023, 44(6): 702-710.

LI Xiaobo, WEI Xuegang, LIU Xueli, ZHANG Yixiao, LI Qing. Practice of Water Injection Development in Ultra-Deep Fault-Controlled Fractured-Vuggy Reservoirs in Shunbei Oilfield[J]. Xinjiang Petroleum Geology, 2023, 44(6): 702-710.

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