长垣外围扶杨油层注入水构成及注采比优化  

Optimization of injection water composition and injection-to-production ratio of Fuyang oil reservoirs in the outer area of Changyuan

作　　者：罗立娟 LUO Lijuan(No.10 Oil Production Plant of Daqing Oilfield Co.Ltd.,PetroChina,Daqing 166405,China)

机构地区：[1]中国石油大庆油田有限责任公司第十采油厂,黑龙江大庆166405

出　　处：《复杂油气藏》2022年第4期52-57,共6页Complex Hydrocarbon Reservoirs

基　　金：国家科技重大专项“大型油气田及煤层气开发”(2016ZX05013006)。

摘　　要：长垣外围扶杨油层为低、特低渗透性储层,骨架砂体主要为河道砂,部分区块裂缝相对发育,油田注采比高。从岩心观察和测井砂岩厚度解释着手,储层可分为有效砂岩和非有效砂岩。结合室内岩心吸水实验,证实非有效砂岩有一定的吸水能力。通过构建典型区块三维全地层地质模型,应用数值模拟技术量化区块的注入水构成,明确了高注采比主要是由非有效砂岩和非储层的吸水所致。应用最优理论方法,计算出低渗区块合理注采比为2.0~2.5,特低渗区块合理注采比为2.5~3.9。The Fuyang Formation in the outer area of Changyuan is a low and extra-low permeability reservoir,the skeletal sandbody is mainly river sandbody,some blocks have relatively developed fractures,and the oilfield has a high injection-to-production ratio.Starting from core observation and logging interpretation of sandstone thickness,the reservoir can be divided into effective sandstone and non-effective sandstone.Combined with the indoor core water absorption experiments,it is confirmed that the noneffective sandstone has a certain water absorption ability.By constructing a three-dimensional full stratigraphic geological model of a typical block and applying numerical simulation techniques to quantify the injection water composition of the block,it is clear that the high injection-to-production ratio is mainly caused by the water absorption of non-effective sandstone and non-reservoir.Applying the optimization theory method,a reasonable injection-to-production ratio is 2.0 to 2.5 for low permeability blocks and 2.5 to 3.9 for extralow permeability blocks,respectively.

关 键 词：低、特低渗透 注水构成 注采比 扶杨油层 

分 类 号：TE348[石油与天然气工程—油气田开发工程]