低孔隙度低渗透率储层复杂流体综合评价方法  

Comprehensive Evaluation Method for Complex Fluid in Low Porosity and Low Permeability Reservoirs

作　　者：郑炀 陆云龙 时新磊 朱猛 ZHENG Yang;LU Yunlong;SHI Xinlei;ZHU Meng(Tianjin Branch,China National Offshore Oil Corporation,Tianjin 300459,China)

机构地区：[1]中海石油(中国)有限公司天津分公司,天津300459

出　　处：《测井技术》2024年第4期548-557,共10页Well Logging Technology

基　　金：中海石油(中国)有限公司科技项目“渤海油田3000万吨持续稳产关键技术研究-渤海中深层复杂油气藏高效开发技术”(CNOOC-KJ135-ZDXM36-TJ-03-TJ)。

摘　　要：渤海LD油田目的层东三段发育低孔隙度低渗透率储层,其孔隙结构复杂,且储层流体地露压差小、溶解气油比高,导致油、气、水层的测井响应特征差异小。对比和分析经测试、测压、取样证实的油、气、水层的测井资料及录井资料,认为体积压缩系数与泊松比的交会幅度、视地层水电阻率、气测异常倍数及热解气相色谱对流体性质的响应较为敏感。基于上述4类参数,以经过测试、测压、取样等证实的70个油、气、水层为数据样本,其中51个作为训练样本,19个作为检验样本,采用支持向量机算法,建立了油、气、水层的流体判别模型。该方法在LD油田流体识别中取得较好的应用效果,流体性质识别符合率达89.4%,为该油田的储量评价奠定了基础,该方法对同类型储层的流体性质判别具有借鉴意义。Low porosity and low permeability reservoirs are developed in the eastern third section of the target layer in the Bohai LD oilfield,with complex pore structures.The fluid pressure difference between the reservoir and the ground is small,and the dissolved gas oil ratio is high,resulting in small differences in the logging response characteristics of oil,gas,and water layers.Comparing and analyzing the logging and logging data of oil,gas,and water layers confirmed by testing,pressure measurement,and sampling,it is believed that the intersection amplitude of volume compression coefficient and Poisson’s ratio,apparent formation water resistance,gas logging anomaly multiple,and pyrolysis gas chromatography are more sensitive to the response of fluid properties.Based on the four types of parameters mentioned above,a fluid discrimination model for oil,gas,and water layers is established using support vector machine algorithm,with 70 samples of oil,gas,and water layers confirmed through testing,pressure measurement,and sampling as data samples,including 51 samples as training samples and 19 samples as testing samples.This method has achieved good results in fluid identification in LD oilfield,with a compliance rate of 89.4%for fluid property identification,laying a foundation for reserve evaluation in the oilfield.This method has reference significance for fluid property identification of similar reservoirs.

关 键 词：低孔隙度低渗透率 复杂流体 测录井 流体识别参数 支持向量机 

分 类 号：P631.84[天文地球—地质矿产勘探]