摘要
鄂尔多斯盆地大牛地气田DK13井区孔隙型碳酸盐岩储层非均质性强,采用水力加砂压裂后,产气量差异大。为了明确影响产气量的主控因素,通过构建单层产气贡献率计算模型、建立地质工程参数与产气量热图矩阵图版,对影响产气量的地质工程主控因素进行研究分析,形成双甜点评价及产能预测计算公式。研究结果表明:①马五5层产气贡献率与自然伽马呈负相关,与声波时差、体积密度和含气饱和度呈正相关,马五_(6+7)层产气贡献率与储层厚度、体积密度和中子孔隙度呈正相关;②根据热图矩阵分析,马五_(5-7)层产气量与储层厚度、最高全烃值、孔隙度、含气饱和度、入地液量、酸量、砂量相关性较高;③根据多因素分析,构建了马五_(5-7)层双甜点指数计算模型,采用模型计算的双甜点指数与产气量相关性为0.9375;④根据双甜点指数,建立了产量预测模型,预测产气量与实际产气量误差小于2%。结论认为:所建立的地层工程甜点及产能预测模型与实际符合率高,可有效指导该气田压裂选段及压裂设计优化,具有推广应用价值。
In Daniudi gasfield,Ordos Basin,production differs greatly in porous carbonate reservoirs even after hydraulic sand fracturing due to strong reservoir heterogeneity.Thus,a model was established to compute the production contribution of each layer,and a heat map matrix chart was created on both geology-engineering parameters and production data.More-over,the major geology-engineering factors influencing on the production were analyzed to evolve into a formula for evalu-ating double sweetspots and calculating productivity.Results show that(i)the production contribution in fifth submember of Majiagou 5 Member(Ma 55,hereinafter same)negatively correlates with gamma ray and positively with interval transit time,bulk density and gas saturation.While that of Ma 5^(6+7) is positively correlated with reservoir thickness,bulk density and neutron porosity;(ii)the production in Ma 5^(5-7) is in high correlation with reservoir thickness,maximum total hydrocar-bon,porosity,gas saturation,and injected fracturing-liquid,and acid proppant volume;(iii)the established double-sweet-spot index calculation model for Ma 5^(5-7) is dependent on multiple factors,and the calculated index has the correlation of 0.9375 with the production;and(iv)the created production prediction model is on the basis of the double-sweetspot in-dex,and the error between the predicted and actual production is less than 2%.In conclusion,with high coincidence with reality,both geology-engineering sweetspot and productivity prediction models which provide active guidance for selecting staged fracturing and designing optimal fracturing are worth popularizing.
作者
蒋艳芳
JIANG Yanfang(Petroleum Engineering Technology Research Institute,Sinopec North China Company,Zhengzhou,Henan 450006,China)
出处
《天然气技术与经济》
2025年第1期1-5,19,共6页
Natural Gas Technology and Economy
关键词
碳酸盐岩储层
产量劈分
产量影响因素
双甜点指数
灰色关联法
大牛地气田
Carbonate reservoir
Production split
Production control
Double-sweetspot index
Gray correlation method
Daniudi gasfield
