大牛地气田DK13井区碳酸盐岩储层地质工程甜点评价  

Evaluating geology-engineering sweetspots in carbonate reservoirs,DK13 well area,Daniudi gasfield

作　　者：蒋艳芳[1] JIANG Yanfang(Petroleum Engineering Technology Research Institute,Sinopec North China Company,Zhengzhou,Henan 450006,China)

机构地区：[1]中国石化华北油气分公司石油工程技术研究院,河南郑州450006

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

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.

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 

分 类 号：TE321[石油与天然气工程—油气田开发工程]