石油勘探与开发2026，Vol.53Issue(1)：164-176,13.DOI:10.11698/PED.20250422
毛细管-岩心-储层多尺度体积压裂簇间距确定方法
A multi-scale capillary-core-reservoir approach to determining cluster spacing for volume fracturing:A case study of Chang 7 shale oil of Triassic Yanchang Formation,Ordos Basin,China
摘要
Abstract
This paper proposes an approach to determing the optimal cluster spacing for volume fracturing in shale oil reservoirs based on three scales,i.e.microscopic capillary displacement,large-scale core imbibition,and macroscopic reservoir nuclear magnetic resonance(NMR)logging.Through flow experiments using capillary with different diameters and lengths,and large-scale core counter-current and dynamic imbibition tests,and combing with the NMR logging data of single wells,a graded optimization criterion for cluster spacing is established.The proposed approach was tested in the shale oil reservoir in the seventh member of the Triassic Yanchang Formation(Change 7 Member),the Ordos Basin.The following findings are obtained.First,in the Chang 7 reservoir,oil in pores smaller than 8 μm requires a threshold pressure,and for 2-8 μm pores,the movable drainage distance under a pressure difference of 27 MPa ranges from 0.7 m to 4.6 m.Second,the large-scale core imbibition tests show a counter-current imbibition distance of only 10 cm,but a dynamic imbibition distance up to 30 cm.Third,in-situ NMR logging results verified that the post-fracturing matrix drainage radius around fractures is 0-4 m,which is consistent with those of capillary flow experiments and large-scale core imbibition tests.The main pore-size range(2-8 μm)of the Chang 7 reservoir corresponds to a permeability interval of(0.1-0.4)× 10-3 μm2.Accordingly,a graded optimization criterion for cluster spacing is proposed as follows:for reservoirs with permeability less than 0.20× 10-3 μm2,the cluster spacing should be reduced to smaller than 4.2 m;for reservoirs with permeability of(0.2-0.4)× 10-3 μm2,the cluster spacing should be designed as 4.2-9.2 m.Field application on a pilot platform,where the cluster spacing was reduced to 4.0-6.0 m,yielded an increased initial oil production by approximately 36.6％over a 100-m horizontal reservoir section as compared with untested similar platforms.关键词
体积压裂/簇间距优化/动用范围/多尺度评价/鄂尔多斯盆地/长7段/页岩油Key words
volume fracturing/cluster spacing optimization/drainage area/multi-scale evaluation/Ordos Basin/Chang 7 Member/shale oil分类
能源科技引用本文复制引用
樊建明,刘煌,涂汉敏,郭平,王烁石,胡义升,常睿,何右安,汪周华,张鑫桐,王博,成良丙,徐凯,吴阿蒙..毛细管-岩心-储层多尺度体积压裂簇间距确定方法[J].石油勘探与开发,2026,53(1):164-176,13.基金项目
国家油气重大专项"鄂尔多斯盆地三叠系陆相页岩油勘探开发技术与集成示范"(2025ZD1404800) （2025ZD1404800）
中国石油天然气股份有限公司攻关性应用性重大科技专项"陆相页岩油开发优化技术研究与试验"(2023ZZ15YJ03) （2023ZZ15YJ03）
中国石油长庆油田公司重大专项"鄂尔多斯盆地页岩油渗流机理及有效开发关键技术研究"(2023DZZ04) （2023DZZ04）
