天然气勘探与开发2026，Vol.49Issue(5)：111-121,11.DOI:10.12055/gaskk.issn.1673-3177.20250043
微幅度构造页岩储层压裂效果评价与差异化压裂方案优化
Fracturing effect evaluation and differentiated stimulation scheme optimization for shale reservoirs in micro-amplitude structures
摘要
Abstract
To address the challenges such as high difficulty in stimulation and elevated engineering risks in fracturing for deep shale gas reservoirs in the Luzhou block,southern Sichuan Basin,this study finely characterized micro-amplitude structures using high-precision 3D seismic data.Based on rock mechanics testing,microseismic monitoring,and dynamic production data,the controlling mechanisms of micro-amplitude structures on the stress field and fracture propagation in shale reservoirs were systematically revealed.Differentiated fracturing technology system was formulated accordingly.The following results are obtained.(ⅰ)There develops three types of micro-amplitude structures with amplitudes less than 15 m in the block,i.e.,micro-anticlines,micro-synclines,and micro-faults,collectively forming a"fault-fold-flexure"morphology.The axial parts of micro-anticlines and the hanging walls of micro-faults,characterized by densely-developed natural fractures,a 5%-10%reduction in rock density,and lower Young's modulus and Poisson's ratio(28-35 GPa and 0.21-0.25,respectively),are identified as favorable zones for fracturing stimulation.(ⅱ)Tensile stress is concentrated at the top of micro-anticlines.The fracture pressure is 10-15 MPa lower compared to adjacent areas,allowing fractures to extend over 750 m,and easily causing inter-well interference.Fractures are well-developed in the micro-fault hanging walls,facilitating fracturing fluid leak-off.Stress at fault endpoints increases abruptly by 30%-50%,readily triggering cross-layer channeling.The core of micro-synclines exhibits high fracture pressure and restricted fracture propagation,with microseismic density 40%-55%lower than that of micro-anticlines.It is necessary to increase the fracturing pressure for stimulation.(ⅲ)Based on the classification of micro-amplitude structural units,3D in-situ stress modeling,and hydraulic fracturing simulation,differentiated stimulation schemes,including staged-,cluster-,and process-specific fracturing,are implemented.Field applications demonstrate that the average estimated ultimate recovery(EUR)of individual wells increases by 15%,reaching 1.16×108 m3,while the inter-well interference rate decreases by 31%.In conclusion,the proposed differentiated fracturing technology incorporating micro-amplitude structure characterization,stress modeling,fracturing parameter optimization,and dynamic regulation provides significant support for efficient development of deep shale gas in complex-structure areas.关键词
泸州区块/深层页岩气/微幅度构造/井间干扰/应力场建模/水力压裂数值计算/差异化压裂/压后评估Key words
Luzhou block/Deep shale gas/Micro-amplitude structure/Inter-well interference/Stress field modeling/Numerical calculation for hydraulic fracturing/Differentiated fracturing/Post-frac evaluation分类
能源科技引用本文复制引用
张小涛,余林瑶,李亚丁,张柟乔,王佳鑫,佟恺林..微幅度构造页岩储层压裂效果评价与差异化压裂方案优化[J].天然气勘探与开发,2026,49(5):111-121,11.基金项目
中国石油西南油气田公司科技项目"资中—犍为地区筇竹寺组页岩气储层及含气性主控因素研究"(编号:2025D00408). （编号:2025D00408）
