石油实验地质2024，Vol.46Issue(4)：735-747,13.DOI:10.11781/sysydz202404735
深层页岩气水平井天然裂缝发育特征及其对精细开发的启示
Development characteristics of natural fractures in horizontal wells for deep shale gas and their implications for enhanced development:
摘要
Abstract
The analysis of natural fracture development characteristics is crucial for evaluating deep shale gas explora-tion and development.It provides valuable insights for assessing reservoir quality comprehensively and designing fracturing strategies differentially.This study focused on the deep shale of the Wufeng-Longmaxi formations in Luzhou area of southern Sichuan Basin(hereinafter referred to as southern Sichuan).Using core analysis,horizontal well imaging logging and seismic data,this study systematically investigated aspects such as descriptions of core natural fractures,development characteristics of horizontal well imaging logging,and the correlation between natural fractures in horizontal wells and seismically predicted fracture zones.The results show that horizontal well imaging logging can accurately identify three types of natural fractures:high-conductivity fractures,high-resistance fractures,and micro-faults.The fracture orientations identified by horizontal wells align with the direction of the current maximum horizontal principal stress,with fracture dip distribution patterns similar to those observed in vertical evaluation wells in the same structural positions.Seismically predicted fracture zones control the develop-ment of core-scale natural fractures identified through imaging logging.The influence distances of medium-intensity curvature body fracture zones,low-intensity curvature body fracture zones,and ant-track fracture zones on core-scale fractures are 110,80,and 30-50 m,respectively.The Luzhou area's core-scale natural fractures exhibit"double-high"characteristics(high dip angle and high degree of calcite filling).The revealed correlations between the deve-lopment characteristics of core-scale natural fractures in horizontal wells,vertical well sections and seismic frac-ture zones serve as valuable references for the fine characterization of natural fractures,reservoir classification evaluation and differential fracturing technology testing of marine shale in southern Sichuan.关键词
水平井/天然裂缝/深层页岩气/五峰组/龙马溪组/泸州区块/四川盆地Key words
horizontal well/natural fracture/deep shale gas/Wufeng Formation/Longmaxi Formation/Luzhou area/Sichuan Basin分类
能源科技引用本文复制引用
杨学锋,夏自强,赵圣贤,何沅翰,高瑞琪,曹埒焰..深层页岩气水平井天然裂缝发育特征及其对精细开发的启示[J].石油实验地质,2024,46(4):735-747,13.基金项目
中国石油天然气集团有限公司科技项目"页岩气规模增储上产与勘探开发技术研究"(2023ZZ21)和中国石油西南油气田分公司科研项目"川南页岩气立体开发模式与技术政策研究"(20220304-06)联合资助. （2023ZZ21）
