地质通报2026，Vol.45Issue(5)：900-913,14.DOI:10.12097/gbc.2025.06.014
川东北复杂构造背景下致密砂岩裂缝发育模式与控产作用
Fractures development pattern and the differential productivity-controlling of the fractures in tight sandstone under complex structural background,northeastern Sichuan Basin
摘要
Abstract
[Objective]This study aims to clarify the fracture development pattern and differential productivity-controlling mechanisms of the fractures in Xujiahe Formation tight sandstone under the complex structural background in the northeastern Sichuan Basin.The goal is to enhance the efficiency of natural gas exploration and development and improve single-well productivity in the region.[Methods]Based on detailed interpretation of 2D seismic and 3D seismic data of Sinopec Exploration areas,the structural characteristics and evolution of the Xujiahe Formation was investigated.The characteristics and spatial variation of fractures are identified through field outcrop observations,core description,borehole imaging interpretation,and production analysis.And the main controlling factors of fracture development and their impact on reservoir productivity are further analyzed.[Results]The findings indicate that:① The Xujiahe Formation in the northeastern Sichuan Basin experienced three stages of tectonic deformation during the early-middle Yanshanian,late Yanshanian,and Himalayan period.Based on deformation styles,the study area is divided into five tectonic zones.② NE-trending Weak Deformation Zone and Steep Structural Zone are dominated by low-angle and bedding-parallel fractures with small apertures,whereas high-and medium-angle fractures with wider apertures are more developed in other zones.Tensile fractures are well developed in Tongnanba Anticline and NE-trending Weak Deformation Zone,although many are significantly filled.Shear fractures dominate in other zones,and most are unfilled or only partially filled.③ Fracture development is jointly controlled by three-stage tectonic superposition,structural styles,and lithological assemblages.From west to east,fractures increase progressively.NW-trending fault-related fractures have a significant positive impact on well productivity,and fracture development shows a positive correlation with production.[Conclusions]Late-stage NW-trending faults and their associated fractures play a key role in controlling productivity of tight sandstone gas reservoirs and should be considered favorable targets for future exploration and development.关键词
构造特征/裂缝发育机制/须家河组/致密砂岩/川东北Key words
tectonic evolution/main controlling factors of fracture development/Xujiahe Formation/tight sandstone/Northeastern Sichuan Basin分类
天文与地球科学引用本文复制引用
黄彦庆,任启强,刘君龙,黄涵宇,卢晓林,范凌霄,金武军,乔大伟..川东北复杂构造背景下致密砂岩裂缝发育模式与控产作用[J].地质通报,2026,45(5):900-913,14.基金项目
中国石油化工股份有限公司科技开发部项目《川东北须家河组勘探潜力及目标评价》(编号:P23130) Supported by the project of Science and Technology Development Department of China Petroleum&Chemical Corporation(No.P23130) （编号:P23130）
