海洋地质前沿2026，Vol.42Issue(3)：87-98,12.DOI:10.16028/j.1009-2722.2024.263
变质岩矿物组成对裂缝扩展的影响
The influence of metamorphic rock mineral composition on fracture propagation:a case study of buried-hill reservoir of Archean in Jinzhou 25-1 South Oilfield,Bohai Bay Basin
摘要
Abstract
The buried hill has great exploration value and has become a hot spot of exploration in Bohai Bay in recent years.To study the fracture propagation characteristics of metamorphic rocks in buried hill in the Bohai Bay under stress,the Archean metamorphic rocks from the buried hills in the Jinzhou 25-1 South Oilfield were studied.Real-time X-ray CT scanning uniaxial compression tests on three types of rock specimens,i.e.,monzogneiss,plagiogneiss,and migmatitic gneiss were performed to analyze the fracture propagation characterist-ics.Quantitative mineral analyses were conducted on damaged samples to study the influence of mineral composi-tion on fracture propagation.Results indicate that,under the uniaxial compression,vertical high-angle initial cracks at smaller angles relative to the stress direction are more prone to propagation than horizontal ones.The yield deformation stage before peak strength is the crucial phase for fracture propagation during specimen loading.Under the same strain conditions,monzogneiss specimen showed the most developed fractures,followed by pla-giogneiss and migmatitic gneiss specimens.The major fractures propagated mostly along minerals and mineral in-terfaces with low fracture toughness.Additionally,the formation of more weak interfaces of mineral(such as those between potassium feldspar-plagioclase and potassium feldspar-biotite)in monzogneiss favored the fractur-ing,and the distribution of various minerals with similar contents had a positive impact on fracture propagation.After expansion of microfractures,they can be used as high-quality reservoir space and seepage channel.This study provided a guidance for predicting the degree of fracture development in buried hill structures under litholo-gical control,and a certain reference value for formulating development plan of Jinzhou 25-1 South Oilfield.关键词
潜山变质岩/实时X射线CT扫描/裂缝扩展/矿物组成Key words
metamorphic buried hill/real-time X-ray CT scan/fracture propagation/mineral composition分类
海洋科学引用本文复制引用
葛丽珍,杨昆,朱建敏,孟智强,刘超..变质岩矿物组成对裂缝扩展的影响[J].海洋地质前沿,2026,42(3):87-98,12.基金项目
中海油科技攻关项目"渤海典型变质岩潜山油藏不同尺度裂缝精细刻画及表征研究"(CCL2023TJT0NST1100) （CCL2023TJT0NST1100）
