石油与天然气地质2025，Vol.46Issue(3)：944-958,15.DOI:10.11743/ogg20250316
北非克拉通盆地古生界碎屑岩储层特征与成储机制
Characteristics and formation mechanisms of the clastic reservoirs in the Paleozoic cratonic basins of North Africa
摘要
Abstract
The widely distributed Paleozoic clastic rocks are identified as the primary target for hydrocarbon exploration and production in the cratonic basins of North Africa.The diagenetic evolution and late-stage modification vary greatly in different regions across North Africa,resulting in significantly different reservoir quality.Based on the data from 492 hydrocarbon reservoirs across eight tectonic units in North Africa,sourced from IHS Markit,as well as the burial,geothermal,and diagenetic evolution histories of these reservoirs,we investigate the differences in the characteristics of the Paleozoic clastic reservoirs across different epochs and regions in North Africa.Furthermore,the major factors controlling the development of high-quality reservoirs are clarified and the favorable areas for reservoir development are predicted.The results indicate that the Cambrian,Ordovician,and Devonian sandstone reservoirs of the Paleozoic are major pay zones in the cratonic basins of North Africa.These reservoirs consist primarily of fluvial,littoral-nearshore,and neritic clastic rock deposits with extensive distribution and high continuity.Two types of burial history occurred in these reservoirs,leading to varying diagenetic processes of reservoirs across different regions and epochs with differential tectonic evolution.The compaction and secondary overgrowth and cementation of quartz during diagenesis are detrimental to the physical properties of reservoirs,while feldspar dissolution,and modifications by multi-stage tectonic fractures are of constructive effects on their physical properties.The favorable Cambrian-Lower Ordovician reservoirs generally occur in the uplifted areas that have been significantly influenced by the Hercynian movement.The high-quality reservoirs of the Upper Ordovician are principally distributed in the Murzuq,Illizi,and Ahnet basins near the Hoggar Shield.The high-quality reservoirs of the Lower Devonian exhibit more extensive distribution,primarily found in the Illizi,Ahnet,Timimoun,and Reggane basins,as well as the northern uplift and slope areas of the Ghadames Basin.关键词
差异成岩作用/储层致密化/储层形成机制/古生界/克拉通盆地/北非Key words
differential diagenesis/reservoir tightening/reservoir formation mechanism/Paleozoic/cratonic basin/north Africa分类
能源科技引用本文复制引用
吕雪雁,曹喆,杨光庆,张玉银,刘静静,李晋,张忠民..北非克拉通盆地古生界碎屑岩储层特征与成储机制[J].石油与天然气地质,2025,46(3):944-958,15.基金项目
国家自然科学基金面上项目(42272191) （42272191）
中国石化科技攻关项目(P19021-4,P22086). （P19021-4,P22086）
