中国石油大学学报（自然科学版）2025，Vol.49Issue(6)：30-41,12.DOI:10.3969/j.issn.1673-5005.2025.06.003
渤南低凸起变质岩潜山风化壳储层发育特征及控制因素
Development characteristics and controlling factors of weathering crust reservoirs in metamorphic rock buried hills of Bonan Low Uplift
摘要
Abstract
The BZ 26-6 oil and gas field,a newly discovered billion-ton-scale buried-hill bedrock reservoir in Bohai Sea,is characterized by a large-scale reservoir system dominated by a weathering-crust hydrocarbon storage zone.By integrating drilling,seismic,logging,and laboratory analysis data,this study elucidates the development characteristics of the buried-hill bedrock reservoir and identifies the main controlling factors governing weathering-crust formation.The results indicate that the metamorphic buried-hill reservoir is primarily composed of metamorphic granites,with dissolution pores and structur-al fractures serving as the main reservoir spaces.Vertically,the reservoir can be divided into three zones:a weathered sand-stone zone,a weathered fracture zone,and a bedrock fracture zone.The formation and distribution of the buried-hill weathe-ring crust reservoir are jointly controlled by lithology,tectonics,weathering-leaching processes,and paleogeomorphology.A-bout 90%of the reservoir consists of felsic-rich metamorphic granites,providing a favorable material basis for weathering-crust development.Multiphase tectonic movements generated extensive fractures within the buried hill,which not only con-tributed directly to reservoir space but also enhanced deep-seated dissolution through fluid migration.Weathering-leaching played a critical role,with weathering intensity decreasing downward and optimal reservoir quality occurring within 300 m of the buried-hill top surface.Paleogeomorphology further influenced weathering crust thickness and distribution.High-elevation areas experienced strong weathering but poor preservation,with thin weathered sandstone zones and moderately thick weath-ered fracture zones.Steep slopes developed moderate fracture zones,while gentle slopes and low-lying areas provided favora-ble conditions for the preservation of thick weathered sandstone and fracture zones.关键词
变质岩潜山/储层特征/风化壳/主控因素/发育模式/渤中26-6/渤南低凸起/渤海海域Key words
metamorphic rock buried hill/reservoir characteristics/weathering crust/main controlling factors/developmen-tal patterns/BZ 26-6/Bonan low uplift/Bohai sea area分类
能源科技引用本文复制引用
赵昭,胡志伟,叶涛,李果营,岳军培,谢祥..渤南低凸起变质岩潜山风化壳储层发育特征及控制因素[J].中国石油大学学报（自然科学版）,2025,49(6):30-41,12.基金项目
国家科技重大专项(2016ZX05024-003) （2016ZX05024-003）
中国海洋石油有限公司"十四五"重大科技项目(KJGG2022-0302) （KJGG2022-0302）
