中国石油大学学报（自然科学版）2026，Vol.50Issue(3)：69-83,15.DOI:10.3969/j.issn.1673-5005.2026.03.006
北部湾盆地低勘探程度凹陷烃源岩发育规律评价与潜力比选
Evaluation of hydrocarbon source rock development pattern and potential comparison of low exploration degree sags in Beibu Gulf Basin
摘要
Abstract
To address the challenges of limited drilling data and the difficulty of evaluating exploration potential in low-explo-ration sags of the Beibu Gulf Basin,this study systematically assesses and compares the potential of such sags through de-tailed analysis and quantitative/semi-quantitative characterization of structural and depositional features during the hydrocar-bon source rock formation period.A systematic evaluation methodology,termed the"tectonic three-rate and sedimentary three-unit"approach,was established using hydrocarbon-rich sags as analogs to assess the distribution patterns and explora-tion potential of source rocks in low-exploration sags within the Beibu Gulf Basin.The results indicate that during the deposi-tion of the source rocks of the second member of the Liushagang Formation,the Beibu Gulf Basin was primarilly controlled by NE-trending faults,resulting in extensional tectonic styles and the development of single-fault half graben or double-fault gra-ben sag structures.The rate of fault activity,horizontal extension rate,and basement subsidence rate jointly controlled the structural framework and sedimentary infill of the sags.Significant differences are observed among the sags in terms of parent rock type and uplift rate,sediment dispersal systems and the locations of"grit chambers"during sediment transport,the scale of semi-deep to deep lacustrine environments,paleowater depth,paleo-oxidation conditions,and source-to-sink ratios during source rock deposition.Based on the comprehensive evaluation,two highly prospective subsags,the eastern subsag of the Haizhong sag and the eastern subsag of the Maichen sag,are identified as favorable exploration targets.关键词
烃源岩/构造特征/沉积作用/潜力比选/北部湾盆地Key words
source rock/structural feature/sedimentary effect/exploration potential comparison/Beibu Gulf Basin分类
天文与地球科学引用本文复制引用
李辉,李伟,付大巍,贾海波,周刚,曹明月,雷新,王嘉骏,郭普阳..北部湾盆地低勘探程度凹陷烃源岩发育规律评价与潜力比选[J].中国石油大学学报（自然科学版）,2026,50(3):69-83,15.基金项目
"十三五"国家科技重大专项(2016ZX05024-002) （2016ZX05024-002）
