中国石油大学学报（自然科学版）2025，Vol.49Issue(2)：56-67,12.DOI:10.3969/j.issn.1673-5005.2025.02.005
海拉尔盆地乌北次凹小型断陷湖盆断陷期重力流沉积演化特征
Sedimentary characteristics of gravity flow deposits during the fault depression period in small faulted basins of Wubei sub-sag in Hailar Basin
摘要
Abstract
Small faulted lake basins offer favorable conditions for hydrocarbon reservoir formation,including a short source-reservoir distance and well-developed dominant sand bodies.The Wubei sub-sag is a typical example of such a basin,where reservoir-forming sand bodies primarily consist of gravity flow deposits.Based on a comprehensive analysis of core samples,seismic data,and logging characteristics,various sedimentary types including fan delta,braided river delta,and sub-lacustrine fan have been identified.Under the framework of tectonic sedimentology,we reconstruct the tectono-sedimentary e-volution of gravity flow deposits during the fault depression period in the Wubei sub-sag.The study reveals that,driven by strong tectonic activity during the fault depression period,the Wubei Sub-sag continued to expand.Initially,sedimentation was characterized by east-west source interactions and basin-wide sand infill,but it gradually evolved into a pattern where ter-rigenous fan bodies were confined to the basin margins.Gravity flow deposition,which was initially limited to the central part of the lake basin during the Tongbomiao period,expanded significantly during the Nantun Formation.Sublacustrine fans from different periods are classified into two types:sliding gravity flow and density flow.The most favorable reservoir targets are the turbidite fan bodies of the Nantun Formation and the turbidite sand bodies at the front end of the Tongbomiao Formation's sublacustrine fans.关键词
断陷湖盆/海拉尔盆地/乌北次凹/沉积充填/滑塌型深水重力流/洪水型深水重力流Key words
faulted basin/Hailaer Basin/Wubei sub-sag/sedimentary filling/slumping deep-water gravity flow/flood-type deep-water gravity flow分类
能源科技引用本文复制引用
南金浩,沙宗伦,李跃,孔凡顺,刘少然,侯思宇,于东旭..海拉尔盆地乌北次凹小型断陷湖盆断陷期重力流沉积演化特征[J].中国石油大学学报（自然科学版）,2025,49(2):56-67,12.基金项目
国家科技重大专项(2017ZX05001-002) （2017ZX05001-002）
