沉积与特提斯地质2025，Vol.45Issue(1)：1-13,13.DOI:10.19826/j.cnki.1009-3850.2024.04003
羌塘盆地西北部中侏罗统布曲组地层沉积特征
Lithofacies paleogeographic characteristics of the Middle Jurassic Buqu Formation in the northwest Qiangtang Basin
摘要
Abstract
The Buqu Formation of the Middle Jurassic is an important horizon for oil and gas exploration in the Qiangtang Basin.During the field geological survey,a set of high-quality dolomite reservoirs was discovered in the northwest Qiangtang Basin.Due to the lack of exploration work in the early stages,the analysis of sedimentary facies characteristics remains an important factor for achieving breakthroughs in oil and gas exploration in the Middle Jurassic Buqu Formation of the northwest Qiangtang Basin.Based on field section lithology observations and rock thin section identification,seven typical types of lithofacies assemblage developed in the area are summarized,and the sedimentary facies types and distribution characteristics in the Buqu Formation are analyzed.The results show that:(1)From south to north,the Middle Jurassic Buqu Formation develops four types of sedimentary subfacies,namely the open platform subfacies,the platform margin subfacies,the slope subfacies,and the shallow water shelf subfacies,which can be further subdivided into seven types of suborder facies.(2)Based on the planar distribution of sedimentary facies of the Buqu Formation in the Middle Jurassic,the sedimentary model is defined as a typical rimmed carbonate platform with a sedimentary model from"open platform"to"platform margin","slope",and"shelf".(3)Combined with the vertical superposition relationship between the Triassic and Jurassic strata in the area,it can be further determined that the combination of source-reservoir-seal form with the dark mudstone of the Adula Formation(T3a),the Buqu Formation(J2b),and the Suowa Formation(J3s)as source rocks,the dolomite and bioreef limestone of the Buqu Formation as reservoirs,along with the micritic limestone of the upper Buqu Formation and the mudstone and gypsum of the Xiali Formation as seals.It provides theoretical support for breakthroughs in oil and gas exploration in the Middle Jurassic Buqu Formation of the northwest Qiangtang Basin.关键词
羌塘盆地西北部/布曲组/白云岩/岩相组合/沉积模式Key words
northwest Qiangtang Basin/Buqu Formation/dolomite/lithofacies assemblage/sedimentary model分类
地质学引用本文复制引用
刘中戎,陈孔全,范志伟,韩京,吴浩,何志勇,张斗中,庞一桢,马帅..羌塘盆地西北部中侏罗统布曲组地层沉积特征[J].沉积与特提斯地质,2025,45(1):1-13,13.基金项目
中国石油化工股份有限公司科技部项目"羌塘盆地油气资源潜力分析与勘探关键技术"课题2"羌塘盆地油气成藏条件研究与目标评价"(P22197) （P22197）
中国石油化工股份有限公司勘探分公司项目"羌塘盆地中生界沉积储层特征与区带优选" （）
