| 北羌塘胜利河地区Qs1井层序地层及沉积微相分析 |
| 投稿时间：2024-07-01 修订日期：2024-12-04 点此下载全文 |
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| 基金项目:中国地质科学院基本科研业务，羌塘盆地重点地区选区评价研究，JKY202301, |
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| 中文摘要:北羌塘坳陷早中侏罗世发育了多套优质海相烃源岩，是一段关键的沉积演化时期。本文对北羌塘坳陷胜利河地区的Qs1井开展了层序地层及体系域划分，并在各层序内建立沉积相序列，进一步利用岩心及岩石薄片开展沉积亚相及微相研究。将Qs1井中下侏罗统雀莫错组（J1-2q）划分为1个三级层序SQq（未见底），将中侏罗统布曲组（J2b）划分为2个三级层序SQb1、SQb2（未见顶）。将SQq与SQb1之间的层序界面命名为SBb1，SQb1与SQb2之间的层序界面命名为SBb2。在SQq中，以最大海泛面（mfsq）为界，识别出海侵体系域（TSTq）和高位体系域（HSTq）。在SQb1中，以最大海泛面（mfsb1）为界，识别出海侵体系域（TSTb1）和高位体系域（HSTb1）。在SQb2中只识别出海侵体系域（TSTb2），高位体系域全部被剥蚀。在Qs1井中下侏罗统识别出了混积潮坪相、无障壁滨岸相、碳酸盐岩台地相3种沉积相，各沉积相进一步细分为6种沉积亚相、32种沉积微相。 |
| 中文关键词:北羌塘坳陷 胜利河地区 Qs1井 层序地层 沉积微相 |
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| Sequence stratigraphy and sedimentary microfacies analysis of well Qs1 in Shengli River area, North Qiangtang |
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| Abstract:In the early and Middle Jurassic, several sets of high-quality Marine source rocks developed in the North Qiangtang Depression. It is a particularly critical period of sedimentary evolution. In this paper, sequence stratigraphy and system tracts of well Qs1 in Shengli River area of North Qiangtang Depression are divided. Sedimentary facies are recognized in each sequence, and sedimentary subfacies and microfacies are further studied using core and rock slices. In well Qs1, the Lower and Middle Jurassic Quemocuo Formation (J1-2q) was divided into one third-order sequence, named SQq (without bottoming), and the Middle Jurassic Buqu Formation (J2b) was divided into two third-order sequences, named SQb1 and SQb2 (without peaking). The sequence interface between SQq and SQb1 is named SBb1, and the sequence interface between SQb1 and SQb2 is named SBb2. The transgressive system tract (TSTq) and the high system tract (HSTq) were identified in SQq, bounded by the maximum flooding surface (mfsq). The transgressive system tract (TSTb1) and the high system tract (HSTb1) were identified in SQb1, bounded by the maximum flooding surface (mfsb1). The transgressive system tract (TSTb2) was identified in SQb2, and the high system tract was all denuded. Three sedimentary facies were identified in the middle and lower Jurassic of well Qs1: the mixed tidal flat facies, the barrier-free shoreline facies, and the carbonate platform facies. These sedimentary facies are further subdivided into 6 subfacies and 32 microfacies. |
| keywords:North Qiangtang Depression Shengli River area well Qs1 sequence stratigraphy sedimentary microfacies |
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