| 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 |
| 关键词:North Qiangtang Depression Shengli River area well Qs1 sequence stratigraphy sedimentary microfacies |
| 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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| 摘要: |
| Sequence stratigraphy and sedimentary microfacies analysis of well Qs1 in Shengli River area, North Qiangtang |
| 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. |
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