张萱,林小兵,杨华童,王壮生,范峻铭,柳远松,张振南
ZHANG Xuan,LIN Xiaobing,YANG Huatong,WANG Zhuangsheng,FAN Junming,LIU Yuansong,ZHANG Zhennan

• 1:成都理工大学沉积地质研究院
• 2:油气藏地质及开发工程国家重点实验室
• 3:自然资源部深时地理环境重建与应用重点实验室

摘要(Abstract)：

牙哈地区吉迪克组滩坝砂体埋藏深、高砂地比且单层厚度薄，分布规律复杂，地震测井分辨率难以识别和追踪，在进行砂体精细刻画以及预测评价方面有着较大难度。基于牙哈地区新近系吉迪克组底砂岩段岩心、测井等资料，对滨浅湖滩坝微相及岩性组合进行精细刻画，分析了滩坝迁移规律及控制因素。结果表明：研究区吉迪克组底部砂岩段滨浅湖滩、坝亚相可进一步划分为坝中、坝缘、滩席和滩间微相类型；滩坝的展布、迁移叠置受湖岸线、古地貌、古风浪及沿岸流等因素控制，先随湖水不断加深坝体向岸迁移，直至湖平面稳定时期大量泥质沉积，而后湖平面下降坝体呈向湖中心进积模式；其岩性组合可划分为4类：厚层砂岩叠置组合（A类）；中-厚层砂岩夹薄层泥岩组合（B类）；薄层泥、砂岩互层组合（C类）；厚层泥岩夹薄层砂岩组合（D类）。研究成果为滨浅湖滩坝砂体研究提供了新的参考。
Beach-bar sand bodies of Jidike Formation in Yaha area are characterized by deep burial and high sandstone strata thickness ratio, with small single-layer thickness and complex distribution law. Seismic logging resolution cannot identify and track, causing much difficulty in fine characterization, prediction and evaluation of sand body. Based on core data and logging data of the bottom sandstone interval of Neogene Jidike Formation in Yaha area, the microfacies and lithologic assemblages of beach bars in shore-shallow lake are finely described, and migration laws and controlling factors of beach bars are analyzed. The results show that shore-shallow lake beach and bar subfacies of bottom sandstone interval of Jidike Formation in studied area are furtherly classified into the types of bar center, bar edge, beach sheet and inter-beach microfacies. Distribution, migration and superimposition of beach bars are controlled by lake shoreline. paleogeomorphology, paleo-wind, paleo-waves and longshore currents.Bar body firstly migrates to the shore with continuous deepening of lake water until lake-level stable period with large amount of argillaceous sediments, and then lake level falls with bar body showing progradational mode to lake center. Lithologic assemblages are divided into 4 types: thick sandstone superimposition(Class A), medium-thick sandstone interlayered with thin mudstone(Class B), thin mudstone-sandstone interbeds(Class C), thick mudstone interlayered with thin sandstone(Class D). The research provides new reference for study on beach bar sand bodies of shore-shallow lake.

关键词(KeyWords)： 滩坝砂;岩性组合;迁移规律;沉积微相;吉迪克组;牙哈地区
beach-bar sandstone;lithologic assemblage;migration law;sedimentary microfacies;Jidike Formation;Yaha area

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目“致密砂岩含F成岩流体地球化学演化与硅质碎屑颗粒溶蚀机制”（42172135）

作者(Author): 张萱,林小兵,杨华童,王壮生,范峻铭,柳远松,张振南
ZHANG Xuan,LIN Xiaobing,YANG Huatong,WANG Zhuangsheng,FAN Junming,LIU Yuansong,ZHANG Zhennan

DOI: 10.19597/j.issn.1000-3754.202212031

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