塔里木盆地塔中—顺托果勒地区奥陶系鹰山组碳酸盐岩颗粒滩沉积特征  

Sedimentary characteristics of Ordovician carbonate intraclastic shoals of the Yingshan Formation,Tazhong-Shuntuoguole area,Tarim Basin

作　　者：鄢伟 樊太亮[5] 张光学[3] 高志前[5] 李一凡[5] 张国庆 李福元 孙鸣[3] 吕瑶瑶[1,4] YAN Wei;FAN Tailiang;ZHANG Guangxue;GAO Zhiqian;LI Yifan;ZHANG Guoqing;LI Fuyuan;SUN Ming;L Yaoyao(Sanya Institute of South China Sea Geology,Guangzhou Marine Geological Survey,Sanya 572025,China;Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou),Guangzhou 510075,China;MLR Key Laboratory of Marine Mineral Resources,Guangzhou Marine Geological Survey,Guangzhou 510075,China;Academy of South China Sea Geological Science,China Geological Survey,Sanya 572025,China;School of Energy Resources,China University of Geosciences(Beijing),Beijing 100083,China)

机构地区：[1]广州海洋地质调查局三亚南海地质研究所,海南三亚572025 [2]南方海洋科学与工程广东省实验室(广州),广东广州510075 [3]广州海洋地质调查局自然资源部海底矿产重点实验室,广东广州510075 [4]中国地质调查局南海地质科学院,海南三亚572025 [5]中国地质大学(北京)能源学院,北京100083

出　　处：《地学前缘》2023年第4期76-87,共12页Earth Science Frontiers

基　　金：国家自然科学基金企业联合基金项目(U19B6003-01-02);南方海洋科学与工程广东省实验室(广州)人才团队引进重大专项(GML2019ZD0208);中国地质调查局项目(DD20191009,DD20221860);广州市科技计划资助项目(202201011397);海南省自然科学基金面上项目(423MS132)。

摘　　要：塔中—顺托果勒地区油气勘探不断取得重大突破已表明该区域蕴藏着丰富的油气资源,而颗粒滩沉积刻画对于沉积环境分析和储层预测具有理论和实践意义。本文通过大量的岩心薄片分析,发现该地区颗粒滩类型主要为内碎屑滩,生物礁体不发育,岩性主要以亮晶碎屑灰岩为主,部分发生白云岩化作用,并且随着深度增加其作用增强。内碎屑滩通常含有一些鲕粒、藻粒和少量生物碎屑,其中鲕粒较小,见低能环境放射鲕。连井对比分析显示:鹰山组可以划分为两个三级层序,并且能在整个塔中地区进行对比,上升半旋回期间颗粒滩沉积以薄层退积为主,下降半旋回期间则以厚层加积为主,而最大海泛面时期颗粒滩发育规模较小。鹰山组沉积时期,颗粒滩在开阔台地和局限台地广泛发育,但两者沉积特征不同,开阔台地颗粒滩沉积厚度较大,呈团块状沿开阔台地外围分布,而局限台地内颗粒滩一般厚度较小,呈小团块或条带状分布。The Tazhong-Shuntuoguole area has been shown to have rich hydrocarbon resources as major breakthroughs in hydrocarbon exploration continue to be made in this area.To understand the regional sedimentary environment and for reservoir prediction purposes it is important,both theoretically and practically,to clarify the sedimentary characteristics of shoals.Through extensive thin section analysis we find the carbonate shoals are mainly intraclastic shoals with underdeveloped biotic reefs,and composed largely of sparry calcite cement that are partly dolomitic.The intraclastic shoals contain some ooid and algae grains,with a little bioclastics often found in micrite.Ooid gains are usually small,with radial texture,and formed in a low-energy environment;while algae grains are usually mixed with intraclast and some bioclastics indicating they are formed in a mid-high-energy environment.The Yingshan Formation can be subdivided into two third-order sequences according to well log analysis.The stacking pattern of carbonate shoals typically shows thin-layered retrogradation within the ascending semi-cycle and thick-layered aggradation within the descending semi-cycle,whilst small-scale shoals develop during the maximum flooding period.Beach-interacting sea facies often develop near the maximum flooding surface.In the Yingshan Formation,open-platform and restricted-platform intraclastic shoals are recognized.The open-platform shoals are thick and distributed as clumps along the platform margin in a thick-layered aggradational stacking pattern,whilst the restricted-platform margin shoals are thin and distributed in small clumps or strips in a similar stacking pattern.

关 键 词：塔里木盆地 鹰山组 内碎屑滩 沉积特征 沉积模式 

分 类 号：P736[天文地球—海洋地质] P534.42[天文地球—海洋科学] P618.13P588.245P736.2