放射虫硅质壳腔体微纳米硅质—有机质聚合体赋存特征、成因及油气地质意义——以四川盆地五峰—龙马溪组为例  

Occurrence characteristics,genesis and petroleum geological significance of micro-nano silica-organic matter aggregate in radiolarian siliceous shell cavity:a case study of Wufeng-Longmaxi Formation in Sichuan Basin,SW China

作　　者：周晓峰[1,2] 郭伟 李熙喆[3] 张晓伟[3] 梁萍萍[3] 于均民[1] ZHOU Xiaofeng;GUO Wei;LI Xizhe;ZHANG Xiaowei;LIANG Pingping;YU Junmin(School of Petroleum Engineering,China University of Petroleum(Beijing),Beijing 102249,China;State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing),Beijing 102249,China;PetroChina Research Institute of Petroleum Exploration and Development Beijing 100083,China)

机构地区：[1]中国石油大学(北京)石油工程学院,北京102249 [2]中国石油大学(北京)油气资源与探测国家重点实验室,北京102249 [3]中国石油勘探开发研究院,北京100083

出　　处：《东北石油大学学报》2021年第6期68-79,I0005,共13页Journal of Northeast Petroleum University

基　　金：国家科技重大专项(2017ZX05035-004)。

摘　　要：四川盆地五峰—龙马溪组放射虫硅质壳腔体发现微纳米硅质—有机质聚合体(MNSA MNOMA)。基于普通薄片、氩离子抛光片和扫描电镜观察,分析MNSA MNOMA赋存特征、成因及油气地质意义。结果表明:放射虫硅质壳富集成纹层,硅质壳腔体发育5种类型交互共生的MNSA MNOMA(Ⅰ~Ⅴ类),形成时间为水柱中沉降—成岩阶段,所需硅质和有机质主要由微生物供给,生物硅溶解提供部分硅源。Ⅰ~Ⅳ类MNSA MNOMA赋存状态指示不同硅质壳腔体内微环境差异,Ⅴ类MNSA MNOMA是Ⅰ~Ⅳ类MNSA MNOMA经历差异压实作用的产物,MNOMA中纳米孔为原地有机质孔。该结果为类似页岩储层及有机孔研究提供指导。Symbiotic micro-nano silica-organic matter aggregate(MNSA MNOMA)was found in the radiolarian siliceous shell cavity from Wufeng Longmaxi Formations in Sichuan Basin.In order to observe occurrences of the MNSA MNOMA and analyze their genesis and petroleum geological significance,thin slices and scanning electron microscope combining with argon ion polishing technology were applied.The results show that radiolarian siliceous shells are rich in laminae,and 5 types of MNSA MNOMA(typeⅠ-Ⅴ)exist in the cavities of the shells.The formation time of the MNSA MNOMA is at the descent-diagenesis stage of the shells in the seawater column,and silicon and organic matter are mainly supplied by the microbial activity with biological silicon dissolution contributing to a part of silicon sources.Due to the difference of the microenvironments in the shell cavities,typeⅠ-Ⅳ MNSA MNOMA were formed.The fifth type of the MNSA MNOMA is the result of the differential compaction from the first four types of the MNSA MNOMA.Nanopores in the MNOMA are in situ organic matter pores.The result provides a guidance for the study of similar shale reservoirs and organic pores.

关 键 词：微纳米硅质—有机质聚合体 微生物活动 沉降—成岩阶段 放射虫硅质壳腔体 五峰—龙马溪组 四川盆地 

分 类 号：TE132.1[石油与天然气工程—油气勘探] P618.13[天文地球—矿床学]