川东北龙会5井下三叠统飞仙关组鲕粒特征及成因  

Characteristics and Genesis of Lower Triassic Feixianguan Formation Ooids in Longhui 5 Well, Northeast Sichuan

作　　者：石桂鹏 张云峰[1] 徐亮[2] 徐婉月 曹俊峰 张奇[2] 赵子瑄 SHI Guipeng;ZHANG Yunfeng;XU Liang;XU Wanyue;CAO Junfeng;ZHANG Qi;ZHAO Zixuan(Institute of Earth Science and Technology, Southwest Petroleum University, Chengdu 610500, China;Research Institute of Exploration and Development, Southwest Oil and Gas Field Company, PetroChina, Chengdu 610051, China;College of Geosciences, China University of Petroleum (Beijing), Beijing 102249, China;The Fourth Drilling Branch of CNPC Bohai Drilling Engineering Company Limited, Renqiu Hebei 062550, China)

机构地区：[1]西南石油大学地球科学与技术学院,成都610500 [2]中国石油西南油气田分公司勘探开发研究院,成都610051 [3]中国石油大学地球科学学院,北京102249 [4]中国石油集团渤海钻探工程有限公司第四钻井工程分公司,河北任丘062550

出　　处：《重庆科技学院学报（自然科学版）》2019年第3期1-7,共7页Journal of Chongqing University of Science and Technology：Natural Sciences Edition

基　　金：国家自然科学基金项目“米仓山地区埃迪卡拉系灯影组核形石微组构及环境意义”(41702122)

摘　　要：以川东北气矿龙会5井飞仙关组鲕粒为研究对象,借助岩心、薄片资料,分析了鲕粒的粒度、类型、垂向分布特征。飞仙关组的鲕粒包括正常鲕、表皮鲕、变形鲕、多晶鲕、复鲕等类型;粒径分布多在1~6mm,垂向上粒度具有先逆后正的特点,常见巨鲕与普通鲕粒混积。鲕粒圈层中发现有微生物的踪迹,同时存在未经微生物改造的光滑圈层。巨鲕的形成过程受物理和化学作用主导,是一种错时相沉积物,可作为早三叠世风暴环境的标志物。微生物的参与只是在后期改造鲕粒形态,不属于巨鲕形成的本质性原因。The paper takes the ooids of Feixianguan Formation, Longjing 5 well as the research object, and mainly study the grain size, type and vertical distribution, based on core and slice data. The types of ooids include normal ooid, superficial ooid, deformed ooid, collapsed ooid, composite ooid, and etc. The particle size distribution range is about 1-6 mm. The grain size of vertical direction has the characteristics of being reversed first and then positive and giant ooids and normal ooids coexit. Traces of microbes are found in the oolitic layer, but there is also a smooth layer without microbial transformation. The formation process of giant oolitic is dominated by physical and chemical actions, which belongs to staggered sediment, and it can be seen as a marker for Early Triassic storm environment. The participation of microorganisms only remodels oolitic grain morphology in the later stage, which does not belong to the essence of giant oolitic formation.

关 键 词：川东北气矿 龙会5井 飞仙关组 鲕粒 巨鲕成因 风暴环境 

分 类 号：P588.2[天文地球—岩石学]