碳酸盐岩层系中非碳酸盐矿物对层序界面及成岩流体环境的指示——以塔河深层TS2井为例  

Indications of Non-Carbonate Minerals in the Carbonate Strata to the Sequence Boundary and Diagenetic Fluid Environment: A Case Study of the TS2 Well in the Tarim Basin

作　　者：彭守涛[1] 何治亮[1,2] 钱一雄[1,3] 马红强[3] 刘永立[4] 吴仕强[1,2] 焦存礼 PENG Shou-tao;HE Zhi-liang;QIAN Yi-xiong;MA Hong-qiang;LIU Yong-li;WU Shi-qiang;JIAO Cun-li(Exploration&Production Research Imlitule,SINOPEC,Beijing 100083,China;Ministry of and Technology Development,SINOPEC,Beijing 100728,China;Wuxi Institutet Exploration&Production Research Institute,SINOPEC,Wuxi Jiangsu 214151,China;Northwest Oilfield Branch,SINOPEC,Urumqi 841000,China)

机构地区：[1]中国石化石油勘探开发研究院,北京100083 [2]中国石油化工股份有限公司科技开发部,北京100728 [3]中国石化石油勘探开发研究院无锡石油地质研究所,江苏无锡214151 [4]中国石化西北油田分公司,乌鲁木齐841000

出　　处：《矿物岩石地球化学通报》2019年第5期897-901,I0002,共6页Bulletin of Mineralogy, Petrology and Geochemistry

基　　金：国家自然科学基金资助项目(U1663209);中国石化科技开发部项目(G5800-17-ZS-KJB032,P16112)

摘　　要：碳酸盐岩层系中以碳酸盐岩矿物为主,其中所含有的少量非碳酸盐岩矿物与沉积过程、成岩过程或陆源碎屑物有关,非碳酸盐岩矿物类型与含量变化为判别沉积与成岩流体环境等提供了相对客观的依据。本文以塔里木盆地塔河地区深层TS2井上寒武统-中下奥陶统溶洞段及关键界面处的27件岩屑样品的系统矿物分析为例,探讨非碳酸盐矿物对层序界面成岩流体环境的指示意义。结果表明,该井下奥陶统鹰山组下段内部界面、上寒武统丘里塔格组顶面处的赤铁矿含量明显较高,表明这两个界面为沉积间断或不整合面;上寒武统丘里塔格组溶洞段砂泥岩充填物与上寒武统顶不整合面上下的矿物组合较一致,表明塔河深层上寒武统白云岩可能经历了大气淡水的成岩流体改造。The carbonate stratum is dominantly composed of carbonate minerals,with a small amount of non-carbonate minerals which are related to the sedimentation and diagenetic processes,or related to terrigenous clastic materials.The variation of type and content of those non-carbonate minerals can provide relatively objective evidences for the identification of sedimentary process and diagenetic fluid environment.In order to explore the indicative significance of non-carbonate minerals to the sequence boundary and diagenetic fluid environment,a case study of systematic mineral analysis of 27 debris samples from the caves and important boundaries in the Upper Cambrian-Lower Ordovician carbonate strata in cores of the TS2 well in the Tarim basin has been carried out in this paper.The results show that the obviously high hematite contents of stratigraphic interfaces in the low part of the Lower Ordovician Yingshan Formation and the top part of the Upper Cambrian Qiulitage Formation reveal that these two interfaces are of sedimentary discontinuity or unconformity.In addition,the relative consistence of mineral assamblages of the sandy mudstone filling in caves of the Upper Cambrian Qiulitage Formation and those of the unconformity interface of the Upper Cambrian suggests that dolomite of the Upper Cambrian strats in depth in the Tahe Oilfield could have been reworked by the diagenetic fluid of atmospheric freshwater.

关 键 词：非碳酸盐岩矿物 层序界面 成岩流体环境 塔里木盆地 

分 类 号：P578.44[天文地球—矿物学]