基于Fisher判别法的致密砂岩测井成岩相识别——以鄂尔多斯盆地YQ-XC地区长8储层为例  

Log diagenetic facies identification of tight sandstone based on Fisher discriminant method——Taking Chang 8 reservoir in YQ-XC area of Ordos Basin as an example

作　　者：贺彤彤 周淋 王小宁 杨青艳 段治川 王涛[1] 谢建军 朱玉双[3] HE Tongtong;ZHOU Lin;WANG Xiaoning;YANG Qingyan;DUAN Zhichuan;WANG Tao;XIE Jianjun;ZHU Yushuang(Oil Production Plant 9 of PetroChina Changqing Oilfield Company,Yinchuan Ningxia750006,China;Oil&Gas Technology Research Institute,PetroChina Changqing OilfieldCompany,Xi'an Shaanxi 710016,China;State Key Laboratory of ContinentalDynamics,Northwestern University,Xi'an Shaanxi 710069,China)

机构地区：[1]中国石油长庆油田分公司第九采油厂,宁夏银川750006 [2]中国石油长庆油田分公司油气工艺研究院,陕西西安710016 [3]西北大学大陆动力学国家重点实验室,陕西西安710069

出　　处：《石油化工应用》2024年第10期55-62,共8页Petrochemical Industry Application

摘　　要：成岩相与储层质量密切相关,通过研究储层的成岩相,可为储层“甜点”的预测提供指导,为油气的勘探开发提供依据。本文应用物性分析测试、铸体薄片、扫描电镜、阴极发光等实验,同时根据成岩作用类型、成岩矿物组合等将鄂尔多斯盆地YQ-XC地区长8储层划分为五种成岩相类型:致密压实相、不稳定组分溶蚀相、残余粒间孔相、碳酸盐胶结相和黏土矿物胶结相。通过交会图处理常规测井资料,发现不同的成岩相具有不同的测井响应,但是各成岩相之间分区的重叠部分较多,因此,并不能通过交会图识别不同成岩相。利用Fisher判别法计算各样品点平面投影,建立不同成岩相的判别函数,对成岩相的正确识别率可达93.9%。通过与铸体薄片鉴定结果对比,验证了该方法的准确性,同时结合岩屑录井资料分析,认为成岩相对于油气富集具有一定的控制作用,残余粒间孔相储层为油气富集区域,不稳定组分溶蚀相次之,可将残余粒间孔相和不稳定组分溶蚀相作为研究区下一步油气勘探开发的重点区带。Diagenetic facies is closely related to reservoir quality.The study of diagenetic facies can provide guidance for the prediction of reservoir"dessert"and provide basis for oil and gas exploration and development.In this paper,the Chang 8 reservoir in YQ-XC area of Ordos Basin is divided into five types of diagenetic facies according to the type of diagenesis and the combination of diagenetic minerals by using physical property analysis test,casting thin section,scanning electron microscope,cathodoluminescence and other experiments,compact compaction facies,unstable component dissolution facies,residual intergranular pore facies,carbonate cementation facies and clay mineral cementation facies.Through cross plot processing of conventional logging data,it is found that different diagenetic facies have different logging responses,but there are many overlaps between different diagenetic facies,so it is not possible to identify different diagenetic facies through cross plot.The Fisher discriminant method is used to calculate the plane projection of each sample point and establish the discriminant function of different diagenetic facies.The correct recognition rate of diagenetic facies can reach 93.9%.The accuracy of this method is verified by comparing with the identification results of cast thin sections.At the same time,combined with the analysis of cuttings logging data,it is considered that diagenesis has a certain control effect on oil and gas enrichment.The reservoir of residual intergranular pore facies is an oil and gas enrichment area,followed by the dissolution facies of unstable components.The residual intergranular pore facies and the dissolution facies of unstable components can be taken as the key areas for the next oil and gas exploration and development in the study area.

关 键 词：致密砂岩 长8储层 Fisher判别法 成岩相 

分 类 号：TE122.221[石油与天然气工程—油气勘探]