基于岩性扫描测井的混积岩岩性识别——以玛湖凹陷风城组为例  

Lithology Identification for Diamictite Based on Lithology Scan Logging:A Case Study on Fengcheng Formation,Mahu Sag

作　　者：毛锐[1] 申子明 张浩 陈山河 樊海涛[1] MAO Rui;SHEN Ziming;ZHANG Hao;CHEN Shanhe;FAN Haitao(PetroChina Xinjiang Oilfield Company,Research Institute of Exploration and Development,Karamay,Xinjiang 834000,China;PetroChina Xinjiang Oilfield Company,Exploration Division,Karamay,Xinjiang 834000,China)

机构地区：[1]中国石油新疆油田分公司勘探开发研究院,新疆克拉玛依834000 [2]中国石油新疆油田分公司勘探事业部,新疆克拉玛依834000

出　　处：《新疆石油地质》2022年第6期743-749,共7页Xinjiang Petroleum Geology

基　　金：中国石油前瞻性基础性技术攻关项目(2021DJ1803)。

摘　　要：准噶尔盆地玛湖凹陷二叠系风城组发育富含油气的陆相混积岩,岩性变化快,矿物种类多,利用常规测井无法有效识别岩性。利用岩性扫描测井,获得地层中主要元素的质量分数,根据矿物敏感元素与矿物的关系计算矿物质量分数。利用长英质矿物含量与碳酸盐矿物含量的比值构建混积岩指数,利用中子孔隙度与核磁共振总孔隙度的差值构建泥质指数,将混积岩指数与泥质指数交会形成风城组混积岩岩性识别图版。结果表明,矿物含量计算精度高,平均相对误差仅为6.5%,岩性解释符合率为90.9%,满足测井评价的需求,可为混积岩型页岩油藏的测井岩性识别提供借鉴。Hydrocarbonrich continental diamictite developed in the Permian Fengcheng formation of Mahu sag,Junggar basin is characterized by varieties of minerals and rapid variation of lithology.Conventional logging cannot be used to effectively identify the lithology of diamictite.By using lithology scan logging,the mass fractions of the main elements in the formation are obtained,and the mineral mass fraction is then calculated according to the relationship between mineralsensitive elements and minerals.The diamictite index is constructed by using the ratio of felsic mineral content to carbonate mineral content,and the shale index is constructed by using the difference between neutron porosity and nuclear magnetic resonance total porosity.Then the lithology identification chart for the diamictite in the Fengcheng formation is formed by intersecting the diamictite index and the shale index.The results show that the calculation of mineral content is accurate with the average relative error of only 6.5%,and the lithology interpretation exhibits a coincidence rate of 90.9%,which meets the needs of logging evaluation.The proposed method provides a reference for logging lithology identification of diamictite shale reservoirs.

关 键 词：玛湖凹陷 风城组 岩性扫描测井 岩性识别 混积岩 交会图版 矿物 

分 类 号：P631[天文地球—地质矿产勘探]