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一种陆相页岩油岩相测井定量识别方法

Logging quantitative identification method for lithofacies of continental shale oil
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摘要 随着中国页岩油勘探开发进程的推进,页岩油已成为当前国内寻找油气资源的重要领域.纯页岩型页岩油作为陆相页岩油类型之一,与国内外其他盆地页岩油相比,其具有黏土含量高、岩石矿物成分复杂、纹层及页理异常发育等典型特点.为了深化页岩油储层岩相特征认识,笔者基于岩心精描、XRD全岩分析和测井新技术等多种资料,依据“岩石成分+沉积构造”的岩相划分方案,建立了古龙页岩油岩相测井识别方法,实现了页岩岩相的定量识别与表征.(1)构建青一段元素-矿物转换模型,准确计算岩石矿物成分,依据不同岩性测井响应差异,建立以元素测井为主,常规测井为辅的岩性识别方法,将青一段页岩划分为4类,即黏土质页岩、长英质页岩、介壳灰岩/白云岩和粉砂岩;(2)充分发挥电成像测井高分辨率特性,提出利用电成像测井单位窗长范围内微电极曲线平均极值变化数量化表征岩石沉积构造,不仅弥补了传统动静态图像和切片图像对毫米级纹层分辨能力不足的难题,而且实现了定量表征,提高了岩石沉积构造的识别精度;(3)基于岩石成分和沉积构造的相互耦合,结合研究区实际岩相特征,系统将古龙页岩划分为8种岩相类型,实现了古龙页岩油岩相测井定量表征方法,识别结果与岩心描述具有很好一致性,可为后续页岩油优势岩相分析提供技术支撑. Shale oil has become an important field of domestic oil and gas resources.Pure shale oil is one of continental shale oil types,compared with shale oil in other basins at home and abroad,it has the typical characteristics of high clay content,complex rock and mineral composition,abnormal development of lamina and foliation.Due to its special resource endowment conditions and reservoir characteristics,the overall research is still in the initial stage.In order to deepen the understanding of Gulong shale oil lithofacies characteristics,based on core observation,element analysis and new logging technology,a quantitative identification method is established according to the lithofacies classification plan of"mineral composition-Sedimentary structure".The method is as follows:(1)The element-mineral conversion model of the first member of Qingshankou Formation("Qing1 Formation")was established to accurately calculate the rock mineral composition.According to the logging response differences of different lithologies,a lithology identification method based on conventional and elemental logging was established,and the shale of Qing1 Formation was divided into four categories,namely,argillaceous shale,feldspathic shale,limestone/dolomite and siltstone;(2)Based on fine description of core and imaging logging,a quantitative characterization of rock sedimentary structure is proposed by using the average extreme value variation of imaging logging microelectrode curve in unit window length range,which makes up for the lack of resolution of laminar and foliation in dynamic and static images and slice images,and improves the vertical resolution of sedimentary structure;(3)Based on the coupling of rock mineral composition and sedimentary structure,and combined with the actual lithofacies characteristics,the Gulong shale in the northern Songliao Basin is divided into eight lithofacies types.This method provides an important basis for shale oil dominant lithofacies analysis.
作者 田瀚 闫伟林 武宏亮 闫学洪 李潮流 郑建东 冯周 TIAN Han;YAN WeiLin;WU HongLiang;YAN XueHong;LI ChaoLiu;ZHENG JianDong;FENG Zhou(Research Institute of Petroleum Exploration and Development,PetroChina,Beijing 100083,China;Exploration and Development Research Institute of Daqing Oilfield Co.,Ltd.,Daqing 163712,China;PetroChina Well Logging Company Limited,Daqing Branch,Daqing 163412,China)
出处 《地球物理学进展》 CSCD 北大核心 2023年第5期2122-2134,共13页 Progress in Geophysics
基金 中国石油天然气股份有限公司科技重大专项项目(2021ZZ10-01) 中国石油天然气集团有限公司关键核心技术攻关项目(2021ZG07)联合资助。
关键词 松辽盆地 陆相页岩油 岩相 矿物组分 沉积构造 定量识别 Songliao basin Continental shale oil Lithofacies Mineral composition Sedimentary structure Quantitative identification
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