高精度矿物组分解释方法在致密砂岩岩相评价中的应用——以川西广元工农镇须家河组二段露头为例  

Application of high precision mineral component interpretation method in lithofacies evaluation of tight sandstone:Take the outcrop of the second member of Xujiahe Formation in Gongnong Town,Guangyuan,western Sichuan as an example

作　　者：赵俊威 陈恭洋 赵星[3] 罗旭 聂昕[5] 印森林 王恒 陈旭 ZHAO Junwei;CHEN Gongyang;ZHAO Xing;LUO Xu;NIE Xin;YIN Senlin;WANG Heng;CHEN Xu(Key Laboratory of Exploration Technologies for Oil and Gas Resources,Ministry of Education(Yangtze University),Wuhan 430100,Hubei;Institute of Mud Logging Technology and Engineering,Yangtze University,Jingzhou 434023,Hubei;Exploration and Production Engineering Supervision Center,Research Institute of Petroleum Exploration&Development,PetroChina,Beijing 100089;Liaohe Branch,China National Logging Corporation,Panjin 124010,Liaoning;College of Geophysics and Petroleum Resources,Yangtzeu University,Wuhan 430100,Hubei)

机构地区：[1]油气资源与勘探技术教育部重点实验室(长江大学),湖北武汉430100 [2]长江大学录井技术与工程研究院,湖北荆州434023 [3]中国石油勘探开发研究院勘探与生产工程监督中心,北京100089 [4]中国石油集团测井有限公司辽河分公司,辽宁盘锦124010 [5]长江大学地球物理与石油资源学院,湖北武汉430100

出　　处：《长江大学学报（自然科学版）》2024年第3期36-46,共11页Journal of Yangtze University(Natural Science Edition)

基　　金：国家自然科学基金项目“海相浪控砂质临滨坝沉积构型差异性及沉积动力学机制研究”(41902155),“冲积扇储层孔隙结构复杂模态成因机制及其分布模式”(41502126)。

摘　　要：针对致密砂岩优质储层受岩石组分控制,岩石组分在垂向上变化较快等问题,对储层岩相准确划分是评价致密砂岩储层质量的重要因素。以川西广元工农镇须家河组二段(以下简称须二段)露头剖面为例,在钻取239块露头样品的基础上,对样品进行了XRF(X射线荧光光谱)元素扫描及电子能谱实验,建立了高精度矿物组分解释模型。模型结果表明:Herron模型和多元线性回归分析模型均可较好地反映矿物的变化趋势,但Herron模型对于伊利石、钾长石、斜长石、绿泥石及白云石的解释精度较差;而多元线性回归分析模型解释结果与扫描能谱测试结果的误差很小,能够更好地解释出不同类型矿物的含量。利用多元线性回归分析模型解释结果对须二段露头进行高精度岩相解释,精度远高于岩样描述解释的岩相,将岩相细分为6大类14小类,由底部至顶部石英含量逐渐减少,造成底部富石英段孔隙度好于上部层段,露头区有利岩相包括含长石岩屑中粒石英砂岩、含长石岩屑粗粒石英砂岩、含长石中粒石英砂岩、中粒石英砂岩、钙质中粒石英砂岩。Aiming at the problems of high-quality tight sandstone reservoir controlled by rock composition,which changes rapidly in vertical direction,accurate classification of reservoir lithofacies is an important factor to evaluate the quality of tight sandstone reservoir.Taking the outcrop of the second member of Xujiahe Formation in Gongnong Town,Guangyuan,western Sichuan as an example,XRF(X-ray fluorescence spectroscopy)element and scanning electron spectroscopy experiments were carried out based on the 239 outcrop samples drilled,a high-precision mineral component interpretation model has been established.The model results show that both Herron model and multiple linear regression analysis model can reflect the changing trend of minerals well,but the Herron model has poor interpretation accuracy for illite,kalifeldspar,plagioclase,chlorite and dolomite.The error between multiple linear regression analysis model and scanning energy spectrum test is very small,which can better explain the content of different types of minerals.The multiple linear regression analysis model is used to interpret the high precision lithofacies of the outcrop of the second member of Xujiahe Formation,and the accuracy is much higher than that of the rock sample description interpretation,the lithofacies are divided into 6 categories and 14 sub-categories,the quartz content gradually decreases from the bottom to the top,resulting in the porosity of the quartz-rich section at the bottom is better than that of the upper section.The favorable lithofacies in the outcrop area include medium-grained quartz sandstone with feldspar debris,coarse-grained quartz sandstone with feldspar debris,medium-grained quartz sandstone with feldspar debris,medium-grained quartz sandstone with feldspar,medium-grained quartz sandstone and calc medium-grained quartz sandstone.

关 键 词：致密砂岩 有利岩相 矿物组分 XRF元素 须家河组二段 露头 

分 类 号：TE132.14[石油与天然气工程—油气勘探]