基于分形理论、因子分析的储层分类评价依据——以苏北盆地溱潼凹陷阜三段为例  

Reservoir Classification and Evaluation Based on Fractal Theory and Factor Analysis:A case study of the Third member of the Funing Formation,Qintong Sag,Subei Basin

作　　者：程浩 金振奎[1] 余文端 李百强 朱小二 陈斌 吴珍珍 CHENG Hao;JIN ZhenKui;YU WenDuan;LI BaiQiang;ZHU XiaoEr;CHEN Bin;WU ZhenZhen(College of Geosciences,China University of Petroleum(Beijing)/State Key Laboratory of Petroleum Resources and Prospecting,Beijing 102249,China;China Petroleum&Chemical Corporation Eastern China Branch,Nanjing 210019,China;College of Resources and Environmental Engineering,Hefei University of Technology,Hefei 230009,China;CNOOC Research Institute Co.Ltd.,Beijing 100027,China;School of Earth Science and Engineering/Shaanxi Key Laboratory of Petroleum Accumulation Geology,Xi’an Shiyou University,Xi’an 710065,China)

机构地区：[1]中国石油大学(北京)地球科学学院/油气资源与探测国家重点实验室,北京102249 [2]中国石油化工股份有限公司华东分公司,南京210019 [3]合肥工业大学资源与环境工程学院,合肥230009 [4]中海油研究总院责任有限公司,北京100027 [5]西安石油大学地球科学与工程学院/陕西省油气成藏地质学重点实验室,西安710065

出　　处：《沉积学报》2023年第3期828-838,共11页Acta Sedimentologica Sinica

基　　金：国家自然科学基金项目(41872018);陕西省自然科学基础研究计划项目(2019JQ-151);中央高校基本科研业务费专项资金(JZ2021HGQB0 284)。

摘　　要：苏北盆地溱潼凹陷阜三段地层是一套浅水缓坡三角洲沉积,水体动荡水位变化频繁,岩性主要为泥页岩、泥质粉砂岩及细砂岩,分选差,非均质性强,常规单一物性参数难以准确表征储层性质。为明确苏北盆地溱潼凹陷阜三段储层物性及孔隙结构参数之间关系并总结储层分类依据,在明确地层主要孔隙类型的基础上,利用分形理论对地层物性参数及样品高压压汞实验数据加以分析,最终获得了砂体物性、孔隙结构与分形维数之间的相互关系。优选孔渗参数、孔隙结构系数、孔喉半径及孔喉分选系数5项参数作为主要参考因素,以此建立了以分形维数为基础的储层分类评价标准,并采用因子分析法对其适用性加以验证,将溱潼凹陷阜三段储层划分为3类:Ⅰ类中砂岩储层(D:2.31~2.42,D-=2.36);Ⅱ类细—粉砂储层(D:2.53~2.86,D-=2.75);Ⅲ类泥质储层(D:2.94~2.99,D-=2.97)。该研究为研究区储层结构定量化表征及储层类型判别提供了一种新的参考依据。The strata of the Third member of the Funing Formation in the Qintong Sag is a set of shallow-water gently sloping delta deposits,with evidence of frequent changes of water level.The lithology consists of poorly sorted and strongly heterogeneous shale,argillaceous siltstone and fine sandstone.As a result,conventional single physical property parameters do not accurately characterize the stratigraphic properties.In order to clarify the relationship between its physical properties and pore structure,and to summarize a discrimination basis for the sand body,the physical property data was analyzed together with high-pressure mercury injection experimental data.Fractal theory was used to specify the main pore types in the formation,and to obtain the relationship between physical properties,pore structure and fractal dimensions.Porosity,permeability,pore structure coefficient,mean pore throat radius and pore throat sorting coefficient were selected in this study as the main reference factors to develop a standard of formation classification based on fractal dimension analysis.Three types of strata were classified:Type Ⅰ.D = 2.31-2.42(mean 2.36);Type Ⅱ.D = 2.53-2.86(mean 2.75);Type Ⅲ.D = 2.94-2.99(mean 2.97).This provides a new reference basis for quantitative characterization of stratigraphic structure and discrimination between stratigraphic types in this area.

关 键 词：溱潼凹陷 阜三段 高压压汞实验 分形理论 因子分析 

分 类 号：P618.13[天文地球—矿床学]