桥镇地区长7、长8储层孔隙结构及其分形特征  

Pore structure and fractal characteristics of Chang 7 and Chang 8 reservoirs in Qiaozhen area

作　　者：张道亮 杨蒙 刘玺 高卓林 李锦锋 ZHANG Daoliang;YANG Meng;LIU Xi;GAO Zhuolin;LI Jinfeng(Yanchang Oilfield Exploration and Development Technology Research Center,Yan'an Shaanxi 716000,China;Xiasiwan Oil Production Plant,Yanchang Oilfield Co.,Ltd.,Ganquan Shaanxi 716100,China)

机构地区：[1]延长油田勘探开发技术研究中心,陕西延安716000 [2]延长油田股份有限公司下寺湾采油厂,陕西甘泉716100

出　　处：《石油化工应用》2025年第2期88-92,共5页Petrochemical Industry Application

摘　　要：低孔低渗储层的孔喉结构特征对致密油藏的勘探开发效果有着重要影响。本文以鄂尔多斯盆地南部桥镇区长7、长8储层为例,综合薄片、常规物性分析、压汞分析等手段,明确了储层的基本特征,利用分形理论定量表征了储层的孔喉结构。结果表明:(1)研究区长7、长8储层岩性均以长石砂岩为主,但长8储层物性、面孔率、孔喉大小要优于长7;(2)长7、长8储层具有宽平台、较宽平台、较窄平台、窄平台四类孔隙结构,储集性能和渗流能力依次减弱;(3)两类储层都具有多段分形的特征,长7储层平均分形维数为2.737;长8储层平均分形维数为2.641,表明长7储层的非均质性更强,孔隙结构更复杂。研究成果可以为低渗透油藏储层精细评价和高效开发提供依据。The pore throat structure of low porosity and low permeability reservoirs has a significant impact on the exploration and development effectiveness of tight oil reservoirs.This article takes the Chang 7 and Chang 8 reservoirs in the southern Qiaozhen district of the Ordos Basin as an example,and comprehensively uses methods such as thin section,conventional physical property analysis,and mercury intrusion analysis to clarify the basic characteristics of the reservoirs.The pore throat structure of the reservoirs is quantitatively characterized using fractal theory.The results show that,(1)the lithology of the reservoirs in the study area of Chang 7 and Chang 8 is mainly feldspathic sandstone,but the physical properties,porosity,and pore throat size of the Chang 8 reservoir are better than those of Chang 7.(2)Chang 7 and Chang 8 reservoirs have four types of pore structure,wide platform,wide platform,narrow platform and narrow platform,and the reservoir performance and seepage capacity are weakened successively.(3)Both types of reservoirs exhibit multi fractal characteristics,the average fractal dimension of Chang 7 reservoir is 2.737.The average fractal dimension of Chang 8 reservoir is 2.641,indicating that the Chang 7 reservoir has stronger heterogeneity and more complex pore structure.The research results can provide a basis for fine reservoir evaluation and efficient development of low-permeability reservoirs.

关 键 词：延长组 储层特征 孔隙结构 分形特征 

分 类 号：TE122.23[石油与天然气工程—油气勘探]