姬塬地区长8油层组储层特征分析  

Analysis of Reservoir Characteristics and Main Controlling Factors of Chang 8 Reservoir Group in Jiyuan Area,Ordos Basin

作　　者：廖宇斌[1] 李涛[2] 于志栋 肖骁 王守志 刘国文 LIAO Yu-bin;LI Tao;YU Zhi-dong;XIAO Xiao;WANG Shou-zhi;LIU Guo-wen(College of Earth Sciences,Jilin University,Changchun 130061,China;Key Laboratory of Oil and Gas Resources and Exploration Technology of the Ministry of Education,School of Earth Science,Changjiang University,Wuhan 430100,China;Petrochina Changqing Oilfield Company Changqing Industrial Group Co.,Ltd.,Xi'an 710018,China)

机构地区：[1]吉林大学地球科学学院,长春130061 [2]长江大学地球科学学院油气资源与勘探技术教育部重点实验室,武汉430100 [3]中国石油长庆油田公司长庆实业集团有限公司,西安710018

出　　处：《科学技术与工程》2024年第6期2246-2254,共9页Science Technology and Engineering

基　　金：国家科技重大专项(2008ZX05030,2011ZX05030,2017ZX05032)。

摘　　要：为确定长8油层储层现今表征,储层物性受黏土矿物胶结物控制模式,储层沉积作用和沉积后期所经历的成岩变化,通过铸体薄片、扫描电镜等方法研究了储层基本特征和成岩作用及沉积作用,在整体低渗的背景下,部分位于相对渗透率较高区域的油井有较高的产量,理清研究区长8储层富集规律,对地区内岩石孔隙度下降因素进行剖析。结果表明,姬塬地区有利储层多发育水下分流河道和河口坝沉积,特别是砂体中心部位储层物性是最好,可见长8油层组的储集性能和渗流性能好,即粒间孔型、粒间孔+溶孔型和溶孔+粒间孔型。溶孔型、粒间孔+微孔型两种孔隙组合类型的渗流性能较差。微孔型和溶孔+微孔型两种孔隙组合类型的储集空间主要由半径极小的微孔构成,连通性较差,其孔隙内表面积和渗流阻力,储集性能和渗流性能较差。In order to determine the current status of the reservoir in the Chang 8 oil layer,the basic characteristics of the reservoir and the diagenetic and sedimentary processes were investigated through methods such as thin section analysis and scanning electron microscopy.In the context of overall low permeability,it is found that higher production rates are observed in some oil wells located in areas of relatively high relative permeability.By understanding the enrichment patterns in the study area,factors contributing to the decrease in rock porosity are analyzed.The results indicate that the Jiyuan area has favorable reservoir development in underwater distributary channels and estuarine bar deposits,with the center of the sand bodies exhibiting the best reservoir properties.Therefore,the Chang 8 oil layer is found to have good reservoir and permeability performance,including intergranular pores,intergranular pores with dissolved pores,and dissolved pores with intergranular pores.On the other hand,the combination of dissolved pores and micro-pores as well as micro-pores alone is found to have poor flow performance.The reservoir space predominantly composed of extremely small micro-pores is observed to have low connectivity,resulting in lower internal surface area,flow resistance,and poorer reservoir and flow performance.

关 键 词：鄂尔多斯盆地 长8油层组 姬塬地区 储层特征 主控因素 

分 类 号：P618.130.21[天文地球—矿床学]