鄂尔多斯盆地东部米脂地区石盒子组8段储层特征及物性下限确定  

Reservoir characteristics and lower property limits of Shihezi 8 Member,Mizhi area,eastern Ordos Basin

作　　者：付晓燕[1,2] 王华[1,2] 冯炎松[1,2] 时卓[1,2] 张保国[1,2] Fu Xiaoyan;Wang hua;Feng Yansong;Shi Zhuo;Zhang Baoguo(Exploration and Development Research Institute,PetroChina Changqing Oilfield Company,Xi’an,Shaanxi 710021,China;National Engineering Laboratory of Low-Permeability Oil&Gas Exploration and Development,Xi’an,Shaanxi 710021,China)

机构地区：[1]中国石油长庆油田公司勘探开发研究院 [2]低渗透油气田勘探开发国家工程实验室

出　　处：《天然气勘探与开发》2022年第1期33-39,共7页Natural Gas Exploration and Development

摘　　要：气田目的层段储层特征及其物性下限是储量评价中识别储层、确定有效厚度的关键因素,同时也是一个气田后期能否规模有效开发的前提条件。鄂尔多斯盆地东部米脂地区上古生界二叠系中统石盒子组8段、山西组1、2段以及太原组不同程度含气,属于典型的多层段含气致密砂岩气藏。石盒子组8段在几个主力层中产气贡献能力达到25%,该段储层在研究区占有重要的地位。本次研究以石盒子组8段致密砂岩储集层为主要研究对象,充分利用各类分析测试、测井解释、试气成果等资料,分析储层基本特征,采用经验统计法、测试法、压汞法及泥质含量法等4种方法综合确定有效储集层物性下限。研究结果表明:①米脂地区石盒子组8段属于典型的特低孔、低—特低渗致密砂岩储集层,其孔隙度下限为3.8%,渗透率下限为0.09 mD;②石盒子组8段层单试气资料验证结果显示,物性下限标准与实际资料吻合程度高,准确率达到95%;③本次综合确定的物性下限标准科学有效,后期可为米脂地区石盒子组8段天然气开发有利目标区预测及资源评价提供可靠的依据。In a gasfield,both reservoir characteristics and lower property limits are crucial to reservoir identification and net pay thickness definition in reserve estimation,and they are the prerequisites to large-scale efficient field development.In Mizhi area,eastern Ordos Basin,the Middle Permian Shihezi 8 Member,Shanxi 1 and 2 members,and Taiyuan Formation are typical tight sandstone gas reservoirs.Shihezi 8 Member contributed 25%of total gas deliverability among these reservoirs.So,taking the Shihezi 8 tight sandstone reservoirs as objectives,their characteristics were studied based on experimental analysis,well-logging interpretation,and gas testing.Moreover,the lower property limits of effective reservoirs were determined by four methods of empirical statistics,testing,mercury injection,and shale content.Results show that(1)the Shihe 8 Member in Mizhi area is typical tight sandstone reservoirs with extremely low porosity and low to extremely low permeability.Lower limits of both porosity and permeability are 3.8%and 0.09 mD,respectively;(2)these limits agree with real data with the accuracy of 95%,which has been demonstrated by well testing;and(3)the lower limits are scientific and effective,which may provide reliable evidence for favorable zone prediction and resource evaluation on Shihezi Member in this area.

关 键 词：鄂尔多斯盆地东部 米脂地区 中二叠世 石盒子组 储层特征 物性下限 

分 类 号：P618.13[天文地球—矿床学]