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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
付晓燕1,2 王 华1,2 冯炎松1,2 时 卓1,2 张保国1,2
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作者单位: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
中文关键字: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
英文关键字:Eastern Ordos Basin: Mizhi area; Middle Permian; Shihezi Formation; Reservoir characteristics; Lower property limit
中文摘要:    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。
英文摘要: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.
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国内统一连续出版物号:CN51-1159/TE |国内发行代码: |国际标准出版物号:ISSN1673-3177 |国际发行代码:
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