收稿日期: 2007-08-01
修回日期: 2008-03-01
网络出版日期: 2008-06-10
Characteristics and Estimation Technology of Oil and Gas Reservoirs with Low Resistivity
Received date: 2007-08-01
Revised date: 2008-03-01
Online published: 2008-06-10
低电阻率油气储集层是指油气层电阻率与邻近水层电阻率反差较小的一类油气储层,这种油气储层给测井精细解释、油气层的识别与评价带来了极大的困难。介绍了低电阻率油气储集层的概念及特征,造成低电阻率油气储集层的主要和次要矿物成分,以及由于蒙脱石等粘土矿物的附加导电性、钻井液侵入储层形成电阻率的基本岩石物理成因,总结出了低电阻率油气层的地质成因和工程成因2大类成因机制；还介绍了目前常用的地质录井参数解释、测井解释、气测参数和地化参数以及核磁共振测井技术评价低电阻率油层的方法，列举了通过分析试油层的岩心、测井、录井资料建立模型和运用测井、完井资料综合评价低电阻率油气储集层的实例。
汪忠德,;王新海;王锦芳;何幼斌;吴锦伟;刘洪;陈河清 . 低电阻率油气储集层特征和评价技术研究[J]. 天然气地球科学, 2008 , 19(3) : 390 -395 . DOI: 10.11764/j.issn.1672-1926.2008.03.390
The conventional logs are proven to be effective in assessing the general reservoirs. However, it is still difficult to determine the petrophysical parameters for low resistivity reservoirs through those conventional logging data. This paper introduces the concept and the characteristics of the oil and gas reservoir with low resistivity and analyzes the main mineral constituents causing low resistivity. It is found that the most important factor causing the low resistivity of oil and gas reservoirs is the additional conductivity due to the clay in the formation and the invasion influence of drilling mud on the oil pay resistivity. There are two mechanisms for forming low resistivity reservirs: geological genesis and engineering genesis. The paper also analyzes the lithology, clay, pore structure and wettability of the reservoir, and introduces the evaluation methods for the reservoir, such as geochemical logging, wireline logging, gas logging and NMR technology. Four cases for establishing models and evaluating the low eresistivity reservoir are presented.
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