Characteristics and Estimation Technology of Oil and Gas Reservoirs with Low Resistivity

WANG Zhong-de ;WANG Xin-hai ;WANG Jin-fang ; HE You-bin ;WU Jin-wei ;LIU Hong ;CHEN He-qing

doi:10.11764/j.issn.1672-1926.2008.03.390

Natural Gas Geoscience >

2008 , Vol. 19 >Issue 3: 390 - 395

DOI: https://doi.org/10.11764/j.issn.1672-1926.2008.03.390

Characteristics and Estimation Technology of Oil and Gas Reservoirs with Low Resistivity

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(1. MOE Key Laboratory of Exploration Technologies for Oil and Gas Resources, School of Earth Sciences,
Yangtze University, Jingzhou 434023,China; 2.Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China)

Received date: 2007-08-01

Revised date: 2008-03-01

Online published: 2008-06-10

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Abstract

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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Key words： Low resistivity oil and gas reservoir; Low resistivity oil layer; Mineral composition; Origin analysis; Interpretation and evaluation technique

Cite this article

WANG Zhong-de ;WANG Xin-hai ;WANG Jin-fang ; HE You-bin ;WU Jin-wei ;LIU Hong ;CHEN He-qing . Characteristics and Estimation Technology of Oil and Gas Reservoirs with Low Resistivity[J]. Natural Gas Geoscience, 2008 , 19(3) : 390 -395 . DOI: 10.11764/j.issn.1672-1926.2008.03.390

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