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疏松砂岩稠油层含油饱和度测井解释校正方法探讨 ——以济阳坳陷沾化凹陷馆陶组为例
耿斌,闫华,周德志,程紫燕,康元勇,韩连滨,胡兴中
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(1.中国石化胜利油田分公司勘探开发研究院,山东东营257015;2.中国石化胜利油田分公司油气勘探管理中心,山东东营257001)
摘要:
针对含油饱和度的测井解释过程中通常重视Archie公式中岩石电阻率参数的研究与选取,很少考虑油层中油水赋存状态的影响。浅层疏松砂岩稠油层具有与常规油层不同的油水赋存状态,以“孤立水滴”形式存在于孔隙体积中的水被油分隔,很难形成导电网络,导致利用Archie公式解释得到的稠油层含油饱和度值比实际值偏高,因此需要对饱和度的测井解释进行优化校正。本文选取济阳坳陷沾化凹陷馆陶组稠油油藏为研究目标,阐述了产生“孤立水滴”赋存方式的主要因素是储层孔隙结构,并以油基泥浆取心分析含油饱和度作为标准,采用实验分析和解释方程对比两种方式,通过CT图像分析、Archie公式、毛细管压力曲线反算含油高度和含水率方程反算等方法,初步确定解释值的校正量为4.1%~5.4%,平均为5%,这为浅层疏松砂岩稠油层的含油饱和度解释校正提供了依据,也为稠油层含油饱和度的校正研究提供了方法和思路。
关键词:  疏松砂岩  稠油层  含油饱和度  含水率方程  校正量
DOI:10.13673/j.cnki.cn37-1359/te.2020.04.005
基金项目:
Correction method of oil saturation in unconsolidated sandstone heavy oil reservoirs:A case study of Guantao Formation in Zhanhua Sag,Jiyang Depression
GENG Bin,YAN Hua,ZHOU Dezhi,CHENG Ziyan,KANG Yuanyong,HAN Lianbin,HU Xingzhong
(1.Exploration and Development Research Institute,Shengli Oilfield Company,SINOPEC,Dongying City,Shandong Province,257015,China;2.Oil and Gas Exploration Administration Center ,Shengli Oilfield Company,SINOPEC,Dongying City,Shandong Province,257001,China)
Abstract:
The selection of rock resistivity parameters in Archie formula is important during the logging interpretation of oil saturation. However,the influence of the oil and water occurrence mode in reservoirs is rarely considered. The oil and water occurrence mode in shallow unconsolidated sandstone heavy oil reservoirs is different from that in the conventional oil reservoirs. The pore water in the form of“isolated water droplets”is separated by oil,which makes it difficult to form a conductive network. As a result,the oil saturation of heavy oil reservoirs interpreted by Archie formula is higher than the actual one. Therefore,it is necessary to optimize and correct the saturation interpreted by logging data.In this study,the heavy oil reservoir of Guantao Formation in Zhanhua Sag,Jiyang Depression is selected as the research target to illustrate that the main factor influencing the occurrence of“isolated water droplets”in pore is the pore structure. And then the oil saturation analyzed by oil-based mud core is taken as the standard,the correction amount of the initial interpretation value is calculated to be 4.1%-5.4% with an average of 5% by the methods of experimental analysis and equation interpretation,such as CT scans,Archie formula,oil height and capillary pressure,and water cut equation. The results provide a basis for the interpretation and correction of the oil saturation in heavy oil reservoir,and provide a method for the oil saturation correction of shallow unconsolidated sandstone heavy oil reservoirs.
Key words:  unconsolidated sandstone  heavy oil reservoir  oil saturation  water cut equation  correction amount

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