| 低阻油层成因分析及识别方法—以鄂尔多斯盆地盐池地区延长组长4+5段为例 |
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| 引用本文： | 马晓丽,王洪君,李军建,等.低阻油层成因分析及识别方法—以鄂尔多斯盆地盐池地区延长组长4+5段为例[J].地质学刊,2019,43(2):275-281. |
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| 作者姓名： | 马晓丽 王洪君 李军建 等 |
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| 作者单位： | 西安石油大学地球科学与工程学院 |
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| 基金项目： | 国家自然科学基金项目（41102082），陕西省科技厅研究发展计划项目（2012JQ5011）,陕西省教育厅重点研究计划（17JS109）,西安石油大学研究生创新与实践能力培养项目（YCS18112015） |
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| 摘 要： | 近年来，低阻油层在鄂尔多斯盆地三叠系延长组不断被发现，逐渐成为主要产油层。针对鄂尔多斯盆地盐池地区长4+5低阻油层，通过岩芯观察、铸体薄片鉴定、扫描电镜观察、黏土矿物X射线衍射及高压压汞等分析测试，研究该地区长4+5低阻油层成因，认为构造圈闭幅度低、束缚水饱和度与地层水矿化均较高等是造成油层电阻率低的主要因素。利用交会图版法、电阻率差异法及计算自然电位差法3种方法，结合试油资料，对低阻油层进行定性识别。
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| 关 键 词： | 盐池地区 延长组长4+5 低阻油层 成因 识别方法 鄂尔多斯盆地 |
Genetic analysis and identification methods of low-resistivity oil layer: An example of the Chang 4+5 members of the Yanchang Formation in the Yanchi area, Ordos Basin |
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| Ma Xiaoli,Wang Hongjun,Li Junjian,et al.Genetic analysis and identification methods of low-resistivity oil layer: An example of the Chang 4+5 members of the Yanchang Formation in the Yanchi area, Ordos Basin[J].Jiangsu Geology,2019,43(2):275-281. |
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| Authors: | Ma Xiaoli Wang Hongjun Li Junjian |
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| Abstract: | In recent years, low-resistivity oil layers have been continuously discovered in the Triassic Yanchang Formation of the Ordos Basin, which have grown to be the main production layer. This work studied the Chang 4+5 members low-resistivity oil layer in the Yanchi area of the Ordos Basin by core observation, casting thin section identification, scanning electron microscopy, clay mineral X-ray diffraction and high pressure mercury intrusion. The results show that low structural amplitude, high irreducible water saturation and high formation water salinity are the main factors for the low resistivity of this oil layer. Combined with oil test data, three methods of cross plots, resistivity difference method and calculation of spontaneous potential difference method were used to qualitatively identify the low-resistivity oil layer. |
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| Keywords: | Yanchi area Chang 4+5 members of Yanchang Formation low-resistivity oil reservoir genesis identification method Ordos Basin |
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