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根据测井曲线、岩心物性、压汞曲线、薄片、水性分析、试油等资料,对鄂尔多斯盆地郑寨子地区长6低阻油层的形成进行了详细研究。长6低阻油层形成的主要原因有三个方面,即:高束缚水饱和度、高矿化度地层水及工程施工影响。认为高束缚水饱和度是长6形成低电阻率油层的主要原因。为了提高测井解释精度,提出适合本地区低阻识别的方法,主要包含声波时差与视自然电位差交会图识别法、气测录井法和核磁共振测井法。
The formation of Chang 6 low resistivity reservoir in Zhengzhaizi area, Ordos Basin, has been studied in detail based on well logs, core properties, mercury intrusion curves, thin slices, water analysis and oil testing. There are three main reasons for the formation of Chang 6 low-resistivity oil layer: high irreducible water saturation, high salinity formation water and construction impact. It is considered that the high irreducible water saturation is the main reason for the formation of low resistivity reservoirs. In order to improve logging interpretation accuracy, a method suitable for low resistance identification in this area is proposed, which mainly includes cross-plot identification of acoustic transit time and apparent potential difference, gas logging method and NMR logging method.