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长2油层组是南泥湾油田的重要含油层系之一,地层厚度100~150m,是一套以细粒长石为主的砂泥岩地层。油藏的分布主要受沉积相带与成岩后生作用控制,储层以分流河道砂体为主。油层钻遇不稳定,含水率高,具有低孔、低渗、低含油的特点,油、水层差异不明显。本文综合分析了长2储层的岩性、物性、含油性特征;研究了储层四性关系;对比试油数据总结了产油层与产水层的测井曲线特征和主要曲线的测井解释下限值。
The Chang 2 reservoir is one of the major oil-bearing formations in the Nanniwan Oilfield. The formation thickness is 100-150 m. It is a set of sand-shale formations mainly composed of fine-grained feldspar. The reservoir distribution is mainly controlled by sedimentary facies belt and diagenesis and the reservoir is mainly distributary channel sand body. The oil layer is not stable when drilling, with high water content, low porosity, low permeability and low oil content. There is no obvious difference between oil and water layers. In this paper, the lithology, physical property and oil-bearing characteristics of Chang 2 reservoir are analyzed synthetically; the reservoir quaternary relationship is researched; the logging data of oil reservoirs and aquifers are compared with the logging data of the main curves lower limit.