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位于塔里木盆地DX油田的东河砂岩段储层是重要的海相碎屑岩储层,为确定研究区东河砂岩段储层物性下限和预测有利区,根据DX油田东河砂岩段的岩心、测井、试油等资料,对储层的岩性、物性、含油性和电性特征以及其相互关系开展研究。储层特征研究结果显示,DX油田东河砂岩段储层以岩屑石英砂岩为主,在测井曲线上表现为自然伽马和自然电位呈微锯齿状箱型,电阻率呈台阶状;平均孔隙度14.52%,平均渗透率282.3×10-3μm2,含油级别以含油和油浸为主,储层物性较好,含油级别较高。储层四性关系研究结果显示,岩性粒度越大,泥质含量越低,储层物性越好,含油级别越高,测井响应值显示为较低的密度值和较高的声波时差、中子值,储层的岩性、物性、含油性与电性之间具有较好的一致性。运用多种方法确定储层孔隙度下限为8%,渗透率下限为5×10-3μm2,储层平面分布显示研究区西北部DX7井区为有利区带。
The Donghe sandstone reservoir in the DX oil field of the Tarim Basin is an important marine clastic reservoir. To determine the reservoir physical property lower limit and prediction favorable area for the Donghe sandstone in the study area, according to the core of the Donghe sandstone in the DX oilfield, Logging, oil testing and other data, the reservoir lithology, physical properties, oil and electrical properties and their relationship to carry out research. The results of reservoir characterization show that the Donghe sandstone reservoir of DX Oilfield is dominated by lithic quartz sandstones, showing a jagged box shape with natural gamma ray and natural potential on the well logging curve, and the resistivity is step-shaped. The mean Porosity of 14.52% and average permeability of 282.3 × 10-3μm2. The oil level is dominated by oil and oil, and the reservoir properties are better with higher oil level. The results of reservoir quadrilateral relationship show that the larger the lithology, the lower the shale content, the better the reservoir physical properties, the higher the oil level, and the logging response value shows a lower density value and a higher acoustic jet lag. Neutron values, reservoir lithology, physical properties, oil and electrical properties have a good consistency. Various methods are used to determine the lower limit of reservoir porosity is 8% and the lower limit of permeability is 5 × 10-3μm2. The reservoir plane distribution shows that DX7 well in the northwest of the study area is a favorable zone.