国外某浅层盐上构造油气田测井评价方法

LOGGING INTERPRETATION AND EVALUATION METHOD IN SHALLOW LAYERS OF UPPER SALT STRUCTURE RESERVOIRS

该油气田为盐上构造背景下受构造、岩性双重控制的油气田。油气藏埋深较浅,一般小于600米,地层岩性从下到上为盐、石膏、灰岩、砂岩。油气主要产自砂岩储层。储层泥质含量高、含钙,以粉砂岩、细砂岩为主。地层水矿化度较高,造成储层电性较低,电阻率1.5欧姆米即可产油。在该油气田的测井评价中,需要注意两点：第一,低电阻率油气层的识别,电性上稍有隆起或变化,需着重分析。第二,对于泥质重、物性差的储层,要结合构造位置分析,不可轻易放弃。

XX oilfield is a deposit which is controlled by both structure and lithology.The reservoirs are shallow layers and the buried depth is less than 600m.From the bottom up the lithology in XX oilfield are salt,gypsum,limestone and sandstone.The hydrocarbon produces from sandstone.The sandstone grain size is fine with high shale content and calcite content,and the formation is dominated with silt and fine sand.The high salinity of formation water made the resistivity low,formation with resistivity of 1.5 ohm.m can be oil zones.There are two key points in logging interpretation and evaluation in XX oilfield.First,How to identify low resistivity oil and gas reservoir.Second,for the high shale content intervals the structure position should be considered.