马寨油田低电阻率油层测井方法研究

马寨油田沙三中、下段地层中存在着低电阻率油气层，其计算含油饱和度低于50％，束缚水饱和度可达60％以上。马寨地区地层水矿化度高，使地层导电能力增强，电阻率降低，形成低含油饱和度、低电阻率油层。根据这一主要特点，以确定地层束缚水饱和度为主要目的，从确定粒度中值入手，利用自然伽马及中子、密度测井资料来评价这一地层参数。利用钻井取心分析化验结果和粒度中值，计算地层束缚水饱和度。采用油藏理论综合分析储层流体动态，利用束缚水饱和度与地层含水饱和度评价油气层，并建立了一整套计算方程和解释图版。

Study of well logging method for reservoir with low resistivity in Mazhai Oilfield

There exists the reservoir with low resistivity in upper and lower layers in Es 3 formation,Mazhai Oilfield.Computed oil saturation is lower than 50% and its bound water saturation is 60% and above in this kind of reservoir.Adding formation water with higher salinity,conductibility is increased and resistivity is decreased,formed the reservoir with low oil saturation and low resistivity.Based on the feature,we use natural gamma neutron logging and density logging to appreciate the formation parameters.We use analyzed results of drill cores and median grain diameter to compute bound water saturation of formation.The reservoir fluid dynamics is synthetically analyzed by using reservoir theory,the reservoir is appreciated by bound water saturation and formation water saturation.A set of formula and drawing board for interpretation has been created.