CAJ | 학술논문

为了认识黏土矿物对油层低电阻率化的影响,以薄片、扫描电镜、X射线衍射、测井解释和试油结果为依据,对吴起地区长61油层黏土矿物特征及其对电阻率的影响进行了研究。结果表明,黏土矿物对低电阻率油层的形成具有控制作用,具体表现在3个方面：第一为附加导电作用,以网状伊/蒙混层矿物最强,是油层电阻率降低的关键因素;第二为对孔隙结构的改造,导致束缚水饱和度增高,电阻率降低,以伊利石最为明显;第三是对水分子的吸附作用,以绿泥石等为主。综合三者的作用大小和矿物含量,吴起地区黏土矿物对电阻率的影响程度依次为：伊利石〉伊/蒙混层〉绿泥石〉高岭石。此项研究可对低电阻率油层的存在机理和分布进行有效解释和预测。
위료인식점토광물대유층저전조솔화적영향,이박편、소묘전경、X사선연사、측정해석화시유결과위의거,대오기지구장61유층점토광물특정급기대전조솔적영향진행료연구。결과표명,점토광물대저전조솔유층적형성구유공제작용,구체표현재3개방면：제일위부가도전작용,이망상이/몽혼층광물최강,시유층전조솔강저적관건인소;제이위대공극결구적개조,도치속박수포화도증고,전조솔강저,이이리석최위명현;제삼시대수분자적흡부작용,이록니석등위주。종합삼자적작용대소화광물함량,오기지구점토광물대전조솔적영향정도의차위：이리석〉이/몽혼층〉록니석〉고령석。차항연구가대저전조솔유층적존재궤리화분포진행유효해석화예측。
In order to understand the effect of clay minerals on low resistivity reservoirs,the slice,scanning electronic microscope,X-ray diffraction,logging interpretation and oil testing results were applied to study the effect of clay minerals on resistivity of Chang 61 reservoir in Wuqi area.The result shows that clay minerals play a dominate role on the forming of low resistivity reservoir.The role displays in the following three aspects： the role mainly is additional conductivity,and it is strongest in the illite/smectite mixed layer and is the key factor for resistivity decline;followed by the pore structure reformation which caused the bound water saturation increasing and resistivity decline,and it is most in illite;and then the absorption of water molecule which is mainly in chlorite.By considering the effects and mineral content,it was believed that the order of effect of clay minerals on resistivity is： illite illite/semectite mixed layer chlorite kaolinite.This study result can be used to interpret the mechanism and predict the distribution of low resistivity reservoir.