【摘要】 塔中北部斜坡带产出原油Ｋ值分布于１００～１１６，且相对不变；而塔中低隆中央断垒带东段的原油，参数Ｋ不仅显示出高值（１２０～１５４），而且其分布空间呈现出明显规律性的变化，且甲基环己烷指数的变化与Ｋ值的变化颇为一致。这表明塔中北部斜坡带的原油与中央断垒带东段的原油轻烃特征存在明显差异，也显示塔中低隆中央断垒带东段部分原油具有混合特征。更多还原

【Abstract】 The ratio K,reported by Mango(1987),ranges from 1.09 to 1.16 in the oils produced in north slope of Tazhong area shows relative invariant;the K of oils trapped in the east part of Tazhong fault uplift shows not only high value(1.20～1.54),but also displays regular changes in the reservoirs.The index of methylcyclohexane shows similar variance to the ratio K.It indicates that the oils trapped in the north slope are different from the oils of light hydrocarbons in the east part of Tazhong fault uplift,and that some of the oils with high K value are formed by mixing procession.更多还原