长岭凹陷腰南5井嫩江组烃源岩地化特征及油源对比研究

Study on geochemical characteristics and oil-source rock correlation of Nenjiang formation of Yaonan- 5 well,Changling sag

为了证实长岭凹陷嫩江组烃源岩发育程度以及嫩江组四段原油与嫩江组一段、二段烃源岩关系,通过长岭凹陷腰南5井嫩江组一、二段泥岩生潜指标的系统取样评价,采用有机碳、岩石热解和饱和烃色质谱分析方法,证实嫩江组烃源岩中的油页岩段有机碳大于10%,生烃潜量大于100 mg/g,有机质类型为Ⅰ、Ⅱ1、Ⅱ2型,总体上为腐泥型、腐殖腐泥型,有机质类型好。精细对比腰南5井嫩四段原油与嫩一段、嫩二段以及青山口组烃源岩分子地球化学特征,明确了嫩江组一段顶部-二段底部泥岩和嫩江组四段原油具有亲缘关系。

In order to confirm the hydrocarbon source rock development degree of Nenjiang formation and the relation between crude oil from member-4 and source rocks of member-1 and member-2,through systematic sampling and evaluation of potential index of source rocks of member-1 and member-2 from Nenjiang formation,by adopting the organic carbon,rock pyrolysis and saturated hydrocarbon mass spectrometry method of color,the organic carbon of hydrocarbon source rocks in Nenjiang formation is more than10%and the hydrocarbon generation potential amount is more than 100 mg/g,and the organic matter types are typeⅠ,typeⅡ1,and typeⅡ2,generally of sapropel type- humus sapropel type,and the organic matter type is good.Through fine correlation of molecular geochemical characteristics between crude oil in member-4 and source rocks of member-1 and member-2,and those in Qinshankou formation,the crude oil in member-1 top,member-2 bottom and that of in member-4 of Nenjiang formation are proved to have the genetic relationship.