海拉尔盆地外围凹陷南一段烃源岩生烃动力学研究

为了厘清海拉尔盆地外围红旗、东明和伊敏凹陷南屯组一段烃源岩的生烃潜力和现处的生烃演化阶段，采用封闭体系黄金管高压釜对南一段烃源岩进行了生烃动力学研究，结果表明：气态烃动力学参数差异较大，伊敏凹陷主频活化能最高，红旗凹陷次之，东明凹陷最低。液态烃动力学参数中红旗凹陷平均和主频活化能最低，伊敏凹陷活化能分布表现为双峰特征，东明凹陷主频活化能最高，伊敏次之，红旗凹陷最低。研究区寻找气藏的可能性很低，生烃史恢复结果表明南一段烃源岩于早白垩世进入生油门限，现今仍处于低成熟-成熟阶段早期，油的转化率12.67%～39.50%，仅发生少量排烃。制约生油量的最主要因素是有机质未达到生烃高峰，致使生烃量及资源量有限，油气勘探的重点在于寻找其下部铜钵庙组、塔木兰沟组古地温相对较高、生油潜力较强的烃源岩或南屯组烃源岩局部成熟区域。

Hydrocarbon generation kinetics of source rocks of the first member of Nantun Formation in peripheral sags of Hailar Basin

In order to clarify the hydrocarbon generation potential and present hydrocarbon generation evolution stage of the source rocks of the first member of Nantun Formation in Hongqi,Dongming and Yimin sags on the periphery of Hailar Basin,the hydrocarbon generation kinetics of the source rocks of the first member of Nantun Formation was studied by using a confined system gold tube autoclave.The results show that the kinetic parameters of gaseous hydrocarbons in each sag are quite different,and the main frequency activation energy increases orderly from Dongming sag to Hongqi and Yimin sags.Among the kinetic parameters of liquid hydrocarbon,the average and main frequency activation energy in Hongqi sag are the lowest,the distribution of activation energy in Yimin sag shows double peak characteristics,and the main frequency activation energy increases orderly from Hongqi sag to Yimin and Dongming sags.The possibility of searching for gas reservoirs in the study area is very low.The result of hydrocarbon generation history recovery indicates that the K1 n1 source rocks entered the oil generation threshold in early Cretaceous,and are still in the early stage of low maturity to maturity.The oil conversion rate is 12.67%-39.50%,and only a small amount of hydrocarbon expulsion occurs.The key factor restricting oil generation is that organic matter has not reached the peak of hydrocarbon generation,resulting in limited hydrocarbon generation and resources.The focus of oil and gas exploration is to find source rocks of Tongbomiao Formation and Tamulangou Formation in the lower part with relatively high paleotemperature and strong oil generation potential or local mature areas of source rocks of Nantun Formation.