摘要
为对准噶尔盆地芦草沟组烃源岩生烃潜力进行评价,本文结合地质剖面分析及前人研究成果,针对准噶尔盆地南缘芦草沟组富有机质泥页岩有机地球化学特征进行研究,按照剖面1-剖面3,芦草沟组内部的上、中、下3段的有机质类型、有机碳含量、有机质成熟度等方面进行对比分析,指出芦草沟组的非常规油气潜力。研究表明:(1)研究区内芦草沟组生油岩有机质丰度大,TOC含量为0.31%~22.21%,平均值5.16%。平面上,由西到东研究区芦草沟组平均TOC含量逐渐增加。垂向上,中段TOC最高,上段次之,下段最低;(2)通过最大热解峰温(Tmax)与氢指数(IH)关系的研究,研究区芦草沟组无论平面上或垂向上Ⅰ型、Ⅱ1型、Ⅱ2型及Ⅲ型干酪根均有发育,以Ⅰ型及Ⅱ1型干酪根为主,Ⅱ2、Ⅲ型次之;(3)研究区芦草沟组处于热成熟阶段,Ro峰值为0.9%,Tmax为429.0℃~440.0℃,可能发育良好的页岩油,平面上Ro值无明显变化。垂向上由浅到深,Ro值有逐渐增大的趋势;(4)成果表明芦草沟组沉积有机质已进入生油门限,具良好的油气勘探潜力。
In order to evaluate the hydrocarbon generation potential of Lucaogou Formation source rocks in Junggar Basin,this paper,based on geological profile analysis and previous research results,studies the organic geochemical characteristics of organic-rich shale in Lucaogou Formation in the southern margin of Junggar Basin.The organic types,organic carbon content and organic maturity of the upper,middle and lower members of Lucaogou Formation are compared and analyzed according to profile 1-profile 3 respectively,and the unconventional oil and gas potential of Lucaogou Formation is pointed out.The results show that:(1)The organic matter abundance of Lucaogou Formation source rocks in the study area is large,with TOC content ranging from 0.31%to 22.21%,with an average value of 5.16%.On the plane,the average TOC content of Lucaogou Formation gradually increases from west to east in the study area,with the highest TOC in the vertical middle section,the second in the upper section and the lowest in the lower section.(2)Through the study of the relationship between the maximum pyrolysis peak temperature(Tmax)and the hydrogen index(IH),the Lucaogou Formation in the study area has developed kerogen types I,Ⅱ1,Ⅱ2 andⅢ,with type I andⅡ1 kerogen being the predominant type,followed by typeⅡ2 andⅢ.(3)Lucaogou Formation in the study area is in the stage of thermal maturation,with Ro peak value of 0.9%,Tmax interval of 429.0℃~440.0℃,which may produce good shale oil.There is no obvious change on the plane,and Ro value tends to increase gradually from shallow to deep in the vertical direction.(4)The results show that the sedimentary organic matter of Lucaogou Formation has entered the threshold of oil generation and has good potential for oil and gas exploration.
作者
朱彦群
Zhu Yanqun(Pudong Oil Production Plant of Zhong-yuan Oilfield Company,Puyang,He'nan,457001,China)
出处
《新疆地质》
CAS
CSCD
北大核心
2020年第1期77-81,共5页
Xinjiang Geology
