摘要
临清坳陷东部石炭-二叠系煤系烃源岩极为发育,厚度大、分布广,对其进行生烃条件研究,对于深层的煤成气勘探具有重要意义。在烃源岩沉积特征研究的基础上,利用多种化验测试资料对烃源岩的有机地球化学特征进行了分析。研究发现,临清坳陷东部构造隆起带煤系烃源岩有机质较高,但氯仿沥青“A”含量和氯仿沥青“A”转化率偏低,埋藏较深的凹陷地区可能生烃潜力较大,尚需做深入的研究;生烃母质以产气态烃的III2型干酪根为主,其次为Ⅲ1型;康庄潜山等构造隆起区有机质成熟度较低,尚处于成熟阶段的初期,凹陷中煤系烃源岩埋深大,热演化程度较高,推测可能已经达到成熟-过成熟阶段。最后通过烃源岩热演化史的研究,确定本区煤系烃源岩的主要有两个生气期,其中第三纪-第四纪为本区的主要生气聚集期,受不同地区沉积埋藏演化差异的控制,以腰站断层为界,南区的主生气期为沙四-沙二期,北区为沙二-馆陶期。
Coal-measure source rock in Carboniferous-Persian has heavy thickness and extensive distribution in the eastern part of LinQing depression,which is very important for deep coal-formed gas explored to develop the research of hydrocarbon generation potential.Based on the characteristic of the deposit from source rock,experiments data from the analysis of source rock organic geochemical characteristic are obtained.The research shows that coal-measure source rock has high organic matter and low choloroform bitumen A from the constructure uplift belt in the eastern part of the Linqing depression,Source rock has great hydrocarbon generation potential in the buried deeper depression,hydrocarbon source matter mainly produces high Ⅲ_2 Kerogen gaseous hydrocarbon,the next one is Ⅲ_1 Kerogen.Some organic matter mature level is very low in the structure uplift area of Kangzhuang buried hill,which still stay the earlier mature,coal-measure source rock buried deep and thermal evolution high in the depression,we presume that they enter the mature-over or mature stages.By studying the historical thermal evolution of the source rock,we can make sure that coal-measure source rock has two hydrocarbon generation stages,endured the controlling of the buried evolution difference in the Quaternary and Neogene,one main gas generation is Es3-Es4 stages in the south district,and another is Es2-Ek stages in the north district.
出处
《新疆石油天然气》
CAS
2006年第3期16-21,35,共7页
Xinjiang Oil & Gas
关键词
石炭-二叠系
煤系烃源岩
地球化学特征
煤成气
临清坳陷东部
Carboniferous-Persian Period
Coal-Measure Source Rock
Geochemical Characteristic
Coal-Formed Gas
The Eastern Part Of The LinQing Depression
