塔里木盆地库车坳陷吐格尔明及周缘地区三叠系—侏罗系烃源岩地球化学特征、分布规律与油气地质意义

吐格尔明及周缘地区发育多套烃源岩，但主力烃源岩层位与生烃潜力不明确，制约了油气勘探。通过对吐格尔明及周缘地区钻井、地震资料和油气与烃源岩地球化学数据综合分析认为，研究区三叠系—侏罗系自下而上发育4套烃源岩：其中三叠系塔里奇克组（T₃t）煤系泥岩厚度薄且分布局限，有机质丰度中等，有机质类型以Ⅲ型为主，处于成熟—高成熟阶段；侏罗系阳霞组一段（J₁y¹）湖相泥岩厚度薄、分布稳定，有机质丰度高，有机质类型以Ⅱ₁型为主；阳霞组二—四段（J₁y^2-4）与克孜勒努尔组（J₂kz）2套煤系泥岩厚度大、分布稳定，有机质丰度较高，有机质类型以Ⅱ₂—Ⅲ型为主；侏罗系烃源岩整体处于低熟—成熟阶段。通过烃源岩与油气生物标志物特征分析可知：吐格尔明地区油气主要来自侏罗系烃源岩，该地区南北两翼深部烃源岩生成的油气通过逆冲断裂与三叠系、侏罗系顶面不整合面侧向运移，再经断裂垂向充注阳霞组和克孜勒努尔组，形成2套富油气层，指出克孜勒努尔组和阳霞组为该区下一步油气勘探主力目的层。

Geochemical characteristics,distribution and petroleum geological significance of Triassic-Jurassic source rocks in the Tugeerming and surrounding areas of Kuqa Depression,Tarim Basin

Many sets of source rocks are developed in the Tugeerming and surrounding areas, but the main source rocks and hydrocarbon generation potential are not clear, which restricts oil and gas exploration. Based on the comprehensive analysis of drilling, seismic, oil and gas and geochemical data of source rocks in the Tugeerming and surrounding areas, it is believed that there are four sets of source rocks in the Triassic-Jurassic strata from bottom to top in the Tugeerming and surrounding area: the mudstone of the Triassic Taliqike Formation (T₃t) coal measures have thin thickness, limited distribution, medium organic matter abundance. The organic matter type is mainly type III, which is in the mature-high mature stage. The lacustrine mudstone of the first member of Yangxia Formation (J₁y₁ ) in Jurassic have thin thickness, stable distribution and high organic matter abundance. The organic matter is mainly type II₁. The mudstone source rocks in the second to fourth members of the Yangxia Formation (J₁y_2-4) and the Kezilenuer Formation (J₂kz) have large thickness, stable distribution, high organic matter abundance. The organic matter is mainly types II₂-III. Jurassic source rocks are mainly in the low mature-mature stage. Through the hydrocarbon biomarkers and carbon isotope analysis of source rocks, it can be seen that the oil and gas in Tugeerming area mainly come from the Jurassic source rocks. The oil and gas generated by the deep source rocks in the north and south wing of the pitching of Tugeerming area, migrated through the thrust fault and the unconformity surface on the top of the Triassic and Jurassic. The oil and gas are vertically filled in the Yangxia Formation and the Kezilenuer Formation through the fault, forming two sets of rich oil and gas reservoirs. It is pointed out that the Kezilenuer Formation and the Yangxia Formation are the main target layers for oil and gas exploration in this area.