摘要
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(T_(3)t)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(J_(1)y^(1))湖相泥岩厚度薄、分布稳定,有机质丰度高,有机质类型以Ⅱ_(1)型为主;阳霞组二—四段(J_(1)y^(2-4))与克孜勒努尔组(J_(2)kz)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Ⅱ_(2)—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。
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 Tug‐eerming and surrounding areas,it is believed that there are four sets of source rocks in the Triassic-Jurassic stra‐ta from bottom to top in the Tugeerming and surrounding area:the mudstone of the Triassic Taliqike Formation(T_(3)t)coal measures have thin thickness,limited distribution,medium organic matter abundance.The organic matter type is mainly typeⅢ,which is in the mature-high mature stage.The lacustrine mudstone of the first member of Yangxia Formation(J_(1)y_(1))in Jurassic have thin thickness,stable distribution and high organic matter abundance.The organic matter is mainly typeⅡ_(1).The mudstone source rocks in the second to fourth members of the Yangxia Formation(J_(1)y_(2-4))and the Kezilenuer Formation(J_(2)kz)have large thickness,stable distribution,high organic matter abundance.The organic matter is mainly typesⅡ_(2)-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.
作者
凡闪
卢玉红
李玲
魏华
张慧芳
申林
FAN Shan;LU Yuhong;LI Ling;WEI Hua;ZHANG Huifang;SHEN Lin(PetroChina Tarim Oilfield Company,Korla 841000,China)
出处
《天然气地球科学》
CAS
CSCD
北大核心
2022年第12期2074-2086,共13页
Natural Gas Geoscience
基金
国家重点研发计划项目“塔里木盆地盐下超深层大型油气田形成机理与分布预测”(编号:2019YFC0605505)资助
关键词
吐格尔明及周缘地区
烃源岩评价
有机地球化学
油气源对比
勘探潜力
Tugeerming and surrounding area
Source rock evaluation
Organic geochemistry
Oil-gas source correlation
Exploration potential
作者简介
凡闪(1987-),女,安徽亳州人,三级工程师,硕士,主要从事成藏地球化学研究.E-mail:fansan-tlm@petrochina.com.cn.
