石油实验地质2016，Vol.38Issue(3)：382-388,394,8.DOI:10.11781/sysydz201603382
伦坡拉盆地始新统牛堡组烃源岩成熟史
Maturity history of source rocks in the Eocene Niubao Formation, Lunpola Basin
摘要
Abstract
Three sets of source rocks developed upwards in the Eocene Niubao Formation in the Lunpola Basin, i.e., the middle part of the second member of Niubao Formation (E2n22), the upper part of the second member of Niubao Formation (E2n32), and the lower part of the third member of Niubao Formation (E2n13). Based on drilling, seismic and hydrocarbon fluid inclusion analyses, the thermal evolution history of the basin and the maturity history of source rocks in the Niubao Formation were systematically analyzed with basin simulation technology. From the E2 n3 to the third member of the Oligocene Dingqinghu Formation, the paleogeothermal gradient in the Lunpola Basin consistently decreases from 66.7 to 40 °C/km, showing the characteristics of a typical heating basin. The growth of paleogeothermal gradient is clearly related to regional tectonic uplifting. The source rocks in the E2 n22 and E2 n32 became mature early and have a higher maturity. They entered oil generation thresholds during the middle-late Eocene (46.4-37.5 Ma) and early Oligocene (36.6-33.5 Ma), respectively. At present, they are mature and generating oil (Ro =0.7%-1.3%), and serve as the main source rock in the study area. At present, the thermal evolution extent of E2 n22 and E2n32 hydrocarbon source rocks in the Jiangriacuo Sag in the west is the highest,and its hydrocarbon forming and supplying ability is superior to the Jiangjiangcuo and Pacuo sags in the center and east.关键词
热史/成熟史/烃源岩/牛堡组/始新统/伦坡拉盆地Key words
thermal history/maturity history/source rock/Nibao Formation/Eocene/Lunpola Basin分类
能源科技引用本文复制引用
潘磊,曹强,刘一茗,李一腾,汪岩,李智泉..伦坡拉盆地始新统牛堡组烃源岩成熟史[J].石油实验地质,2016,38(3):382-388,394,8.基金项目
中国石化重大勘探导向项目"西藏中石化探区油气勘探潜力评价与勘探部署建议"和中国石化勘探分公司横向协作项目(G0800-14-KK-169)资助. （G0800-14-KK-169）
