新疆石油地质 ›› 1998, Vol. 19 ›› Issue (6): 476-479.

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二连裂谷系下白垩统烃源岩有机质热演化特征

方杰, 侯凤香, 孙彤彤, 刘敬强, 刘井旺, 潘春年   

  1. 华北石油勘探开发研究院 河北任丘 062552
  • 收稿日期:1998-02-12 发布日期:2020-09-19
  • 作者简介:方杰:高级工程师 石油地质

THERMAL EVOLUTION CHARACTERISTIC OF ORGANICMATTER OF LOWER CRETACEOUS SOURCE ROCK IN ERLIAN RIFT SYSTEM

Fang Jie, Hou Fengxiang, Sun Tongtong, Liu Jingqiang, Liu Jingwang, Pan Chunnian   

  1. Research Institute of Exploration and Development, North China Petroleum Exploration Bureau, Renqiu, Hebei 062552
  • Received:1998-02-12 Published:2020-09-19
  • About author:Fang Jie, Senior Engineer, Petroleum Geology

摘要: 二连裂谷系由50 多个断陷组成。主要的烃源层是下白垩统巴彦花群。在相同的区域构造作用下,断陷群既有相似的构造发展史, 又有独立的沉积单元和明显的外在可分性。裂谷期后的区域抬升作用导致烃源岩的成熟度偏低, 并且各断陷之间有机质的热演化程度相差悬殊。通过区域地温场的对比和大量的有机地化资料分析研究, 明确了各断陷有机质热演化特征, 建立了断陷群烃源岩有机质的热演化生烃模式, 总结归纳出二连裂谷系三种类型断陷烃源岩的成油带长度及生油气潜力, 指出Ⅰ类断陷为含油断陷, 是二连裂谷断陷群中最有勘探前景的断陷。

关键词: 二连盆地, 裂谷带, 早白垩世, 烃类演化, 有机质, 油气生成

Abstract: Erlian rift system consists of more than50fault-depressions, major source layer is in Bayanhua group of Lower Cretaceous.Subjected to same regional tectonic event, fault-depression group has similar structure evolution history, also independent sedimentary unit distinguished from each other.Post-rifting regional uplift resulted in low maturity of source rock, wide difference from each other.Comparison of regional geothermal fields, analysis of organic geochemistry exhibi ted thermal evolution characteristics of organic matter in each fault-depression, established hydrocarbon-generation model, summarized the extent of oil formation zone, hydrocarbon-generation potential of source rock in three different fault-depression of Erlian rift system.Furthermore, it is pointed out that Ⅰ -type fault-depression enriched in oil is the most favourable target for oil/gas exploration.

Key words: Erlian basin, Rift belt, Early Cretaceous, Hydrocarbon evolution, Organic matter, Oil and gas origin