石油与天然气地质 ›› 1993, Vol. 14 ›› Issue (3): 191-199.doi: 10.11743/ogg19930303

• 论文 • 上一篇    下一篇

鄂尔多斯盆地中部气田奥陶系产层的油气源

关德师1, 张文正2, 裴戈2   

  1. 1. 石油天然气总公司石油勘探开发科学研究院 北京100083;
    2. 长庆石油勘探局勘探开发研究院 甘肃 庆阳745101
  • 收稿日期:1992-06-23 修回日期:1992-08-29 出版日期:1993-09-25 发布日期:2012-01-16
  • 基金项目:

    国家自然科学基金

OIL-GAS SOURCES OF ORDOVICIAN RESERVOIR IN GAS FIELD OF CENTRAL ORDOS BASIN

Guan Deshi1, Zhang Wenzheng2, Pei Ge2   

  1. 1. Research Institute of Petroleum Exploration and Development, CNPC, Beijing;
    2. Research Institute of Petroleum Exploration and Development, Changqing Petroleum Auministration, Qingyang, Gansu
  • Received:1992-06-23 Revised:1992-08-29 Online:1993-09-25 Published:2012-01-16

PDF (PC)

475

被引次数

105

摘要：

利用天然气组分,碳同位素以及凝析油(原油)的在线碳同位素分析资料,结合区域地质条件、产层纵向分布特征,通过分析对比,确认鄂尔多斯盆地中部气田的天然气主要为上古生界煤系源岩的产物,可能有少量的下古生界源岩裂解气的混入。

关键词: 鄂尔多斯盆地, 天然气田, 奥陶系, 油气源, 煤成气

Abstract:

The gas fields in Central Ordos Basin are in an unified and broad block.The gas in the fields is mainly from Upper Paleozoic coal measures.The principal evidences for this are:the δ13C values of the gas from Ordovician reservoirs are basically the same in wide areas and are well-matched or only have about 2‰ deviation with that of the gas from the Upper Paleozoic;the δ13C values of the gas-condensate light hydrocarbon monomeric molecule are consistent with that of condensate from Permo-Carboniferous;the δ13C val-ues are generally heavier than -25‰ and relatively enriched in heavier carbon isotope 13C;the carbon isotopes of the n-alkane,pristane and phytane all suggest that they are the products of high-matured coal measure source rocks and have a close parental rela-tionship with Upper Paleozoic coal measures.Besides,the compact rocks of O1m54 -O1m56 are overlained by gas productive rocks,whereas the compact rocks of O1m56 -O1m57 gas reservoir are poorly gas-bearing;bitumen are rarely present in the Lower Paleozoic rocks.