石油与天然气地质 ›› 2013, Vol. 34 ›› Issue (5): 610-618.doi: 10.11743/ogg20130505

• 油气地质 • 上一篇    下一篇

鄂尔多斯盆地古隆起东侧奥陶系马家沟组中组合成藏地质条件

时保宏1, 刘亚楠1, 武春英2, 黄正良2, 任军峰2   

  1. 1. 西安石油大学 地球科学与工程学院, 陕西 西安 710065;
    2. 中国石油 长庆油田分公司 勘探开发研究院, 陕西 西安 710018
  • 收稿日期:2013-03-24 修回日期:2013-08-15 出版日期:2013-10-08 发布日期:2013-10-08
  • 作者简介:时保宏(1971—),男,博士、副教授,油气成藏地质学及天然气地球化学。E-mail:bh.sh@163.com。
  • 基金资助:

    陕西省教育厅项目(11JK0735)。

Geological conditions for hydrocarbon accumulation in middle reservoir-source rock combination of the Ordovician Majiagou Formation on the east side of the paleo-uplift in Ordos Basin

Shi Baohong1, Liu Yanan1, Wu Chunying2, Huang Zhengliang2, Ren Junfeng2   

  1. 1. School of Earth Science and Engineering, Xi'an, Shiyou University, Xi'an Shaanxi 710065, China;
    2. Exploration and Development Research Institute of PetroChina, Changqing Oilfield Company, Xi'an, Shaanxi 710018, China
  • Received:2013-03-24 Revised:2013-08-15 Online:2013-10-08 Published:2013-10-08

摘要:

鄂尔多斯盆地古隆起东侧奥陶系马家沟组中组合发育白云岩储层,其特征明显有别于靖边气田奥陶系顶部风化壳储层。通过储层岩性分析、流体包裹体测试分析,结合钻井、地球化学、试油等相关资料,从烃源、储层、沉积等方面对鄂尔多斯盆地古隆起东侧马家沟组中组合成藏地质条件进行了系统分析。结果表明,古隆起东侧马家沟组中组合马55 、马57和马59亚期处于次一级海侵沉积背景,水动力条件强,滩相沉积发育,在隆起周边形成自形程度高的粗粉晶-细晶结构的晶粒状白云岩储层,具有晶粒均一、连通性好且发育白云石晶间孔等特征;受加里东末期构造抬升运动影响,古隆起东侧奥陶系顶部剥露为中组合地层,与上覆上古生界煤系烃源岩直接接触,形成了良好的源、储配置关系;受上倾方向岩相变化控制,在空间上中组合滩相白云岩逐渐相变为泥晶灰岩,形成分布不连续、局部富集的岩性圈闭。

关键词: 成藏条件, 中组合, 马家沟组, 奥陶系, 古隆起, 鄂尔多斯盆地

Abstract:

The dolomite reservoirs in middle reservoir-source rock combination of the Ordovician Majiagou Formation on the east side of paleo-uplift in Ordos Basin are obviously different from the weathering crust reservoirs at the top of the Ordovician in Jinbian gas field.A systematic study had been carried out on the geological conditions for hydrocarbon accumulation in these dolomite reservoirs in respect of source rocks,reservoirs,sedimentation based on results of reservoir lithology characterization and fluid inclusion testing as well as analysis of drilling data,geochemical and testing data.The results show that the middle reservoir-source rock combination of the Formation experienced strong hydrodynamics against a brief regression sedimentary settings.Beach facies were well developed and formed dolomite reservoirs.The dolomite features in highly automorphic coarse powder and fine-crystal texture,uniform grains,excellent connectivity and well-developed intercrystal pores.Affected by tectonic uplifting during the late Caledonian,the top Ordovician at eastern side of the paleo-uplift were denuded and came into contact with coal-measure source rocks,providing favorable source-reservoir combination.Controlled by lithofacies transformation at updip direction,the dolomites of beach facies in the middle reservoir-source rock combination of the Formation change gradually into micrite,forming discontinuous lithological traps.

Key words: reservoiring condition, middle reservoir-source rock combination, Majiagou Formation, Ordovician, paleo-uplift, Ordos Basin

中图分类号: