石油学报 ›› 2010, Vol. 31 ›› Issue (5): 744-747.DOI: 10.7623/syxb201005007

• 地质勘探 • 上一篇    下一篇

济阳坳陷不整合结构不能作为油气长距离运移的通道

宋国奇 1,2  隋风贵 1  赵乐强 1   

  1. 1 中国石化胜利油田分公司  山东东营  257015; 2 中国石油大学地球资源与信息学院  山东东营  257061
  • 收稿日期:2010-01-09 修回日期:2010-03-09 出版日期:2010-09-25 发布日期:2010-11-30
  • 通讯作者: 宋国奇
  • 作者简介:宋国奇,男,1957年9月生,2003年获中国科学院博士学位,现为中国石化胜利油田分公司油气勘探首席高级专家,教授级高级工程师,长期从事油气勘探与地质综合研究。
  • 基金资助:

    中国石化重大科技攻关项目(P06012)“济阳坳陷第三系不整合油气藏形成与分布规律”部分成果。

No unconformity structure in Jiyang Depression as long distance migration pathway of hydrocarbon

SONG Guoqi 1,2  SUI Fenggui 1  ZHAO Leqiang 1   

  • Received:2010-01-09 Revised:2010-03-09 Online:2010-09-25 Published:2010-11-30

摘要:

不整合能否作为油气长距离运移的通道取决于不整合面顶板岩石的渗透性、平面连续性以及不整合面之下半风化淋滤带的岩性组合。针对陆相盆地沉积相带的多变性以及泥岩风化后物性基本不变的客观存在,并结合对济阳坳陷不整合基本结构及其油气输导能力的分析,认为陆相断陷盆地不整合结构层主要由空间上交互频繁的砂、泥岩组成,不整合渗透层及其顶部非渗透层在横向上连续性差,虽可产生油气横向、垂向两种输导方式,但输导范围局限,很难作为油气长距离运移的通道。此观点有助于改变不整合油气输导作用的传统认识,对于深化陆相断陷盆地油气成藏认识具有重要意义。

关键词: 不整合, 运移通道, 输导能力, 输导方式, 陆相断陷盆地

Abstract:

Whether an unconformity could serve as a long-distance migration pathway for hydrocarbons relies on the permeability and lateral continuity of roof rocks of the unconformity and on lithologic associations of semi-weathering and leaching zones beneath the unconformity.As sedimentary facies vary greatly in continental basins but petrophysical properties of weathered mudstones remain nearly unchangeable,the present paper analyzed basic unconformity structures in Jiyang Depression and their transfer capacity for hydrocarbons.The result showed that unconformity formations in continental faulted basins consisted mainly of frequently alternating interbeds of sand and mud,and the horizontal continuity either for permeable layers of the unconformity or of for its top non-permeable layers was poor.Although both horizontal and vertical migrations of hydrocarbons might occur,it was difficult for the unconformity to act as a pathway for long distance hydrocarbon migration due to its limited transfer extension.This conclusion may be helpful for renovation of the traditional thought on the transfer ability of unconformity and of significance to deepen the current understanding on reservoir formation.

Key words: unconformity, migration pathway, transfer capacity, transfer type, continental faulted basin