石油学报 ›› 2011, Vol. 32 ›› Issue (6): 928-936.DOI: 10.7623/syxb201106002

• 地质勘探 • 上一篇    下一篇

冀中坳陷新近系油气成藏机理与成藏模式

刘  华  蒋有录  徐昊清  张永丰   

  1. 中国石油大学地球科学与技术学院  山东青岛  266555
  • 收稿日期:2011-03-17 修回日期:2011-06-27 出版日期:2011-11-25 发布日期:2012-01-17
  • 通讯作者: 刘 华
  • 作者简介:刘 华,女,1977年5月生,2006年获中国石油大学矿产普查与勘探专业博士学位,现为中国石油大学副教授,主要从事油气藏形成与分布教学与研究。
  • 基金资助:

    国家自然科学基金项目(No.40972094/D0207)、山东省自然科学基金(ZR2011DL009)和中国石油大学(华东)自主创新项目联合资助。

Accumulation mechanisms and modes of Neogene hydrocarbons in Jizhong Depression

LIU Hua  JIANG Youlu  XU Haoqing  ZHANG Yongfeng   

  • Received:2011-03-17 Revised:2011-06-27 Online:2011-11-25 Published:2012-01-17

摘要:

通过对渤海湾盆地冀中坳陷新近系油气分布规律、油气来源以及断裂活动性与封闭性的研究,建立了冀中坳陷新近系两类油气运聚模式:斜坡带远源—侧向运移模式和断阶带近源—垂向运移模式。断阶带近源—垂向运移模式以饶阳凹陷东部断阶带最为典型,该区新近系油气藏紧邻供烃洼陷,油气分布在活动性强的油源断裂附近,主成藏期断裂活动的强弱与时间长短决定了新近系油气的富集程度及富集层系。斜坡带远源—侧向运移模式是霸县凹陷文安斜坡新近系油气藏形成的主要模式,该区新近系油气藏远离供烃洼陷,由于晚期构造活动弱,断层垂向运移能力差,新近系油气主要借助于断层和砂体的配置进行阶梯式运移,其中断层的侧向封闭性决定了油气的运移方式及成藏方向。

关键词: 断裂, 成藏机理, 成藏模式, 新近系油气藏, 冀中坳陷

Abstract:

Based on the study of distributional rules and sources of Neogene hydrocarbons, characters of fault activities and fault sealing properties, we recognized two kinds of migration and accumulation modes for Neogene hydrocarbons in Jizhong Depression, Bohai Bay Basin, namely a far-source stepped lateral migration pattern in slope zones and a near-source vertical migration pattern in fault terrace belts. The vertical migration pattern in fault terrace belts occurs typically in eastern step-fault zones in Raoyang Sag, where Neogene reservoirs are distributed adjacent to kitchen subsags and nearby strongly active faults of source rocks, and the accumulation degree and layer system of Neogene hydrocarbons are determined by the intensity and duration of fault activities during the main hydrocarbon accumulation period. While the far-source stepped lateral migration pattern dominates the Neogene hydrocarbon occurrence in the Wen’an slope belt, Baxian Sag, where Neogene reservoirs are far from kitchen subsags, the vertical migration of hydrocarbons is not strong due to a weak tectonic movement of the late stage, and the migration pattern and accumulation direction of Neogene hydrocarbons are determined by the lateral sealing ability of faults.

Key words: fault, accumulation mechanism, accumulation model, Neogene reservoir, Jizhong Depression