石油学报 ›› 2014, Vol. 35 ›› Issue (2): 294-302,384.DOI: 10.7623/syxb201402009

• 地质勘探 • 上一篇    下一篇

构造活动强度划分断陷盆地构造区划——以饶阳凹陷为例

邹娟, 戴俊生, 张丹丹, 伍亚, 张艺, 田博   

  1. 中国石油大学地球科学与技术学院 山东青岛 266580
  • 收稿日期:2013-07-31 修回日期:2013-10-15 出版日期:2014-03-25 发布日期:2014-04-11
  • 通讯作者: 邹娟,女,1987年2月生,2010年毕业于中国石油大学(华东),现为中国石油大学(华东)地球科学与技术学院博士研究生,主要从事油气区构造解析、构造应力场研究。Email:zoujuan2012@yeah.net
  • 作者简介:邹娟,女,1987年2月生,2010年毕业于中国石油大学(华东),现为中国石油大学(华东)地球科学与技术学院博士研究生,主要从事油气区构造解析、构造应力场研究。Email:zoujuan2012@yeah.net
  • 基金资助:

    国家重大科技专项(2011ZX05011-001)和中国石油华北油田公司科技项目(HBYT-WTY-2011-JS-303)资助。

Structural divisions of rift basin based on the intensity of tectonic activity:a case study from the Raoyang sag

Zou Juan, Dai Junsheng, Zhang Dandan, Wu Ya, Zhang Yi, Tian Bo   

  1. School of Geosciences, China University of Petroleum, Qingdao 266580, China
  • Received:2013-07-31 Revised:2013-10-15 Online:2014-03-25 Published:2014-04-11

摘要:

为了直观、准确、定量地描述断陷盆地各个时期的构造活动强度,选取了底面曲率、地层厚度变化率导数、断层密度、断层落差面密度和不整合面剥蚀率5个表征参数,并将其对构造活动强度的显示结果叠加,从而提出了以构造活动强度为依据的构造区划。以饶阳凹陷为例,确定了构造活动强度定量划分标准:将饶阳凹陷整体划分为5个强构造活动区、3个中构造活动区和3个弱构造活动区,发现斜坡基本为弱构造活动区,背斜构造带为强构造活动区,断裂构造带为强构造活动区或中构造活动区,洼槽多为弱构造活动区;通过对各个时期进行构造活动强度区划,总结出弱—中—弱、弱—强—弱、中—弱、强—中—弱、强—弱及持续弱6种演化模式,同时结合研究区实例发现,先变强后变弱构造区发育古近系油气藏,变弱构造区发育潜山油气藏、古近系油气藏,持续弱构造区油气藏较为少见。

关键词: 构造活动强度, 表征参数, 量化标准, 强度分区, 演化模式, 饶阳凹陷

Abstract:

This study is focused on the structural division of rift basin based on the intensity of tectonic activity. Intuitive, accurate, and quantitative description of the intensity of tectonic activity at different stages are achieved by superimposing indications of five characterization parameters, including bottom curvature, derivative of stratigraphic thickness changing rate, fault density, throw density, and erosion rate of the unconformity. The criteria for quantitative division of the intensity of tectonic activity are applied in the Raoyang sag, Jizhong depression. The Raoyang sag is divided into eleven tectonically active regions, with five intensive tectonic activity regions, three moderate tectonic activity regions, and three weak tectonic activity regions. Slopes are generally as weak tectonic activity region; anticline zones are intensive tectonic activity region; fault zones are intensive or moderate tectonic activity region; and sub-sags mainly are weak tectonic activity region. Six evolutionary models are summarized based on division of the intensity of tectonic activity in different stages, i.e., weak-moderate-weak, weak-intensive-weak, medium-weak, intensive-moderate-weak, intensive-weak, and continuously weak. Taking into account the field data, it is concluded that Paleogene oil and gas reservoirs are developed in tectonic zones with weak-intensive/moderate-weak tectonic activity, whereas buried-hill and Paleogene reservoirs are developed in tectonic zones with weakening tectonic activity; oil and gas reservoirs are rarely developed in tectonic zones with continuously weak tectonic activity in Raoyang sag.

Key words: intensity of tectonic activity, characterization parameters, quantitative criteria, partition of strength, evolutionary model, Raoyang sag

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