石油学报 ›› 2012, Vol. 33 ›› Issue (5): 807-813.DOI: 10.7623/syxb201205009

• 地质勘探 • 上一篇    下一篇

珠三坳陷珠三南断裂形成演化及其对沉积中心迁移的控制

雷宝华 1,2 郑求根 3 李俊良 4 李 琦 3 刘 豪 3 王海荣 3   

  1. 1 国土资源部海洋油气资源与环境地质重点实验室 山东青岛 266071; 2 青岛海洋地质研究所 山东青岛 266071; 3 中国地质大学 北京 100083; 4 中海石油有限公司湛江分公司 广东湛江 524057
  • 收稿日期:2011-12-13 修回日期:2012-06-26 出版日期:2012-09-25 发布日期:2012-11-27
  • 通讯作者: 雷宝华
  • 作者简介:雷宝华,男,1984年9月生,2010年获中国地质大学(北京)矿产普查与勘探专业硕士学位,现为青岛海洋地质研究所实习研究员,主要从事石油构造分析和天然气水合物成藏方面研究工作。
  • 基金资助:

    国家重大科技专项(2009ZX05009-002)和国土资源部海洋油气资源与环境地质重点实验室基金(MRE201114 和 MRE201121)资助。

Formation and evolution of Zhu-3 south fault and its control on the depocenter shift in Zhu-3 depression,Pearl River Mouth Basin

LEI Baohua 1,2 ZHENG Qiugen 3 LI Junliang 4 LI Qi 3 LIU Hao 3 WANG Hairong 3   

  • Received:2011-12-13 Revised:2012-06-26 Online:2012-09-25 Published:2012-11-27

摘要:

应用断裂三维定量构造几何学和不同时期断裂活动多参数走向长度关系分析方法,对珠三南断裂几何特征、形成演化、分段和连锁、活动强度的差异及其对沉积中心迁移的控制,进行较细致和定量的研究。珠三南断裂总体分3大段:东段、西段北支和西段南支,依次细分为2小段、4小段和3小段,各段几何特征和活动差异较大。早期,断裂自西向东分段延伸发育;中期,西段南支活动停止、西段北支和东段强烈差异活动下连锁;晚期,断裂自西向东分段停止活动。整个断裂体系随断裂“弱→强→弱”活动特征,呈“分→合→分”的演化状态。沉积中心随断裂活动强度差异变化表现为“跷跷板式”的迁移规律:古新世在文昌C凹陷的西部→始新世—渐新世早、中期在文昌A凹陷→渐新世晚期在文昌B凹陷的西部→渐新世以后不受断裂控制。

关键词: 珠三坳陷, 珠三南断裂, 多参数-走向长度分析法, 几何学, 形成演化, 分段连锁, 沉积中心迁移

Abstract:

Geometric features, formation and evolution, division and linkage, and active intensity differential of Zhu-3 south fault and its control on the depocenter shift in Zhu-3 depression were investigated in detail and quantitatively by applying the 3-D quantitative structure geometry of faults and analysis of multi-parameters and strike length of fault activity at different stages. The fault has three major segments:the eastern one, western north one and western south one, each can be further divided into 2, 4 and 3 sub-pieces, respectively. Geometric features and activities of each segment were quite different at various stages. For instance, at the early stage, the fault extended by pieces from west to east; at the middle stage, the western north one and eastern one linked under a strongly differential movement while the western south one stopped; and at the late stage, the fault stopped from west to east by pieces. The entire fault system characteristic of “weak → strong → weak” activities experienced a “division → linkage → division” evolutionary episode correspondingly. The depocenter showed a “teeterboard”-type shift rule with variances in active intensity of the fault, i.e. from the western Wenchang-C sag in Paleocene to Wenchang-A sag in Eocene and early-middle Oligocene, then to the western Wenchang-B sag in late Oligocene, and with no fault control after Oligocene.

Key words: Zhu-3 depression, Zhu-3 south fault, analysis of multi-parameters and strike length, geometry, formation and evolution, division and linkage, depocenter shift