石油学报 ›› 2015, Vol. 36 ›› Issue (9): 1098-1107.DOI: 10.7623/syxb201509007

• 地质勘探 • 上一篇    下一篇

蓬莱9-1构造新生代构造演化:磷灰石裂变径迹证据

白冰, 王清斌, 赵国祥, 刘晓健   

  1. 中海石油(中国)有限公司天津分公司渤海石油研究院, 天津 300452
  • 收稿日期:2015-03-05 修回日期:2015-07-22 出版日期:2015-09-25 发布日期:2015-09-30
  • 通讯作者: 白冰,男,1986年12月生,2010年获吉林大学地球科学学院学士学位,2013年获吉林大学地球科学学院硕士学位,现为中海石油(中国)有限公司天津分公司渤海石油研究院工程师,主要从事油气勘探及储层研究。Email:baibing3@cnooc.com.cn
  • 作者简介:白冰,男,1986年12月生,2010年获吉林大学地球科学学院学士学位,2013年获吉林大学地球科学学院硕士学位,现为中海石油(中国)有限公司天津分公司渤海石油研究院工程师,主要从事油气勘探及储层研究。Email:baibing3@cnooc.com.cn
  • 基金资助:

    国家重大科技专项(2011ZX05023-006)资助。

Cenozoic tectonic evolution of PL9-1 structure: an evidence of apatite fission track

Bai bing, Wang Qingbin, Zhao Guoxiang, Liu Xiaojian   

  1. Research Institute of Bohai Oil Field, CNOOC Tianjin Branch Company, Tianjin 300452, China
  • Received:2015-03-05 Revised:2015-07-22 Online:2015-09-25 Published:2015-09-30

摘要:

作为国内最大的中生界花岗岩潜山油田,蓬莱9-1构造中生界花岗岩的构造演化直接制约着储层的分布及好坏,而区域构造演化证实花岗岩在整个新生代经历了长期的暴露和改造过程。通过磷灰石裂变径迹技术对该构造中生界花岗岩新生代的构造演化进行了详细研究,结果表明该构造新生代热史分为4个降温期和2个升温期共6个阶段,结合区域构造背景可将新生代构造演化进一步划分为稳定期(65~51 Ma)、低速隆升期(51~34 Ma)、高速隆升期(34~18 Ma)、沉降期(18~5 Ma)和成藏期(5 Ma至今)5个阶段。不同隆升期花岗岩剥蚀速率存在明显差异,其高速隆升期剥蚀速率可达110.7 m/Ma,新生代平均剥蚀量约2 260 m。成藏研究证实构造演化与花岗岩成储成藏有着密切联系,隆升期的风化壳形成和沉降期的泥岩沉积使花岗岩具备了良好的储盖组合,成藏期的新构造运动又为油气的运移和充注提供了有利条件。

关键词: 磷灰石裂变径迹, 构造演化, 剥蚀量恢复, 新生代, 蓬莱9-1构造

Abstract:

PL9-1 structure is the largest Mesozoic granite buried-hill oil field in China, where the distribution and quality of reservoirs are directly restricted by tectonic evolution of Mesozoic granites. Regional tectonic evolution has proved that the granites had undergone a long period of exposure and transformation during the whole Cenozoic era. With the use of apatite fission track technology, a detailed research was conducted on the Cenozoic tectonic evolution of Mesozoic granites in PL9-1 structure. The results show that Cenozoic thermal history of PL9-1 structure can be divided into 6 stages, including 4 cooling stages and 2 heating stages. In combination with regional tectonic settings, the Cenozoic tectonic evolution can be further divided into 5 stages, i.e., stable stage (65-51 Ma), low-rate uplift stage (51-34 Ma), high-rate uplift stage (34-18 Ma), sedimentary stage (18-5 Ma) and accumulation stage (5 Ma-present). Denudation rates are significantly different during various uplift stages. The denudation rate can reach 110.7 m/Ma in the high-rate uplift stage, and the average Cenozoic denudation thickness is about 2 260 m. Verified by relevant researches, there is a close relationship between tectonic evolution and granite reservoir accumulation. Granites have a favorable reservoir-cap assemblage due to the formation of weathering crust in the uplift stage and mudstone sedimentation in the sedimentary stage. Meanwhile, the neotectonism in the accumulation stage provides advantages for hydrocarbon migration and filling.

Key words: apatite fission track, tectonic evolution, denudation thickness recovery, Cenozoic era, PL9-1 structure

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