台湾海峡盆地九龙江凹陷新生代关键构造变革及其油气地质意义

doi:10.11743/ogg20190116

摘要/Abstract

摘要：

油气成藏与区域构造背景及盆地的形成演化发展密切相关。以二维多道地震资料为基础，并结合区域地质资料综合分析，认为九龙江凹陷经历了4期关键构造变革，形成了太平运动、瓯江运动、浦里运动和海岸山运动4个关键构造变革期不整合界面。在不同时期由于受不同的地球动力学背景和构造应力场控制，九龙江凹陷发育了阶梯状式、垒-堑式和滑动断阶式三种伸展构造样式，以及断层限制型与褶皱挠曲型二种反转构造样式。通过对各时期构造应力背景及油气成藏条件分析，认为太平、瓯江运动二期构造变革奠定了九龙江凹陷圈闭的形成基础，是造成拉张型构造圈闭发育的重要因素，晚期瓯江运动所造成的凹陷挤压抬升促使了反转构造的形成，可以形成良好的油气聚集圈闭条件。

关键词: 构造运动, 构造变形, 油气地质, 九龙江凹陷, 台湾海峡

Abstract:

Hydrocarbon accumulation is closely related with regional tectonic setting and basin formation and evolution.It's pointed out that four stages of critical tectonic transformation occurred in Jiulongjiang Sag through the analysis of two-dimensional multichannel seismic data and regional geological data.As a result, four unconformities formed during the Taiping,Oujiang,Puli and Hai'anshan movements.Controlled by different geodynamic backgrounds and tectonic stress fields at different stages,three styles of extensional structures,namely the stepwise,horst-graben and sliding fault terrace,and two styles of inverted structures,namely fault-restricted and flexural fold structures,are developed in the sag.Through the analysis of tectonic stress backgrounds and hydrocarbon accumulation conditions at different stages,it is believed that the Taiping and Oujiang movements laid the foundation for the formation of traps in the Jiulongjiang Sag,and was a major factor for the development of extensional structural traps;while the uplifting caused by the compressive force from the late Oujiang movement prompted the formation of inverted structures,providing favorable trap conditions for hydrocarbon accumulation.

Key words: tectonic movement, tectonic deformation, key tectonic transformation, petroleum geology, Jiulongjiang Sag, Taiwan Strait

中图分类号:

TE121.1

钱星,张莉,易海,等. 台湾海峡盆地九龙江凹陷新生代关键构造变革及其油气地质意义[J]. 石油与天然气地质, 2019, 40(1): 162-169. doi: 10.11743/ogg20190116 Qian Xing,Zhang Li,Yi Hai,et al. Key Cenozoic tectonic transformation in Jiulongjiang Sag,Taiwan Strait Basin and its petroleum geologic significance[J]. Oil & Gas Geology, 2019, 40(1): 162-169. doi: 10.11743/ogg20190116

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