南海北部新生代构造应力反演及其动力学背景探讨*

doi:10.11978/2017047

热带海洋学报 ›› 2018, Vol. 37 ›› Issue (2): 63-71.doi: 10.11978/2017047CSTR: 32234.14.2017047

所属专题：南海专题

南海北部新生代构造应力反演及其动力学背景探讨*

刘见宝^1,²(), 孙珍³(), 王振峰⁴, 黄安敏⁴, 曾小宇⁴

1. 河南理工大学, 河南焦作 454000
2. 河南工程学院, 资源与环境学院, 河南郑州 451191
3. 中国科学院边缘海与大洋地质重点实验室(南海海洋研究所), 广东广州 510301
4. 中海石油(中国)有限公司湛江分公司, 广东湛江 524057

收稿日期:2017-04-18 修回日期:2017-06-30 出版日期:2018-04-10 发布日期:2018-04-11
作者简介:
作者简介: 刘见宝（1982—）, 男, 河南省开封市人, 讲师, 博士后, 现从事构造地质的研究、教学工作。Email：514348839@qq.com
基金资助:
国家自然科学基金(41206037);河南工程学院博士基金项目(D2015010)

Cenozoic tectonic stress inversion in the northern South China Sea and its dynamic background

Jianbao LIU^1,²(), Zhen SUN³(), Zhenfeng WANG⁴, Anmin HUANG⁴, Xiaoyu ZENG⁴

1. Henan Polytechnic University, Jiaozuo 454000, China
2. School of Resource and Environment, Henan Institute of Engineering, Zhengzhou 451191, China
3. CAS Key Laboratory of Marginal Sea and Ocean Geology, South China Sea Institute of Oceanology, Guangzhou 510301, China
4. Zhanjiang Technical Department, China National Offshore Oil Corporation, Zhanjiang 524057, China

Received:2017-04-18 Revised:2017-06-30 Online:2018-04-10 Published:2018-04-11
Supported by:
National Natural Science Foundation of China (41206037);Doctoral foundation of Henan University of Engineering (D2015010)

摘要/Abstract

摘要：

南海北部为我国重要的含油气区之一, 但目前南海北部盆地的演化史及其与周边构造事件的关系仍不明确。基于钻孔和地震资料, 通过数学模拟, 反演了琼东南盆地和珠江口盆地的构造应力演化特征和初始地壳厚度。结果表明, 南海北部盆地具有较薄的初始地壳厚度和岩石圈厚度。珠江口盆地存在两期应力松弛期, 而琼东南盆地在深水区和浅水区分别存在一期应力松弛期。南海北部第一期应力松弛在空间上具有连续性, 主要分布在深水区, 在时间上东早西晚; 第二期应力松弛空间上存在东西分异性。分析认为, 南海北部深水区应力松弛期由东至西的演化应为西北次海盆由东至西的剪刀式张裂所致。珠江口盆地第二期构造应力松弛与局部岩浆侵入有关, 琼东南盆地浅水区的构造应力松弛期与红河走滑断裂平静期相对应。

关键词: 南海北部, 新生代, 构造应力反演, 初始地壳厚度

Abstract:

The northern part of the South China Sea (SCS) is one of the important oil and gas bearing areas in China. However, the evolution history of the basins located in the northern SCS and their relationship with the surrounding tectonic events are still unclear. Based on the drilling and seismic data, the tectonic stress evolution characteristics and the initial crustal thickness of the Qiongdongnan Basin and Pearl River Mouth Basin are calculated by using mathematical simulation. The results show that the basins of the northern SCS have thinner initial crust thickness and lithospheric thickness. There exist two stress relaxation periods in the Pearl River Mouth Basin, and two stress relaxation periods in the Qiongdongnan Basin, one in shallow water and the other in deep water. The first period of stress relaxation in the northern SCS was continuous in space, which is mainly distributed in the deep water area, and was earlier in the east and later in the west. The second period was different in the east and west. The analysis shows that the stress relaxation periods in the deep water of the northern SCS were related with shear rifting from east to west of the northwest sub-basin of the SCS. The second period of stress relaxation in the Pearl River Mouth Basin was related to local magmatic intrusion, and the stress relaxation period in the shallow water of the Qiongdongnan Basin corresponded to the quiet period of the Red River fault.

Key words: northern South China Sea, Cenozoic, structural stress inversion, initial crustal thickness

刘见宝, 孙珍, 王振峰, 黄安敏, 曾小宇. 南海北部新生代构造应力反演及其动力学背景探讨*[J]. 热带海洋学报, 2018, 37(2): 63-71.

Jianbao LIU, Zhen SUN, Zhenfeng WANG, Anmin HUANG, Xiaoyu ZENG. Cenozoic tectonic stress inversion in the northern South China Sea and its dynamic background[J]. Journal of Tropical Oceanography, 2018, 37(2): 63-71.

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地层单元		琼东南盆地			珠江口盆地
系	统	组	界面	时间/Ma	组	界面	时间/Ma
第四系		乐东组	T20	1.64		T20		1.8
新近系	上新统	莺歌海组	T30	5.5	万山组	T30	5.3
	中新统	黄流组	T40	10.5	粤海组	T32	10.5
		梅山组	T41	13.8	韩江组	T40	16
		梅山组	T50	15.5	韩江组	T40	16
		三亚组	T51	16.5	珠江组	T50	18.5
			T52	17.5		T50	18.5
			T60	21		T60	23.8
古近系	渐新统	陵水组	T61	23	珠海组	T70	30
			T62	25.5
			T70	30
		崖城组	T71	32	恩平组	T80	39
		崖城组	T80	36	恩平组	T80	39
	始新统		T100	54	文昌组	T90	49
	古新统				神狐组	Tg	65
前新生界

参数符号	参数名称	取值
k	温度扩散系数	10^-6m²·s^-1
α	热膨胀系数	3.0×10^-5K^-1
φ	随深度变化的脆性破坏	24.0MPa·km^-1
υ^*	孔隙水与岩石基质的密度比	0.38
c	比热	1050J·kg^-1·K^-1
ρ_0uc	0℃状态上地壳密度	2800kg·m^-3
ρ_0lc	0℃状态下地壳密度	2900kg·m^-3
ρ_0m	0℃状态地幔密度	3300kg·m^-3
H	放射热源	0.647μW·m^-3
R	气体常数	8.314J·mol^-1·K^-1
A^*_uc	上地壳材料常数	1.10000×10^-21Pa^-ⁿ·s^-1
n_uc	上地壳应力幂指数	2.61
Q_uc	上地壳蠕变活化能	145kJ·mol^-1
A^*_lc	下地壳材料常数	5.60000×10^-23Pa^-ⁿ·s^-1
n_lc	下地壳应力幂指数	3.20
Q_lc	下地壳蠕变活化能	238kJ·mol^-1
A^*_m	地幔材料常数	1.90000×10^-15Pa^-ⁿ·s^-1
n_m	地幔应力幂指数	3.00
Q_m	地幔蠕变活化能	420kJ·mol^-1

钻井	现今水深/m	位置	t_c+/km	t_c- (a=60km)	t_c- (a=90km)	t_c- (a=125km)	t_c- (a=150km)
ZHU001	120	浅水	17.0	27~30	28~31	30~33	32~34
ZHU003	100	浅水	17.0	32~35	34~36	37~39	39~41
QB001	195	浅水	17.0	25	25~26	27~29	30~31
QB002	195	浅水	14.7	29~32	31~34	35~37	37~39
QB003	180	浅水	13.5	26~28	28~30	32~33	35~36
QB004	100	浅水	9.5	20~21	23~24	n/a	n/a
QB005	110	浅水	8.5	23	26~28	31~32	n/a
QB006	150	浅水	14.9	25~28	28~30	32~33	36
ZHU002	950	深水	15.0	35~38	37~39	41~42	43~45
SIMUE0	1670	深水	6.5	30~32	34~35	38~40	41~42
SIMUW0	710	深水	3.5	29	n/a	n/a	n/a
QB007	1730	深水	7.9	25~27	29~30	34	37
QB008	1500	深水	13.9	31~34	34~36	38~40	41~42
QB009	1460	深水	17.0	32~34	34~36	38~39	40~42

南海北部新生代构造应力反演及其动力学背景探讨*

Cenozoic tectonic stress inversion in the northern South China Sea and its dynamic background

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