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

Abstract

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

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.

Figures/Tables 7

Tab. 1

Tab. 2

Fig. 1

Fig. 2

Tab. 3

Fig. 3

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References 36

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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

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

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