基于卫星重力异常的渤海盆地秦南凹陷及邻区构造格局研究

doi:10.11720/wtyht.2023.1463

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Abstract

The Bohai Basin has the most offshore oil and gas fields discovered in China. As a potential hydrocarbon-rich sag in the Bohai Basin, the Qinnan Sag is of high value in exploration. Therefore, the study of the tectonic framework of the sag and its adjacent areas is of great significance and application value. Based on satellite gravity anomalies, this study determined the Bouguer gravity anomalies by correcting the influences of land topography and seawater and obtained the planar distribution and apparent depths of faults, the thickness of Cenozoic strata, and the boundaries of tectonic units using methods such as the normalized vertical derivative of the total horizontal derivative (NVDR-THDR), the Euler deconvolution, the minimum curvature potential field separation, and the fast for the gravity field based in a dual interface model. Based on the geological and geophysical data, this study analyzed the distribution and geophysical characteristics of major faults and tectonic units in the study area. The results of this study are as follows: The faults in the Qinnan Sag and its adjacent areas mainly have NE, NEE, and NW strikes and an apparent depth of primarily 1~10 km, which is up to 15~25 km at some positions of the sag-controlling faults and the intersections of the faults; The Cenozoic strata have a thickness of 0~11 km. The Cenozoic tectonic units are distributed in alternating NE and NEE directions, and their boundaries are mostly controlled by faults; Through further investigation, this study classified the sub-sag on the west side of the Qinnan sag as the Laoting sag and adjusted the boundaries of other tectonic units. The results of this study on the distribution of the faults and tectonic units can provide geophysical data for hydrocarbon exploration in the Qinnan Sag.

Key words： satellite gravity anomaly Qinnan Sag tectonic unit fault

Received: 21 September 2022 Published: 05 July 2023

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	Rong-Xiang YANG
	Wan-Yin WANG
	Meng-Ke CAI
	Ding-Ding WANG
	Xin-Gang LUO

Cite this article:

Rong-Xiang YANG,Wan-Yin WANG,Meng-Ke CAI, et al. A study of tectonic framework of the Qinnan sag in Bohai Basin and its adjacent areas based on satellite gravity anomalies[J]. Geophysical and Geochemical Exploration, 2023, 47(3): 584-596.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2023.1463 OR https://www.wutanyuhuatan.com/EN/Y2023/V47/I3/584

Regional geological background map of Bohai basin

Stratum core density in Chengning uplift, Dagang region^[19]

Topographic map of Qinnan Sag and its surrounding areas

Satellite gravity anomaly of Qinnan Sag and its surrounding areas

Bouguer gravity anomaly of Qinnan Sag and its surrounding areas

Comparison of previous fault division with Bouguer gravity anomaly NVDR-THDR(a and b) and residual Bouguer gravity anomaly zero line (c and d) in Qinnan Sag and its adjacent areas

The contrast figure of seismic geological section position (a) and faults in Qinnan Sag and its adjesent areas (b)

The distribution of faults plane position in Qinnan Sag and its adjacent areas

The apparent depth in Qinnan Sag and its adjacent areas

Rose diagrams of fault strike and frequency (a) and length (b) in Qinnan Sag and adjacent areas

Statistical histogram of fracture length and number (a) in Qinnan Sag and adjacent areas (b)

17]; (b) Xia Qinglong et al.^[1]; (c) Hu Zhiwei et al.^[8]; (d) Yang Keji et al. ^[12]; the black lines are the result of this paper
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Comparison of main fracture distribution in Qinnan Sag and adjacent areas with previous results
the red lines are the faults deduced by (a) Liu Zilin^[17]; (b) Xia Qinglong et al.^[1]; (c) Hu Zhiwei et al.^[8]; (d) Yang Keji et al. ^[12]; the black lines are the result of this paper

Thickness of Cenozoic in Qinnan Sag and its surrounding areas

Residual bouguer gravity anomaly map of Qinnan Sag and adjacent areas

Division results of tectonic units in Qinnan Sag and adjacent areas

Comparison of the division results of tectonic units in Qinnan Sag and adjacent areas with previous studies

The relationship between faults and tectonic units in Qinnan Sag and adjacent areas

编号(名称)		构造位置	识别标志	走向	长度/km	视深度/km	级别
F_1-1	郯庐断裂东支	渤海盆地东部边界	布格重力异常NVDR- THDR脊值连线	NE	71.4	5~20	控坳
F_1-2	郯庐断裂东支	渤东凹陷与庙西北凸起分界	布格重力异常NVDR- THDR脊值连线	NE—近SN	63.8	5~15	控坳
F_1-3	郯庐断裂西支	辽中凹陷与辽东凸起分界	布格重力异常NVDR-THDR 脊值连线与剩余布格重力异常零值线	NE	79.5	10~20	控坳
F_1-4		渤东低凸起和渤中凹陷边界	布格重力异常NVDR- THDR脊值	NE	85.5	5~15	控坳
F_1-5		渤中凹陷内	布格重力异常NVDR- THDR脊值	NE	33.9	1~5	控坳
F_1-6	秦皇岛— 旅顺断裂	辽东湾坳陷与辽中凹陷分界断裂	布格重力异常NVDR-THDR 脊值连线及错断	NW	179.8	5~20	控坳
F_1-7	张家口— 蓬莱断裂	渤中坳陷与济阳坳陷的分界	布格重力异常NVDR- THDR脊值错断	NW	106.9	5~10	控坳
F_2-1		辽东凹陷和辽东凸起及辽中凹陷分界	布格重力异常NVDR-THDR 脊值连线与剩余布格重力异常零值线	NE	82.7	10~25	控凹
F_2-2		辽中凸起和辽中凹陷分界	NVDR-THDR脊值连线	NE	73.2	5~15	控凹
编号(名称)		构造位置	识别标志	走向	长度/km	视深度/km	级别
F_2-3		辽西凹陷和辽中凸起分界	布格重力异常NVDR-THDR 脊值连线与剩余布格重力异常零值线	NE	65.0	5~15	控凹
F_2-4		辽西凸起和辽西凹陷分界	NVDR-THDR脊值连线	NE	49.8	5~10	控凹
F_2-5		渤东凹陷内	布格重力异常NVDR-THDR 脊值连线与剩余布格重力异常零值线	NE—近SN	91.0	5~15	控凹
F_2-6		石臼坨凸起和渤中凹陷分界	布格重力异常NVDR-THDR 脊值连线与剩余布格重力异常零值线	近EW	137.4	5~15	控凹
F_2-7		石臼坨凸起北侧	布格重力异常NVDR-THDR 脊值连线与剩余布格重力异常零值线	近EW—NEE	119.6	5~20	控凹
F_2-8		秦南凹陷南侧	布格重力异常NVDR-THDR 脊值连线	NEE	131.2	10~20	控凹
F_2-9		昌黎凹陷南部	布格重力异常NVDR-THDR 脊值连线与剩余布格重力异常零值线	NW	49.0	15~20	控凹
F_2-10		秦南凸起内部	布格重力异常NVDR-THDR 脊值连线与剩余布格重力异常零值线	NNE	36.5	10~15	控凹
F_2-11		秦南凸起内部	布格重力异常NVDR- THDR脊值连线	NNE	33.2	10~15	控凹
F_2-12		乐亭凹陷东侧	布格重力异常NVDR- THDR脊值连线	NNW—NNE	19.5	5~15	控凹
F_2-13		乐亭凹陷东南侧	布格重力异常NVDR- THDR脊值连线	NNW	13.7	10~15	控凹
F_2-14		秦南凹陷西侧	剩余布格重力异常零值线	NNE	11.8	10~15	控凹
F_2-15		乐亭凹陷内部	布格重力异常NVDR- THDR脊值连线	NEE—NNE	31.6	5~15	控凹
F_2-16		乐亭凹陷西北侧	布格重力异常NVDR-THDR 脊值连线与剩余布格重力异常零值线	NE	35.2	5~10	控凹
F_2-17		乐亭凹陷西北侧	布格重力异常NVDR- THDR脊值连线	NE	34.7	15~20	控凹
F_2-18		老王庄凸起东北侧	布格重力异常NVDR-THDR 脊值连线与剩余布格重力异常零值线	NWW	76.0	10~15	控凹
F_2-19		乐亭凹陷东北侧	布格重力异常NVDR- THDR脊值连线	NWW	66.9	5~10	控凹
F_2-20		老王庄凸起东南侧	布格重力异常NVDR- THDR脊值连线	NE	39.6	10~20	控凹
F_2-21		石臼坨凸起西侧	布格重力异常NVDR- THDR脊值连线	NEE	27.6	5~10	控凹
F_2-22		渤中凹陷内部	布格重力异常NVDR- THDR脊值错断	NW	70.8	1~10	控凹
F_2-23		沙垒田凸起南侧	布格重力异常NVDR- THDR脊值连线	EW—NE	72.5	5~15	控凹
F_2-24		南堡凹陷南侧	布格重力异常NVDR- THDR脊值连线	近EW	43.0	5~15	控凹
F_2-25		沙垒田凸起内部	布格重力异常NVDR- THDR脊值连线	NNE	30.8	5~10	控凹

Statistical table of fracture properties in study area

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