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Distribution characteristics of tectonic units in Pearl River Mouth basin based on magnetic data |
Ling-Yan XIA1,2, Chang-Song LIN1, Xiao LI2, Yue HU2 |
1. China University of Geosciences, Beijing 100083,China 2. China Aero Geophysical Survey and Remote Sensing Center for Natural Resources,Beijing 100083, China |
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Abstract The Pearl River Mouth basin is the largest pre-Cenozoic sedimentary basin on the continental slope of the South China Sea. It is rich in oil and gas resources. Due to the lack of new geophysical data, the distribution characteristics of the internal tectonic units in the Pearl River Mouth basin have many different views. This problem has constrained further exploration and development of the basin. This study aims to throw light on the magnetic basement structure of Pearl River Mouth basin based on the latest high resolution aeromagnetic data, combined with drilling data, seismic profiles and basic geological data. Tangent method was used in the inversion. On the basis of fully investigating the existing structural unit division in the Pearl River Mouth basin and in combination with the faults and regional structures, the internal tectonic units were studied. The result shows that the magnetic basement depth of the basin is between 0 and 9 km, and the magnetic basement is characterized by "three uplift and two depressions". The whole depression area has the characteristics of "north-south zoning, east-west sub-block". The NE trending fault is the main fault that controls sedimentary depression, while the NW-trending faults are secondary faults which control depressions.
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Received: 23 February 2019
Published: 31 May 2019
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Magnetic anomaly of Pearl River Mouth Basin
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Frequency domain accidentally horizon magnetic direction angle conversion result of Pearl River Mouth Basin
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钻井编号 | 基岩性质 | 钻遇深度/m | 计算深度/m | 误差/m | 误差/% | HF28-2-1 | 闪长岩 | 3942 | 3800 | -142 | -3.6% | HF33-3-1 | 闪长玢岩 | 3278 | 3100 | -178 | -5.4% | LF22-1-1 | 花岗岩 | 1725 | 1700 | -25 | -1.4% | LF35-1-1 | 花岗闪长岩 | 2475 | 2900 | 425 | 17.1% | LH4-1-1 | 安山岩 | 1977 | 2200 | 223 | 11.2% | LH29-1-1 | 花岗岩 | 3245 | 3100 | -145 | -4.4% | PY16-1-2 | 火山碎屑岩 | 2479 | 2300 | -179 | -7.2% | BY6-1-1 | 凝灰岩 | 5166 | 5000 | -166 | -3.2% | YJ26-1-1 | 花岗斑岩 | 1703 | 1600 | -103 | -6.0% | ZHU7 | 花岗岩 | 3664 | 3800 | 136 | 3.7% | PY4-1-1 | 花岗岩 | 3139 | 3400 | 261 | 8.3% | ZHU1 | 花岗岩 | 1728 | 1700 | -28 | -1.6% | HZ10-1-1 | 花岗岩 | 2591 | 2400 | -191 | -7.3% | EP18-1-1 | 花岗岩 | 3426 | 3300 | -126 | -3.6% | BY7-1-1 | 玄武岩 | 2432 | 2600 | 168 | 6.9% | LF25-1-1 | 凝灰岩 | 2320 | 2000 | -320 | -13.8% | WC15-1-1 | 变质岩 | 1426 | 1400 | -26 | -1.8% |
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Compasion of metamorphosed basement rock and magmatite depth revealed by drilling and calculation of Pearl River Mouth Basin
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Superposed map of areomagnetic ΔT vertical first-order derivative contours with magnetic substance depth of Pearl River Mouth Basin
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Map of magnetic basement and faults of Pearl River Mouth Basin
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Map of internal tectonic units of Pearl River Mouth Basin
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二级构造单元 | 三级构造单元(对应图5构造单元编号) | 琼粤隆起 | | 闽粤隆起 | | 北部断阶带 | | 珠一坳陷 | 韩江凹陷(1) | 韩东凸起(2) | 陆丰凹陷(3) | 海丰凸起(4) | 惠州凹陷(5) | 惠陆凸起(6) | 西江凹陷(7) | 惠西凸起(8) | 恩平凹陷(9) | 西江南凸起(10) | 番一凹陷(13) | 西江北低凸起(11) | 番二凹陷(14) | 恩西凸起(12) | 番禹低隆起(15) | 珠三坳陷 | 阳江凹陷(16) | 阳江北低凸起(17) | 文昌凹陷(18) | 阳江凸起(19) | 东沙隆起 | 东一凹陷(20) | 东二凹陷(21) | 神狐隆起 | 神一凹陷(22) | 神二凹陷(23) | 珠二坳陷 | 开平凹陷(24) | 顺开西凸起(25) | 顺德凹陷(26) | 顺开东凸起(27) | 白云凹陷(28) | 白云凸起(29) | 云开低隆起(30) | 珠四坳陷 | 兴宁凹陷(31) | 兴宁低凸起(32) | 荔湾凹陷(33) | 潮汕坳陷 | 潮州凹陷(34) | 潮汕凸起(35) | 汕头凹陷(36) | 一统暗沙隆起 | |
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Tectonic units and name of Pearl River Mouth Basin
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