Journal of Jilin University(Earth Science Edition) ›› 2018, Vol. 48 ›› Issue (3): 863-871.doi: 10.13278/j.cnki.jjuese.20160320

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Basement Structure of Western Chuxiong Basin in Yunnan Province: Using High-Precision Gravity-Magnetic-Electrical Survey

Zhang Cong1,2, Shi Dishi1,2, Zhang Ziya1,2, Chen Ke1,2, Yuan Kun2, Qiao Jihua3, Peng Fangping4   

  1. 1. The Key Laboratory of Unconventional Oil & Gas Geology, China Geological Survey, Beijing 100029, China;
    2. Oil & Gas Survey, China Geological Survey, Beijing 100083, China;
    3. Development of Geological and Research Center, China Geological Surveys, Beijing 100037, China;
    4. Beijing Technology and Engineering Co., Ltd, Beijing 100192, China
  • Received:2017-09-07 Online:2018-05-26 Published:2018-05-26
  • Supported by:
    Supported by Project of Investigation and Evaluation of the National Oil and Gas Resources Strategic Selection of Ministry of Land and Resources (XQ2014-04-02) and Project of China Geological Survey (121201021000150011)

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Abstract: Chuxiong basin is the largest petroleum-bearing basin in the Yunnan-Guizhou-Guangxi area, but its progress of oil and gas exploration is slow. The key issue is the unclear structure of the basement and sedimentary caprock. Two parallel exploration profiles were obtained based on the high precision gravity, magnetic and electrical data,and the basement characteristics and stratigraphic structure were figured out hereupon. The comprehensive exploration results show that the maximum burial depth of bottom boundary is 7 km in the Upper Triassic in the western Chuxiong basin. The overall trend of Chuxiong basin is north-west, and the maximum depth of the crystallization basement is 9 km between the Pingchuan-Yunnanyi-Honghe and the Menghu-Shezi faults. The largest magnetic basement sag in Chuxiong basin exists between Dayao County and Nanhua County, with an area of 1 200 km2.

Key words: basement structure, gravity, magnetic, magnetotelluric, Chuxiong basin

CLC Number: 

  • P59
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