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Tianyao Hao

Tianyao Hao

Chinese Academy of Sciences, China

Title: Magnetic basement and its petroleum geological significance in Sichuan Basin

Biography

Biography: Tianyao Hao

Abstract

Sichuan Basin is the basin with the largest number of proven gas reserves, the number of gas fields found and the cumulative output of gas in China. The study of basement structure of the basin is very important in the deep oil and gas exploration. The research concerned on the structure of Sichuan basin’s basement based on aeromagnetic data. We improved the method of determining the residual magnetization direction by the maximum cross-correlation method based on the vertical gradient and the total gradient of the magnetic anomaly. This reduction to the pole (RTP) method of magnetic anomalies considering the residual magnetization direction makes the result more reliable. We obtained residual basement magnetic anomaly (RBMA) from aeromagnetic data, then inverted the undulating magnetic basement and its susceptibility distribution, divided the magnetic basement of Sichuan Basin into 7 parts and discussed the controlling effect of Sichuan basin’s magnetic basement on oil and gas migration and accumulation. Besides, the basement faults system was patterned with the help of the directional derivative, vertical derivative and horizontal gradient of the RBMA. The magnetic basement obtained in this paper is the top interface of lower mesoproterozoic with a depth of 3~10 km, which reflects the tectonic morphology and undulating characteristics of the deep metamorphic crystalline basement in the basin. The large inherited paleo-uplift developed on the magnetic basement uplift provides the conditions for the formation and aggregation of the pre-Cenozoic oil and gas. 

Figure-1: The depth of magnetic basement in the Sichuan Basin.

Recent Publications

  1. Liu K, Hao TY (2014) Application of potential field method in the unconventional oil and gas exploration. Progress in Geophysics 29(2): 786-797.
  2. Shi L, Meng XH, Guo LH, Chen S, Xu WM  (2014) A simple algorithm for estimating the magnetization direction of magnetic bodies under the influence of remanent magnetization. Progress in Geophysics 29(4):1748-1751.
  3. Hao TY, Xu Y, Zhao BM, Zhang YJ, Peng LL (2009) Geophysical research on distribution features of magnetic basements in the South China Sea. Chinese Journal Geophysics 52(11): 2763-2774.
  4. Cooper GRJ, Cowan DR (2005) Differential reduction to the pole. Computers & Geosciences 31:989–999.
  5. Neal D, Li YG (2006) A new method for determination of magnetization direction. Geophysics 71(6):69-73.