Lithologic Reservoirs ›› 2023, Vol. 35 ›› Issue (1): 96-107.doi: 10.12108/yxyqc.20230109

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Prediction and genesis of formation pressure in Dafengshan uplift, Qaidam Basin

YANG Taozheng1,2, LIU Chenglin1,2, TIAN Jixian3, LI Pei1,2, RAN Yu1,2, FENG Dehao1,2, LI Guoxiong1,2, WU Yuping1,2   

  1. 1. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing)， Beijing 102249, China;
    2. College of Geosciences, China University of Petroleum (Beijing)， Beijing 102249, China;
    3. PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China
  • Received:2022-05-06 Revised:2022-06-06 Online:2023-01-01 Published:2023-01-06

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Abstract: Overpressure prediction is of great significance to the study of oil and gas accumulation. By means of logging curve combination，cross plot of acoustic velocity and vertical effective stress，cross plot of acoustic velocity and density，and overpressure comprehensive analysis，the overpressure causes of each layer in Dafengshan uplift of Qaidam Basin were analyzed，and the pressure prediction method was improved. The results show that: (1) The overpressure of Xiayoushashan Formation in Dafengshan uplift of Qaidam Basin is caused by uneven compaction and tectonic compression，and the overpressure of Shangganchaigou Formation and upper Xiaganchaigou Formation is caused by uneven compaction，tectonic compression and overpressure transmission. (2) Single methods such as equilibrium depth method or Eaton method cannot be effectively used to predict the formation pressure in the study area. Based on the difference of different overpressure genesis mechanisms，the equilibrium depth method was used to calculate the formation pressure of Xiayoushashan Formation，and the Eaton method was used to calculate the formation pressure of Shangganchaigou Formation and upper Xiaganchaigou Formation，with more accurate results. The error between the calculated pressure and the measured formation pressure in the study area is less than 7.00%，and the average error is 4.30%. (3) Overpressure prediction can provide data support for reservoir description，reserve estimation and safe drilling operation. Overpressure is the driving force of oil and gas migration. It can be used to indicate the direction of oil and gas migration and estimate the distance of oil and gas migration，which has important guiding significance for the study of oil and gas accumulation.

Key words: equilibrium depth method, overpressure genesis, uneven compaction, tectonic compression, overpressure transmission, Dafengshan uplift, Qaidam Basin

CLC Number: 

  • TE122.2
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