Xinjiang Petroleum Geology ›› 2004, Vol. 25 ›› Issue (3): 270-273.

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The Modeling of Pressure Field Evolution History in Damintun Sag, Liaohe Basin

SHI Jian-nan1, JIANG Jian-qun2, LI Ming-kui2   

  1. 1. China University of Geosciences, W uhan, Hubei 430074, China;
    2. Liaohe Oilfield Company, PetroChina, Panjin, Liaoning 124010, China
  • Received:2003-08-12 Published:2020-09-18

Abstract: The pressure field evolution in Damintun Sag is modeled with Basin-2 simulator. The result indicates that overpressure preva-lently occurs in this area, which is characterized by vertical extension and deep expansion, and faults are important to control the accu-mulation and release of overpressure. The result is consistent with remaining pressure distribution of equivalent depth method, whichproves the reliability of the modeling result by using Basin-2 simulator. The evolution of overpressure is generally followed by such rule ofoverpressure changes as zero, steeply growing, gently increasing, up to the top, declining and the lowest, which is well matched with thedepressed process of this area. It is indicated that the overpressure greatly affects the generation, migration and accumulation of hydrocar-bons in it. In view of the distribution characteristics of overpressure in different strata, it is suggested that Late EgS, and Dongy ing forma-tion are the main hydrocarbon migration period and the traps in low-value area of residual pressure are favorable petroleum accumulationareas to be regarded as important domains for oil-gas exploration.

Key words: Liaohe basin, Damintun sag, pressure distribution, modeling, evolution

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