Lithologic Reservoirs ›› 2019, Vol. 31 ›› Issue (6): 36-43.doi: 10.12108/yxyqc.20190604

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

Distribution and genetic mechanism of overpressure in western Sichuan foreland basin

WANG Zhihong1,2, HAO Cuiguo1, LI Jianming3,4, FENG Zhenzhi5, HUANG Changwu1   

  1. 1. PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China;
    2. Key Laboratory of Gas Reservoir Formation and Development, CNPC, Langfang 065007, Hebei, China;
    3. School of Geosciences, Yangtze University, Wuhan 430100, China;
    4. Unconventional Oil and Gas Collaborative Innovation Center of Hubei Province, Wuhan 430100, China;
    5. No.3 Oil Production Plant, PetroChina Huabei Oilfield Company, Cangzhou 062450, Hebei, China
  • Received:2019-05-05 Revised:2019-07-09 Online:2019-11-21 Published:2019-09-28

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Abstract: Formation overpressure is one of the main driving forces for hydrocarbon migration and accumulation. In order to study the distribution and genetic mechanism of the Triassic-Jurassic overpressure system and its contribution to natural gas reservoir formation in western Sichuan,a quantitative study on the genetic mechanism based on comprehensive compaction models and differential stress models was carried out. The results show that:(1)There are four types of overpressure distributed vertically in the Upper Triassic-Jurassic in western Sichuan:bell-shaped,spindle-shaped,step-shaped and composite type,which are distributed in the front edge of nappe,southwest Sichuan,northwest Sichuan and central Sichuan respectively. The first two types have a weak preservation ability of fluids,while the latter two ones have a strong storage retention ability to fluids.(2)The central and northern parts are the center of the overpressure zone in the Upper Triassic strata,while the overpressure center in the Jurassic strata is in the central area with the abnormal amplitudes descending to its periphery areas, and the hydrostatic pressure is maintained in the piedmont area of the Longmen Mountains.(3)The development of abnormal formation pressure in western Sichuan Basin has undergone the stages of sedimentary overpressure (Late Triassic-Eocene)and tectonic overpressure(Oligocene to present),of which the Late Triassic-Early Cretaceous is the supercharging stage of the sedimentary overpressure,and the Late Cretaceous-Eocene is the dissipation stage of the sedimentary overpressure.(4)The present overpressure is superimposed by residual sedimentary overpressure and overpressure resulted from tectonic compression. For the overpressure in the central and northern regions,the contribution of tectonic compression pressurization is 30% to 60%,while the overpressure in the south is mostly caused by the tectonic compression pressurization. The residual sedimentary overpressure is mainly formed by hydrocarbon generation in the middle and late stages of Yanshanian movement period. The research results have guiding significance for finding overpressure reservoirs.

Key words: overpressure reservoirs, sedimentary pressurization, hydrocarbon generation pressurization, tectonic compression pressurization, foreland basin, western Sichuan Basin

CLC Number: 

  • TE121.1
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