Research Advances for the Genesis ofAbnormally Low Formation Pressure in Petroliferous Basins
Received date: 2008-01-28
Revised date: 2008-03-23
Online published: 2008-06-10
Based on various geological factors, the genesis mechanisms of abnormally low formation pressure (ALFP) were analyzed systematically. The operating range and levels which they act on are obviously different from each other. The main areal reasons for ALFP coming into being, especially in the basins with frequent vertical tectonic movement, are the strata uplifting, the overlying formation erosion and the stratum temperature drop, which were caused by vertical crust uplift movement; lighter hydrocarbon diffusion plays a role in reducing the ALFP of hydrocarbon pools; ALFP that caused by fluid density difference is always related to the regional inclination of seam, it’s a reason for the pressure reduction in deep basin gas pools; hydraulic head probably take effect in the superficial fluid pressure system, but do less work in the deep fluid pressure system. The ion pervasion, reservoir property differences and the chemical actions of formation water is subsidiary in the practical ALFP generation; underground fluid extracting doesn’t influence the original stratum pressure. In different petroliferous basins, it’s necessary to make concrete analysis for concrete conditions when the ALFP is being studied.
GAO Gang ;GANG Wen-zhe ;FAN Hong-che ;SANG Ting-yi ; NIE Chao-qiang . Research Advances for the Genesis ofAbnormally Low Formation Pressure in Petroliferous Basins[J]. Natural Gas Geoscience, 2008 , 19(3) : 311 -315 . DOI: 10.11764/j.issn.1672-1926.2008.03.311
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