川东北天然气成藏特征

doi:10.11743/ogg20040307

Abstract

Abstract:

Gas reservoirs in northeastern Sichuan basin are distributed in three overpressured systems,i.e.Lower Cambrian-Silurian(∈₁-S),Lower Permian-Lower Triassic(P₁-T₁)and Upper Triassic-Middle Jurassic(T₃-J₂),and are characterized by multilayer superimposition.The scale of gas accumulations depends on degasification of water-soluble gas under overpressured condition.A burial depth of 4500m can be taken as boundary,under which water is produced,while above which gas is produced,and gas output increases along with the increase of uplifting.Formation and preservation of gas accumulations in northeastern Sichuan basin are determined by burial depth in Yanshan period,elevation in Himalayan period and preservation of abnormal pressure system.Pressure sealing is the key factor to gas accumulation.Therefore,gas exploration in this area should be based on prospecting the superimposed multilayers,and aiming at the overall abnormal pressure system.

Key words: gas accumulation, overpressured system, water-soluble gas, pressure seal, northeastern Sichuan basin

CLC Number:

TE112

Xu Yangang, He Ziai, Zeng Fangang. Characteristics of gas accumulation in northeastern Sichuan basin[J]. Oil & Gas Geology, 2004, 25(3): 274-278.

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Characteristics of gas accumulation in northeastern Sichuan basin

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