关键词: 吸附气藏, 等温吸附, 吸附层密度, 物质平衡

Abstract:

In order to study the favorable distribution area of lithologic traps in Bohu Depression ofYanqi Basin, based on seismic sequence division, the amplitude, frequency, continuity, internal structure and external formof seismic reflection wave were applied to analyze the seismic facies in the study area, and the seismic facies of the target zone can be divided into six types. The seismic facies is transformed into sedimentary facies bymeans of well-seismic combination. The result shows that six types of sedimentary facies are distinguished in the lower segment of Sangonghe Formation of Bohu Depression, including alluvial fan, braided river delta plain, delta front, shore-shallowlacustrine, turbidite fan and semideep lake facies. Meanwhile, there developed five types of larger sedimentary bodies, which corresponds to the three
provinces in the northwest, northeast and south of the study area. It is considered that lithologic traps are less developed in the lower segment ofSangonghe Formation, only formed in the locally developed mouth bar, shore-shallowlacustrine beach bar and turbidite fan.

Key words: adsorbed gas reservoir, isothermal adsorption, adsorbed layer density, material balance