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长庆气田陕１４１井区属于鄂尔多斯盆地靖边三角洲的一部分，上古生界天然气藏的储集体为三角洲平原分流河道砂体及三角洲前缘水下分流河道砂体，河口砂坝相沉积。集集空间主要是充填剩余袜间孔和次生溶蚀孔及微裂缝 。

RESERVOIR CHARACTERISTICS OF GAS DEPOSIT IN THE UPPER PALEOZOIC AT WELL SHAAN 141 AREA IN EERDUOSI BASIN

??The well-Shaan 141 area of Changqing gas field occupies a part of Jingbian delta in Eerduosi Basin and the Late Carboniferous-Early Permian reservoir rock bodies in this area belong to the delta plain and delta front submerged distributary channel sand bodies and debouch bar facies deposits.Storage space is mainly the unfilled intergranular pores and secondary solution pores(including solution intergranular and intragranular pores,and moldic pores,etc.)and microfissures.There are different storage space combinations in different kinds of reservoir rocks.The storage space in lithic sandstone consists of the secondary solution pores,intercrystalline pores and microfissures,and that in quartzose sandstone is mainly the unfilled intergranular pores,intergranular solution pores and kaolinic intercrystalline pores.The radius of pore throat is on the small side and its structure is complex.The reservoirs belong to the low porosity and low permeability ones,being of porosities of 4.8% and permeabilities of 0.1×10^-3-1×10^-3??m² in general.Through research it is thought that the gas reservoir type in this area belongs to the lithologic trap gas reservoir;the key elements of controlling gas reservoir formation are the combination pattern of the caprocks and reservoirs and the sealing capability and distribution area of the caprocks;and the distribution of the gas reservoirs is controlled by braided channel sand bodies.