吐哈盆地北部凹陷带低渗透储层特征及控制因素

吐哈盆地北部凹陷带三叠系及侏罗系储层属岩屑砂岩及长石岩屑砂岩，是晚成岩Ａ期产物，成分及结构成熟度均低；沉积相多属扇三角洲平析相，孔隙类型为次生孔隙，可划分为６种低渗透储层类型。指出沉积环境及物源控制着储层性质，成岩作用使物性进一步变差，有机酸的溶解作用改善了性能。

LOW PERMEABILITY RESERVOIRS IN TAIBEI SAG,TURPAN-HAMI BASIN:CHARCTERISTICS AND CONTROLLING FACTORS

Reservoirs occured in the Triassic and the Jurassic in Taibei sag, Turpan--Hami Basin are lithic sandstone and feldspathlc litharenite deposited mainly in the fan- dwlta plain factes and characterized by low maturity both in component and texture. Diagenesis studies show that the reservoirs are within the period- A of the metaharmosis in which secondary pores are well- developed. As a result, 6 types of low permeability reservoirs can be classified within the area. obviously, the reservoir properties are controlled mainly by the initial sedimentary environment, and secondly but negatively influenced by the diagenesis, and then improved by the corrosion of the organic-acid fluid.