准噶尔盆地玛北地区三叠系百口泉组储层成岩相特征

通过岩芯观察、薄片鉴定、扫描电镜分析、测井和录井资料分析，对准噶尔盆地玛北地区三叠系百口泉组的储层特征和成岩作用特征进行了研究，结果表明该区主要发育砂砾岩、不等粒砾岩、含砾砂岩、细砂岩等，储层成分成熟度和结构成熟度均较低；储层主要经历了压实作用、胶结作用、溶蚀作用的改造，且泥质杂基含量对储层成岩作用及孔隙演化产生了较大的影响。在综合储层岩石学特征、成岩作用特征、泥质杂基含量对储层影响的基础上，建立了研究区成岩相划分方案，将砂砾岩储层划分为6个成岩相:高成熟强溶蚀相、高成熟中胶结中溶蚀相、高成熟强压实弱溶蚀相、高成熟强胶结相、低成熟强压实相、低成熟强胶结相；不同的成岩相反映了不同的沉积环境和成岩作用的关系，与储层的孔隙类型及物性条件存在着密切关系，具有不同的成岩序列特征、孔隙演化模式、剖面及平面展布特征，这种剖面和平面分布特征可为优质储层的预测提供借鉴。

Diagenetic Facies of Triassic Baikouquan Formation in Mabei Area,Jung-gar Basin

The reservoir characteristics and diagenesis of the Triassic Baikouquan Formation in the Mabei area,Jung-gar Basin,were studied based on data from core,thin sections,scanning electron microscopy,well logging and mud logging.The results show that the sediments of this area are mainly sandy conglomerate,unequal grain conglomerate, conglomerate sandstone and fine sandstone, and the structural maturity and compositional maturity of reservoir are generally low.The reservoirs mainly experienced compaction,cementation and dissolution,and the muddy matrix has a great influence on diagenesis and pore evolution.Based on the petrological characteristics,diagenesis and the influ-ence of muddy on the reservoir characteristics,the division of diagenetic facies of the study area is established,which include six parts:high maturity and strong dissolution facies,high maturity and moderately cemented dissolution faci-es,high maturity and strong compaction-weak dissolution facies,high maturity and strong cementation facies,low ma-turity and strong compaction facies, and low matureity and strong cementation facies.The different diagenetic facies reflect different depositional environments and diagenesis, which is related with pore type and physical properties of reservoir.Every kind of diagenetic facies has different characteristics of diagenetic sequence,pore evolution pattern, and profile and plane distribution characteristics,which could provide the basic knowledge for the prediction for high-quality reservoir.