准噶尔盆地吉木萨尔凹陷二叠系梧桐沟组成岩作用及其对储层质量的影响

摘要

Through the data of cores, casting slides and scanning electron microscope, the authors study the diagenesis of Perman Wutonggou Formation in Jimusar sag of Junggar Basin. The results show that the reservoir dia-genesis in Wutonggou Formation are compaction, cementation and denudation, in which the compaction and cementation are the main diagenesis to control reservoir quality. The compaction which make reservoir porosity decreasing is mechanical compaction; the main cementation is calcite or ferrocalcite cementation, secondly is secondary clay minerals cementation, which is the key factor of permeability reduce; the denudation is mainly the feldspar particles denudation with limited improvement to reservoir physical property, which is not leads to secondary porosity development zone.%通过岩心、铸体薄片以及扫描电镜等数据,对准噶尔盆地吉木萨尔凹陷二叠系梧桐沟组储层成岩作用进行了研究.结果显示:梧桐沟组储层经历了压实、胶结和溶蚀等多种成岩作用,其中压实作用和胶结作用是控制储层物性的主要成岩作用.压实作用主要是机械压实,是孔隙减少的主要原因；胶结作用主要是(铁)方解石的胶结,其次是各种次生黏土矿物的胶结,是渗透率减少的关键因素；溶蚀作用主要是长石颗粒的溶蚀,对储层物性改善有限,并没有出现次生孔隙发育带.