【摘要】 为对川中东北部地区须家河组进行储层评价和勘探预测,对储层段成岩作用以及孔隙演化的影响进行了研究,发现该区上三叠统须家河组储集岩砂体主要以岩屑石英砂岩、长石岩屑砂岩、岩屑长石砂岩为主,成岩过程经历了压实、胶结、交代、溶蚀和自生矿物形成等多种成岩作用,其中压实、交代作用和部分自生矿物形成对优质储层的形成起主要的破坏作用,而对溶蚀和环边绿泥石胶结物的形成起建设性作用;储层成岩过程划分为早成岩、中成岩和晚成岩阶段,其中早、中成岩阶段又分为A、B两个次级阶段;溶蚀作用增加了次生孔隙数量,提高了储层孔隙度,环边绿泥石胶结物的存在使得大量的原生粒间孔隙得以保存,且主要集中在须二段储层中。更多还原

【Abstract】 In this paper,the effect of diagenesis on pore evolution of Xujiahe Formation,northeastern Central Sichuan Basin,is studied.It is found that the upper Tertiary Xujiahe reservoir is mainly composed of lithic quartz sandstone,feldspathic lithic sandstone and clastic feldspathic sandstone.And it experienced plenty of diagenesis including compaction,cementation,metasomasis,dissolution and authigenic mineral’s formation.Among them,the compaction,metasomasis and authigenic mineral’s formation are dominantly damage to high-quality reservoir formation whereas dissolution and marginal chlorite cement’s formation are constructive.Diagenesis can be classified into early,middle and late diagenesis;and early and middle diagenesis can also be divided into A and B subdiagenesis.In addition,dissolution may increase either secondary-pore quantity or reservoir porosity.A lot of primary intergranular pores will be remained mainly in Xujiahe 2 Member because of marginal chlorite cement.更多还原