摘要
准噶尔盆地腹部地区下侏罗统三工河组储集层以岩屑砂岩为主 ,具有成分成熟度中等、结构成熟度高和填隙物含量低的岩石学特征 ,孔隙类型以剩余原生粒间孔为主 ,其次为颗粒溶孔。与八道湾组、西山窑组储集层相比 ,在同等条件下三工河组储集层具有更好的储集性能。认为其原因在于 :三工河组主要储集砂体形成于水动力条件强的高能环境 ,砂体厚度大、粒度较粗、分选好及塑性岩屑含量低 ,有利于形成较高原生孔隙 ;在研究区大部分地区为水下分流河道、河口坝及滩坝亚相等粗结构砂岩 ,结构成熟度高 ,硅质胶结在成岩早期发生 ,增加了岩石抵抗压实作用的能力 ,有利于粒间孔的保存。图 3表 1参
The clastic reservoirs of Sangonghe Formation, Lower Jurassic in central Junggar basin mainly consist of lithic sandstone, whi ch is characterized by 'two high and one low'(higher compositional maturity, h igher textual maturity and lower interstitial matter content). With increasing b urial depth, sandstone progressively loses porosity. Porosity was decreased main ly due to compaction and quartz cemen tation, but, at the same time, cements also protected grains from further compac tion. The quartz cementation is slight and dissolution is not obvious. The clast ic rocks are at late diagenesis stage (A1), all these make it possible that pore s types are mainly characterized by residual intergranular pores and partially b y intragranular solution pores. Middle compositional maturity, higher textual ma turity and lower interstitial matter content are the primary causes resulting in favorable physical properties of the reservoirs. It was also pointed out that s ubaqueous distributary channels, river mouth bars and beach bars, which are coar se and have lower interstitial matter content, are favorable for development of the reservoirs.
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
2001年第6期34-37,共4页
Petroleum Exploration and Development
关键词
准噶尔盆地
侏罗系
三工河组
储集层
成因
油气勘探
Junggar basin, Lower Jurr assic, Lithic sandstone, Reservior characteristic, Origin
