吐哈盆地温吉桑构造带中侏罗统砂岩成岩作用对储层储集性的影响  

THE ENFLUENCE OF MIDDLE JURASSIC SANDSTONE DIAGENESES ON THE STORAGE CAPACITY OF RESERVOIRS IN WENGJIESIIANG STRUCTURAL BELT OF TUHA BASIN

作　　者：徐世琦[1] 

机构地区：[1]四川石油管理局地质勘探开发研究院

出　　处：《天然气工业》1996年第2期16-18,共3页Natural Gas Industry

摘　　要：吐哈盆地温吉桑构造带中侏罗统三间房组砂岩储层以岩屑砂岩和长石岩屑砂岩为主,岩屑成分以火成岩岩屑占优。这些储层在沉积成岩过程中,压实作用、胶结作用和充填作用极大地影响了孔隙发育;而强烈的溶蚀作用则有利于次生孔隙的形成。次生孔隙以粒间溶孔、粒内溶孔和杂基孔为主,偶见少量残余原生粒间孔。成岩作用过程中有利于溶蚀作用发育的主要因素有:砂岩颗粒直径较大、杂基含量少、灰质胶结物多、矿物的碎裂、火成岩岩屑发育和有机酸的作用等。通过对沉积成岩作用的综合分析认为,三间房组第二段是该区的Ⅰ级主力油气层段,第四段为Ⅲ级油气层段,第三段则为差油气层段。The Middle Jurassic J_2s sandstone reservoirs in Wengjieshang structural belt of Tuha Basin are mainly composed by lithic sandstone and feldspathic litharenite. In the process of sedimentation and diagenesis of the reservoirs,the compaction,cementation and packing action greatly effect the development of pores,however,the intensive eorrasion can help the forming of secondary pores. Secondary pores mainly show as intergranular dissolved pore,matrix pores,and some residual primary intergranular pores. In the diagenesis process ,the factors that are in favour of the development of eorrasion are :the large diameter of sand grain,less matrix content,more lime-cemented materials,cataclasis of minerals ,development of igneous debris and the action of organic acid. The following conclusions from the analysis of the sedimentation and diageneses are:the J_2s^2 is the first order hydrocarbon zone ;J_2~4 is the third order hydrocarbon zone, and J_2s^3 is the worst.

关 键 词：温吉桑油田 中侏罗世 砂岩 储集层 成岩作用 

分 类 号：P618.130.2[天文地球—矿床学]