东北及邻区中生代盆地片钠铝石的分布、产状及其油气地质意义  

Distribution,Occurrence and Their Petroleum Significance of Dawsonite from Mesozoic Basins in Northeastern China and Adjacent Area

作　　者：刘立[1] 曲希玉[1] 董林森[1] 王小琴[1] 李福来[1] 

机构地区：[1]吉林大学地球科学学院,长春130061

出　　处：《吉林大学学报（地球科学版）》2009年第1期1-8,共8页Journal of Jilin University：Earth Science Edition

基　　金：国家自然科学基金项目(40672074;40372060);教育部高等学校博士学科点专项科研基金项目(20070183137)

摘　　要：东北及邻区中生代地层中的片钠铝石分布于海拉尔盆地、塔木察格盆地、二连盆地、开鲁盆地和阜新盆地的早白垩世地层及松辽盆地南部的早白垩世晚期—晚白垩世早期地层中。片钠铝石主要发育在油气储层或CO2气储层中富含长石的砂岩和火山碎屑岩中。在含片钠铝石砂岩和火山碎屑岩中,片钠铝石以放射状、束状、杂乱毛发状、球状和板状等集合体充填孔隙,或呈束状和板状交代长石和岩屑。片钠铝石及其共生的铁白云石都是最晚形成的自生矿物组合。越来越多的证据表明,片钠铝石是富CO2流体的指示矿物,记录了CO2和油气双重充注现象。在含片钠铝石碎屑岩中可以解读出CO2充注的时间和CO2分压的变化。Dawsonite of Mesozoic strata in Northeast China and adjacent area distribute in Lower Cretaceous strata from Hailaer basin, Tamtsag basin, Erlian basin, Kailu basin and Fuxin basin, and Upper part of Lower Cretaceous and Lower part of Upper Cretaceous from southern Songliao basin. Optical microscope, scanning electron microscope and X - ray diffraction analysis have revealed that dawsonite mainly occur in the feldspar-rich sandstone and pyroclastic rocks, either as cements filling intergrain pores as radical, bunchy, rosette, intricately trichoid, and platy collectives, or as replacement of feldspar and lithic grains with bunchy and paty shapes. More and more evidences suggest that dawsonite is a indicative mineral of CO2-rich fluids and record CO2 and petroleum dual infilling. The infilling time of CO2 and variation of partical pressure of CO2 during infilling process can be determined from dawsonite-bearing clastic rocks.

关 键 词：片钠铝石 分布 产状 石油地质意义 东北及邻区 

分 类 号：P618.13[天文地球—矿床学]