松辽盆地十屋断陷十屋地区营城组物源体系探讨  

Discussion on Provenance Systems in Yingcheng Formation in Shiwu Area of Shiwu Fault Depression,Songliao Basin

作　　者：操应长[1] 周磊[1] 张玉明[2] 陈孔全[2] 谢正霞[2] 

机构地区：[1]中国石油大学地球资源与信息学院,山东青岛266555 [2]中国石油化工股份有限公司东北油田分公司,长春130026

出　　处：《沉积学报》2011年第6期1096-1104,共9页Acta Sedimentologica Sinica

摘　　要：在综合分析碎屑颗粒组分、重矿物组合、砂砾岩展布和地层倾角测井等资料的基础上,探讨了十屋断陷十屋地区营城组沉积时期的物源体系特征和分布。碎屑颗粒组分和重矿物分析能指示物源区母岩类型和碎屑物质的搬运方向,砂砾岩展布能指明了碎屑物质的搬运方向和搬运途径,地层倾角测井则指示了古水流的方向。结果表明,十屋地区营城组存在三大物源体系,分别是西北方向以沉积岩和岩浆岩为母岩的西北物源体系、以岩浆岩为母岩的北部斜坡物源体系和以岩浆岩、变质岩为母岩的东部斜坡物源体系,三大物源体系共同控制了十屋地区营城组沉积时期砂体的形成和分布,并且形成了"多物源混源沉积、各物源源间存异、各时期继承发育"的沉积格局。Several provenances deposition is the result of mixed deposition of detrital materials that came from different provenances and different types of parent rocks.We may neglect the diversity of different provenances if we simply analyse the indexes that can indicate the characteristic of mother rock by calculating the average value.So we should classify the samples which belong to the same provenance at first,then analyze the direction and characteristics of every provenance. This article discussed the provenance system characteristics of Yingcheng Formation in Shiwu fault depression by comprehensive analysis of clastic grain combination,heavy minerals combination,sandy conglomerate distribution,dip logging and other materials.Clastic grain combination can indicate parent rock characteristics of the provenance area,and clastic grain maturation can help to distinguish the transportation direction of fragmentary material.The authors determined three kinds of provenances by classification of the same provenance for clastic grain combination materials of all wells in the study area.The samples of the first kind provenance have the characteristics of ＂ low quartz content,high feldspar and cuttings content,and magmatite is the main cuttings type＂;the samples of the second kind provenance have the characteristics of ＂ high quartz content,low cuttings content,and magmatite and metamorphic are the main cuttings types＂;the samples of the third kind provenance have the characteristics of ＂quartz,feldspar,and cuttings＇ contents are nealy the same,and sedimentary and magmatite rock are the main cuttings types＂.Then the three provenance directions above have been determined,and the result are northern provenance,eastern provenance,and northwest provenance respectively. Heavy minerals analysis is also one of the methods of study provenance direction and parent rock characteristics.Three heavy minerals combination areas have been identified by heavy minerals content statistics and combination classification of study

关 键 词：碎屑颗粒组分 重矿物 古水流 多物源分析 营城组 松辽盆地 

分 类 号：P512.2[天文地球—地质学]