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柴达木盆地西部地区古近纪与新近纪沉积相
引用本文:党玉琪,尹成明,赵东升.柴达木盆地西部地区古近纪与新近纪沉积相[J].古地理学报,2004,6(3):297-306.
作者姓名:党玉琪  尹成明  赵东升
作者单位:1.石油大学 北京 102249;2.中国石油青海油田分公司 甘肃敦煌 736202
摘    要:利用数十口井的电性、岩性及分析化验资料,将柴达木盆地西部地区古近纪与新近纪沉积相划分为七种相和亚相:洪积锥、水下冲积扇、河道和泛滥平原、滨湖、浅湖、较深湖和三角洲。沉积相的空间展布概括起来分为三大带:(1)阿尔金山前西段陡坡带洪积锥-水下冲积扇-扇三角洲-河道和泛滥平原-湖相 (2)阿尔金山前中段陡坡带洪积锥-水下冲积扇-湖相;(3)昆仑山前洪积锥-河道和泛滥平原-三角洲相。沉积相不仅影响着碎屑岩的成分和结构,而且也影响其物性与含油性。由洪积锥到水下冲积扇,到河道和泛滥平原,到三角洲,到湖相,石英和胶结物含量逐渐升高,岩屑和杂基含量逐渐降低,分选及磨圆变好,颗粒的粒级变细。浅层以河道和泛滥平原及三角洲相的物性最好,深层以三角洲相的物性最好,次为冲积扇,湖相最差。碎屑岩的油气富集以河道、泛滥平原和三角洲相最好,滨浅湖相油气富集最差。

关 键 词:柴达木盆地  古近纪  新近纪  沉积相
文章编号:1671-1505(2004)03-0297-10
修稿时间:2003年7月30日

Sedimentary facies of the Paleogene and Neogene in western Qaidam Basin
Dang Yuqi , Yin Chengming Zhao Dongsheng University of Petroleum,Beijing Qinghai Oilfield Company,Dunhuang ,Gansu.Sedimentary facies of the Paleogene and Neogene in western Qaidam Basin[J].Journal of Palaeogeography,2004,6(3):297-306.
Authors:Dang Yuqi  Yin Chengming Zhao Dongsheng University of Petroleum  Beijing Qinghai Oilfield Company  Dunhuang  Gansu
Institution:1.University of Petroleum  Beijing 102249;2.Qinghai Oilfield Company  Dunhuang 736202  Gansu
Abstract:The Neogene and Paleogene sedimentary facies and microfacies in western Qaidam Basin were divided into seven types as follows: pluvial,subaqueous alluvial fan,fluvial channels and flood plain,shore lake,shallow lake,relatively deep lake and delta based on well data of logging,lithology and testing analyses.Types and distribution of sedimentary facies are divided into three zones: (1) pluvial alluvial fan fan delta fluvial channels and flood plain lake facies in the steep zone of western Altun mountain front; (2) pluvial alluvial fan lake facies in the steep zone of middle Altun Mountain front; (3) pluvial fluvial channels and flood plain delta in the zone of Kunlun Mountain front Sedimentary facies not only influence composition and texture of clastic rock,but also porosity and permeability and hydrocarbon accumulation of clastic rock The content of stable quartz and cement increases,the content of fragment and matrix decreases from pluvial,subaqueous alluvial fan,fluvial channels and flood plain,delta to lake facies,the sorting and roundness of grain get better and better,size of grain gets finer and finer Porosity and permeability of fluvial and delta clastic rocks are best in the shallow buried strata of the west Qaidam Basin In the deeply buried strata,porosity and permeability of deltaic clastic rocks are the best,those of alluvial clastic rocks are the second,and those of lacustrine clastic rocks are the worst Hydrocarbon accumulation is richest in fluvial and deltaic clastic rocks,and is relatively poor in the deeply buried strata
Keywords:Qaidam Basin  Paleogene  Neogene  sedimentary facies  hydrocarbon accumulation
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