松辽盆地新立—新北地区嫩江组三段浅水三角洲水下分流河道砂体半定量解剖  

Semi-quantitative Research on Subaqueous Distributary Channel Sandbodies of the 3th Member of Nenjiang Formation in Xinli-Xinbei Area,Songliao Basin

作　　者：赵宝峰[1] 王家豪[1,2] 徐东浩[1] 徐蒙[1] 金小梅[1] 

机构地区：[1]中国地质大学资源学院,武汉430074 [2]中国地质大学构造与油气资源教育部重点实验室,武汉430074

出　　处：《沉积学报》2012年第3期511-521,共11页Acta Sedimentologica Sinica

摘　　要：利用松辽盆地新立—新北地区井间距约200 m的1800余口探井及开发井资料,在岩性观察和测井相识别的基础上,编制嫩江组三段I砂组砂岩等厚图和连井剖面图。对砂体进行半定量统计分析发现,目的层段为浅水三角洲前缘沉积,水下分流河道砂体是最主要的骨架砂体类型,在平面上延伸20 km以上,向三角洲前缘末端演化出3种类型:水下曲流河道砂体,呈长豆荚状,宽600～900 m,延伸8～10 km分叉;水下分汊河道砂体,呈短豆荚状,分叉呈"人"字形或菱形,宽500～900 m,延伸2～3 km分叉;水下网结河道砂体,分叉呈网状展布,宽300～500 m,直线延伸0.5～1 km分叉。With the application of well data from 1 800 exploration and development wells with the inter distance of 200 m,identification of lithology and analysis of logging facies,we compile sand thickness map and joint wells section of sand body in sand-unitⅠ,third segment of Nengjiang Formation.By the semi-quantitative analyses on sand bodies,we find that the interval of interest is deposited as the shallow-water deltas front and the main kind of sand body is subaqueous distributary channel deposition,witch extends over 20 km and evolves into three types processing to the end of delta front： the sand body of meandering channel,which is characterized as long pod,with the width from 600 m to 900 m,and branch off after stretched 8-10 km;the sand body of branching channel,which is characterized as short pad,with the width from 500 m to 900 m,and branch off after stretched 2-3 km,distribute as the symbol of ＇人＇or rhombus-shaped;the sand body of reticulate channel,which is distribute as nets,with the width from 300 m to 500 m,and branch off after stretched 0.5-1 km.The evolution of subaqueous distributary channel sand body associated with the change of superimposed styles and microfacies.The former changed from vertical superposition to dislocated superposition to dislocated-level composited superposition to levelly related joint to isolated dispersion;the latter changed from crevasse channel to inter-channel deposits to mouth bar.All of the above association are the result of gentle sedimentary basement,rich sediment supply,steadily falling lake level,stable subsea natural barrier and the energy transformation between rivers and lakes.

关 键 词：松辽盆地 嫩江组 浅水三角洲 水下分流河道 密集井网 

分 类 号：P512.2[天文地球—地质学]