胜坨地区沙二段辫状河三角洲沉积特征  

Sedimentary characteristics of braided channel delta of the second member of Shahejie Formation in Shengtuo area

作　　者：牟汉生[1] 孙钰[2] 姜在兴[3] 

机构地区：[1]中科院广州地球化学所 [2]中国石油大学,山东东营257061 [3]中国地质大学,北京100083

出　　处：《特种油气藏》2007年第3期24-27,共4页Special Oil & Gas Reservoirs

摘　　要：胜坨地区沙二段发育辫状河三角洲沉积,沉积特征特殊。综合大量地质资料描述了辫状河三角洲的岩性、沉积构造、粒度及沉积序列等沉积特征。辫状河三角洲沉积的最显著特征是具有三层结构,由下而上依次发育前辫状河三角洲亚相、辫状河三角洲前缘亚相和辫状河三角洲平原亚相,呈明显的进积层序。辫状河三角洲主体为辫状河道、水下分流河道和辫状河三角洲前缘河口坝,常见多个河道砂体在纵向上相互叠置,沉积砂体的储集性能良好,油气富集。Braided channel delta had developed in the second member of Shahejie Formation in Shengtuo area,and has distinct characteristics significantly different from other deltas.The lithology,sedimentary structure,grain size and sedimentary sequence of the braided channel delta are described based on a great amount of geological data.The most notable feature of braided channel delta deposition is that it has three-layer structure,from bottom to top including prebraided channel delta subfacies,braided channel delta front subfacies and braided channel delta plain subfacies,showing obvious progradational sequence.The main body of the braided channel delta consist of braided channel,subaqueous distributary channel and mouth bar of braided channel delta front.It is often seen that multi braided channel sands vertically superimpose each other.This sedimentation has good reservoir property and rich oil and gas reserves.

关 键 词：辫状河三角洲 沉积特征 三层结构 沙二段 胜坨地区 

分 类 号：TE121.3[石油与天然气工程—油气勘探]