白豹地区长4+5段沉积微相特征  

Sedimentary Microfacies Characteristics of Chang 4+5 Member in Baibao Area

作　　者：周瑶[1] 罗乃菲 李延飞[1] 朱童[1] 张忠义[2] 刘鑫[2] 

机构地区：[1]成都理工大学能源学院,四川成都610059 [2]中国石油长庆油田分公司勘探开发研究院,陕西西安710021

出　　处：《天然气技术与经济》2014年第5期5-8,42,共5页Natural Gas Technology and Economy

基　　金：国家自然科学基金(41172119)

摘　　要：在前人研究的基础上从沉积特征、测井特征、粒度特征3个方面对白豹地区长4+5段沉积微相进行了识别划分并反映其整体的沉积环境。研究认为:白豹地区长4+5段主要分为三角洲前缘和前三角洲—滨浅湖2个亚相,其中包括河口坝、远砂坝、坝间、砂坪、泥坪、混合坪6个微相;区内河口坝大量发育,以中—厚层中细砂岩为主,分选好,GR曲线呈高—中幅漏斗形,纵向上呈多期河口坝叠置,为有利的储集相带;其次发育远砂坝砂岩,以粉细砂岩、粉砂岩为主,分选较好,GR曲线呈中—低幅漏斗形,为较有利的储集相带;砂坪、混合坪砂岩泥质含量高,以粉砂岩泥粉砂岩为主,GR曲线呈锯齿形、高—中幅指形;坝间、泥坪主要为泥岩,GR呈低平形和微齿形;粒度参数特征和C-M图解表明白豹地区长4+5段沉积物粒度普遍偏细,以跳跃质为主体,分选较好,反映出其整体水动力较稳定的特征。The sedimentary microfacies of Chang 4+5 Member in Baibao area was identified and classified in terms of its depositional, well- logging, and particle- size properties, reflecting an overall sedimentary setting. Results show that(1)for the member,there are mainly two subfacies of deltaic front, and front delta and shore- shallow lacustrine along with six microfacies of mouth bar,distal bar, between-the-bar, sand flat, mud flat, and mixed flat(;2)in the study area, the mouth bar which is the most developed and belongs to a more favorable facies belt, is mainly composed of middle to fine sandstone with moderate to thick thickness and good sorting. Its GR curve appears a funnel shape with high to middle amplitude. Longitudinally, multiphase mouth bar sandstone is superimposed(;3)the distal bar, also a favorable facies belt, is developed and dominated by fine sandstone and siltstone with good sorting. Its GR curve forms the funnel shape with middle to low amplitude;(4)in both sand flat and mixed flat which are dominated by siltstone and muddy siltstone, a large amount of shale content can be found. And their GR curve presents zigzag shape or high to middle amplitude finger in shape; and(5)both between-the-bar and mud flat are dominated by mudstone, and their GR curve appears flattened and zigzag shape. In addition, the size property and C-M graph all illustrate that in the Chang 4+5 Member, the particle size is often fine and characterized by good sorting, which reflects a character of more stable hydraulic force.

关 键 词：白豹地区长4+5段沉积微相 测井粒度 

分 类 号：P618.13[天文地球—矿床学]