利用成像测井资料分析砂砾岩沉积特征——以徐家围子断陷安达地区下白垩统沙河子组为例  

Using FMI Data to Analysis the Sedimentary Characteristics of Glutenite: A case study from the lower Cretaceous Shahezi Formation in the Anda area,Xujiaweizi fault depression,NE China

作　　者：张大智[1] 初丽兰[1] 王晓莲[1] ZHANG DaZhi;CHU LiLan;WANG XiaoLian(Research Institute of Exploration and Development,PetroChina Oilfield Company Ltd.,Daqing,Heilongjiang 163712,China)

机构地区：[1]中国石油大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712

出　　处：《沉积学报》2018年第3期584-595,共12页Acta Sedimentologica Sinica

基　　金：国家科技重大专项(2016ZX05047-001);中国石油科技重大专项(2016E-0203)~~

摘　　要：以徐家围子断陷安达地区下白垩统沙河子组层序4砂砾岩为研究对象,利用相对丰富的成像测井资料,划分了单井砂砾岩体的沉积旋回及沉积微相,结合古水流及地震属性,明确了它们的沉积特征。结果表明:利用岩芯标定成像,明确沙河子组以粗碎屑沉积为主;砾岩磨圆、分选中等—较差,成像为亮色斑状;砂岩多为浅灰色、灰色中砂岩、细砂岩,成像为明亮色条带状。发育交错层理、递变层理等多种层理类型和球枕构造、负荷构造、滑塌构造等多种变形构造。以不同岩性、沉积构造、沉积相类型成像分析为基础,建立了高精度的岩性、粒度、磨圆、分选等参数纵向变化序列图,明确研究区发育扇三角洲、辫状河三角洲、湖泊、近岸水下扇等4种沉积相类型。安达地区层序4可划分为3个四级层序,不同四级层序古水流方向及沉积相平面分布存在差异,整体上具有陡坡带以扇三角洲为主、局部发育近岸水下扇、缓坡带发育辫状河三角洲的沉积相平面展布特征。在河道砂体与湖相泥岩指状交互的前缘位置,源—储叠置发育,成藏要素匹配较好,是有利的勘探目标区。The research object of this paper is to classify sedimentray cycles and facies of single well sandy conglomer-ate bodies as the glutenite of SQ4 of the Lower Cretaceous Shahezi Formation in Anda area, the Xujiaweizi fault de-pression, based on abundant imaging well logging data. According to paleocurrent features and seismic attribution, thesedimentary characteristics are identified for the study area. The resaults showed that the sediments of Shahezi Forma-tion were mainly composed of coarse clastic rocks according to the imaging well logging calibration through the coredata. Conglomerate has a middle-poor sorting and rounding and shows bright splashes shape on FMI. Sandstone mostlyreveals light grey and grey, the medium and fine sandstone and mostly reveal shining ribbon on FMI. They developedcrossing bedding, graded bedding and other bedding types. And various deformation structures such as ball-and-pillowstructure, load structure, slump structure are also developed Based on these FMI data of different lithology, differentsedimentary structure and different sedimentary facies, the sequence map with high-accuracy is built up, in which theparameters change vertically, such as the lithology, grain size, rounding, sorting and so on. Four sedimentary faciesdeveloped such as fan delta, braided delta, lake and nearshore subaqueous fan. Sequence 4 is divided into threefourth-order sequences in Anda area. Palaeocurrent direction and distribution of sedimentary facies has a little differ-ence in different fourth-order sequences. As a whole, fan deltas was mainly facies type, nearshore subaqueous fanspartly developed in steep slope zone and braided delta developed in gentle slope zone. The front area with channelsandstone and lake mudstone shows a finger interaction, developed an overlay of source rock and reservoir rock, andthe reservoir forming element matched well, all of which make this area as a favorable exploration area.

关 键 词：成像测井 沉积特征 徐家围子断陷 沙河子组 砂砾岩 古水流方向 

分 类 号：P588.212[天文地球—岩石学]