罗家地区水下冲积扇与垦西地区扇三角洲沉积特征及沉积模式对比  

Comparison of sedimentary characteristics and sedimentary model between subaqueous alluvial fan and fan delta in Luojiaand Kenxiarea

作　　者：肖莉[1] 

机构地区：[1]中国石化胜利油田分公司地质科学研究院,山东东营257015

出　　处：《油气地质与采收率》2014年第3期36-40,113,共5页Petroleum Geology and Recovery Efficiency

基　　金：国家科技重大专项"渤海湾盆地精细勘探关键技术"课题三"济阳坳陷油气富集机制与增储领域"(2011ZX05006-003)

摘　　要：通过分析岩心、测井和薄片等资料,对具有丰富稠油资源的罗家地区和垦西地区沙河街组砂砾岩体的沉积学特征进行研究,确定其砂砾岩体分别为水下冲积扇和扇三角洲沉积。罗家地区水下冲积扇沉积发育于坡度较大、湖水较深的古地貌背景,为重力流驱动,主要发育砾岩,以粗杂基支撑、混合支撑结构类型为主,粒度概率累积曲线主要为一段式,以发育向上变细的正旋回相序为特征。垦西地区扇三角洲沉积为受边界断层控制、发育于湖水较浅的缓坡型沉积背景,具有重力流和牵引流的双重水流机制,主要发育含砾砂岩,以颗粒支撑结构类型为主,粒度概率累积曲线以两段式和三段式为主,以发育向上变粗的反旋回相序为特征。罗家地区水下冲积扇与垦西地区扇三角洲沉积具有不同的沉积模式,导致其砂砾岩体的储集性能、含油性以及开采过程中流体的活动特征等存在较大差异。The conglomerate reserves abundant heavy oil in Luojia and Kenxi area, Bonan sub-sag. By analyzing drilling, logging andkinds of analytical data in detail, their sedimentary characteristics are studied herein. The study shows that, the conglomerates are sub-aqueous alluvial fan and fan delta. The subaqueous alluvial fan in Luojia area is developed in a background of ancient landform, anddriven by gravity flow. The conglomerate is developed within it primarily, and its structure type mainly contains coarse complex matrixand mixed matrix. Its probability cumulative grain-size curves are mainly one-part form. The fining-upward normal-cycle phase se-quence is developed. The fan delta in Kenxi area is developed in a background of shallow-lake flat slope sediments and controlled bythe boundary fault, it has a dual-flow mechanism of gravity flow and tractive flow, and the pebbly sandstone is developed within it pri-marily, and its structure type mainly contains supported grain. Its probability cumulative grain-size curves are mainly two-part formand three-part form. The coarsening-upward inverse-cycle phase sequence is developed. Their reservoir capabilities, oil saturationand fluid kinematical character during exploitation have large discrepancy, and it is the different sedimentary model that have con-trolled theabove discrepancy in fan delta ofLuojia area and subaqueousalluvial fanof Kenxi area.

关 键 词：砂砾岩体 水下冲积扇 扇三角洲 沉积特征 罗家地区 垦西地区 

分 类 号：TE111.3[石油与天然气工程—油气勘探]