高分辨率层序格架内储层砂体发育特征——以松辽北部州311地区泉三、泉四段为例  

Characteristics of reservoir sand bodies within high-resolution sequence framework: A case from the 3^(rd) and 4^(th) members of Quantou Formation in Zhou 311 area,northern Songliao Basin

作　　者：孙春燕[1,2,3] 胡明毅[1,2,3] 胡忠贵[1,2,3] 邓庆杰[1,2,3] 

机构地区：[1]长江大学沉积盆地研究中心,湖北武汉430100 [2]长江大学非常规油气湖北省协同创新中心,湖北武汉430100 [3]长江大学地球科学学院,湖北武汉430100

出　　处：《石油与天然气地质》2017年第6期1019-1031,共13页Oil & Gas Geology

基　　金：国家科技重大专项(2017ZX05013-006);湖北省创新群体基金项目(2015CFA024)

摘　　要：为了刻画松辽北部州311地区泉三、泉四段储层砂体沉积特征,为该区隐蔽性砂岩油气藏的勘探和开发提供新证据,以高分辨率层序地层学和储层沉积学理论体系为指导,结合岩心、测井曲线以及区域地震资料,识别出六种短期基准面旋回发育样式,建立层序地层划分方案,进而分析层序格架内储层砂体发育类型及特征。研究表明:泉三、泉四段内部可划分2个长期基准面旋回(Q3-LSC1—Q4-LSC1)、5个中期基准面旋回(Q3-MSC1—Q4-MSC3)、12个短期基准面旋回(Q3-SSC1—Q4-SSC7)。短期基准面旋回主要发育以上升半旋回为主的不对称型结构(A_1、A_2、A_3)、上升半旋回与下降半旋回接近相等的近完全-完全对称型结构(C2)、以上升半旋回或下降半旋回为主的不完全对称型结构(C1,C3)。泉三、泉四段垂向上表现为基准面上升—下降—上升的演变规律,发育分流河道—曲流河道—分流河道—水下分流河道纵向沉积演化序列,河道砂体发育样式从较少叠置到较多垂向或侧向叠置型,再逐渐过渡到孤立型。基于高分辨率层序地层划分和对比,在短期基准面旋回约束下,解剖曲流河道砂体、分流河道砂体、水下分流河道砂体沉积剖面及内部旋回结构特征,其中Q4-SSC1和Q3-SSC5沉积时期河道砂体普遍油浸,砂体连续沉积厚度相对较大,为最有利的砂体分布层位。由于储层内部存在复杂的非均质性,因此,进行河道砂体精细解剖势在必行。To provide more information for exploration and development of the subtle sandstone oil and gas reservoirs in Zhou 311 area of Northern Songliao Basin,it is necessary to describe the sedimentary characteristics of reservoir sand bodies in the 3^(rd) and 4^(th) members of Quantou Formation. Six short-term base-level cycles were identified under the guidance of high resolution sequence stratigraphy and reservoir sedimentology theories and through integration of core,logging and regional seismic data,and were used to establish a sequence stratigraphic division scheme. The types and characteristics of reservoir sand bodies were analyzed within the established sequence framework. The 3^(rd) and 4^(th) members of Quantou Formation can be divided into two long-term base-level cycles( Q3-LSC1-Q4-LSC1),five medium-term base-level cycles( Q3-MSC1-Q4-MSC3),and twelve short-term base-level cycles( Q3-SSC1-Q4-SSC7). The short-term baselevel cycles mainly develop asymmetric structure dominated by ascending half cycles( A_1、A_2、A_3),almost complete-complete symmetrical structure with ascending and descending half cycles being nearly equal( C2),incomplete symmetrical structure dominated by either ascending half cycles or descending half cycles( C1,C3). Vertically,the evolution of the 3^(rd) and 4^(th) members of Quantou Formation shows a pattern ofbase level rising,falling,and then rising. The vertical sedimentary evolution sequence is distributary channel-meandering channel-distributary channel-underwater distributary channel. The channel sand body types develop from less overlap to more vertical or lateral overlap,and then gradually change to isolated type. Characteristics of sedimentary section and internal sedimentary cycle structure of the meandering channel sand bodies,distributary channel sand bodies,underwater distributary channel sand bodies are analyzed on the basis of high-resolution sequence stratigraphy division and correlation and under the control of short-term base-level cycles. The sand bodies were mostly oi

关 键 词：河道砂体 基准面旋回 高分辨率层序地层 泉头组 州311地区 松辽盆地 

分 类 号：TE121.3[石油与天然气工程—油气勘探]