三角洲前缘水下分流河道薄层单砂体成因类型及其叠置模式——以古城油田泌浅10区核三段Ⅳ-Ⅵ油组为例  

Genetic Types and Superimposition Patterns of Subaqueous Distributary Channel Thin Sandbodies in Delta Front: A case study from the Ⅳ-Ⅵ reservoir groups of H3 in Biqian 10 area of Gucheng oilfield

作　　者：任双坡 姚光庆[1,2] 毛文静[1,2] 

机构地区：[1]中国地质大学构造与油气资源教育部重点实验室,武汉430074 [2]中国地质大学资源学院,武汉430074

出　　处：《沉积学报》2016年第3期582-593,共12页Acta Sedimentologica Sinica

基　　金：中国石油化工股份有限公司河南油田分公司重点项目(31350053-13-ZC0607-0005)~~

摘　　要：泌阳凹陷古城油田泌浅10区核三段广泛发育三角洲前缘水下分流河道薄层砂体。在储层精细沉积微相研究的基础上,综合应用岩芯、密井网测井等资料,对古城水下分流河道单砂体进行了精细刻画,建立了单砂体规模定量预测模型。依据河道规模将古城水下分流河道分为Ⅰ型、Ⅱ型、Ⅲ型河道3类。运用高分辨率层序地层学短期基准面旋回原理,对研究层段水下分流河道砂体成因类型进行了研究。结果表明,在基准面低幅上升且A/S<<1时,形成削截式水下分流河道砂体;A/S<1(接近1)时,形成完整式水下分流河道砂体。识别出单一河道砂体的叠置类型主要包括垂向叠置、侧向叠置、垂向相切、侧向相切、垂向分隔5种垂向叠置模式以及间湾相隔式、水平搭接式、侧向切叠式3种平面接触样式,并总结了各自的测井相识别标志。Thin sandbodies of subaqueous distributary channels of delta-front are widely developed in Biqian 10 area, Gucheng oil field, Biyang sag. Depending on fine study of reservoir sedimentary microfacies with integrating various data including cores and small well spacing logging data, we characterized the single sand body identification in com- pound subaqueous distributary channels and established a quantitative prediction model for single sand body scale, then we classified the subaqueous distributary channels into 3 types according to channel scale. Based on the short- term base-level cycle theory of high resolution sequence stratigraphy, the paper analyzes the genesis of subaqueous distributary channel sandstones in the study area. The result shows that in the course of base-level rising, A/S〈〈 1, sandstone genetic type is mainly truncated distributary channel sandstone body, A/S〈 1 （close to 1 ） , sandstone genet- ic type is mainly integrated distributary channel sandstone body. We identified that there are five main vertical super- imposition patterns of single sandbodies, including vertical superposition, lateral superposition, vertical tangency, lat- eral tangency and vertical separated, and three lateral contact patterns, including interdistributary contact, horizontal overlap contact and lateral superimposition-tangency contact, moreover, each type of logging-facies marks is summa- rized.

关 键 词：泌浅10区 单砂体 短期基准面旋回 水下分流河道 三角洲前缘 

分 类 号：P618.13[天文地球—矿床学]