渤海湾盆地歧口18-1油田沙二段层序地层及沉积相研究  

Study on sequence stratigraphy and sedimentary facies for the second member of Shahejie Formation of Qikou 18-1 Oilfield,Bohai Bay Basin

作　　者：尹楠鑫[1,2] 李中超[2] 国殿斌[2] 何康 孙廷彬[1,2] 罗波波[2] 程瑞英[2] 张玲[2] 

机构地区：[1]中原油田博士后工作站,河南濮阳457001 [2]中原油田勘探开发科学研究院,河南濮阳457001 [3]中海油天津分公司勘探开发研究院,天津300452

出　　处：《西北大学学报（自然科学版）》2015年第2期266-274,282,共10页Journal of Northwest University（Natural Science Edition）

基　　金：国家重大科技专项基金资助项目(2011ZX05001)

摘　　要：应用经典层序地层学理论进行歧口18-1油田层序地层格架和有利储集相带分布的预测,为油田开发方案的制定提供地质依据。通过不整合面、首次湖泛面和最大湖泛面的特征识别,在三级层序内部划分出低位、湖侵、高位3个体系域,建立了歧口18-1油田沙二段的层序地层格架;以体系域为单元进行沉积相分异及其演化过程的研究,预测了有利的沉积相带及储集砂体的空间分布。结果表明,歧口18-1油田沙二段发育扇三角洲—湖泊沉积体系,其有利的储集相带为低位体系域和高位体系域的扇三角洲水下分流河道,平面上多期河道叠加,储层物性好,是油田最为有利的开发目标。Based on the classic theory of Sequence Stratigraphy, the paper studies the sequence stratigraphic framework of Qikou 18-10ilfield and predicts the distribution of favorable reservoir facies belts, which can provide a geological basis for oilfield development planning. Through recognition of unconformity surfaces, first flooding surfaces and maximum flooding surfaces, the paper divides the third-order sequence into three system tracts, that is, lowstand system tract, transgressive system tract and highstand system tract and hence establi- shes the sequence stratigraphic framework for the second member of Shahejie Formation of Qikou 18-10ilfield. Subsequently, facies differentiation and evolution within each system tract of the framework is studied so as to predict the spatial distribution of favorable facies belts and sand bodies. The second member of Shahejie Formation of Qikou 18-10ilfield was deposited in a fan delta-lacustrine sedimentary system, the distribution range of favorable facies belts of each system tract was mapped and the spatial distribution of high-quality sandstone bodies was predicted. The distributary channels of fan delta within lowstand and highstand system tract, which overlay in space and possess excellent physical properties, are advantageous facies of the second member of Shahejie Formation in Qikou 18-10ilfield and make it the most favorable development targets for the oilfield.

关 键 词：歧口凹陷 沙河街组 层序地层 沉积微相 扇三角洲 

分 类 号：P539.2[天文地球—古生物学与地层学]