东营凹陷东营三角洲沙三段中亚段古地貌特征及其对沉积的控制  

Paleogeomorphology of the middle part of 3rd member of Shahejie formation and their effects on depositional systems, Dongying delta, Dongying depression

作　　者：刘军锷[1,2] 简晓玲[3] 康波[1] 苏明[4] 杜学斌[1] 

机构地区：[1]中国地质大学(武汉)资源学院,湖北武汉430074 [2]中国石化胜利油田分公司地质科学研究院,山东东营257015 [3]广州海洋地质调查局,广东广州510760 [4]中国科学院广州能源研究所,广东广州510640

出　　处：《油气地质与采收率》2014年第1期20-23,112,共4页Petroleum Geology and Recovery Efficiency

基　　金：国家油气重大专项"渤海湾盆地东营凹陷勘探成熟区精细评价示范工程"(2008ZX05051)

摘　　要：东营凹陷沙三段中亚段发育9期特征明显的三角洲进积单元,古地貌对三角洲进积单元的控制作用明显。利用东营凹陷丰富的钻井和高精度三维地震数据,采用适用于该区的定量高精度古地貌恢复方法——滨线轨迹法,来重建研究区9期三角洲进积单元的古地貌特征,并揭示古地貌对沉积的控制作用。研究结果表明,东营三角洲在沙三段中亚段沉积时期古地貌整体呈现南缓北陡、斜坡向西迁移的特征。沉积体的分布范围和沉积样式与古地貌特征具有良好的耦合关系:三角洲沉积主要沿着东部和东南部凸起逐渐向湖盆推进,受物源供给能力和古地貌特征的影响,三角洲朵体沿斜坡向西延伸;深洼区主要发育半深湖—深湖相沉积,在坡度较大的斜坡前端沉积物易发生失稳而形成浊积砂体。There are 9 obvious characteristics of delta progradation units developed in the middle part of 3rd member of Shahejie forma-tion in Dongying depression, and the Dongying delta is shaped in wedge-S type and gradually prograded into the center of the depres-sion, and the feature of progradation stage is remarkable. Based on abundant drilling data and high precision 3D seismic data, thisstudy used a special method in this area to recover the paleo-geomorphology with quantification and high precision shoreline trajectorymethod, aiming at reconstructing the paleogeomorphology of the nine delta progradation units and revealing the controlling on sedimen-tation. The results show that, the overall paleogeomorphology characteristics of the middle part of 3rd member of Shahejie formation isgentle south and steep north, and the slope migrates westwards. Distribution and depositional style of sedimentary deposit are coupledwell with paleogeomorphology: the delta deposit is mainly prograded gradually along the eastern and southeastern uplifts until the ba-sin, which is affected by the source supply capacity and paleogeomorphology, the delta lobe extends westward along the slope; while inthe deep depression area, the sedimentary facies is mainly consisted of semi-deep and deep lacustrine deposits. The sediment in thesteeper slope front is prone to be instable and thus forming the turbidite sand body.

关 键 词：古地貌特征 三角洲进积单元 沙三段中亚段 东营三角洲 东营凹陷 

分 类 号：TE111.3[石油与天然气工程—油气勘探]