辽河油田西部凹陷东营组四级层序下沉积体系特征
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摘要
辽河油田西部凹陷东营组成藏条件优越,但传统东营组地质分层难以提高勘探精度,同时东营组沉积条件复杂、沉积类型多样造成储层预测困难,制约了东营组油气藏的勘探发现。依据层序地层学和沉积学研究方法,对西部凹陷东营组四级层序地层格架内的沉积体系的特征、空间展布和演化规律进行了分析。研究表明:东营组为陆相—湖相复合沉积环境,古地貌、古物源和古环境控制了东营组沉积类型和展布;东营组可识别出冲积扇、河流、三角洲、湖泊4大类沉积体系和冲积扇、曲流河、辫状河、曲流河三角洲、辫状河三角洲、扇三角洲、滨浅湖滩坝7类沉积相;东营组可划分为4个四级层序,在四级层序等时格架下,东营组沉积体系展布呈现"南北分区,东西分带"的特点,整体形成冲积扇—河流—三角洲沉积体系组合,沉积体系演化具有纵向上由多样转换为单一、横向上由分化转换为统一的特点。
Although the accumulating conditions of Dongying Formation reservoir are favorable in West Sag of Liaohe Oilfield,the traditional geological stratification of Dongying Formation is difficult to improve the exploration precision. At the same time,the complicated sedimentary conditions and various sedimentary types of Dongying Formation make the reservoir prediction difficult,thus the exploration and discovery of Dongying Formation oil and gas reservoir are restricted. With the help of the methods of the sequence stratigraphy and sedimentology,the characteristics,spatial distribution and evolutionary laws of the sedimentary system in the fourth-order sequence stratigraphic framework of Dongying Formation in West Sag are analyzed. The researches show that Dongying Formation belongs to continental-lacustrine sedimentary combined environments,and the paleogeomorphology,palaeo-source/antiquities and paleoenvironment control the sedimentary type and distribution of Dongying Formation; Four types of thesedimentary system,including the alluvial fan,river,delta and lake,can be identified in Dongying Formation,and moreover there exist seven types of the sedimentary facies i. e. the alluvial fan,meandering river,braided river,meandering river delta,braided river delta,fan delta and shore-shallow lake beach dam; Dongying Formation can be divided into four fourth-order sequences,under the fourth-order sequence isochronous frame,the sedimentary system of Dongying Formation presents the characteristics of " North-south subdivision,east-west zonation" and forms the alluvial fan-fluvial-delta sedimentary system assemblage as a whole,the evolution of the sedimentary system is characterized by the vertical transformation from diversity to singleness and horizontal transformation from differentiation to unification.
Although the accumulating conditions of Dongying Formation reservoir are favorable in West Sag of Liaohe Oilfield,the traditional geological stratification of Dongying Formation is difficult to improve the exploration precision. At the same time,the complicated sedimentary conditions and various sedimentary types of Dongying Formation make the reservoir prediction difficult,thus the exploration and discovery of Dongying Formation oil and gas reservoir are restricted. With the help of the methods of the sequence stratigraphy and sedimentology,the characteristics,spatial distribution and evolutionary laws of the sedimentary system in the fourth-order sequence stratigraphic framework of Dongying Formation in West Sag are analyzed. The researches show that Dongying Formation belongs to continental-lacustrine sedimentary combined environments,and the paleogeomorphology,palaeo-source/antiquities and paleoenvironment control the sedimentary type and distribution of Dongying Formation; Four types of thesedimentary system,including the alluvial fan,river,delta and lake,can be identified in Dongying Formation,and moreover there exist seven types of the sedimentary facies i. e. the alluvial fan,meandering river,braided river,meandering river delta,braided river delta,fan delta and shore-shallow lake beach dam; Dongying Formation can be divided into four fourth-order sequences,under the fourth-order sequence isochronous frame,the sedimentary system of Dongying Formation presents the characteristics of " North-south subdivision,east-west zonation" and forms the alluvial fan-fluvial-delta sedimentary system assemblage as a whole,the evolution of the sedimentary system is characterized by the vertical transformation from diversity to singleness and horizontal transformation from differentiation to unification.
引文
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[19]张凤莲,单俊峰,吴兴录,等.辽河滩海地区古近系层序地层特征及控砂、控藏作用[J].现代地质,2012,26(3):561-568.
[20]王鸿军.古龙南地区葡萄花油层高分辨率层序地层学研究[J].大庆石油地质与开发,2015,34(5):38-44.
[21]姜在兴.沉积体系及层序地层学研究现状及发展趋势[J].石油与天然气地质,2010,31(5):535-541.
[22]李建平,杨波,周心怀,等.渤中凹陷东营组层序地层及其沉积相分析[J].东北石油大学学报,2012,36(4):1-9.
[2]陈正乐,马寅生,王小凤,等.辽河盆地新生代构造演化模式[J].地质力学学报,1999,3(2):83-89.
[3]谢玉华,朱筱敏,赵坤.辽河西部凹陷古近系层序地层格架[J].科技导报,2010,28(6):58-64.
[4]朱正平,潘仁芳,李鹏,等.渤海庙北地区东营组上段沉积体系与控制因素分析[J].石油天然气学报,2011,35(11):35-39.
[5]孟卫工.辽河盆地滩海地区东营组沉积特征与演化[J].石油与天然气地质,2010,31(5):567-575.
[6]刘超,姜在兴,陈骥.青海湖北部冲积扇沉积特征、演化过程及控制因素[J].油气地质与采收率,2017,24(5):1-9.
[7]朱筱敏,刘泽容,信荃麟,等.东濮凹陷黄河南地区东营组沉积相研究[J].石油大学学报(自然科学版),1990,14(4):1-10.
[8]吴光华,王红亮,林会喜,等.渤海湾盆地埕岛地区东营组沉积特征及其油气地质意义[J].石油与天然气地质,2009,30(1):33-40.
[9]李一赫,尚尧,张顺,等.多物源复合式浅水三角洲沉积特征与沉积模式[J].大庆石油地质与开发,2016,35(3):1-9.
[10]樊奇,黄铭志,樊太亮,等.松辽盆地民东地区地层划分及沉积环境[J].大庆石油地质与开发,2017,36(2):45-51.
[11]乔向阳,朱晴,孙建峰.高家河地区盒8段地层地震-沉积响应特征研究[J].特种油气藏,2017,24(5):32-36.
[12]郑超,赵漾,韩京,等.湖相—浅水扇三角洲叠置砂体沉积模式[J].大庆石油地质与开发,2017,36(5):56-61.
[13]刘慧盈,高志前,吴俊,等.扇三角洲前缘单一河道砂体识别与定量表征[J].大庆石油地质与开发,2017,36(1):17-21.
[14]瞿雪姣,胡世莱,李继强,等.扇三角洲前缘砂体内部结构控油模式[J].大庆石油地质与开发,2017,36(1):10-16.
[15]杨勇强,邱隆伟,姜在兴,等.陆相断陷湖盆滩坝沉积模式-以东营凹陷古近系沙四上亚段为例[J].石油学报,2011,32(3):417-423.
[16]裴然.金湖凹陷三河地区阜二段滩坝砂体识别方法探讨[J].特种油气藏,2017,24(4):38-41.
[17]张世奇,肖焕钦.陆相断陷湖盆中层序边界的形成机理及其识别特征研究[J].江汉石油学院学报,2003,25(1):4-7.
[18]肖毅,王红亮,邓宏文,等.辽河清水洼陷东营组高分辨率层序格架下沉积演化特征及有利区带预测[J].沉积学报,2008,26(6):1014-1020.
[19]张凤莲,单俊峰,吴兴录,等.辽河滩海地区古近系层序地层特征及控砂、控藏作用[J].现代地质,2012,26(3):561-568.
[20]王鸿军.古龙南地区葡萄花油层高分辨率层序地层学研究[J].大庆石油地质与开发,2015,34(5):38-44.
[21]姜在兴.沉积体系及层序地层学研究现状及发展趋势[J].石油与天然气地质,2010,31(5):535-541.
[22]李建平,杨波,周心怀,等.渤中凹陷东营组层序地层及其沉积相分析[J].东北石油大学学报,2012,36(4):1-9.