SEDIMENTARY FACIES OF MEMBER 2 OF SHANXI FORMATION OF LOWER PERMIAN IN THE MIDDLE-EASTERN ORDOS BASIN
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摘要: 从露头分析和岩心观察入手,应用现代沉积学原理,对鄂尔多斯盆地东缘山西组二段露头和盆内岩心中的沉积序列及构造特征进行详细描述。山二段砂岩露头及岩心中广泛发育韵律层理、块状层理、侧积交错层理等高流态层理,露头砂体为透镜状,并在一定范围内相互切割、叠置成宽度和厚度巨大的带状砂层,体现了辫状河高流态及辫状河道砂体频繁摆动、迁移的特征。通过岩石沉积相、测井沉积相、砂体厚度、古地形结合古地理背景等多因素综合分析认为,山二段沉积时期研究区发育远源砂质辫状河—"浅水型"三角洲沉积体系,自北向南依次发育冲积平原辫状河、辫状河三角洲平原、辫状河三角洲前缘、前辫状河三角洲或滨海浅湖相,并识别出辫状河主水道、河漫沼泽、三角洲前缘河口坝等多种亚相、微相类型,明确认为辫状河主水道部分形成的宽厚巨大的主砂带是有利勘探相带。Abstract: Sedimentary sequence and tectonic features of outcrops and cores in Member 2 of Shanxi Formation in the east edge of Ordos Basin are studied with modern sedimentary mechanisms.Rhythmic stratification,block stratification and lateral accretion cross stratification are widely found in outcrops and cores of Member 2 of Shanxi Formation.Outcrop sands are lenticular,cutting each other and piling to large sand belts,due to frequent migrations of braided-river sands.Based on studies of rock sedimentary facies,well logging sedimentary facies,sandbody thickness,palaeotopography and palaeogeologic background,it is pointed out that,when Member 2 of Shanxi Formation deposits,sandy braided-river and shallow water delta system is formed,which can be divided into alluvial plain braided-river,braided-river delta plain,braided-river delta front,frontal braided-river delta or seashore shallow lake facies from north to south.Braided-river main channel,alluvial marsh,delta front debouch bar are distinguished.Main sand belt with large width and thickness proportion in main channel of braided-river is favorable for petroleum exploration.
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[1] 杨俊杰.鄂尔多斯盆地构造演化与油气分布规律[M].北京:石油工业出版社,2002.33~39 [2] 李克勤.中国石油地质志卷十二长庆油田[M].北京:石油工业出版社,1992.181~204 [3] 郭英海,刘焕杰,权彪等.鄂尔多斯地区晚古生代沉积体系及古地理演化[J].沉积学报,1998,16(3):44~51 [4] 陈全红,李文厚,姜培海等.鄂尔多斯盆地西南部上古生界油气成藏条件分析[J].石油实验地质,2007,29(6):554~559 [5] 郭英海,刘焕杰.陕甘宁地区晚古生代沉积体系[J].古地理学报,2000,2(1):19~30 [6] 何义中,陈洪德,张锦泉.鄂尔多斯盆地中部石炭-二叠系两类三角洲沉积机理探讨[J].石油与天然气地质,2001,22(1):68~71 [7] 常象春,王明镇,郭海花.鄂尔多斯盆地多种能源矿产共存特征及其相关性[J].石油实验地质,2006,28(6):507~510 [8] 韩会平,侯云东.武春英鄂尔多斯盆地靖边气田山西组2~3段沉积相与砂体展布[J].油气地质与采收率,2007,14(6):54~56,59 [9] 何义中,陈洪德,张锦泉.鄂尔多斯盆地靖北早二叠世沉积体系[J].新疆石油地质,2002,23(1):27~30 [10] 魏红红,彭惠群,李静群等.鄂尔多斯盆地中部石炭-二叠系沉积相带与砂体展布[J].沉积学报,1999,17(3):403~408 [11] 张义楷,周立发,党犇等.鄂尔多斯盆地中新生代构造应力场与油气聚集[J].石油实验地质,2006,28(3):215~219 [12] 张晓莉.鄂尔多斯盆地中部上古生界砂岩气层沉积体系类型及特征[J].油气地质与采收率,2005,12(4):47~49,89 [13] 杨仁超,韩作振,李文厚等.鄂尔多斯地区二叠系三角洲沉积特征及其模式[J].西北大学学报(自然科学版),2004,34(3):340~344 [14] 于兴河,马兴祥,穆龙新等.辫状河储层地质模式及层次界面分析[M].北京:石油工业出版社,2004 [15] 席胜利,王怀厂,秦伯平.鄂尔多斯盆地北部山西组、下石盒子组物源分析[J].天然气工业,2002,22(2):21~25 [16] 吴崇筠.构造湖盆三角洲与油气分布[J].沉积学报,1983,1(1):5~23 [17] 李维锋,高振中,彭德堂.侧积交错层-辫状河道的沉积构造类型[J].石油实验地质,1996,18(3):298~302 [18] 尚冠雄.华北地台晚古生代煤地质学研究[M].太原:山西科学技术出版社,1997.105~115 -
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