蒙古国塔南凹陷下白垩统铜钵庙组地震反射特征
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摘要
铜钵庙组是塔南凹陷的重要含油气层位,精细研究其层序地层,有助于进一步对油气藏进行勘探和开发。主要利用地震反射特征,结合单井资料,对铜钵庙组进行了层序界面的识别,并首次在本区对层序内部体系域地震反射特征进行详细研究。铜钵庙组顶、底界面(T3、T5)为区域不整合面,分别表现为高角度不整合和"上超下剥"的反射特征;内部以T3--1为界分为2个三级层级(SQ1、SQ2)。T3--1为局部不整合面,主要表现为上超。体系域在本区东次凹上部层序SQ2中发育完整,被首次上超面、末次上超面和顶部的下超面分为LST、TST、HST和RST。在此基础上分析了铜钵庙组的内部反射结构,认为本区存在5种主要反射结构,其中,杂乱反射、楔状反射、前积反射地震相出现在山(陆架)前地区,代表扇三角洲沉积;亚平行反射、波状反射代表滨浅湖沉积或三角洲平原沉积;平行反射位于盆地地堑中心,代表半深湖、深湖沉积。
Tongbomiao Formation is an important horizon bearing oil and gas in Tanan Sag.Studying thoroughly its sequence stratigraphy is beneficial for further exploration of the reservoir.Using the seismic reflection characteristics combined with single well data,the sequence interfaces are recognized,and the seismic reflection characteristics of the internal system traces are studied for the first time.The top and bottom interfaces of Tongbomiao Formation(T3,T5) are regional unconformities and characterized by high angular unconformity with the "upside onlap and below denudation" reflection in feature.The Tongbomiao Formation can be divided into two sequences in third order(SQ1,SQ2) by T3——1,which is a local unconformity with the onlop reflection.In the eastern sub-sag,system tracts are fully developed in the upper sequence(SQ2),and can be divided into LST、TST、HST and RST respectively by the first onlap interface,the last onlap interface and the downlap interface.Based on the fact,the internal reflection structures of Tongbomiao Formation have been analyzed.There mainly exist 5 kinds of reflection structures,named disorder-,foreset-,wedge-shaped-,parallel and sub-parallel or wavy-shaped reflections.Among them,the first three reflections mainly appear on the front of mountains,representing the fan delta sediments,the sub-parallel or wavy-shaped reflection representing the shallow lake or fan delta plain sediments,and the parallel reflection represents the semi-deep lake or deep lake sediments.
Tongbomiao Formation is an important horizon bearing oil and gas in Tanan Sag.Studying thoroughly its sequence stratigraphy is beneficial for further exploration of the reservoir.Using the seismic reflection characteristics combined with single well data,the sequence interfaces are recognized,and the seismic reflection characteristics of the internal system traces are studied for the first time.The top and bottom interfaces of Tongbomiao Formation(T3,T5) are regional unconformities and characterized by high angular unconformity with the "upside onlap and below denudation" reflection in feature.The Tongbomiao Formation can be divided into two sequences in third order(SQ1,SQ2) by T3——1,which is a local unconformity with the onlop reflection.In the eastern sub-sag,system tracts are fully developed in the upper sequence(SQ2),and can be divided into LST、TST、HST and RST respectively by the first onlap interface,the last onlap interface and the downlap interface.Based on the fact,the internal reflection structures of Tongbomiao Formation have been analyzed.There mainly exist 5 kinds of reflection structures,named disorder-,foreset-,wedge-shaped-,parallel and sub-parallel or wavy-shaped reflections.Among them,the first three reflections mainly appear on the front of mountains,representing the fan delta sediments,the sub-parallel or wavy-shaped reflection representing the shallow lake or fan delta plain sediments,and the parallel reflection represents the semi-deep lake or deep lake sediments.
引文
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[2]纪友亮,曹瑞成,蒙启安,等.塔木察格盆地塔南凹陷下白垩统层序结构特征及控制因素分析[J].地质学报,2009,83(6):827-835.JI You-liang,CAO Rui-cheng,MENG Qi-an,et al.A-nalysis of sequence structure and its controlling factors inlower Cretaceous in Tanan Depression,Tamuchage Basin[J].Acta Geologica Sinica,2009,83(6):827-835.
[3]杨永华,纪友亮,曹瑞成,等.塔木察格盆地塔南凹陷下白垩统层序结构类型、控制因素与层序发育模式[J].现代地质,2009,23(4):655-666.YANG Yong-hua,JI You-liang,CAO Rui-cheng,et al.Types of sequences,controlling factors and sequencemodels for lower Cretaceous of Tanan Depression in Tamt-sag Basin,Mongolia[J].Geoscience,2009,23(4):655-666.
[4]王玉华,蒙启安,张革,等.塔南凹陷油气成藏条件与富集规律[J].大庆石油地质与开发,2009,28(5):13-17.WANG Yu-hua,MENG Qi-an,ZHANG Ge,et al.Hydrocabon accumulation conditions and enrichment rulein Tanan Sag[J].Petroleum Geology and Oilfield De-velopment in Daqing,2009,28(5):13-17.
[5]渠永红,万传彪,杜恩泽,等.海拉尔—塔木察格盆地地层划分对比及勘探意义[J].大庆石油地质与开发,2010,29(5):53-59.QU Yong-hong,WAN Chuan-biao,DU En-ze,et al.Stratigraphic classification comparison of Hailaer-TamtsagBasin and its significance for exploration[J].PetroleumGeology and Oilfield Development in Daqing,2010,29(5):53-59.
[6]Angeleri G P,Carpi R.Porosity prediction from seismicdata[J].Geophysical Prospecting,1982,30(5):580-607.
[7]Catuneanu O,Eriksson P.Sedimentology and sequencestratigraphy of fluvial deposits:a tribute to Andrew Miall[J].Sedimentary Geology,2006,190(1/4):1-351.
[8]Brown S,Donovan D,Fisher B,et al.The economic im-pact of international climate change policy ABARE re-search report[C].1997,97(4):1-107.
[9]Vail P R.Seismic stratigraphy interpretation using se-quence stratigrapth,Part 1:seismic stratigraphy inter-pretation procedure[J].AAPG Studies in Geology,1987(1):1-10.
[10]刘招君,董清水,王嗣敏,等.陆相层序地层学导论与应用[M].北京:石油工业出版社,2002:1-178.LIU Zhao-jun,DONG Qing-shui,WANG Si-min,etal.Introduction to contimental sequence stratigraphy&application[M].Beijing:Petroleum Industry Press,2002:1-178.
[11]刘招君,孙平昌,杜江峰,等.汤原断陷古近系扇三角洲沉积特征[J].吉林大学学报:地球科学版,2010,40(1):1-8.LIU Zhao-jun,SUN Ping-chang,DU Jiang-feng,etal.Sedimentary characters of fan delta of Paleocene inTangyuan fault depression[J].Journal of Jilin Univer-sity:Earth Science Edition,2010,40(1):1-8.
[12]马琳,郭巍,刘群,等.伊通盆地鹿乡断陷双阳组储层孔隙结构特征及其控制因素[J].世界地质,2010,29(2):284-291.MA Lin,GUO Wei,LIU Qun,et al.Pore structurecharacteristics and controlling factors of Shuangyang For-mation reservoir in Luxiang fault depression,Yitong Ba-sin[J].Global Geology,2010,29(2):284-291.
[13]贾建亮,刘招君,陈永成,等.测井约束地震岩性预测方法及应用—以汤原断陷达连河组SD2段为例[J].世界地质,2009,28(3):339-344.JIA Jian-liang,LIU Zhao-jun,CHEN Yong-cheng,etal.lithologic prediction and application of log--constrain-ed seismic--an example from SD2 segment of DalianheFormation of Tangyuan fault depression[J].GlobalGeology,2009,28(3):339-344.
[14]何玉平,刘招君,董清水,等.依舒地堑汤原断陷古近系湖底扇沉积与层序特征[J].世界地质,2006,25(1):23-28.HE Yu-ping,LIU Zhao-jun,DONG Qing-shui,et al.Sedimentary and sequence characteristics of Paleogenesublacustrine fan of Tangyuan-fault depression in YishuGraben[J].Global Geology,2006,25(1):23-28.
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