莫东地区白垩系清水河组一段叠瓦状前积地震反射特征的地质意义
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摘要
莫索湾凸起白垩系清水河组一段(K1q1)从上至下可分为薄砂层(K1q11)、高伽马泥岩(K1q21)、底砂岩(K1q31)三个岩性段。其中莫东地区的K1q11为辫状河三角洲前缘叠瓦状前积和侧向迁移叠置型砂体,是由多个砂体前积、叠置和迁移形成的,代表了多个薄砂体顺斜坡方向的前积、叠置和侧向迁移,具有明显的两波谷夹一中—强振幅、连续宽相位波峰地震反射特征,反映了多个薄砂层组合所形成的复波反射,复波的宽度和振幅与薄砂层组所在位置砂层的总厚度及单砂层厚度有关。根据沉积相、古地形和正演模型特征分析了前积体的成因,认为该前积反射反映了间歇型辫状河三角洲前缘席状砂顺斜坡方向的前积作用。在三维地震剖面上对各前积反射体进行追踪和对比,共识别出12个前积朵叶体,前积朵叶体总面积达642.44km2,主要分布于莫东地区的斜坡和低洼地带,易于形成岩性圈闭,具有十分有利的油气成藏条件。
Member 1 of Qingshuihe formation of Cretaceous can be divided into three kinds of lithologic segments,thin sand layer segments(K1q11),high gamma mudstone segments(K1q21),and basal sandstone segments(K1q31) from top to bottom inMosuowan Uplift.K1q11 were formed from sandbodies of braided river delta front and lateral migrated superimposition.They are composed of multiple sand bodies of progradation,superposition and migration.They represent progradation,superposition and lateral migration of multiple thin sand bodies along the direction of slope,which have obvious seismic reflection characteristics,which are two wave troughs clipped a wave peak of medium-high amplitude and continuous wide phase.This kind of sand bodies reflects complex wave from multiple thin sandstones.The amplitude and width of the complex wave could be connected with total thickness of sandstones and single sandstone thickness of the thin sand group.The cause of the progradation bodies were analyzed based on sedimentary facies,ancient topography and forward modeling,and it is concluded that progradation reflections show progradation action of sheet sandstones of the intermittent braided river delta front along the direction of slope.Based on tracking progradation reflectors on 3D seismic sections,twelve lobate sand-bodies were identified with a total area of 642.44km2.They are mainly distributed on the slopes and the low-lying areas in Modong.There lithologic traps could be easily formed with favorable hydrocarbon accumulation conditions.
Member 1 of Qingshuihe formation of Cretaceous can be divided into three kinds of lithologic segments,thin sand layer segments(K1q11),high gamma mudstone segments(K1q21),and basal sandstone segments(K1q31) from top to bottom inMosuowan Uplift.K1q11 were formed from sandbodies of braided river delta front and lateral migrated superimposition.They are composed of multiple sand bodies of progradation,superposition and migration.They represent progradation,superposition and lateral migration of multiple thin sand bodies along the direction of slope,which have obvious seismic reflection characteristics,which are two wave troughs clipped a wave peak of medium-high amplitude and continuous wide phase.This kind of sand bodies reflects complex wave from multiple thin sandstones.The amplitude and width of the complex wave could be connected with total thickness of sandstones and single sandstone thickness of the thin sand group.The cause of the progradation bodies were analyzed based on sedimentary facies,ancient topography and forward modeling,and it is concluded that progradation reflections show progradation action of sheet sandstones of the intermittent braided river delta front along the direction of slope.Based on tracking progradation reflectors on 3D seismic sections,twelve lobate sand-bodies were identified with a total area of 642.44km2.They are mainly distributed on the slopes and the low-lying areas in Modong.There lithologic traps could be easily formed with favorable hydrocarbon accumulation conditions.
引文
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[13]况军,何登发,张年富等.准噶尔盆地莫索湾凸起油气成藏模式.中国石油勘探,2005,1:40～45Kuang Jun,He Dengfa,Zhang Nianfu et al.Oil andgas migration and accumulation pattern of Mosuowanuplift in Junggar basin.China Petroleum Explora-tion,2005,1:40～45
[14]吴晓智,张年富,周路等.准噶尔盆地车莫古隆起构造特征与成藏模式.中国石油勘探,2006,1:65～69Wu Xiaozhi,Zhang Nianfu,Zhou Lu et al.Character-istics and reservoiring mode of Chepaizi-Mosuowanpaleo-uplift in Junggar basin.China Petroleum Ex-ploration,2006,1:65～69
[2]周路.莫索湾地区石炭系古隆起构造演化分析.博士后研究成果论文集.北京:石油工业出版社,2005,176～182
[3]周路,付立,瞿建华等.车排子地区清水河组分布特征及有利勘探区.西南石油大学学报(自然科学版),2011,33(6):170～178Zhou Lu,Fu Li,Qu Jianhua et al.The distribution ofthe Cretaceous Qingshuihe formation in Chepaizi areaand the favorable exploration areas.Journal of South-west Petroleum University,2011,33(6):170～178
[4]斯春松,王海东,唐勇等.准噶尔盆地腹部白垩系清水河组清一段高分辨率层序地层特征及岩性油气藏预测.东华理工学院学报,2005,28(4):567～57Si Chunsong,Wang Haidong,Tang Yong et al.High-resolution sequence stratigraphic characteristic and li-thological reservoir prediction of section of Qing-shuihe formation in the central of Junggar basin.Journal of East China Institute of Technology,2005,28(4):567～57
[5]蒲仁海.前积反射的地质解释.石油地球物理勘探,1994,29(4):490～497Pu Renhai.Geological interpretation of progradationalreflections.OGP,1994,29(4):490～497
[6]蒲仁海,苏江玉,俞仁连.泥岩形成的前积反射.石油地球物理勘探,2012,47(4):624～628Pu Renhai,Su Jiangyu and Yu Renlian.Progradation-al reflections caused by shale.OGP,2012,47(4):624～628
[7]刘朋波,蒲仁海,刘娟霞.松辽盆地十屋断陷前积反射特征及意义.石油地球物理勘探,2010,45(1):115～121Liu Pengbo,Pu Renhai and Liu Juanxia.Progradationreflection characteristics and significance in Shiwufault depression,Songliao Basin.OGP,2010,45(1):115～121
[8]唐勇,孔玉华,盛建红等.准噶尔盆地腹部缓坡型岩性地层油气藏成藏控制因素分析.沉积学报,2009,27(3):567～572Tang Yong,Kong Yuhua,Sheng Jianhong et al.Con-trolling factors of reservoir formation in ramp-typelithostratigraphic reservoir in hinterland of Junggarbasin.Acta Sedimentologica Sinica,2009,27(3):567～572
[9]衣怀峰,吴孔友,曲江秀.准噶尔盆地莫索湾地区构造特征及其演化.油气地质与采收率,2005,12(4):1～3Yi Huaifeng,Wu Kongyou,Qu Jiangxiu.Tectoniccharacteristics and its evolution of Mosuowan area inJunggar basin.Petroleum Geology and Recovery Ef-ficiency,2005,12(4):1～3
[10]吴孔友,查明,王绪龙等.准噶尔盆地莫索湾地区断层控油作用.地质力学学报,2005,11(1):61～64Wu Kongyou,Zha Ming,Wang Xulong et al.Fault con-trols on oil and gas in the Mosuowan area,Junggar ba-sin.Journal of Geomechanics,2005,11(1):61～64
[11]薄冬梅,姜林,曲江秀.准噶尔盆地莫索湾地区原油运移研究.中国石油大学学报(自然科学版),2007,31(4):18～23Bo Dongmei,Jiang Lin,Qu Jiangxiu.Study on oil mi-gration in Mosuowan area of Junggar basin.Journalof China University of Petroleum(Edition of NaturalScience),2007,31(4):18～23
[12]姜林,吴孔友,曲江秀.准噶尔盆地莫索湾地区油源分析.西安石油大学学报(自然科学版),2005,20(2):25～30Jiang Lin,Wu Kongyou,Qu Jiangxiu.Analysis of theoil source in Mosuowan area of Zhungeer basin.Jour-nal of Xi’an Shiyou University(Natural Science E-dition),2005,20(2):25～30
[13]况军,何登发,张年富等.准噶尔盆地莫索湾凸起油气成藏模式.中国石油勘探,2005,1:40～45Kuang Jun,He Dengfa,Zhang Nianfu et al.Oil andgas migration and accumulation pattern of Mosuowanuplift in Junggar basin.China Petroleum Explora-tion,2005,1:40～45
[14]吴晓智,张年富,周路等.准噶尔盆地车莫古隆起构造特征与成藏模式.中国石油勘探,2006,1:65～69Wu Xiaozhi,Zhang Nianfu,Zhou Lu et al.Character-istics and reservoiring mode of Chepaizi-Mosuowanpaleo-uplift in Junggar basin.China Petroleum Ex-ploration,2006,1:65～69
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