内蒙古二连盆地阿北凹陷下白垩统近岸水下扇沉积特征
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摘要
阿北凹陷位于内蒙古二连盆地东北部,面积约600km2,是二连盆地勘探潜力最大的凹陷之一。针对阿北凹陷复杂的地质构造,充分利用岩心、录井、测井以及地震等资料,详细分析了阿北凹陷北部陡坡带下白垩统近岸水下扇沉积特征和分布规律。研究表明,近岸水下扇和扇三角洲在岩相组合、沉积构造、粒度特征、电性特征和地震反射特征方面均有较大区别,综合反映以重力流为主的沉积环境。阿尔善期北部陡坡带发育大规模水下扇,扇体规模自下而上逐渐向北部物源方向减小,到腾格尔期沉积了一大套深湖—半深湖暗色泥岩,近岸水下扇砂砾岩体下切到深湖—半深湖暗色泥岩中,决定了研究区近岸水下扇砂体具有优越的成藏条件。
Abei sag, with 600 km2 of area,is one of the most promising exploration area in northeastern Erlian Basin, Inner Mongolia. Considering the complicated geological structure of Abei sag,based on core,logging,well logging and seismic data,this paper analyzed the depositional characteristics and distribution laws of nearshore subaqueous fans in the Lower Cretaceous in northern steep slope zone of the Abei sag in Erlian Basin.The results show that the subaqueous fan and the fan-delta facies were different in lithologic series,sedimentary structure,grain size characteristics,well logging curve and seismic reflection structure,which indicated the gravity flow depositional environment.The deposition of northern steep slope zone developed large-scale nearshore subaqueous fans,and the distribution scale of the fan bodies reduced to northern provenance step by step in ascending order during the Aershan Age.The dark colored mudstones of deep lacustrine and half-deep lacustrine was formed,which the sand bodies of the near-shore subaqueous fans cut down during Tenggeer Age.It makes the study area of the nearshore subaqueous fans have superior oil and gas accumulation conditions.
Abei sag, with 600 km2 of area,is one of the most promising exploration area in northeastern Erlian Basin, Inner Mongolia. Considering the complicated geological structure of Abei sag,based on core,logging,well logging and seismic data,this paper analyzed the depositional characteristics and distribution laws of nearshore subaqueous fans in the Lower Cretaceous in northern steep slope zone of the Abei sag in Erlian Basin.The results show that the subaqueous fan and the fan-delta facies were different in lithologic series,sedimentary structure,grain size characteristics,well logging curve and seismic reflection structure,which indicated the gravity flow depositional environment.The deposition of northern steep slope zone developed large-scale nearshore subaqueous fans,and the distribution scale of the fan bodies reduced to northern provenance step by step in ascending order during the Aershan Age.The dark colored mudstones of deep lacustrine and half-deep lacustrine was formed,which the sand bodies of the near-shore subaqueous fans cut down during Tenggeer Age.It makes the study area of the nearshore subaqueous fans have superior oil and gas accumulation conditions.
引文
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鄢继华,陈世悦.2005.东营凹陷北部陡坡带近岸水下扇沉积特征[J].石油大学学报(自然科学版),29(1):12-16.
尹志军,田世清,杨志彬,等.2009.内蒙二连盆地赛汉塔拉凹陷下白垩统层序地层及有利成藏条件[J].古地理学报,11(3):330-337.
曾洪流,张万选,张厚福.1988.廊固凹陷沙三段主要沉积体的地震相和沉积特征[J].石油学报,9(2):12-18.
张金亮,沈凤.1991.乌尔逊凹陷大磨拐河组近岸水下扇储集层特征[J].石油学报,12(3):25-35.
张萌,田景春.1999.“近岸水下扇”的命名、特征及其储集性[J].岩相古地理,19(4):42-52.
Richard M,Bowman M. 1998. Submarine fans and related depositionalⅡ: Variability in reservoir architecture and wire line log character[J]. Marine and Petroleum Geology,15: 821 -839.
Takahiro S,Makoto Ⅰ. 2002. Deposition of sheet-like turbidite packetsand migration of channel-overbank systems on a sandy submarinefan: An example from the Late Miocene-Early Pliocene Forearc Ba-sin,Boso Peninsula Japan[J]. Sedimentary Geology,149: 265 -277.
Walker R G. 1978. Deep-water sandstone facies and ancient submarinefans: Models for exploration for stratigraphic traps[J]. America As-sociation Petroleum Geological Bulletin,62: 932 - 966.
董荣鑫,苏美珍.1985.近岸水下冲积扇相特征及实例[J].石油实验地质,7(4):294-302.
冯增昭.2004.单因素分析多因素综合作图法:定量岩相古地理重建[J].古地理学报,6(1):3-19.
刘忠宝,刘晓,苗峰,等.2005.阿北凹陷下白垩统阿尔善组水下扇沉积特征[J].沉积与特提斯地质,25(3):57-61.
隋凤贵,操应长,刘惠民,等.2010.东营凹陷北带东部古近系近岸水下扇储集物性演化及其油气成藏模式[J].地质学报,84(2):246-256.
孙连浦,刘招君,李本才,等.2001.水下扇岩相特征及形成机制[J].世界地质,20(3):249-256.
孙永传.1980.水下冲积扇:一个找油的新领域[J].石油实验地质,2(3):32-41.
吴少波,白玉宝,杨友运.2003.内蒙古银根盆地下白垩统沉积相[J].古地理学报,5(1):36-43.
鄢继华,陈世悦.2005.东营凹陷北部陡坡带近岸水下扇沉积特征[J].石油大学学报(自然科学版),29(1):12-16.
尹志军,田世清,杨志彬,等.2009.内蒙二连盆地赛汉塔拉凹陷下白垩统层序地层及有利成藏条件[J].古地理学报,11(3):330-337.
曾洪流,张万选,张厚福.1988.廊固凹陷沙三段主要沉积体的地震相和沉积特征[J].石油学报,9(2):12-18.
张金亮,沈凤.1991.乌尔逊凹陷大磨拐河组近岸水下扇储集层特征[J].石油学报,12(3):25-35.
张萌,田景春.1999.“近岸水下扇”的命名、特征及其储集性[J].岩相古地理,19(4):42-52.
Richard M,Bowman M. 1998. Submarine fans and related depositionalⅡ: Variability in reservoir architecture and wire line log character[J]. Marine and Petroleum Geology,15: 821 -839.
Takahiro S,Makoto Ⅰ. 2002. Deposition of sheet-like turbidite packetsand migration of channel-overbank systems on a sandy submarinefan: An example from the Late Miocene-Early Pliocene Forearc Ba-sin,Boso Peninsula Japan[J]. Sedimentary Geology,149: 265 -277.
Walker R G. 1978. Deep-water sandstone facies and ancient submarinefans: Models for exploration for stratigraphic traps[J]. America As-sociation Petroleum Geological Bulletin,62: 932 - 966.
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