青东凹陷古近系沙三段中亚段构造—古地貌对沉积的控制
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摘要
利用地震、测井及录井资料,采用回剥技术及断失量的趋势分析方法,恢复了古近系沙三段中亚段沉积时期青东凹陷的构造—古地貌,阐明了构造—古地貌对沉积体系的控制.受郯庐断裂及其派生断裂的控制,古近系沙三段中亚段沉积时期青东凹陷呈现整体沉陷,为一东断西超的箕状断陷,凹中发育3个近东西向的次隆,将青东凹陷分隔为4个次洼,由南至北,次洼的规模逐渐扩大.受构造-古地貌的控制,沙三段中亚段青东凹陷的东部发育扇三角洲,西部和南部发育辫状河三角洲.三角洲沉积体系的主体发育部位明显受次洼的控制.由于凹陷规模小,物源供应充分,扇三角洲和辫状河三角洲的砂质沉积不同程度下超于中部次隆之上,由于次隆地带水浅浪强,形成规模不等的砂质滩坝.中部次隆规模较大,在缺少陆源碎屑供应的地带,发育钙质浅滩和泥滩.发育于东部断坡带的三角洲砂体,发育于西部斜坡带的辫状河三角洲砂体,以及发育于次隆地带的砂质滩坝砂体均具有较好的储集条件和较好的圈闭背景,是油气勘探的重要目标.
Based on seismic,log curves and logging data,we adopted the analysis of back stripping technology and the trend analysis of faulted strata amount,the tectonic-paleogeomorphic of Palelgene Es3M in Qingdong Sag was restored,and tectonic-paleogeomorphic controlled on depositional system has been clarified.Controlled by Tancheng-Lujiang fault and its derived faults,Qingdong sag appeared as overall subsidence in Paleogene Es3M was a half graben which eastern boundary is Tancheng-Lujiang fault.There were 3 sub-uplifts,4 sub-sags developing in the sag nearly east-westward.The scale of the sub-sags getting larger and larger from south to north.Controlled by tectonic-paleogeomorphic,Qingdong sag of Paleogene Es3M developed fan delta depositional system in its eastern part near fault boundary and braided river delta depositional system in its western and southern part on the gentle slope.The main part of delta depositional system was obviously limited by sub-sags.Due to the small scale and sufficient sediment supply of Qingdong Sag,sandy sediments of fan delta and braided river delta showed downlap on sub-uplifts in different degree.The sandy beach and bars developed in different scales in sub-uplifts resulted from the shallow water and strong waves.Fan-delta sandy body of fault steep slope belt in eastern part,braided river delta sandy body of gentle slope belt in western and southern part and sandy beach and bars developed in sub-uplifts,which have good reservoir conditions and trap backgrounds,are the main target of oil and gas exploration.
Based on seismic,log curves and logging data,we adopted the analysis of back stripping technology and the trend analysis of faulted strata amount,the tectonic-paleogeomorphic of Palelgene Es3M in Qingdong Sag was restored,and tectonic-paleogeomorphic controlled on depositional system has been clarified.Controlled by Tancheng-Lujiang fault and its derived faults,Qingdong sag appeared as overall subsidence in Paleogene Es3M was a half graben which eastern boundary is Tancheng-Lujiang fault.There were 3 sub-uplifts,4 sub-sags developing in the sag nearly east-westward.The scale of the sub-sags getting larger and larger from south to north.Controlled by tectonic-paleogeomorphic,Qingdong sag of Paleogene Es3M developed fan delta depositional system in its eastern part near fault boundary and braided river delta depositional system in its western and southern part on the gentle slope.The main part of delta depositional system was obviously limited by sub-sags.Due to the small scale and sufficient sediment supply of Qingdong Sag,sandy sediments of fan delta and braided river delta showed downlap on sub-uplifts in different degree.The sandy beach and bars developed in different scales in sub-uplifts resulted from the shallow water and strong waves.Fan-delta sandy body of fault steep slope belt in eastern part,braided river delta sandy body of gentle slope belt in western and southern part and sandy beach and bars developed in sub-uplifts,which have good reservoir conditions and trap backgrounds,are the main target of oil and gas exploration.
引文
[1]Lezzar K E,Tiercelin J J.Control of normal fault interaction on the distribution of major neogene sedimentary depocenters,lake tan-ganyika,east african rift[J].AAPG Bulletin,2002,86(6):1027-1059.
[2]Cowie P A,Gupta S,Dawers N H.Implications of fault array evolutionfor synrift depocentre development:insights froma numerical fault growth model[J].Basin Research,2000,12:241-261.
[3]McLeod A E,Underhill J R,Davies S J,et al.The influence of fault array evolution on synrift sedimentation patterns:on depositon in the strathspey-brent-statfjord half graben,northern north sea[J].AAPG Bulletin,2002,86(6):1069-1100.
[4]Davies SJ,Dawers N H,McLeod AE,et al.The structural and sedimentological evolution of early synrift successions:the middleju-rassic tarbert formation,north sea[J].Basin Research,2000,12:343-365.
[5]Tony J T.Reservoir characterization,paleoenvironment,and paleo-geomorphology of the mississippian redwall limestone paleokarst,hualapai indian reservation,grand canyon area,arizona[J].AAPG Bulletin,2000,84(11):1875.
[6]林畅松,郑和荣,任建业,等.渤海湾盆地东营、沾化凹陷早第三纪同沉积断裂作用对沉积充填的控制[J].中国科学(D辑),2003,33(11):1025-1036.
[7]邢凤存,陆永潮,刘传虎,等.车排子地区构造—古地貌特征及其控砂机制[J].石油与天然气地质,2008,29(1):78-83.
[8]柳保军,袁立忠,申俊,等.南海北部陆坡古地貌特征与13.8Ma以来珠江深水扇[J].沉积学报,2006,24(4):476-482.
[9]邓宏文,王红亮,王敦则.古地貌对陆相裂谷盆地层序充填特征的控制—以渤中凹陷西斜坡区下第三系为例[J].石油与天然气地质,2001,22(4):293-303.
[10]刘延莉,邱春光,邓宏文,等.冀东南堡凹陷古近系东营组构造对扇三角洲的控制作用[J].石油与天然气地质,2008,29(1):96-101.
[11]李春荣,辛仁臣,李建平,等.郯庐断裂对青东凹陷古近纪沉积体系的控制[J].新疆石油地质,2008,29(2):209-213.
[12]徐长贵,赖维成,薛永安,等.古地貌分析在渤海古近系储集层预测中的应用[J].石油勘探与开发,2004,31(5):53-56.
[13]孙永河,漆家福,吕延防,等.渤中拗陷断裂构造特征及其对油气的控制[J].石油学报,2008,29(5):669-675.
[14]龚再升.中国近海含油气盆地新构造运动和油气成藏[J].石油与天然气地质,2004,25(2):133-138.
[15]张万选.陆相断陷盆地区域地震地层学研究[M].北京:石油大学出版社,1988:68-78.
[16]樊太亮,吕延仓,丁明华.层序地层体制中的陆相储层发育规律[J].2000,7(4):315-321.
[17]俞家声,王普伟,林玉祥.青东凹陷油气资源潜力[J].油气地质与采收率,2001(1):5-8.
[18]邓运华.郯庐断裂带新构造运动对渤海东部油气聚集的控制作用[J].中国海上油气(地质),2001,15(5):301-305.
[19]吴丽艳.浅谈我国油气勘探中的古地貌恢复技术[J].石油天然气学报(江汉石油学院学报),2005,27(4):559-560.
[2]Cowie P A,Gupta S,Dawers N H.Implications of fault array evolutionfor synrift depocentre development:insights froma numerical fault growth model[J].Basin Research,2000,12:241-261.
[3]McLeod A E,Underhill J R,Davies S J,et al.The influence of fault array evolution on synrift sedimentation patterns:on depositon in the strathspey-brent-statfjord half graben,northern north sea[J].AAPG Bulletin,2002,86(6):1069-1100.
[4]Davies SJ,Dawers N H,McLeod AE,et al.The structural and sedimentological evolution of early synrift successions:the middleju-rassic tarbert formation,north sea[J].Basin Research,2000,12:343-365.
[5]Tony J T.Reservoir characterization,paleoenvironment,and paleo-geomorphology of the mississippian redwall limestone paleokarst,hualapai indian reservation,grand canyon area,arizona[J].AAPG Bulletin,2000,84(11):1875.
[6]林畅松,郑和荣,任建业,等.渤海湾盆地东营、沾化凹陷早第三纪同沉积断裂作用对沉积充填的控制[J].中国科学(D辑),2003,33(11):1025-1036.
[7]邢凤存,陆永潮,刘传虎,等.车排子地区构造—古地貌特征及其控砂机制[J].石油与天然气地质,2008,29(1):78-83.
[8]柳保军,袁立忠,申俊,等.南海北部陆坡古地貌特征与13.8Ma以来珠江深水扇[J].沉积学报,2006,24(4):476-482.
[9]邓宏文,王红亮,王敦则.古地貌对陆相裂谷盆地层序充填特征的控制—以渤中凹陷西斜坡区下第三系为例[J].石油与天然气地质,2001,22(4):293-303.
[10]刘延莉,邱春光,邓宏文,等.冀东南堡凹陷古近系东营组构造对扇三角洲的控制作用[J].石油与天然气地质,2008,29(1):96-101.
[11]李春荣,辛仁臣,李建平,等.郯庐断裂对青东凹陷古近纪沉积体系的控制[J].新疆石油地质,2008,29(2):209-213.
[12]徐长贵,赖维成,薛永安,等.古地貌分析在渤海古近系储集层预测中的应用[J].石油勘探与开发,2004,31(5):53-56.
[13]孙永河,漆家福,吕延防,等.渤中拗陷断裂构造特征及其对油气的控制[J].石油学报,2008,29(5):669-675.
[14]龚再升.中国近海含油气盆地新构造运动和油气成藏[J].石油与天然气地质,2004,25(2):133-138.
[15]张万选.陆相断陷盆地区域地震地层学研究[M].北京:石油大学出版社,1988:68-78.
[16]樊太亮,吕延仓,丁明华.层序地层体制中的陆相储层发育规律[J].2000,7(4):315-321.
[17]俞家声,王普伟,林玉祥.青东凹陷油气资源潜力[J].油气地质与采收率,2001(1):5-8.
[18]邓运华.郯庐断裂带新构造运动对渤海东部油气聚集的控制作用[J].中国海上油气(地质),2001,15(5):301-305.
[19]吴丽艳.浅谈我国油气勘探中的古地貌恢复技术[J].石油天然气学报(江汉石油学院学报),2005,27(4):559-560.
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