渤中坳陷青东凹陷古近系沙三下亚段构造-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,恢复了古近系沙河街组三段下亚段沉积时期青东凹陷的构造-古地貌,并阐明了构造-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,沙三下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,沙三下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超覆于次隆之上,次隆地带水浅浪强,形成规模不等的砂质滩坝。发育于东部断坡带的三角洲砂体,发育于西部缓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 and log data,we used back-stripping technology and trend analysis method to restore structure-paleogeomorphology of the Qingdong sag during the sedimentation of the lower part of third member of the Paleogene Shahejie Formation (E3s3).We also explained the control of structure-paleogeomorphology on sedimentary systems.Controlled by the Tan-Lu fault and its induced faults,the Qingdong sag subsided as a whole during the sedimentation of the lower part of E3s3.It was a dustpan-shaped rift which was faulted in its eastern part and overlapped in its western part.Within the sag,there were three near east-west-trending sub-uplifts which separated the Qingdong sag into four sub-sags.From south to north,the size of these sub-sags became larger gradually.Controlled by structure-geomorphology,fan deltas were developed in the east of the Qingdong sag,while braided deltas were developed in the west and in the south during the deposition of the lower part of E3s3.The major part of the delta sedimentary system was obviously controlled by the sub-sags.Arenaceous sediments of fan delta and braided delta facies overlapped,in various degrees,the sub-uplifts because of the small size of the sag and sufficient supply of deposits.The shallow water and strong energy resulted in the arenaceous beach-bar facies of different scales on the sub-uplifts.Favorable reservoir conditions and traps are found in delta sandbodies developed on the eastern ramp,braided delta sandbodies developed on the western gentle slope and arenaceous bench bar deposits developed on the sub-uplifts.These sandbodies should be the major exploration targets.
Based on seismic and log data,we used back-stripping technology and trend analysis method to restore structure-paleogeomorphology of the Qingdong sag during the sedimentation of the lower part of third member of the Paleogene Shahejie Formation (E3s3).We also explained the control of structure-paleogeomorphology on sedimentary systems.Controlled by the Tan-Lu fault and its induced faults,the Qingdong sag subsided as a whole during the sedimentation of the lower part of E3s3.It was a dustpan-shaped rift which was faulted in its eastern part and overlapped in its western part.Within the sag,there were three near east-west-trending sub-uplifts which separated the Qingdong sag into four sub-sags.From south to north,the size of these sub-sags became larger gradually.Controlled by structure-geomorphology,fan deltas were developed in the east of the Qingdong sag,while braided deltas were developed in the west and in the south during the deposition of the lower part of E3s3.The major part of the delta sedimentary system was obviously controlled by the sub-sags.Arenaceous sediments of fan delta and braided delta facies overlapped,in various degrees,the sub-uplifts because of the small size of the sag and sufficient supply of deposits.The shallow water and strong energy resulted in the arenaceous beach-bar facies of different scales on the sub-uplifts.Favorable reservoir conditions and traps are found in delta sandbodies developed on the eastern ramp,braided delta sandbodies developed on the western gentle slope and arenaceous bench bar deposits developed on the sub-uplifts.These sandbodies should be the major exploration targets.
引文
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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张树林,费琪,叶加仁.渤海湾盆地边缘凹陷的构造意义[J].石油实验地质,2006,28(5):409～413
12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
13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.2001,8(1):5～8
14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.
2Cowie P A,Gupta S,Dawers N H.Implications of fault array evolu-tion for synrift depocentre development:insights from a numerical fault growth model[J].Basin Research,2000,12:241-261
3McLeod AE,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):1027-1059
4Davies S J,Dawers NH,McLeod AE,et al.The structural and sed-imentological evolution of early synrift successions:the Middle Ju-rassic Tarbert formation,North Sea[J].Basin Research,2000,12:343-365
5Tony 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张树林,费琪,叶加仁.渤海湾盆地边缘凹陷的构造意义[J].石油实验地质,2006,28(5):409～413
12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
13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.2001,8(1):5～8
14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.
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