车排子地区构造-古地貌特征及其控砂机制
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摘要
利用地震、测井及测试资料,采用回剥技术及剥蚀量的趋势分析方法,恢复了准噶尔盆地车排子地区下白垩统吐谷鲁群层序低位体系域、古近系层序低位体系域及新近系中新统沙湾组层序湖扩体系域的底界面同沉积期古地貌。并分析了3个时期古地貌特征及其对下切谷砂砾岩体、扇三角洲砂砾岩体及滩坝砂体的控制作用。在此基础上,总结了3个时期地貌控砂模式,认为吐谷鲁层序低位期具隆起区供砂,低隆起区和"梁"分砂,沟谷输砂,凹陷聚砂的特点;古近系层序低位期古地貌控砂机制与吐谷鲁层序低位期的相似,但沟谷输砂特点不明显;沙湾组层序湖扩期具坡折带控砂和低隆起区控砂的特点。
Seismic,log,and test data as well as the backstripping technique and trend analysis method of erosion restoration,were employed in the synsedimentary palaeogeomorphology reconstruction of basal boundaries of the lowstand system tracts(LST) of the Lower Cretaceous Tugulu Group sequence,the LST of the Paleogene sequence and the lacustrine expanding system tract of the Miocene Shawan Formation sequence in the Chepaizi area,Junggar basin.The paleogeomorphologic features of these three stages and their control on glutenite in incised valley,fan deltaic glutenite and longshore sandbody were analyzed.Based on the results of these studies,this paper summarizes the controlling patterns of the geomorphology on sandbody distributions during these three stages.The LST of the Tugulu Group sequence is characterized by sand supply from the uplift,diversion of the low uplift and "ridge",transportation along the valley,and accumulation in the sag.The LST of the Paleogene sequence shares the similar features with the Tugulu Group sequence except for the insignificant feature of transportation along the valley,while the lacustrine expanding system tract of the Miocene Shawan Formation features in control of slope-break zone and low uplift zone on transportation and deposition of sand.
Seismic,log,and test data as well as the backstripping technique and trend analysis method of erosion restoration,were employed in the synsedimentary palaeogeomorphology reconstruction of basal boundaries of the lowstand system tracts(LST) of the Lower Cretaceous Tugulu Group sequence,the LST of the Paleogene sequence and the lacustrine expanding system tract of the Miocene Shawan Formation sequence in the Chepaizi area,Junggar basin.The paleogeomorphologic features of these three stages and their control on glutenite in incised valley,fan deltaic glutenite and longshore sandbody were analyzed.Based on the results of these studies,this paper summarizes the controlling patterns of the geomorphology on sandbody distributions during these three stages.The LST of the Tugulu Group sequence is characterized by sand supply from the uplift,diversion of the low uplift and "ridge",transportation along the valley,and accumulation in the sag.The LST of the Paleogene sequence shares the similar features with the Tugulu Group sequence except for the insignificant feature of transportation along the valley,while the lacustrine expanding system tract of the Miocene Shawan Formation features in control of slope-break zone and low uplift zone on transportation and deposition of sand.
引文
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2 Breckenridge R M,Othberg KL,Bush J H.Stratigraphy and paleo-geomorphology of Columbia River Basalt,eastern margin of the Co-lumbia River plateau[J].Geological Society of America,1997,29(5):6
3 Paul J M,I.Peter M,Dale AL.Use of micromorphology for palaeo-environmental interpretation of complex alluvial palaeosols:anexample fromthe Mill Creek Formation(Albian),southwestern Al-berta,Canada[J].Palaeogeography,Palaeoclimatology,Palaeo-ecology,1998,143(1-3):87-110
4 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):1 875
5宋凯,吕剑文,凌升阶,等.鄂尔多斯盆地定边—吴旗地区前侏罗纪古地貌与油藏[J].古地理学报.2003,5(4):497~507
6赵俊兴,陈洪德.鄂尔多斯盆地侏罗纪早中期甘陕古河的演化变迁[J].石油与天然气地质,2006,27(2):152~158
7李宏伟,袁士义,朱怡翔,等.河流相地层相分异与沉积物体积分配规律[J].石油与天然气地质,2005,26(3):356~360
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张建林,林畅松,郑和荣.断陷湖盆断裂、古地貌及物源对沉积体系的控制作用——以孤北洼陷沙三段为例[J].油气地质与采收率,2002,9(4):24~27
11林畅松,潘元林,肖建新,等.“构造坡折带”——断陷盆地层序分析和油气预测的重要概念[J].地球科学,2000,25(3):260~266
12任建业,张青林,陆永潮.东营凹陷弧形断裂坡折带系统及其对低位域砂体的控制[J].沉积学报,2004,22(4):628~634
13刘豪,王英民.塔里木盆地早古生代古地貌——坡折带特征及对地层岩性圈闭的控制[J].石油与天然气地质,2005,26(3):297~304
14王风华,李荣权.构造转换带精细研究及非构造油气藏勘探[J].新疆石油地质,2006,27(2):178~180
15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
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