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
摘要
赛汉塔拉凹陷是二连盆地主要的油气富集凹陷之一,面积2300km2,探明石油地质储量1458万吨。论文应用层序地层学的基本理论,根据钻井和三维地震资料,在下白垩统中识别出5个层序界面,以此将该套地层划分为4个三级层序和12个体系域,建立了赛汉塔拉凹陷下白垩统层序地层格架。通过层序内部沉积体系及其演化的研究,对层序格架内的烃源岩条件、储集层条件等成藏要素进行了综合分析,确定了3套生储盖组合。综合分析表明,阿尔善组中下部、腾一段中部的近岸水下扇和浊积扇砂体,垂向上与烃源岩直接连通,可形成有效的生储盖组合,在凹陷生油中心附近易形成有效的岩性圈闭,成为凹陷最有利的油气聚集带,是下一步的重点勘探目标。
The Saihantala Sag is one of the main hydrocarbon enrichment sags in Erlian Basin,with an area of 2300 km2 and proved geological reserves of 14580 000 tons.According to the basic theories of sequence stratigraphy,5 sequence stratigraphic boundaries were recognized by seismic profile and drilling data,and as a result,the Lower Cretaceous of Saihantala Sag was classified into 4 third-order sequences.The systems tracts were subdivided with first flooding surfaces and maximum flooding surfaces within each stratigraphic sequence and thus the sequence stratigraphic framework was established for the Lower Cretaceous of Saihantala Sag.Reservoir-forming factors in different sequences,such as hydrocarbon source and reservoir condition,and so on,were comprehensively analyzed by studies of depositional systems and their evolution,and 3 sets of source-reservoir-cap rock assemblages were established in the Lower Cretaceous of Saihantala Sag.The sandbodies of sublacustrine fan and turbidite fan of the Lower-Middle A'ershan Formation and middle part of Member 1 of the Tengge'er Formation,which were connected with source rocks in vertical direction,are able to form effective lithologic traps around the oil generating center of Saihantala Sag.Thus they are the most favourable hydrocarbon accumulation zones and the main exploration targets of the Saihantala Sag.
The Saihantala Sag is one of the main hydrocarbon enrichment sags in Erlian Basin,with an area of 2300 km2 and proved geological reserves of 14580 000 tons.According to the basic theories of sequence stratigraphy,5 sequence stratigraphic boundaries were recognized by seismic profile and drilling data,and as a result,the Lower Cretaceous of Saihantala Sag was classified into 4 third-order sequences.The systems tracts were subdivided with first flooding surfaces and maximum flooding surfaces within each stratigraphic sequence and thus the sequence stratigraphic framework was established for the Lower Cretaceous of Saihantala Sag.Reservoir-forming factors in different sequences,such as hydrocarbon source and reservoir condition,and so on,were comprehensively analyzed by studies of depositional systems and their evolution,and 3 sets of source-reservoir-cap rock assemblages were established in the Lower Cretaceous of Saihantala Sag.The sandbodies of sublacustrine fan and turbidite fan of the Lower-Middle A'ershan Formation and middle part of Member 1 of the Tengge'er Formation,which were connected with source rocks in vertical direction,are able to form effective lithologic traps around the oil generating center of Saihantala Sag.Thus they are the most favourable hydrocarbon accumulation zones and the main exploration targets of the Saihantala Sag.
引文
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李金良,樊太亮,张岳桥.2007.二连盆地白音查干凹陷层序地层及其油气勘探意义[J].地质力学学报,13(1):60-68.
刘立,付荣.2001.辽河盆地东部凹陷北段复式断陷层序地层与油气[J].古地理学报,3(1):71-77.
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.
严德天,王华,王家豪,等.2008.黄骅坳陷沙河街组层序地层样式及隐蔽圈闭预测[J].中国矿业大学学报,37(1):30-36.
杨雷,梅志超,熊伟.2001.陕北地区延长组层序地层划分与含油气性[J].古地理学报,3(3):83-87.
易士威,王元杰,钱铮.2006.二连盆地乌里雅斯太凹陷油气成藏模式及分布特征[J].石油学报,27(3):27-31.
张成,魏魁生.2005.乌尔逊凹陷南部层序地层特征及成藏条件[J].石油学报,26(2):47-52.
朱筱敏,董艳蕾,杨俊生,等.2008.辽东湾地区古近系层序地层格架与沉积体系分布[J].中国科学(D辑),38(S1):1-10.
Eriksson MJ,Calner M.2008.A sequence stratigraphical model for theLate Ludfordin(Silurian)of Gotland,Sweden:Implications for tim-ing between changes in sea level,palaeoecology,and the global car-bon cycle[J].Facies,54(2):253-276.
Gao D.2007.Application of three-dimensional seismic texture analysiswith special reference to deep-marine facies discrimination and inter-pretation:Offshore Angola,west Africa[J].AAPG Bulletin,91(12):1665-1684.
Graversen O.2004.Upper Triassic-Lower Cretaceous seismic sequence stratig-raphy and basin tectonics at Bornholm,Denmark,Tornquist Zone,NWEurope[J].Marine and Petroleum Geology,21(5):579-612.
Houston,John.2004.High-resolution sequence stratigraphy as a tool inhydrogeological exploration in the Atacama Desert[J].QuarterlyJournal of Engineering Geology and Hydrogeology,37(1):7-17.
Lu Hongbo,Fulthorpe,Craig S.2004.Controls on sequence stratigraphyof a middle Miocene-Holocene,current-swept,passive margin:Off-shore Canterbury Basin[J].New Zeland:Bulletin of the GeologicalSociety of America,116(11-12):1345-1366.
Modica,Christopher J,Brush E R.2004.Postrift sequence stratigraphy,paleogeography,and fill history of the deep-water Santos Basin,off-shore southeast Brazil[J].AAPG,88(7):923-945.
Nadjafi M,Mahboubi A,Moussavi-Harami R,et al.2004.Depositionalhistory and sequence stratigraphy of outcropping Tertiary carbonatesin the Jahrum and Asmari Formations,Shiraz area(SW Iran)[J].Journal of Petroleum Geology,27(2):179-190.
Varban B L,Plint AG.2008.Sequence stacking patterns in the WesternCanada foredeep:Influence of tectonics,sediment loading and eu-stasy on deposition of the Upper Cretaceous Kaskapau and CardiumFormations[J].Sedimentology,55(2):395-421.
Shelley,David C L,Tim F.2005.Sequence stratigraphy of tidally influ-enced deposits in a salt-withdrawal minibasin:Upper sandstonemember of the Potrerillos Formation(Paleocene),La Popa Basin,Mexico[J].AAPG,89(9):1157-1179.
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