俄罗斯安加拉—勒拿阶地油气地质特征与勘探潜力分析
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摘要
结合俄罗斯勒拿—通古斯盆地安加拉—勒拿阶地的勘探历史与现状,对相关的钻井、地震及地球化学等资料进行石油地质综合研究,评价了该阶地的石油地质条件与勘探潜力。该阶地(文德系碎屑岩沉积顶面)是一个略向NW方向倾斜的单斜;主要的烃源岩分布在文德系和里菲系地层中,里菲系、文德系烃源岩分别于文德纪、寒武纪进入油气生成的高峰期;主要储层为文德系—寒武系下部的碎屑岩和碳酸盐岩,包括Osin层、Parfenov层、Shamanov层及Bohan层;阶地内的圈闭类型主要为背斜和因地层尖灭和岩性侧变形成的地层岩性圈闭,并发育了多套油气储盖组合;下寒武统的盐岩层为区域盖层。分析认为,因后期的构造运动导致早期聚集的气藏被破坏,在二次或多次运移过程中遇构造圈闭或地层岩性圈闭而聚集成藏。下步主要勘探方向为阶地东南部Parfenov层上倾方向的地层尖灭和岩性侧变成因的地层岩性圈闭。
With the history and current situation of exploration in Angara-Lena terrace,seismic and geochemical data are analyzed to evaluate the petroleum geological factors and exploration potential of the terrace. The terrace is a NW dipping monocline. Source rocks are interpreted to be Riphean and Vendian organic-rich sales. The rocks enter into the hydrocarbon generation peak during Vendian and Cambrian Periods. Reservoirs under the Vendian-Cambrian are clastic rock reservoirs and carbonate reservoirs,including the Osin reservoir,the Parfenov reservoir,the Shamanov reservoir,and the Bohan reservoir. The trap types in the terrace are mainly anticlines and stratigraphic-lithologic traps formed based on strata pinch-out and lateral lithological change. Besides,multiple oil and gas reservoir-seal assemblages are formed. The Lower Cambrian salt formation is regional seal. It is considered that the gas reservoirs accumulated early are destroyed by late structural movement. Gas is accumulated and reservoirs are formed when the gas reservoirs meet structural traps and stratigraphic lithologic traps during the secondary or multi-phase migration. The major exploration targets are the stratigraphic lithologic traps formed based on the lateral lithologic change and the strata pinch-out in the up-dip direction of the Parfenov reservoir southeast of the terrace.
With the history and current situation of exploration in Angara-Lena terrace,seismic and geochemical data are analyzed to evaluate the petroleum geological factors and exploration potential of the terrace. The terrace is a NW dipping monocline. Source rocks are interpreted to be Riphean and Vendian organic-rich sales. The rocks enter into the hydrocarbon generation peak during Vendian and Cambrian Periods. Reservoirs under the Vendian-Cambrian are clastic rock reservoirs and carbonate reservoirs,including the Osin reservoir,the Parfenov reservoir,the Shamanov reservoir,and the Bohan reservoir. The trap types in the terrace are mainly anticlines and stratigraphic-lithologic traps formed based on strata pinch-out and lateral lithological change. Besides,multiple oil and gas reservoir-seal assemblages are formed. The Lower Cambrian salt formation is regional seal. It is considered that the gas reservoirs accumulated early are destroyed by late structural movement. Gas is accumulated and reservoirs are formed when the gas reservoirs meet structural traps and stratigraphic lithologic traps during the secondary or multi-phase migration. The major exploration targets are the stratigraphic lithologic traps formed based on the lateral lithologic change and the strata pinch-out in the up-dip direction of the Parfenov reservoir southeast of the terrace.
引文
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[2]萧德铭,王荣华,蔡天成,等.俄罗斯东西伯利亚及远东地区含油气盆地[M].北京:石油工业出版社,2000:15～51.
[3]Kuznetsov V G.Vendian to Cambrian carbonate reservoir types of the Siberian platform.Petroleum Geoscience,1995,1:271～278.
[4]Kuznetsov V G.Riphean hydrocarbon reservoirs of the Yurubchen-Tokhom zone,Lena-Tunguska province,NE Russia.Journal of Petroleum geology,1997,20(4):459～474.
[5]Clarke James W.Petroleum geology of East Siberia.International Geology Review,1994,36(3):238～249.
[6]Tull S.The diversity of hydrocarbon habitat in Russia.Petroleum Geoscience,1997,3:315～325.
[7]Kazakov B A,Drobot L E,Topeshik B A.西西伯利亚地台文德系科维克金巨型油气聚集带[J].新疆石油地质,2001,22(5):452～457.
[8]Kontorovich A E,Mandel'baum M M,Surkov V S,et al.Lena-Tunguska Proterozoic-Palaeozoic petroleum superprovince,In:Brooks J,ed.Classic petroleum provinces:Geological Society Special Publication,1990,50:473～489.
[9]Khain V E,Sokolov B A,Kleshchev K A,et al.Tectonic and geodynamic setting of oil and gas basins of the Soviet Union.AAPG Bulletin,1991,75(2):313～325.
[10]Oliver G.Fluids expelled tectonically from orogenic belts:their role in hydrocarbon migration and other geological phenomena.Geology,1980,14:99～102.
[11]Kuznetsov V G.Riphean hydrocarbon reservoirs of the Yurubchen-Tokhom zone,Lena-Tunguska province,NE Russia.Journal of Petroleum Geology,1997,20(4):459～474.
[12]Kuznetsov V G,Ilyukhin L N,Miller S A,et al.Paleogeography of boundary sediments of Vendian and Cambrian of the south of the Siberian craton.Petroleum Geology,1996,30(1):21～36.
[13]Matveyev V D,Sitnikov V S,Shabalin V P.Prediction of large non-anticlinal oil and gas traps in West Yakutia.Petroleum Geology,1996,30(1):56～62.
[14]C&C Reservoirs Company.Kovykta Field,Angara-Lena Terrace,Russia.Reservoir Evaluation Report for Former Soviet Union,2004:1～23.
[15]Meyerhoff A A.Geology and petroleum fields in Proterozoic and Lower Cambrian strata,Lena-Tunguska petroleum province,Eastern Siberia,USSR.In:Halbouty M T,ed.Giant Oil and Gas Fields of the Decade1968-1978:AAPG Memoir,1980,30:225～252.
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