北非NK地区上白垩统灰岩裂缝油藏成藏因素
|
摘要
北非Pelagian盆地是一个重要的含油气盆地,在North Kairouan地区已经取得了一些积极的勘探成果,但仍存在油藏成藏条件复杂,主控因素不清、勘探难度大、勘探成效低等问题。以地震、钻井及分析化验资料为基础,对研究区上白垩统灰岩裂缝储层成藏条件进行了综合分析,认为该区油气成藏主要受裂缝的走向及发育程度、有效输导层以及盖层的分布共同控制,北西向断层及裂缝发育、具备复式输导层和厚层盖层的构造发育区为有利油气聚集区,指出NK地区中部复杂背斜带和东部鼻状隆起带为两个有利油气勘探带,对该区碳酸盐岩油藏勘探具有指导意义。
The Pelagian Basin in North Africa is one of the important oil and gas basins.Based on the seismic,drilling,analytic and testing data,the comprehensive analysis of the forming conditions of the Upper Cretaceous fractured limestone reservoirrevealsthefollowingpoints:theformationoftheoilandgasreservoirinthisregionismainlycontrolledbyoilresource conditions,thestrikeandabundanceofthefractureandfault,aswellasthedistributionofeffectivetransportlayerandthickcap rock;the structural areas developed northwest faults and fractures,composite passage system and thick cap rock are favorable areasofhydrocarbonmigrationandaccumulation.Thefaultsandfracturesdevelopinginthedirectionofnortheastareunsealed,which is beneficial for the lateral and vertical migration of the hydrocarbon and for the improvement of the limestone reservoir property.ThemovementofsaltinthelatePalaeocenemakesthemudstoneoftheHariaformation,whichistheregionalcovering strata,partially eroded,resulting in the maldistribution and the change of the thickness of the cap rock in the region,which can greatly influence the height of hydrocarbon column of reservoir that can be sealed.As a result,it is pointed out that the complex anticline belt in central NK and the nosing belt in Eastern NK are two favorable areas of oil and gas accumulation,which provide guidelines for the exploration of carbonate reservoir in this region.
The Pelagian Basin in North Africa is one of the important oil and gas basins.Based on the seismic,drilling,analytic and testing data,the comprehensive analysis of the forming conditions of the Upper Cretaceous fractured limestone reservoirrevealsthefollowingpoints:theformationoftheoilandgasreservoirinthisregionismainlycontrolledbyoilresource conditions,thestrikeandabundanceofthefractureandfault,aswellasthedistributionofeffectivetransportlayerandthickcap rock;the structural areas developed northwest faults and fractures,composite passage system and thick cap rock are favorable areasofhydrocarbonmigrationandaccumulation.Thefaultsandfracturesdevelopinginthedirectionofnortheastareunsealed,which is beneficial for the lateral and vertical migration of the hydrocarbon and for the improvement of the limestone reservoir property.ThemovementofsaltinthelatePalaeocenemakesthemudstoneoftheHariaformation,whichistheregionalcovering strata,partially eroded,resulting in the maldistribution and the change of the thickness of the cap rock in the region,which can greatly influence the height of hydrocarbon column of reservoir that can be sealed.As a result,it is pointed out that the complex anticline belt in central NK and the nosing belt in Eastern NK are two favorable areas of oil and gas accumulation,which provide guidelines for the exploration of carbonate reservoir in this region.
引文
[1]Klett T R.Total petroleum systems of the Pelagianprovince,Tunisia,Libya,Italy,and malt the bou d-abbous—tertiary and jurassic-cretaceous composite[C].United States Geological Survey,2001.
[2]关增淼,李剑.非洲油气资源与勘探[M].石油工业出版社,北京,2007.
[3]Khomsi S,Jemia M,Lamotte D,et al.An overview ofthe late cretaceous-eocene positive inversions and oli-go-miocene subsidence events in the foreland of thetunisianatlas:Structuralstyleandimplicationsforthetec-tonic agenda of the Maghrebian Atlas system[J].Tectono-physics,2009,475,38-58.
[4]Lamotte D F,Leturmy P,Missenard Y,et al.Meso-zoic and Cenozoic vertical movements in the Atlas system(Algeria,Morocco,Tunisia):An overview[J].Tectono-physics,2009,475:9-28.
[5]Dhahri F,Boukadi N.The evolution of pre-existing struc-tures during the tectonic inversion process of the atlaschain of tunisia[J].Journal of African Earth Sciences,2010,56:139-149.
[6]MelkiaF,ZouaghiT,HarrabS,etal.Structuringandevo-lution of Neogene transcurrent basins in the Tellian fore-land domain,north-eastern Tunisia[J].Journal of Geody-namics,2011,52:57-69.
[7]王金鹏,彭仕宓,管志强,等.柴达木盆地第四系生物气藏泥岩盖层封闭机理[J].西南石油大学学报,2007,29(6):63-67.Wang Jinpeng,Peng Shimi,Guan Zhiqiang,et al.Mud-stone caprock’s sealing mechanism of blogenetic gasreservoir of quaternary in qaidam basin[J].Journal ofSouthwest Petroleum university,2007,29(6):63-67.
[8]石宝德.关于盖层与油气聚集关系的探讨[J].西南石油学院学报,1989,11(1):28-33.ShiBaode.Approachtotherelationbetweencap-rockandoil-gas accumulation[J].Journal of Southwest PetroleumInstitute,1989,11(1):28-33.
[9]付广,张发强,吕延防.厚度在盖层封闭油气中的作用[J].天然气地球科学,1998,9(6):20-25.
[10]吕延防,付广,高大岭,等.油气藏封盖研究[M].北京:石油工业出版社,1996.4-30.
[11]童晓光,牛嘉玉.区域盖层在油气聚集中的作用[J].石油勘探与开发,1989,16(4):1-7.Tong Xiaoguang,Niu Jiayu.Effects of regional cap for-mation on oil and gas accumulation[J].Pteroleum Explo-ration and Development,1989,16(4):1-7.
[12]蒋有录.油气藏盖层厚度与所封盖烃柱高度关系问题探讨[J].天然气工业,1998,18(2):20-23.
[2]关增淼,李剑.非洲油气资源与勘探[M].石油工业出版社,北京,2007.
[3]Khomsi S,Jemia M,Lamotte D,et al.An overview ofthe late cretaceous-eocene positive inversions and oli-go-miocene subsidence events in the foreland of thetunisianatlas:Structuralstyleandimplicationsforthetec-tonic agenda of the Maghrebian Atlas system[J].Tectono-physics,2009,475,38-58.
[4]Lamotte D F,Leturmy P,Missenard Y,et al.Meso-zoic and Cenozoic vertical movements in the Atlas system(Algeria,Morocco,Tunisia):An overview[J].Tectono-physics,2009,475:9-28.
[5]Dhahri F,Boukadi N.The evolution of pre-existing struc-tures during the tectonic inversion process of the atlaschain of tunisia[J].Journal of African Earth Sciences,2010,56:139-149.
[6]MelkiaF,ZouaghiT,HarrabS,etal.Structuringandevo-lution of Neogene transcurrent basins in the Tellian fore-land domain,north-eastern Tunisia[J].Journal of Geody-namics,2011,52:57-69.
[7]王金鹏,彭仕宓,管志强,等.柴达木盆地第四系生物气藏泥岩盖层封闭机理[J].西南石油大学学报,2007,29(6):63-67.Wang Jinpeng,Peng Shimi,Guan Zhiqiang,et al.Mud-stone caprock’s sealing mechanism of blogenetic gasreservoir of quaternary in qaidam basin[J].Journal ofSouthwest Petroleum university,2007,29(6):63-67.
[8]石宝德.关于盖层与油气聚集关系的探讨[J].西南石油学院学报,1989,11(1):28-33.ShiBaode.Approachtotherelationbetweencap-rockandoil-gas accumulation[J].Journal of Southwest PetroleumInstitute,1989,11(1):28-33.
[9]付广,张发强,吕延防.厚度在盖层封闭油气中的作用[J].天然气地球科学,1998,9(6):20-25.
[10]吕延防,付广,高大岭,等.油气藏封盖研究[M].北京:石油工业出版社,1996.4-30.
[11]童晓光,牛嘉玉.区域盖层在油气聚集中的作用[J].石油勘探与开发,1989,16(4):1-7.Tong Xiaoguang,Niu Jiayu.Effects of regional cap for-mation on oil and gas accumulation[J].Pteroleum Explo-ration and Development,1989,16(4):1-7.
[12]蒋有录.油气藏盖层厚度与所封盖烃柱高度关系问题探讨[J].天然气工业,1998,18(2):20-23.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心