埃塞俄比亚欧加登盆地构造演化及有利区分析
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摘要
目前,欧加登盆地油气探明程度低,处于早期勘探评价阶段。结合区域地质资料、少量钻井和地震数据,认为盆地为东非裂谷系构造成因,伸展构造环境下(半)地堑、地垒、掀斜断块等构造样式常见,相应发育断(块)鼻圈闭、构造-岩性圈闭和生物礁建隆。勘探部署首选区为中央隆起带及外围斜坡地带。中央隆起带形成时间早,后期受东非大裂谷作用较弱,西部紧邻生油凹陷,发育多套储盖组合,成藏条件优越,且已经发现一定规模的油气藏,是寻找大中型油气田的有利区带。
As its oil/gas proved degree is low,Ogaden Basin is in the phase of early exploration and assessment. With reference to the regional geological data,few drilling and seismic data,it is believed that the basin is originated from the structure of East African rift system. In the stretching structural environment,( semi)- graben,horst and tilted block are very common,and correspondingly faulted( block) nose traps,structural- litho trap and bio- reef uplift were developed. The preferred areas for the exploration deployment are the central uplift area and the peripheral slope area. The central uplift area was formed at the early stage,so later East Africa Rift had little effect on the central uplift. Its western part is adjacent to oil generation sag,developing multiple sets of reservoir- caprock assemblage. The accumulation conditions are very favorable and a certain amount of oil and gas reservoirs have been discovered. Therefore,it is the favorable area to look for medium and large oil and gas fields.
As its oil/gas proved degree is low,Ogaden Basin is in the phase of early exploration and assessment. With reference to the regional geological data,few drilling and seismic data,it is believed that the basin is originated from the structure of East African rift system. In the stretching structural environment,( semi)- graben,horst and tilted block are very common,and correspondingly faulted( block) nose traps,structural- litho trap and bio- reef uplift were developed. The preferred areas for the exploration deployment are the central uplift area and the peripheral slope area. The central uplift area was formed at the early stage,so later East Africa Rift had little effect on the central uplift. Its western part is adjacent to oil generation sag,developing multiple sets of reservoir- caprock assemblage. The accumulation conditions are very favorable and a certain amount of oil and gas reservoirs have been discovered. Therefore,it is the favorable area to look for medium and large oil and gas fields.
引文
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[13]温志新,等.东非裂谷系盆地群石油地质特征及勘探潜力[J].中国石油勘探,2012,26(4):60-64.
[14]Karner G D,Byamungu B R,Ebinger C J,et al.Distribution of crustal extension and regional basin architecture of the Albertine rift system,East Africa[J].Marine and Petroleum Geology,2000,17:1131-1150.
[15]Worku T,Astin T R.The Karroo sediments(Late Palaeozoic to Early Jurassic)of the Ogaden Basin,Ethiopia[J].Sedimentary Geology,1992,76(2):7-21.
[2]童晓光.世界石油勘探开发图集(非洲地区分册)[M].北京:石油工业出版社,2004:85-96.
[3]关增淼,李剑.非洲油气资源与勘探[M].北京:石油工业出版社,2005.7-17.
[4]刘剑平,等.西部非洲地区油气地质特征及资源概述[J].石油勘探与开发,2008,35(3):378-384.
[5]刘剑平,潘校华,马君,等.赤道西非科特迪瓦一加纳转换边缘油气勘探方向[J].石油勘探与开发,2010,37(1):44-50.
[6]江文荣,李允,等.非洲油气勘探区战略选择建议[J].石油勘探与开发,2006,33(3):388-392.
[7]裴振洪.非洲区域油气地质特征及勘探前景[J].天然气工业,2004,24(1):29-33.
[8]张可宝,等.东非地区沉积盆地油气潜力浅析[J].天然气地球科学,2007,18(6):869-874.
[9]李建英,陈旭,胡永军,等.埃塞俄比亚欧加丹盆地石油地质特征及勘探潜力[J].石油天然气学报,2014,36(6):16-21.
[10]Reeves C V,De Wit M J.Making ends meet in Gondwana:retracing the transforms of the Indian Ocean and reconnecting continental shear zones[J].Terra Nova,2000,12(6):272-280.
[11]Morley C K,Nelson R A,Patton T L,et al.Transfer zones in the East Africa rift system and their relevance to hydrocarbon exploration in rifts[J].AAPG,1990,74(8):1234-1253.
[12]Kreuser T.Rift to drift in Permian—Jurassic basins of East Africa and hydrocarbon habit in rift basins[J].Geological Society special Pulication,1995,80(2):297-315.
[13]温志新,等.东非裂谷系盆地群石油地质特征及勘探潜力[J].中国石油勘探,2012,26(4):60-64.
[14]Karner G D,Byamungu B R,Ebinger C J,et al.Distribution of crustal extension and regional basin architecture of the Albertine rift system,East Africa[J].Marine and Petroleum Geology,2000,17:1131-1150.
[15]Worku T,Astin T R.The Karroo sediments(Late Palaeozoic to Early Jurassic)of the Ogaden Basin,Ethiopia[J].Sedimentary Geology,1992,76(2):7-21.
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