库车坳陷亚肯背斜带天然气勘探前景
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摘要
库车坳陷是晚二叠世以来形成的中、新生代前陆盆地。三叠—侏罗系湖相泥质岩和沼泽相煤岩及炭质泥岩为坳陷中主要烃源岩,油气资源量约30×108t油当量。盖层滑脱是构造变形的主要方式,以流变性极强的第三系膏盐岩和膏泥岩为滑脱面,可划分为上、下两个滑脱构造层,上、下滑脱层分别表现为褶皱—逆冲和叠瓦逆冲变形样式。亚肯背斜带在前陆盆地变形机制控制下,以隐伏的顺层滑脱—推覆为特点,褶皱平缓。二维地震勘探在下滑脱层发现了一批圈闭,经对其中的亚肯北构造钻探库1井,取得了重要地质成果,揭示发育多套良好的储盖组合,并取得了油气突破,发现了亚肯北气藏。本文是在库车坳陷以往油气地质研究基础上,根据库1井取得的新成果,进一步探讨亚肯背斜带的天然气成藏条件,指出今后应加强地震勘探力度,发现、落实、评价圈闭,并通过对亚肯北构造的重点解剖,进一步全方位评价亚肯背斜带的天然气勘探前景。
Kuqa depression is the Mesozoic-Cenozoic foreland basin formed after the Late Permian.The Triassic-Jurassic lacustrine mudstone,swamp ingredient and carboneceous mudstone are the main hydrocarbon source rocks in the depression,with hydrocarbon resource is about 3 billion ton oil equivalent.Caprock detachment is the main mode of tectonic deformation.The Neogene gypsum and salt rocks and gypsum mudstone,which have quite strong rheological property,are as the detachment surface and can divide into upper and lower detachment structural layers.The upper detachment shows fold-thrusts distortion and the lower shows imbricated thrusts distortion.Yaken anticline zone controlled by deformation mechanism of foreland basin is characterized by subtle detachment along the formation surface and shows gentle fold.Depending on 2-D seismic data,a lot of traps has been discovered in the lower detachment layer,and the well Ku-1 in north Yaken structural belt reveals a series of good reservoir-cap combination ,gains the oil and gas breakthrough,and resulted in the discovery of north Yaken gas reservoir.On the basis of oil and gas geology research results in Kuqa depression and the new data from well Ku-1,natural gas formation condition in Yaken anticline zone is discussed and its natural potential is indicated.
Kuqa depression is the Mesozoic-Cenozoic foreland basin formed after the Late Permian.The Triassic-Jurassic lacustrine mudstone,swamp ingredient and carboneceous mudstone are the main hydrocarbon source rocks in the depression,with hydrocarbon resource is about 3 billion ton oil equivalent.Caprock detachment is the main mode of tectonic deformation.The Neogene gypsum and salt rocks and gypsum mudstone,which have quite strong rheological property,are as the detachment surface and can divide into upper and lower detachment structural layers.The upper detachment shows fold-thrusts distortion and the lower shows imbricated thrusts distortion.Yaken anticline zone controlled by deformation mechanism of foreland basin is characterized by subtle detachment along the formation surface and shows gentle fold.Depending on 2-D seismic data,a lot of traps has been discovered in the lower detachment layer,and the well Ku-1 in north Yaken structural belt reveals a series of good reservoir-cap combination ,gains the oil and gas breakthrough,and resulted in the discovery of north Yaken gas reservoir.On the basis of oil and gas geology research results in Kuqa depression and the new data from well Ku-1,natural gas formation condition in Yaken anticline zone is discussed and its natural potential is indicated.
引文
张大权,等.新疆塔里木盆地北部构造条件、圈闭类型及油气成藏模式研究(85-101-04-02)
张大权,张先树.新疆塔里木盆地东北地区构造特征及其控油气条件研究(75-54-03-02)
新疆塔里木盆地库车坳陷库1井完井地质报告,2003
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张大权,张先树.新疆塔里木盆地东北地区构造特征及其控油气条件研究(75-54-03-02)
新疆塔里木盆地库车坳陷库1井完井地质报告,2003
[1]周新源.前陆盆地油气分布规律[M].北京:石油工业出版社,2002
[2]陈荣林,叶德燎,徐文明.滨里海盆地与塔里木盆地油气地质特征的类比[J].中国西部油气地质,2006,2(3):261～266
[3]翟晓先主编.塔河油气田勘探与评价文集[M].北京:石油工业出版社,2006,121～134
[4]气藏开发模式丛书编写组编著.气藏开发应用基础技术方法[M].北京:石油工业出版社,1997
[5]王庭斌.中国气藏主要形成、定型于新近纪以来的构造运动[J].石油与天然气地质,2004,25(2):126～132
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