伊宁凹陷三叠系小泉沟群沉积相分析及其生油意义
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摘要
伊宁凹陷是伊犁盆地最重要的含油气凹陷,而伊宁凹陷中上三叠统小泉沟群(T2-3XQ)又是该凹陷重要的烃源岩层段之一。为了进一步弄清楚小泉沟群生油岩的分布情况,利用钻井、测井以及二维地震资料对其沉积特征及沉积演化进行了分析和研究,识别出多种沉积相类型,主要包括湖泊相、扇三角洲相和河流相等。通过测井约束反演揭示了小泉沟群的沉积相平面展布特征,认为小泉沟群可分为上、下两段,下段主要为扇三角洲—滨浅湖相沉积,上段主要为滨浅湖—半深湖相沉积,局部发育深湖相沉积;反映了小泉沟群沉积经历了水体逐步加深、范围逐步扩大的过程。
Xiaoquangou Group is one of the important hydrocarbon source rock inte rvals in Yining Depression,the most important petroleum sag in Yili Basin.To f urther clarify the source rock distribution,the analysis of its sedimentary cha racteristics and evolution is made based on the core description,well logging a nd seismic data.Many types of sedimentary facies in the group are distinguished,mainly including lake facies,rivers facies and fan delta facies.The logging constraint inversion shows that Xiaoquangou Group can be divided into upper and lower sections.The lower segment mainly consists of fan delta-shore shallow la custrine facies deposition,and the upper one is mainly composed of shore shallo w lake-half deep lacustrine facies deposition,locally with deep lacustrine faci es.This reflects the gradual deepening and expansion of the water body of Xiaoq uangou Group.
Xiaoquangou Group is one of the important hydrocarbon source rock inte rvals in Yining Depression,the most important petroleum sag in Yili Basin.To f urther clarify the source rock distribution,the analysis of its sedimentary cha racteristics and evolution is made based on the core description,well logging a nd seismic data.Many types of sedimentary facies in the group are distinguished,mainly including lake facies,rivers facies and fan delta facies.The logging constraint inversion shows that Xiaoquangou Group can be divided into upper and lower sections.The lower segment mainly consists of fan delta-shore shallow la custrine facies deposition,and the upper one is mainly composed of shore shallo w lake-half deep lacustrine facies deposition,locally with deep lacustrine faci es.This reflects the gradual deepening and expansion of the water body of Xiaoq uangou Group.
引文
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[2]董秀芳,熊永旭.伊宁盆地类型及其石油地质意义[J].石油实验地质,1995,17(1):17-24.
[3]Dewey J F.Extension collapse of orogens[J].Tectonics,1988,7:1123-1139.
[4]Tapponnier P,Monlar P.Active faulting and Cenozoic tecton-ics of the Tianshan,Mongolia,and Baykal regions[J].Journalof Geophysical Research,1979,84:3425-3459.
[5]Hendrix M S,Dumitru T A,Gramham S A.Late Oligocene-early Miocene unroofing in the Chinese Tianshan:An earlyeffect of the India-Asia collision[J].Geology,1994,22:487-490.
[6]韩效忠,李胜群,蔡煜琦,等.伊犁盆地南缘隆升剥蚀及其盆地南部的沉积响应[J].岩石学报,2008,24(10):2450-2454.
[7]Lu Huafu,Howell D G,Jia Dong,et al.Rejuvenation of theKuqaforeland Basin,north flank of the Tarim Basin,NorthwestChina[J].International Geology Review,1994,36:1151-1158.
[8]Soble E P,Chen J,Heermance R R.Late Oligocene-Early ini-tiation of shortening in the southwestern Chinese Tianshan:Implication for Neogene shortening rate variation[J].Earthand Planetary Science Letters,2006,247:70-81.
[9]Ratschbacher L.Extension in compressional orogenic belts[J].Geology,1989,17:404-407.
[10]Che Z C,Liu L,Liu H F,et al.Review on the Ancient Yilirift,Xinjiang,China[J].Acta Petrologica,1996,12(3):478-490.
[11]冯建辉,陶国强,梅志超,等.新疆伊犁盆地地层划分与对比[J].断块油气藏,1996,3(3):23-25.
[12]邹元荣,金晓辉,闫相宾.塔河油田三叠系层序地层与沉积相研究[J].西安石油大学学报:自然科学版,2008,23(5):12-14.
[13]崔智林,梅志超.新疆伊宁盆地的三叠系[J].中国区域地质,16(4):374-377.
[14]李光云.伊犁盆地油气地质特征及勘探前景[J].新疆地质,2002,20(1):72-75.
[15]李盛富,颜启明,王新宇,等.伊犁盆地水西沟群冲积扇-扇三角洲沉积体系研究[J].新疆地质,2006,24(3):297-304.
[16]郝继鹏,杨志勇,史建宏,等.伊犁盆地石炭系-二叠系含油气性特征[J].沉积与特提斯地质,2003,23(1):75-82.
[17]苗建宇,周立发,邓昆,等.伊犁盆地二叠系烃源岩沉积环境[J].石油与天然气地质,2004,25(3):295-298.
[18]周小进,段铁军,江兴歌.伊犁盆地伊宁凹陷油气资源勘探潜力分析[J].中南大学学报:自然科学版,2006,37(增刊1):29-34.
[19]王峻,刘家铎,田景春,等.伊宁凹陷古地温恢复与热演化史研究[J].成都理工大学学报,1997,33(6):376-379.
[20]许书堂,张同周,常俊合,等.伊利盆地饱和烃特征及其古环境意义[J].断块油气藏,1998,5(2):23-24.
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