塔里木盆地志留-泥盆纪岩相古地理及时空演化特征研究  

The Lithofacies-paleogeography and Space-time Evolvement of Silurian-Devonian in the Tarim Basin

作　　者：张翔 田景春 彭军[2] 

机构地区：[1]成都理工大学'油气藏地质及开发工程'国家重点实验室成都理工大学沉积地质研究院,成都610059 [2]西南石油大学,成都610500

出　　处：《沉积学报》2008年第5期762-771,共10页Acta Sedimentologica Sinica

基　　金：中国石油化工股份有限公司西部新区勘探指挥部科研项目(项目编号:XBKT2002KY-05040)部分成果

摘　　要：近年来塔里木盆地志留—泥盆系油气勘探的发现,使其研究重新受到重视,但仍存在一些制约志留—泥盆系勘探的基础地质问题需要深入研究。通过对塔里木盆地周缘野外剖面、盆内钻井、岩芯详细的分析,在地层划分、对比的基础上,结合地震相研究成果,将塔里木盆地泥盆—志留系划分为3个沉积体系组(分别为陆相、海陆过渡和海洋沉积体系组),进一步识别出8个沉积体系。在上述沉积相研究基础上,结合测井相、地震相的识别,对塔里木盆地志留—泥盆系岩相古地理特征及时空演化进行了详细研究,研究表明在志留—泥盆纪沉积演化过程中,岩相古地理分布特征在各个时期存在差异性,但在整个古地理演化过程中,又具有继承性。具体表现为:整个志留纪以陆棚、滨岸、潮坪沉积为主,沉积相带总体表现为南北向分带、东西向展布的格局;晚志留世—泥盆纪总体为滨海—潮坪环境,沉积相带较前期局限;晚泥盆世晚期为滨岸—潮坪环境,沉积区进一步缩小。这一系列研究成果的取得,将会为储层分布规律研究和油气预测提供基础地质资料。A great attention has been repaid to the study of the Silurian-Devonian in the Tarim Basin due to the discovery of petroleum in the interval, but there still exists some basic geologic problems which hinder the exploration. Through comprehensive analysis of field section, drilling well and well core, on the basis of detailed strata division and comparison, the Silurian-Devonian was identified three sedimentary system group （including continental facies, marine-continental transition and marine sedimentary system group） in the Tarim Basin, and can be further identified eight sedimentary system. On the basis of the above sedimentary research, combining the identification of well logging and seismic facies. The detailed research on the character and space-time evolvement of the lithofacies- paleogeography of Silurian-Devonian has been carried out, and the research indicates that in the process of sedimentary evolvement, the character of lithofacies paleogeography is different in each phase, but it is succession. It shows that the dominant facies is shelf sea, shore and tidal-flat in the whole Silurian, and the sedimentary facies zone is South-North zonation, east-west spread; from late Silurian to Devonian the sedimentary environment is shore and tidal-flat, but the sedimentary facies zone is more limited; late Late Devonian the sedimentary environment is shore and tidal-flat, and the sedimentary range is more shorten. The obtain of above research will provide base information for the studying of reservoir regulatities of distribution and petroleum forcasting.

关 键 词：塔里木盆地 志留-泥盆纪 沉积体系 岩相古地理 时空演化特征 

分 类 号：P531[天文地球—古生物学与地层学] P315.7[天文地球—地质学]