塔中志留系层序及其可容纳空间分析
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摘要
根据经典层序地层学理论,综合研究野外露头、测井、地震等资料,将塔中地区志留系划分为5个层序,每个层序均由海侵和高位体系域两部分组成。除SQ1为Ⅰ型层序外,其余4个层序均为Ⅱ型层序,而且SQ3为一个三级中间体系域。受加里东运动影响,隆升后的塔中地区在晚奥陶世遭受剥蚀,地形变得平缓,在此基础上形成了以潮坪沉积为主的志留纪滨浅海沉积。在志留纪塔中地区构造稳定,海平面的升降决定了可容纳空间的大小。潮坪沉积相带的迁移反映了在全球海平面升降形成的异旋回中发育的潮坪自旋回沉积,可容纳空间动态变化是外在的表现形式。
The Silurian strata in central Tarim Basin,Xinjiang may be grouped,on the basis of classical sequence stratigraphic theory,and outcrops,well logs and seismic sections,into five sequences,of which four are assigned to the type 2 sequence except SQ_1 as the type 1 sequence.Each of them consists of transgressive and highstand systems tracts.SQ_3 is interpreted as a third-order intermediate system tract.Influenced by the Caledonian orogeny,the uplifted central Tarim Basin area was subjected to the erosion during the Late Ordovician,followed by the deposition of the tidal flat-dominated Silurian littoral and shallow marine deposits.The Silurian time was tectonically quiet in this area.The eustatic fluctuations may exercise a major control on the sizes of the accommodation spaces.The migration of the tidal-flat facies has mirrored the variations in accommodation space and tidal energy,and represents the products originated from the combination of autocyclic and allocyclic deposition in response to the global eustatic fluctuations.The dynamic patterns of the accommodation spaces may be the external expressions of tidal cyclicity.
The Silurian strata in central Tarim Basin,Xinjiang may be grouped,on the basis of classical sequence stratigraphic theory,and outcrops,well logs and seismic sections,into five sequences,of which four are assigned to the type 2 sequence except SQ_1 as the type 1 sequence.Each of them consists of transgressive and highstand systems tracts.SQ_3 is interpreted as a third-order intermediate system tract.Influenced by the Caledonian orogeny,the uplifted central Tarim Basin area was subjected to the erosion during the Late Ordovician,followed by the deposition of the tidal flat-dominated Silurian littoral and shallow marine deposits.The Silurian time was tectonically quiet in this area.The eustatic fluctuations may exercise a major control on the sizes of the accommodation spaces.The migration of the tidal-flat facies has mirrored the variations in accommodation space and tidal energy,and represents the products originated from the combination of autocyclic and allocyclic deposition in response to the global eustatic fluctuations.The dynamic patterns of the accommodation spaces may be the external expressions of tidal cyclicity.
引文
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[4]赵靖舟.塔里木盆地石油地质基本特征[J].西安石油学院学报,1997,(3):8-20.
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[7]赵澄林,等.油区岩相古地理[M].东营:石油大学出版社,2001.
[8]胡少华,李秀珍,王庆国.塔里木盆地志留纪地层分布及其地震层序特征[J].石油地球物理物探,2005,40(增刊):11-18.
[9]侯会军,王伟华,朱筱敏.塔里木盆地塔中地区志留系沉积模式探讨[J].沉积学报,2002,15(3):41-47.
[10]吴因业,顾家裕.油气层序地层学[M].北京:石油工业出版社,2002.
[11]谢晓安,吴奇之,等.塔里木盆地中生代构造格架与沉积特征[J].沉积学报,1997,(6):152-155.
[12]徐怀大,樊太亮,等.新疆塔里木盆地层序地层特征[M].北京:地质出版社,1997.
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[14]陈方鸿,王贵文.塔里木盆地塔中地区志留系测井层序地层学研究[J].沉积学报,1999,(1):56-62.
[15]王毅.塔里木盆地震旦系—中泥盆统层序地层分析[J].沉积学报,1999,(3):414-424.
[16]朱筱敏,王贵文,谢庆宾.塔里木盆地志留系沉积体系及分布特征[J].石油大学学报(自然科学版),2002,26(3):5-11.
[17]顾家裕,朱筱敏,等.塔里木盆地层序地层特征与非构造圈闭勘探[M].北京:石油工业出版社,2003.
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[19]顾家裕,等.沉积相与油气[M].北京:石油工业出版社,1994.
[20]朱筱敏.层序地层学[M].北京:石油工业出版社,2003.
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[22]牟书令,等.中石化西部新区勘探论文集[M].北京:石油工业出版社,2004.
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