塔北-塔中地区三叠纪岩相古地理特征及油气地质意义
|
摘要
通过对塔里木盆地塔北-塔中地区钻井、测井资料综合分析及岩心观察,结合测井相和地震相特征,识别出三叠系发育扇三角洲、辫状河三角洲及湖泊3种沉积类型。沉积相带的展布格局总体表现为从湖盆边缘向中心依次为:扇三角洲、辫状河三角洲—滨浅湖、沼泽—半深湖及深湖相。在研究和地层对比的基础上,对塔北-塔中地区三叠系岩相古地理时空演化进行了详细分析。研究表明:三叠纪沉积环境经过多次湖侵、湖退的旋回变迁,古地理格局的演化与分布在不同时期既有继承性又有差异性。阿瓦提-满加尔凹陷在中晚三叠世具有较好的油气生成条件,但缺乏油气汇聚形成大中型油气田的条件。储层分布受沉积相控制,生储盖组合属典型的自生自储型。三叠系有利岩相过渡带是今后油气勘探的主要方向。
On the basis of the comprehensive analysis for core,drilling and well logging data in Tabei-Tazhong Area of Tarim Basin,three depositional types,i.e.fan delta,braided river delta and lake,are identified in Triassic through combining the characteristics of electrofacies with seismic facies.Generally,the distribution of sedimentary facies belt successively shows fan delta,braided river delta-shore shallow lake,swamp-semideep lake and deep lake facies from lake rim towards center.Based on the research and strata comparison above,the time-space evolution of lithofacies paleogeography of Triassic in the area is analyzed.The research result indicates that the evolution and distribution of aleogeographic framework reveal the succession and otherness in different periods through the multi-cycle transgression and regression for the depositional environment of Triassic.There are the good hydrocarbon generation conditions in Awati-Manjiaer Sag in Middle-Late Triassic.But the condition of hydrocarbon accumulation is absent for the formation of large-medium oil and gas fields.Because the reservoir distribution is dominated by sedimentary facies,source-reservoir-seal assemblages belong to the typical self-generation and self-storage type.The beneficial lithofacies transition belt of Triassic is the main direction of oil-gas exploration in future.
On the basis of the comprehensive analysis for core,drilling and well logging data in Tabei-Tazhong Area of Tarim Basin,three depositional types,i.e.fan delta,braided river delta and lake,are identified in Triassic through combining the characteristics of electrofacies with seismic facies.Generally,the distribution of sedimentary facies belt successively shows fan delta,braided river delta-shore shallow lake,swamp-semideep lake and deep lake facies from lake rim towards center.Based on the research and strata comparison above,the time-space evolution of lithofacies paleogeography of Triassic in the area is analyzed.The research result indicates that the evolution and distribution of aleogeographic framework reveal the succession and otherness in different periods through the multi-cycle transgression and regression for the depositional environment of Triassic.There are the good hydrocarbon generation conditions in Awati-Manjiaer Sag in Middle-Late Triassic.But the condition of hydrocarbon accumulation is absent for the formation of large-medium oil and gas fields.Because the reservoir distribution is dominated by sedimentary facies,source-reservoir-seal assemblages belong to the typical self-generation and self-storage type.The beneficial lithofacies transition belt of Triassic is the main direction of oil-gas exploration in future.
引文
[1]汪忠德,王新海,王锦芳,等.塔里木盆地轮南油田2、3井区三叠系沉积微相研究[J].沉积与特提斯地质,2008,28(3):66-74.Wang Zhongde,Wang Xinhai,Wang Jinfang,et al.Triassic sedimentarymicrofacies in the second and third well fields in the Lunnan Oilfield,Tarim Basin[J].Sedimentary Geology and Tethyan Geology,2008,28(3):66-74.
[2]张纪易.塔里木盆地轮南地区三叠系沉积相分析[J].新疆石油地质,1992,13(4):322-338.Zhang Jiyi.Analysis of sedimentary facies of Triassic strata in LunnanArea of Tarim Basin[J].Xinjiang Petroleum Geology,1992,13(4):322-338.
[3]纪云龙,丁孝忠,李喜臣,等.塔里木盆地库车坳陷三叠纪沉积相与古地理研究[J].地质力学学报,2003,9(3):268-274.Ji Yunlong,Ding Xiaozhong,Li Xichen,et al.Triassic paleogeographyand sedimentary facies of the Kuqa Depression,Tarim Basin[J].Journal of Geomechanics,2003,9(3):268-274.
[4]张文朝,韩春元.塔东北地区三叠系—侏罗系沉积相及找油前景[J].新疆石油地质,1999,20(3):229-234.Zhang Wenchao,Han Chunyuan.Sedimentary facies and explorationprospect of Triassic-Jurassic in northeastern Tarim Basin[J].XinjiangPetroleum Geology,1999,20(3):229-234.
[5]李永安.新疆三叠纪古地理[J].新疆地质,2000,18(4):335-338.Li Yongan.Triassic paleogeography of Xinjiang[J].Xinjiang Geology,2000,18(4):335-338.
[6]王龙樟.塔里木盆地阿瓦提—满加尔坳陷三叠—侏罗纪沉积物源变迁[J].地球科学:中国地质大学学报,2000,25(1):39-43.Wang Longzhang.Provenance evolution and migration of Triassic andJurassic Awat-Manjiaer Depression,Tarim Basin[J].Earth Science:Journal of China University of Geosciences,2000,25(1):39-43.
[7]黄克难,詹家祯,邹义声.新疆库车河地区三叠系和侏罗系沉积环境及古气候[J].古地理学报,2003,5(2):198-207.Huang Kenan,Zhan Jiazhen,Zou Yisheng.Sedimentaryenvironmentsand palaeoclimate of Triassic and Jurassic in Kuqariver area,Xinjiang[J].Journal of Palaeogeography,2003,5(2):198-207.
[2]张纪易.塔里木盆地轮南地区三叠系沉积相分析[J].新疆石油地质,1992,13(4):322-338.Zhang Jiyi.Analysis of sedimentary facies of Triassic strata in LunnanArea of Tarim Basin[J].Xinjiang Petroleum Geology,1992,13(4):322-338.
[3]纪云龙,丁孝忠,李喜臣,等.塔里木盆地库车坳陷三叠纪沉积相与古地理研究[J].地质力学学报,2003,9(3):268-274.Ji Yunlong,Ding Xiaozhong,Li Xichen,et al.Triassic paleogeographyand sedimentary facies of the Kuqa Depression,Tarim Basin[J].Journal of Geomechanics,2003,9(3):268-274.
[4]张文朝,韩春元.塔东北地区三叠系—侏罗系沉积相及找油前景[J].新疆石油地质,1999,20(3):229-234.Zhang Wenchao,Han Chunyuan.Sedimentary facies and explorationprospect of Triassic-Jurassic in northeastern Tarim Basin[J].XinjiangPetroleum Geology,1999,20(3):229-234.
[5]李永安.新疆三叠纪古地理[J].新疆地质,2000,18(4):335-338.Li Yongan.Triassic paleogeography of Xinjiang[J].Xinjiang Geology,2000,18(4):335-338.
[6]王龙樟.塔里木盆地阿瓦提—满加尔坳陷三叠—侏罗纪沉积物源变迁[J].地球科学:中国地质大学学报,2000,25(1):39-43.Wang Longzhang.Provenance evolution and migration of Triassic andJurassic Awat-Manjiaer Depression,Tarim Basin[J].Earth Science:Journal of China University of Geosciences,2000,25(1):39-43.
[7]黄克难,詹家祯,邹义声.新疆库车河地区三叠系和侏罗系沉积环境及古气候[J].古地理学报,2003,5(2):198-207.Huang Kenan,Zhan Jiazhen,Zou Yisheng.Sedimentaryenvironmentsand palaeoclimate of Triassic and Jurassic in Kuqariver area,Xinjiang[J].Journal of Palaeogeography,2003,5(2):198-207.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心