西湖凹陷深层宝石组沉积相特征及沉积相模式
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摘要
西湖凹陷是我国近海海域最大的凹陷之一,同时也是天然气勘探的重点区域。目前对该区研究主要集中在始新统平湖组和渐新统花港组,但对于凹陷深层始新统宝石组研究极为薄弱。以典型单井岩心精细观察为基础,综合运用古生物、岩心、测井和地震资料,对西湖凹陷深层宝石组沉积相类型、特征及分布规律进行了分析。研究表明,西湖凹陷深层宝石组主要发育有河流、三角洲、湖泊及扇三角洲4种沉积相类型,其中河流、三角洲相主要分布在地形较缓的西部斜坡带,扇三角洲主要分布在凹陷东部断阶带,滨浅湖亚相在西湖凹陷分布最为广泛,半深湖亚相发育面积较小,主要分布在凹陷中央。在沉积相平面分布特征的基础上结合该区古构造发育特征,建立了西湖凹陷深层宝石组的沉积相模式。
Xihu Depression was one of the largest depressions in offshore areas of China,and also a key natural gas exploration area.Currently,the researches were focused on Eocene Pinghu Formation and Oligocene Huagang Formation.However,the research on deep reservoirs of Eocene Baoshi Formation was extremely weak.Based on single-well core fine observation,comprehensive application of paleontology,core,well logging and seismic data,the sedimentary facies type,sedimentary characteristics and distribution of deep reservoirs of Baoshi Formation in Xihu Depression were analyzed.The results show that Baoshi Formation mainly develops fluvial facies,delta facies,lacustrine facies,and fan-delta facies.Among them,the river and delta deposits are developed in the western gentle slope belt of Xihu Depression,and fan-delta sediments are developed in the eastern steep slope zone,lacustrine facies is widely distributed,the distributing area of semi-deep lacustrine is small,they are manly distributed in the center of the depression.On the basis stated above,the depositional model of Baoshi Formation in Xihu Depression is established.
Xihu Depression was one of the largest depressions in offshore areas of China,and also a key natural gas exploration area.Currently,the researches were focused on Eocene Pinghu Formation and Oligocene Huagang Formation.However,the research on deep reservoirs of Eocene Baoshi Formation was extremely weak.Based on single-well core fine observation,comprehensive application of paleontology,core,well logging and seismic data,the sedimentary facies type,sedimentary characteristics and distribution of deep reservoirs of Baoshi Formation in Xihu Depression were analyzed.The results show that Baoshi Formation mainly develops fluvial facies,delta facies,lacustrine facies,and fan-delta facies.Among them,the river and delta deposits are developed in the western gentle slope belt of Xihu Depression,and fan-delta sediments are developed in the eastern steep slope zone,lacustrine facies is widely distributed,the distributing area of semi-deep lacustrine is small,they are manly distributed in the center of the depression.On the basis stated above,the depositional model of Baoshi Formation in Xihu Depression is established.
引文
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