珠江口盆地惠州凹陷新近系坡折带成因类型及对地层沉积的控制作用
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摘要
惠州凹陷新近系地处浅海陆架背景,地层发育相对平缓,通过地震、钻测井等地质资料的综合研究,发现依然存在沉积坡折带、断裂坡折带和挠曲坡折带3种主要类型的坡折带。这些坡折带在平面上呈顺源多级坡折带组合、斜交组合、梳状组合和平行山梁组合4种组合类型。并且坡折带的演化具有明显的继承性、间歇性、规模递变性和迁移旋回性。研究进一步揭示,盆地北缘和南部的坡折带对地层的叠置样式及沉积体系的发育和空间展布起着明显的控制作用。
The Neogene in Huizhou Depression were deposited in neritic shelf environment and is gentle in dip.However,a comprehensive study of seismic,drilling,log data indicates that three types of slope-breaks (i.e.deposition breaks,fault breaks and flexural breaks) occur in the area.On the plane,these breaks combine with one another in four patterns,including multistage,diagonal,comb-shaped,and ridge-parallel.Their evolution presents such evident features as inheritance,periodicity,scale grading,and migration cyclicity.Slope-breaks in the north margin and south of the basin control the superimposing pattern of the sequences and the development and spatial distribution of depositional systems.
The Neogene in Huizhou Depression were deposited in neritic shelf environment and is gentle in dip.However,a comprehensive study of seismic,drilling,log data indicates that three types of slope-breaks (i.e.deposition breaks,fault breaks and flexural breaks) occur in the area.On the plane,these breaks combine with one another in four patterns,including multistage,diagonal,comb-shaped,and ridge-parallel.Their evolution presents such evident features as inheritance,periodicity,scale grading,and migration cyclicity.Slope-breaks in the north margin and south of the basin control the superimposing pattern of the sequences and the development and spatial distribution of depositional systems.
引文
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2王英民,金武弟,刘书会,等.断陷湖盆多级坡折带的成因类型、展布及其勘探意义[J].石油与天然气地质,2003,24(3):199～214
3林畅松,潘元林,肖建新,等.“构造坡折带”———断陷盆地层序分析与和油气预测的重要概念[J].地球科学(中国地质大学学报),2000,25(3):260～266
4姜秀芳,宗国洪,郭玉新,等.断裂坡折带低位扇成因及成藏特征[J].石油与天然气地质,2002,23(2):143～144
5Cross TA,Lessenger MA.Sediment volume partitioning:rationale for stratigraphic model evaluation and high Resolution stratigraphic correlation[A].Gradstein F M,Sandvik K O,Milton N J,eds.Se-quence Stratigraphy Concepts and Applications[C].NPF Special Publication,1998,8:171-195
6邓宏文.沉积物体积分配原理———高分辨率层序地层学的理论基础[J].地学前缘,2000,7(4):305～313
7Posamentier HW,Jervey MT.Eustatic controls on clastic deposi-tion I-Conceptual frameworks[A].In:xvilgus C W,eds Sea-level changes:an interpreted approach[C].Houston,TX,United States:Spec Publ Soc Ecan Paleont Miner1988,42:104-114
8林畅松,杨海军,刘景彦,等.塔里木早古生代原盆地古隆起地貌和古地理格局与地层圈闭发育分布[J].石油与天然气地质,2006,29(2):189～197
9龙更生,施和生,杜家元.珠江口盆地惠州地区中新统地层岩性圈闭形成条件分析[J].中国海上油气,2006,18(4):229～235
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