渤中坳陷沙北地区古地貌恢复及其应用
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摘要
综合运用地震、测井和录井资料,采用盆地地史模拟技术,对渤中坳陷沙北地区古近系三级层序进行了古地貌恢复,详细解剖了古沟谷和构造坡折带的类型及特征,分析了古地貌各要素对沉积体系发育的影响,提出了"源、沟、坡(槽)、洼、时"等5个要素的时空耦合对沉积体系展布的控制作用。其中,古隆起(凸起)指明了沉积物的来源和方向;古沟谷是物源区与沉积区的重要搬运通道;构造坡折带(或断槽)为重要的沉积场所,并制约着盆地可容纳空间的大小;盆底(洼陷)地貌则控制着沉积体形态和产状,并对烃源岩的品质和规模具有重要影响。研究认为古地貌各要素在时空上的有效配置是准确把握沉积体系展布特征以及提高油气勘探成功的关键。
With integrated use of seismic,logging and log data,simulation technology of basin history is adopted for palaeogeomorphic recovery for the 3rd-order in Paleogene,Shabei Area,Central Bohai Depression. Types and features of paleo-ravine and structural break zone are examined in detail and influences of various factors of ancient landform on the development of sedimentary system are analyzed to put forward controlling effect. The control of time-space combination of five elements( origin,ravine,slope( trench),sag and time) on extension of sedimentary system is proposed. Specifically,the paleo-uplift( bulge) indicates the origin and direction of sediments; paleo-ravine is the major transportation passage between provenance and sedimentary area; structural break zone( or faulted trench) is the major place for sedimentation and control the size to receive sediments in the basin; the basin bottom( sag) controls the sediments shape and occurrence,which is of great importance to the quality and scale of source rock. It is believed that the effective combination of various elements in time-space of ancient landform is the key to grasp the extension features of sedimentary system and enhance the success ratio of oil/gas exploration.
引文
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