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首页> 外文期刊>AAPG Bulletin >Depositional systems and sequence architecture of the Oligocene Dongying Formation, Liaozhong depression, Bohai Bay Basin, northeast China
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Depositional systems and sequence architecture of the Oligocene Dongying Formation, Liaozhong depression, Bohai Bay Basin, northeast China

机译：渤海湾盆地辽中depression陷渐新世东营组沉积体系和层序构造

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摘要

The sequence-stratigraphic framework and depositional systems of an Oligocene lacustrine rift succession in the Liaozhong depression of Bohai Bay Basin in northeastern China were investigated using seismic profiles, complemented by well logs and cores. Seven sequences are identified on the basis of unconformities on basin margins and correlative conformities in the basin center. Depositional systems are associated with systems tracts within sequences. Lowstand systems tracts are dominated by sublacustrine fans; transgressive systems tracts are mainly composed of beach-bar deposits; and highstand systems tracts are characterized by deep lacustrine fan or braid-delta deposits. Episodic tectonic movement was the principal factor that controlled the development of the sequences. Lake-level changes resulting from climatic oscillations may have controlled the development of these sequences. The balance between tectonic subsidence and sediment supply controlled the type of lake basin. The Bohai Bay Basin was a balanced-fill basin in the early and middle stages of the Dongying Formation and evolved into an overfilled basin at the end of deposition of the Dongying Formation. This study enhances the understanding of depositional system configuration and systems tracts in a typical rift basin and proposes that the most favorable sandstone reservoirs are developed in sublacustrine fan deposits. Relative lowstand sublacustrine fan deposits capped by relative highstand prodelta or deep lacustrine mudstones form the highest potential li-thostratigraphic traps.
机译：利用地震剖面资料，结合测井和岩心资料，研究了中国东北渤海湾盆地辽中depression陷渐新统湖相裂谷序列的层序-地层格架和沉积体系。根据盆地边缘的不整合面和盆地中心的相关整合点，确定了七个序列。沉积系统与序列中的系统区域相关联。低水位系统区域主要由湖底湖扇构成。海侵系统道主要由滩涂沉积物组成;高水位系统道的特征是深湖扇或辫状三角洲沉积物。情景构造运动是控制序列发育的主要因素。气候波动导致的湖泊水位变化可能已经控制了这些序列的发展。构造沉降与沉积物供应之间的平衡控制了湖盆的类型。渤海湾盆地是东营组早期和中期的平衡充填盆地，并在东营组沉积结束时演变成一个超充填盆地。这项研究增进了对典型裂谷盆地沉积系统构造和系统区域的认识，并提出最有利的砂岩储集层发育于湖底扇沉积物中。相对低水位的湖底扇形沉积物由相对高水位的前陆三角洲或深湖相泥岩覆盖，形成了潜在的岩性地层圈闭。

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