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首页> 外文期刊>Organic Geochemistry: A Publication of the International Association of Geochemistry and Cosmochemistry >Source rocks in Mesozoic-Cenozoic continental rift basins, east China: A case from Dongying Depression, Bohai Bay Basin
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Source rocks in Mesozoic-Cenozoic continental rift basins, east China: A case from Dongying Depression, Bohai Bay Basin

机译：中国东部中新生代陆相裂谷盆地的烃源岩-以渤海湾盆地东营凹陷为例

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摘要

Lake basin evolution, microscopic and organic geochemistry characteristics are investigated for the Paleocone hydrocarbon source rocks of Dongying Depression, Bohai Bay Basin. The upper E-2-3s(4) and the lower E-2-3s(3) are balanced filled lake basin sediments, which show strong climate driven rhythmicity. Source rocks of these two units have relatively high organic matter content and are dominated by type 1 kerogen. Sedimentary and geochemical characteristics indicate there exist persistent lake water stratification and bottom anoxicity during the deposition process. By contrast, the middle E-2-3s(3) is an over filled lake deposit dominated by Uniform mudstones lacking obvious transgressive regressive cycles. It indicates that the lake water lacks stratification, and the bottom water is ventilated. Source rocks of this unit have relatively low organic abundance and are dominated by types II and III kerogen. Thermal evolution Studies show that the upper E-2-3s(4) has a relatively early and multi-stage of hydrocarbon generation process, and can generate immature oils, while the lower E-2-3s(3) and the middle E-2-3s(3) have a relatively late and simple hydrocarbon generation process, and mainly generate mature oils. In addition, the persistent increase of EOM/TOC and total hydrocarbons/TOC indicates that the expelled hydrocarbons from the middle E-2-3s(3) are in relatively small amounts compared C pared with the other two units. The middle E-2-3s(3) acts as i aprocks instead of significant source rocks as previously thought. The viewpoint will be of great significance in future exploration. (C) 2008 Elsevier Ltd. All rights reserved.
机译：研究了渤海湾盆地东营凹陷古新统烃源岩的湖盆演化，微观和有机地球化学特征。上层E-2-3s（4）和下层E-2-3s（3）是平衡的湖盆沉积物，显示出强烈的气候驱动节奏。这两个单元的烃源岩具有相对较高的有机质含量，并以1型干酪根为主。沉积和地球化学特征表明在沉积过程中存在持续的湖水分层和底部缺氧性。相比之下，中部E-2-3s（3）是一个由均匀泥岩控制的充满水的湖泊沉积物，缺乏明显的海侵回归循环。这表明湖水缺乏分层，底部的水被通风了。该单元的烃源岩有机质丰度较低，且以II型和III型干酪根为主。热演化研究表明，上部E-2-3s（4）具有较早期和多阶段的生烃过程，并且可以生成未成熟的油，而下部E-2-3s（3）和中部E- 2-3s（3）的烃生成过程相对较晚且简单，并且主要生成成熟的油。此外，EOM / TOC和总烃/ TOC的持续增加表明，与其他两个单元相比，从C-2-3s（3）中间排出的烃量相对较小。中间的E-2-3s（3）充当了我的顶峰，而不是像以前认为的重要烃源岩。该观点在今后的探索中将具有重要意义。 （C）2008 Elsevier Ltd.保留所有权利。

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