中国松辽盆地青山口地层第一层古环境演化及有机质富集机制

IF 1.8 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY
Ying Li, Min Wang, Yu Yan, Xin Wang, Jinyou Zhang, Xuefeng Bai, Yuchen Zhang, Jiaheng Xue, Junsheng Fei, Lianbin Zhang, Guojun Wang
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引用次数: 0

摘要

有机质是油气生成的基础,而沉积环境则控制着有机质的富集。松辽盆地青山口组(K2qn1)第一层具有较厚的富有机质页岩,是页岩油勘探开发的重要目标层段。在古龙沙格,对该单元的页岩样品进行了全断面采集。通过利用岩性特征、薄片观察、元素组成和有机碳浓度,对 K2qn1 的沉积环境(EOD)特征进行了改进。结合本文提出的归一化系数,建立了有机质相关模型,以阐明影响有机质富集的因素。从 K2qn1 的底部到顶部,湖深逐渐变浅,初级生产力先下降后上升,还原条件先强后弱,水体盐度逐渐降低,气候先半湿润后温暖湿润,土著碎屑输入先减少后增加。K2qn1's底部的一次大的海洋断陷带来了营养物质,提高了初级生产力,密度分层的还原环境保存并丰富了有机物。在 K2qn1 沉积的中期,初级生产力较高,而土著输入量较低。有机质在还原的深湖环境中得以保存,形成了富含有机质的黑色页岩。湖水变浅,K2qn1 上部的盐度降低。底栖生物迅速繁殖,消耗了大量氧气,破坏了之前的沉积环境,形成了受底栖生物干扰的还原环境,保存条件差,有机质含量最低。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Paleoenvironment evolution and organic matter enrichment mechanisms in the first member of the Qingshankou Formation, Songliao Basin, China

Organic matter is the basis for oil and gas generation, and the depositional environment controls its enrichment. The first member of the Qingshankou Formation (K2qn1) in Songliao Basin has a thick organic-rich shale and so is an important target section for shale oil exploration and development. In the Gulong Sag, shale samples from this unit were collected over the full length of the section. The characterization of the environments of deposition (EOD) of K2qn1 was improved by utilizing lithological characteristics, thin section observations, elemental compositions, and organic carbon concentrations. Combined with the normalization coefficients proposed in this paper, an organic matter correlation model was established to elucidate the factors that influence organic matter enrichment. From the bottom to the top of K2qn1, the lake depth gradually becomes shallower, the primary productivity first decreases and then increases, the reducing conditions become stronger and then weaker, the water salinity gradually decreases, the climate first becomes semi-humid and then warm and humid, and the input of terrigenous debris first decreases and then increases. A major marine transgression at the base of the K2qn1’s brought in nutrients to increase primary productivity, and the density-stratified reducing environment preserved and enriched organic matter. High primary productivity occurred during the middle of the deposition of the K2qn1, while terrigenous input is low. Organic matter is preserved in reduced deep lake environments, resulting in organic matter-rich black shale. The lake became shallower, and the salinity decreased in the upper part of K2qn1. Benthic organisms rapidly multiplied, consuming large amounts of oxygen and destroying the previously depositional environment, resulting in a reducing environment disturbed by benthic organisms with poor preservation conditions and the lowest organic matter content.

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来源期刊
Frontiers of Earth Science
Frontiers of Earth Science GEOSCIENCES, MULTIDISCIPLINARY-
CiteScore
3.50
自引率
5.00%
发文量
627
期刊介绍: Frontiers of Earth Science publishes original, peer-reviewed, theoretical and experimental frontier research papers as well as significant review articles of more general interest to earth scientists. The journal features articles dealing with observations, patterns, processes, and modeling of both innerspheres (including deep crust, mantle, and core) and outerspheres (including atmosphere, hydrosphere, and biosphere) of the earth. Its aim is to promote communication and share knowledge among the international earth science communities
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