东营凹陷FY1井沙三下亚段陆相深水细粒沉积岩Milankovitch旋回及其页岩油勘探意义

IF 1.9 4区 工程技术 Q4 ENERGY & FUELS Energy Exploration & Exploitation Pub Date : 2023-06-19 DOI:10.1177/01445987231181721
Wei Wu, Lin Zhang, Yibo Qiu, Guangxu Wang, Jing Yu
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引用次数: 0

摘要

中国最近在开采页岩油气资源方面遇到了重大困难。制约中国页岩油勘探突破的一个重要地质障碍是对生产油气藏和理想储层的准确识别。因此,研究页岩储层的性质至关重要。在岩心、地球化学分析和伽马测井资料的基础上,利用Milankovitch旋回对东营凹陷FY1井下段深水细粒沉积岩进行了分析。结果表明:(1)东营凹陷FY1井es3段保存了完整的Milankovitch旋回,405 ka的长偏心率和23.2 ka的旋进旋回是控制沉积的关键因素。(2)采用“三端元法”划分出8种不同类型的岩相。这些岩相的纵向变化主要是由有机块状灰色泥岩到有机片层状泥质泥岩,再到有机块状灰色泥岩到有机片层状灰色泥岩再到有机片层状灰色泥岩。从浅到深再到深,整个水深起伏不定。(3)四个较长的偏心周期中,每一个都有一个半周期的温暖潮湿天气和寒冷干燥天气。分析了高偏心率和小偏心率对岩相和有机质含量的影响。通过研究细粒沉积岩对偏心率和进动期的响应,提出了在温暖、潮湿、干燥和寒冷气候条件下生物物质富集的假设。偏心率越大,越适合储存页岩油。
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Milankovitch cycle of continental deep-water fine-grained sedimentary rocks in the lower submember of Es3 of Well FY1 in Dongying Sag and its significance for shale oil exploration
China has recently faced significant difficulties in the exploitation of its shale oil and gas resources. An essential geological obstacle preventing the breakthrough of Chinese shale oil exploration is the precise identification of productive oil and gas pools and ideal formation. Therefore, it is crucial to examine the properties of shale reservoirs. Deep-water fine-grained sedimentary rocks in the lower member of the Well FY1 in Dongying Sag are analyzed using the Milankovitch cycle based on core, geochemical analysis, and gamma logging data. The findings demonstrate that: (1) The entire Milankovitch cycle is preserved in the Es3x of Well FY1 in Dongying Sag, and that the long Eccentricity of 405 ka and the Precession cycle of 23.2 ka are the key controlling factors in the deposition. (2) The “three-end-member” method is used to divide eight different types of lithofacies. The main vertical changes in these lithofacies are from organic massive gray mudstone to organic lamellar callitic mudstone to organic massive gray mudstone to organic lamellar gray mudstone to organic lamellar gray mudstone and back again. From shallow to deep to deeper, the entire water depth fluctuated. (3) Each of the four lengthy Eccentricity cycles has a half-cycle of warm, humid weather and cold, dry weather. Analysis was done on how the lithofacies and organic matter concentration changed with high and small eccentricities. The enrichment of biological materials in warm, wet, dry, and cold climates was hypothesized by examining the response of fine-grain sedimentary rocks to eccentricities and Precession periods. Larger Eccentricity is thought to be more suitable for storing shale oil.
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来源期刊
Energy Exploration & Exploitation
Energy Exploration & Exploitation 工程技术-能源与燃料
CiteScore
5.40
自引率
3.70%
发文量
78
审稿时长
3.9 months
期刊介绍: Energy Exploration & Exploitation is a peer-reviewed, open access journal that provides up-to-date, informative reviews and original articles on important issues in the exploration, exploitation, use and economics of the world’s energy resources.
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