地堑型湖盆陡坡带深水细粒沉积岩的分布特征及其油气意义:中国渤海湾盆地济阳凹陷Es3l亚成岩实例研究

IF 2.2 4区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
Minerals Pub Date : 2024-08-29 DOI:10.3390/min14090882
Qi Zhong, Wangpeng Li, Hui Huang, Jianhui Jiang, Jianguo Zhang, Pinxie Li, Yali Liu, Jiabin Wu, Fenghua Wang, Bintian Tan, Ruo Jia
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引用次数: 0

摘要

中国渤海湾盆地济阳凹陷早期的高勘探开发生产能力证实了研究区页岩油巨大的勘探开发潜力。由于研究区沉积机理复杂,细粒沉积岩分布规律不甚明了,制约了进一步的勘探突破。本文通过对岩心和薄片的综合观察,结合矿物组分、Rock-Eval热解、岩切测井和测井资料对岩性进行了划分,明确了各种岩性的分布规律。研究结果表明,根据岩性特征,可将各种岩性的成因分为陆生、混合和内生三类,并划分出六种岩性类型:陆源低有机质块状粉砂岩(LF1)、陆源低有机质块状泥岩(LF2)、混合源中有机质块状泥岩(LF3)、混合源中-高有机质层状块状泥岩(LF4)、混合源中-高有机质层状泥岩(LF5)和内源中-高有机质层状灰岩(LF6)。岩性在平面上的分布呈东西对称、带状分布的特征;在剖面上的分布则表现出稳定的沉积过程和连续的沉积序列。总结了各种岩性的沉积模式;北部陡坡带的土著输入影响了湖盆的水动力条件,显著影响了陡坡带至深陷区的岩性沉积变化。对各岩性进行了地质评价,LF1 + LF4 + LF5 被列为页岩油开发的一级目标储层,LF3 + LF6 被视为二级有利储层。研究结果为地堑湖盆细粒沉积岩岩相划分及分布特征、页岩油藏甜点评价提供了参考。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Distribution Characteristics and Hydrocarbon Significance of Deep-Water Fine-Grained Sedimentary Rocks in the Steep-Slope Zone of a Graben Lake Basin: A Case Study of Es3l sub-Member in the Jiyang Depression, Bohai Bay Basin, China
The high exploration and development production capacity of the Jiyang Depression, Bohai Bay Basin, China in the early stage confirms the huge exploration and development potential of shale oil in the study area. Due to the complexity of the depositional mechanism in the study area, the distribution law of fine-grained sedimentary rocks is not well understood, which restricts further exploration breakthroughs. This paper comprehensively observes rock cores and thin sections, combines mineral components, Rock-Eval pyrolysis, rock-cutting logging and logging data to classify lithofacies, and clarifies the distribution law of various lithofacies. The research results show that, according to lithological characteristics, various lithofacies origins are classified into three categories: terrigenous, mixed, and endogenous sources, and six lithofacies types are distinguished: terrigenous low-organic-matter massive siltstone (LF1), terrigenous low-organic-matter massive mudstone (LF2), mixed-source medium-organic-matter massive mudstone (LF3), mixed-source medium-to-high-organic matter laminated-massive mudstone (LF4), mixed-source medium-to-high-organic-matter laminated mudstone (LF5), and endogenous-sourced medium-to-high-organic matter laminated limestone (LF6). The distribution of lithofacies in plane is symmetrical in the east–west direction and is characterized by a banded distribution; the distribution in profile shows a stable depositional process and a continuous depositional sequence. The various lithofacies depositional models have been summarized; the terrigenous input from the northern steep-slope zone has influenced the hydrodynamic conditions of the lake basin, significantly affecting the lithofacies depositional variations from the steep-slope zone to the deep-sag area. The geological evaluation of each lithofacies has been conducted; LF1 + LF4 + LF5 are classified as Class I—target reservoirs for shale oil development, while LF3 + LF6 are considered Class II—favorable reservoirs. The result of the study provide a reference for the classification of fine-grained sedimentary-rock facies and distribution characteristics, and the evaluation of shale-oil-reservoir sweet spots in graben lake basins.
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来源期刊
Minerals
Minerals MINERALOGY-MINING & MINERAL PROCESSING
CiteScore
4.10
自引率
20.00%
发文量
1351
审稿时长
19.04 days
期刊介绍: Minerals (ISSN 2075-163X) is an international open access journal that covers the broad field of mineralogy, economic mineral resources, mineral exploration, innovative mining techniques and advances in mineral processing. It publishes reviews, regular research papers and short notes. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. There is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced.
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