Comprehensive evaluation of the Paleogene lacustrine source rocks within the Bodong Sag, Bohai Bay Basin using kinetics-based petroleum system modeling

IF 1.9 4区 工程技术 Q4 ENERGY & FUELS
Xinyu Yan, Zhenliang Wang, Deying Wang, Feilong Wang, Rongtao Chen, Kuaile Zhang, Xiangnan Yin
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Abstract

The hydrocarbon potential of the Bodong Sag remains unclear. Investigation and comprehensive evaluation of Paleogene lacustrine source rocks is essential to determine the exploration potential and direction. This study examined the Paleogene source rocks using organic geochemical methods, including total organic carbon (TOC), Rock-Eval pyrolysis, maceral composition, vitrinite reflectance (Ro), and kinetic analysis. For the first time in this study area, a three-dimensional (3D) kinetics-based petroleum system modeling approach was employed to reconstruct the burial history, thermal maturity, and hydrocarbon generation history of the source rocks. The resource mass was evaluated based on the calculated generation mass. Results indicate that the third member (E2s3) and first member (E3s1) of the Shahejie Formation are mainly Type II1 organic matter, exhibiting high generation potential. The third member of the Dongying Formation (E3d3) contains mixed Type II1 and II2 organic matter, with moderate potential. The E2s3 and E3s1 source rocks matured early, entering the oil window in the Early Oligocene (∼30.3 Ma) and Middle Oligocene (∼28 Ma), respectively, and are currently in the wet gas to dry gas stage. The E3d3 source rocks matured later, entering the oil window at the end of the Oligocene (∼24.6 Ma) and are currently in the late oil to the wet gas stage. Subsidence and burial have resulted in higher maturity in the southern subsag compared to the northern subsag, with the margins remaining in low maturity to immature stages. Resource estimates for the Bodong Sag source rocks are quantified at 8.33 × 108 t of oil and 1.68 × 1011 m3 of gas. E2s3, E3s1, and E3d3 contribute 41.62%, 33.95%, and 24.43% respectively, with E2s3 source rocks being the major contributor. The southern subsag, accounting for 76.92%, is the primary hydrocarbon generation kitchen. The significant increase in natural gas resources highlights the prospects for natural gas exploration in the Bodong area.
利用基于动力学的石油系统建模综合评价渤海湾盆地博东沙格内的古近纪湖相源岩
博东沙格的碳氢化合物潜力仍不明确。要确定勘探潜力和方向,就必须对古近纪湖沼源岩进行调查和综合评价。本研究采用有机地球化学方法对古近纪源岩进行了研究,包括总有机碳(TOC)、Rock-Eval热解、大体组成、玻璃光泽反射率(Ro)和动力学分析。在该研究区域,首次采用了基于三维动力学的石油系统建模方法来重建源岩的埋藏历史、热成熟度和碳氢化合物生成历史。根据计算得出的生成量对资源量进行了评估。结果表明,沙河街地层第三系(E2s3)和第一系(E3s1)主要为 II1 型有机质,具有较高的生成潜力。东营地层第三系(E3d3)含有 II1 型和 II2 型混合有机质,生成潜力中等。E2s3和E3s1源岩成熟较早,分别于早渐新世(30.3Ma∼)和中渐新世(28Ma∼)进入石油窗口,目前处于湿气到干气阶段。E3d3源岩成熟较晚,在渐新世末期(∼24.6 Ma)进入石油窗口,目前处于晚期石油至湿气阶段。由于沉降和埋藏,南部亚岩层的成熟度比北部亚岩层高,边缘仍处于低成熟至不成熟阶段。博东萨格源岩的资源量估计为 8.33 × 108 吨石油和 1.68 × 1011 立方米天然气。E2s3、E3s1 和 E3d3 分别占 41.62%、33.95% 和 24.43%,其中 E2s3 源岩是主要来源。南部子岩占 76.92%,是主要的碳氢化合物生成厨房。天然气资源的大幅增加凸显了博东地区天然气勘探的前景。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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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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