渤海湾盆地黄骅坳陷石炭系—二叠系煤系烃源岩生烃特征研究

doi:10.3969/j.issn.1006-6535.2023.04.003

摘要/Abstract

摘要： 近年来,渤海湾盆地探明数个石炭系—二叠系煤系烃源岩供烃的凝析油气藏,展现出可观的勘探潜力。针对研究区烃源岩生烃特征认识不清、勘探方向不明的问题,亟需重新认识煤系烃源岩的供烃能力。为此,以渤海湾盆地黄骅坳陷为研究对象,通过岩心、测井、录井、试油等多元数据统计,基于盆地内构造单元沉积充填特征差异分析,运用盆地数值模拟技术建立沉积单元评价模型,开展黄骅凹陷煤系烃源岩不同岩层的空间展布、生烃潜力与生烃特征综合分析,明确了渤海湾盆地石炭系—二叠系煤系烃源岩生烃模式,并预测了研究区潜山油气有利聚集带。结果表明:黄骅坳陷石炭系—二叠系煤系烃源岩以煤岩为标志层,发育泥岩、炭质泥岩与煤岩3种生烃岩性,其中,泥岩厚度大,连续性强,生烃潜力大;生烃模拟表明,一次生烃以泥岩生油为主,二次生烃以多种烃源岩混合生油生气为主;发育早期沉降型、晚期沉降型与持续沉降型3类生烃模式,持续沉降型与晚期沉降型生烃区对潜山原地油气聚集最为有利。研究成果可为研究区煤系烃源岩供烃的油气成藏理论研究与勘探部署提供技术支撑。

关键词: 煤系烃源岩, 生烃特征, 石炭系—二叠系, 黄骅坳陷, 渤海湾盆地

Abstract: In recent years, several condensate reservoirs supplied with hydrocarbons from Carboniferous-Permian coal-measure source rocks have been identified in the Bohai Bay Basin, showing considerable exploration potential. To address the problems of poorly understood hydrocarbon generation characteristics and unclear exploration directions in the study area, it is urgent to reconceptualize the hydrocarbon supply capacity of coal-measure source rocks. To this end, the Huanghua Depression in the Bohai Bay Basin was taken as the research object, and the spatial distribution, hydrocarbon generation potential and hydrocarbon generation characteristics of different lithologies of coal-measure source rocks in the Huanghua Depression were comprehensively analyzed through multivariate data statistics such as cores, well logging, mud logging and oil production testing, based on the analysis of the difference of sedimentary filling characteristics of tectonic units in the basin, and the evaluation model of sedimentary units established by using the numerical simulation technology for the basin.The hydrocarbon generation pattern of Carboniferous-Permian coal-measure source rocks in the Bohai Bay Basin was clarified, and a favorable hydrocarbon accumulation zone in the study area was predicted. The result shows that for the Carboniferous-Permian coal-measure source rocks in the Huanghua Depression, the coal rock is the marker bed, and three types of hydrocarbon generation lithologies are developed: mudstone, carbonaceous mudstone and coal rocks, among which the mudstone is thick and continuous with high hydrocarbon generation potential; the hydrocarbon generation simulation shows that the primary hydrocarbon generation is dominated by oil production from mudstone, and the secondary hydrocarbon generation is dominated by mixed oil and gas production from various hydrocarbon source rocks; three types of hydrocarbon generation patterns are developed: early subsidence type, late subsidence type and continuous subsidence type, and the hydrocarbon generation areas of continuous subsidence and late subsidence types are the most favorable for in-situ oil and gas accumulation in the buried hill. The results of the study can provide technical support and data for theoretical research and exploration deployment of oil and gas accumulation by hydrocarbon supply from coal-measure source rocks in the study area.

Key words: coal-measure source rocks, hydrocarbon generation characteristics, Carboniferous-Permian, Huanghua Depression, Bohai Bay Basin

中图分类号:

TE122.1

王鑫, 李政, 朱日房, 黎萍, 王茹, 牛子铖, 楼达. 渤海湾盆地黄骅坳陷石炭系—二叠系煤系烃源岩生烃特征研究[J]. 特种油气藏, 2023, 30(4): 19-27.

Wang Xin, Li Zheng, Zhu Rifang, Li Ping, Wang Ru, Niu Zicheng, Lou Da. Study on Hydrocarbon Generation Characteristics of Carboniferous-Permian Coal-measure Source Rocks in Huanghua Depression, Bohai Bay Basin[J]. Special Oil & Gas Reservoirs, 2023, 30(4): 19-27.

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