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沧东凹陷孔二段页岩生排烃效率及对含油性的影响
冯家乐1,2,杨升宇1,2,胡钦红1,2,马斌玉3,文家成1,2,王旭阳1,2,蒲秀刚4,韩文中4,张伟4
(1.中国石油大学(华东)深层油气全国重点实验室,山东青岛 266580;2.中国石油大学(华东)地球科学与技术学院, 山东青岛 266580;3.长江大学地球科学学院,湖北武汉 430100;4.中国石油大港油田公司,天津 300280)
摘要:
渤海湾盆地沧东凹陷孔二段页岩油资源潜力巨大,且通过水平井钻控获得了稳产工业油流。应用常规热解和分步热解技术,优化生排烃物质平衡法,提出了基于原始生烃潜力和现今残余生烃潜力的页岩生烃和排烃效率氢指数平衡计算方法,并探索成熟度以外孔二段页岩排烃效率的主控因素及其与含油性的关系。选取深度和成熟度较为接近的样品,以排除成熟度这一公认的生排烃效率指标的影响。结果表明,页岩有机质丰度和类型、微观孔隙结构和岩石类型等是控制其生排烃效率的重要因素。Ⅲ型干酪根产物以轻烃为主,排烃效率变化大且普遍高于Ⅰ型和Ⅱ型干酪根。Ⅰ型和Ⅱ型干酪根在TOC超过3%以后,排烃效率随TOC的增加而增大。墨水瓶型孔对液态烃的滞留能力强于狭缝型孔;对气态烃而言墨水瓶型孔反而是利于排烃的优势通道。纹层状页岩比薄层状页岩具有更低的排烃效率。生排烃共同控制着页岩的含油量,页岩中含油量与排烃效率整体呈负相关,但与生烃潜力、生烃效率和滞留烃率的乘积呈明显的正相关性,展示了生排烃效率计算方法的可靠性和实用性。
关键词:  沧东凹陷  孔二段  页岩油  排烃效率  含油量  生烃潜力平衡法
DOI:10.3969/j.issn.1673-5005.2024.02.005
分类号::TE 122.3
文献标识码:A
基金项目:国家自然科学基金重点项目(41830431); 山东省青年基金项目(ZR2021QD092)
Hydrocarbon generation and expulsion efficiency and influence on oil bearing property of shale in the second member of Paleogene Kongdian Formation in Cangdong Sag
FENG Jiale1,2, YANG Shengyu1,2, HU Qinhong1,2, MA Binyu3, WEN Jiacheng1,2, WANG Xuyang1,2, PU Xiugang4, HAN Wenzhong4, ZHANG Wei4
(1.National Key Laboratory of Deep Oil and Gas in China University of Petroleum(East China), Qingdao 266580, China;2.School of Geosciences in China University of Petroleum (East China), Qingdao 266580, China;3.College of Earth Sciences, Yangtze University,Wuhan 430100, China;4.PetroChina Dagang Oilfield Company, Tianjin 300280, China)
Abstract:
The shale oil potential of the second member of Kongdian Formation in Cangdong Sag, Bohai Bay Basin, is substantial, with stable industrial oil flow achieved through horizontal well drilling and control. In this paper, the routine rock-eval pyrolysis and shale play rock-eval pyrolysis techniques are utilized to optimize the hydrocarbon generation and expulsion mass balance method. A hydrogen index balance calculation method for shale hydrocarbon generation and expulsion efficiency, based on both the original and residual hydrocarbon generation potential, is proposed. Investigating the primary controlling factors, aside from maturity, on hydrocarbon expulsion efficiency in the shale,sheds light on the relationship between hydrocarbon expulsion efficiency and oil bearing property. In this study, samples with similar depth and maturity are selected to exclude the influence of maturity variation, a recognized indicator of hydrocarbon generation and expulsion efficiency. The results show the significance of organic matter abundance and type, pore structures, and rock types as key factors controlling hydrocarbon generation and expulsion efficiency in the shale of the second member of the Paleogene Kongdian Formation in Cangdong Sag. The products of type Ⅲ kerogen are mainly light hydrocarbons, exhibiting considerable variation in hydrocarbon expulsion efficiency, generally higher than that of type Ⅰ and type Ⅱ kerogen. When the TOC content of type Ⅰ and type Ⅱ kerogen exceeds 3%, hydrocarbon expulsion efficiency increases with TOC. Ink-bottle pores exhibit stronger retention of liquid hydrocarbons compared to slit pores.But for gaseous hydrocarbons, ink-bottle pores are the dominant channel to expel hydrocarbon. Additionally, laminated shale demonstrates lower hydrocarbon expulsion efficiency than thin laminated shale. The total oil content in shale is the outcome of co-controlled generation and expulsion of hydrocarbons. It shows a negative correlation with hydrocarbon expulsion efficiency, but a significant positive correlation with the product of hydrocarbon generation potential, hydrocarbon generation efficiency, and hydrocarbon retention rate, affirming the reliability and practicality of the proposed calculation method of hydrocarbon expulsion efficiency.
Key words:  Cangdong sag  the second member of Paleogene Kongdian Formation  shale oil  hydrocarbon expulsion efficiency  total oil content  hydrocarbon generation potential balance method
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