开放体系腐殖质煤与腐殖质煤有机质演化及生烃特征

IF 5.8 2区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Analytical and Applied Pyrolysis Pub Date : 2025-02-12 DOI:10.1016/j.jaap.2025.107026

Daming Niu , Pingchang Sun , Yang Wang , Hongliang Dang , Zhisheng Luan , Yueyue Bai

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引用次数: 0

摘要

不同有机质类型的未熟煤在成熟过程中，其生烃演化过程存在差异。然而，这些差异以及残余烃对煤生烃潜力的影响却鲜有研究。本研究选取腐泥腐殖质煤和腐泥腐殖质煤进行热模拟实验，获得可萃取有机质（EOM）。通过总有机碳（TOC）测定、Rock-Eval热解等实验，定量测定腐泥腐殖质煤和腐泥腐殖质煤的生排烃潜力。在热演化过程中，煤的碳富集效应影响了TOC的变化。开放排烃环境表明腐腐泥煤容易生油，腐腐泥腐殖质煤既产油又产气。我们认为煤中残余沥青是煤高成熟至过成熟阶段煤层气的来源，初步确定煤在快速加热条件下的最佳生烃温度为475 ℃。

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Evolution of organic matter and hydrocarbon-generating characteristics of sapropelic humic coal and humosapropelic in open systems

During their maturation, immature coals with different organic matter (OM) types exhibit differences in their hydrocarbon-generating evolution processes. However, these differences and the impact of residual hydrocarbons on the hydrocarbon-generating potential of coal have rarely been studied. Sapropelic humic coal and humosapropelic coal were selected for the thermal simulation experiments in this study, and extractable organic matter (EOM) was obtained. The hydrocarbon generation and expulsion potential of sapropelic humic coal and humosapropelic coal were quantitatively determined through total organic carbon (TOC) measurements, Rock-Eval pyrolysis and other experiments. We found that the carbon accumulation effect of coal influences changes in TOC during the thermal evolution process. An open hydrocarbon expulsion environment revealed that humosapropelic coal was prone to generating oil, whereas sapropelic humic coal produced both oil and gas. We believe that the residual bitumen in coal is the source of coalbed methane in highly mature to overmature coal stages, and we preliminarily determined that the optimal temperature for coal hydrocarbon generation under rapid heating is 475 °C.

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来源期刊

Journal of Analytical and Applied Pyrolysis 化学-分析化学

CiteScore

9.10

自引率

11.70%

发文量

340

审稿时长

44 days

期刊介绍： The Journal of Analytical and Applied Pyrolysis (JAAP) is devoted to the publication of papers dealing with innovative applications of pyrolysis processes, the characterization of products related to pyrolysis reactions, and investigations of reaction mechanism. To be considered by JAAP, a manuscript should present significant progress in these topics. The novelty must be satisfactorily argued in the cover letter. A manuscript with a cover letter to the editor not addressing the novelty is likely to be rejected without review.