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Kinetics of early methane generation from Green River shale

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Chinese science Bulletin 1998年第22期43卷 1908-1912页

作者： liu jinzhong\+1 and tang yongchun 2 1. {4. of organic geochemistry, guangzhou institute of geochemistry, Chinese academy of sciences, guangzhou 51064., china 2. Chevron Petroleum Technology Company, CA 90633, USA Laborarory of organic geochemistry Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou China Chevron Petroleum Technology Company USA

During oil/gas exploration in an area, there is a question as to whether methane in the strata was generated \%in situ\% mainly by thermal degradation of local organic matter. The key to the question is whether the kerogen could produce methane of more than 80 mL/g TOC, when its \%R\%\-o increased from initial (0.36%) to current value of 0.70% during thermal evolution. The authors have made efforts to answer this question by the kinetics method. First, a series of pyrolysis experiments were carried out to obtain data of methane yield and \%R\%\-o evolution, from which kinetic parameters of methane and \%R\%\-o were derived; then these parameters were extrapolated to the geological condition and finally, a methane yield, 96 mL/g TOC, was predicted. The result suggests that from the view of hydrocarbon generation, methane in the seam should be from thermal degradation of local kerogen.

关键词： methane kinetics pyrolysis organic geochemistry.

The generation and accumulation of natural gas from Yinan 2 gas pool in Kuqa Depression

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Chinese science Bulletin 2004年第S1期49卷 107-114页

作者： LI Xianqing XIAO Xianming tang yongchun XIAO Zhongyao Ml Jingkui liu Dehan SHEN Jiagui liu {4. The state key laboratory of organic {4. Guangzhou Institute of GeochemistryChinese Academy of SciencesGuangzhou 510640China key laboratory of Coal Resources Ministry of EducationChina University of Mining and TechnologyBeijing 100083China The Research Center of Petroleum Energy and Environment California Engineer and Technology College21910 Currier RdWalnutCA 61769USA Research institute of Exploration and Development Tarim Oil Field Sub-CompanyPetroChinaKorla 841000China

By using the methods of hydrocarbon generation kinetics and carbon isotope kinetics, combined with geological background of natural gas pool formation, the generation and accumulation of natural gas from Yinan 2 gas pool was studied in Kuqa Depression of the Tarim Basin. Natural gas of Yinan 2 gas pool is mainly derived from Middle and Lower Jurassic coal-bearing source rocks, and generally belongs to long time-accumulated gas. It is suggested that Yinan 2 gas is chiefly accumulated in the last 5 Ma, its Ro ranges from 1.25% to 1.95%, and the loss rate of natural gas is about 25%-30%. This work not only complements and reduces the deficiency of formation model of natural gas pools which traditionally depends on the matching relationships between source rock, reservoir, cap rock, and trap, but also is a useful reference in the study of other gas pools.

关键词： natural gas formation hydrocarbon generation kinetics carbon isotope source rock Yinan 2 gas pool Kuqa Depression.

The generation kinetics of natural gases in the Kela-2 gas field from the Kuqa Depression, Tarim Basin, northwestern china

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Chinese Journal Of geochemistry 2013年第2期32卷 157-169页

作者： LI Xianqing FENG Songbao XIAO Xianming tang yongchun XIAO Zhongyao MI Jingkui TIAN Hui liu Dehan SHEN Jiagui state key laboratory of Coal Resources and Safe Mining China University of Mining and Technology state key laboratory of organic {4. Guangzhou Institute of Geochemistry Chinese Academy of Sciences Environmental and Energy Research Center California Institute of Technology 738 Arrow Grand Circle Covina California 91722 USA Power Research institute of Exploration and Development Tarim Oilfield CompanyPetroChina Research institute of Petroleum Exploration and Development PetroChina

The Kela-2 gas field, found in the Kuqa Depression of the Tarim Basin, northwestern china, is a large-sized dry gas field (C1 /C1-5 =0.992 0.999) and characterized by ultra-high pressure (pressure factor up to 2.0 2.2). The pyrolysis experiment was carried out under isothermal gold-tube closed system, with samples collected from the Jurassic coal, Jurassic mudstone and Triassic mudstone in the Kuqa Depression. The result of gas yield showed that the Middle and Lower Jurassic source rocks have higher gas generation potential than the Triassic source rocks. The kinetic modeling of gas generation and methane carbon isotope fractionation suggested that the Kela-2 gases belong to the products of high-over mature stages and were mainly derived from the Middle and Lower Jurassic coal-bearing strata. The Triassic source rocks made a minor contribution to the Kela-2 gases. The Kela-2 gases chiefly generated from coal-bearing source rocks with R o values from 1.3% to 2.5%, and thus primarily accumulated after 5 Ma.

关键词：克拉2气田塔里木盆地中国西北部天然气产量动力学建模库车坳陷煤系烃源岩含煤地层

Kinetic Parameters of Methane Generated from Source Rocks in the Kuqa Depression of Tarim Basin and Their Application

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Acta Geologica Sinica(English Edition) 2008年第1期82卷 154-163页

作者： LI Xianqing XIAO Xianming MI Jingkui tang yongchun XIAO Zhongyao liu Dehan SHEN Jiagui YANG Yunfeng WANG Yan DONG Peng state key laboratory of organic {4. Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou 510640 China state key laboratory of Coal Resources and Safe Mining China University of Mining and Technology Beijing 100083 China Research Center of Petroleum Energy and Environment California Institute of Technology 21910 Currier Rd Walnut CA 61769 USA Research institute of Exploration and Development Tarim Oil Field Company PetroChina Korla Xinjiang 841000 China

In a thermal simulation experiment of gold tubes of closed-system, calculating with the KINETICS and GOR-ISOTOPE KINETICS software, kinetic parameters of gas generation and methane carbon isotopic fractionation from Triassic-Jurassic hydrocarbon source rocks in the Kuqa depression of Tarim Basin are obtained. The activation energies of methane generated from Jurassic coal, Jurassic mudstone and Triassic mudstone in the Kuqa Depression are 197-268 kJ/mol, 180-260 kJ/mol and 214.289 kJ/mol, respectively, and their frequency factors are 5.265×10^13 s^-1, 9.761×10^11 s^-1 and 2.270×10^14.s^-1. This reflects their differences of hydrocarbon generation behaviors. The kinetic parameters of methane carbon isotopic fractionation are also different in Jurassic coal, Jurassic mudstone and Triassic mudstone, whose average activation energies are 228 kJ/mol, 205 kJ/mol and 231 kJ/mol, respectively. Combined with the geological background, the origin of natural gas in the Yinan-2 gas pool is discussed, and an accumulation model of natural gas is thus established. The Yinan- 2 gas is primarily derived from Jurassic coal-bearing source rocks in the Yangxia Sag. Main gas accumulation time is 5-0 Ma and the corresponding Ro is in the range from 1.25 %-1.95 %. The loss rate of natural gas is 25 %-30 %.

关键词： hydrocarbon source rock methane generation carbon isotopic fractionation kinetics Kuqa Depression Tarim Basin

Oil cracking to gases: Kinetic modeling and geological significance

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Chinese science Bulletin 2006年第22期51卷 2763-2770页

作者： TIAN Hui 1,2 WANG Zhaoming XIAO Zhongyao LI Xianqing XIAO Xianming state key laboratory of organic {4. Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou 510640 China Graduate School of the Chinese academy of sciences Beijing 100049China Tarim Oil Field Company Korla 841000 China key laboratory of Coal Resources Ministry of Education ChinaUniversity of Mining and Technology Beijing 100083 China

从 Tarim 盆的 LN14.的一件三叠纪的油样品是用在在 50 MPa 的恒压下面的 200-620 deg C 的封上的金试管的 pyrolyzed。气体并且剩余可溶的烃被分析。结果证明到气体的石油的裂化能被划分成二个不同阶段：从液体油的全部的 C1-5 气体的... 详细信息

从 Tarim 盆的 LN14.的一件三叠纪的油样品是用在在 50 MPa 的恒压下面的 200-620 deg C 的封上的金试管的 pyrolyzed。气体并且剩余可溶的烃被分析。结果证明到气体的石油的裂化能被划分成二个不同阶段：从液体油的全部的 C1-5 气体的主要产生由 C2-5 烃和 secondary 或到甲烷的 C2-5 气体的进一步的裂开的优势描绘了导致气体的进步的干的 andcarbon 富有的事。基于试验性的数据，运动参数为主要产生和第二等的石油的裂化裂化气被决定并且外推到地质的条件预言热稳定性和原油的裂开的程度。最后，为原油的热破坏的一个进化模型被建议，它到油裂化气的迁居和累积的含意被讨论。

关键词：石油裂化动态建模石油热稳定性气体积累