湖相页岩液态烃对页岩吸附气实验的影响——以鄂尔多斯盆地延长组页岩为例

刘国恒; 黄志龙; 姜振学; 陈践发; 陈斐然; 邢金艳

doi:10.11781/sysydz201505648

湖相页岩液态烃对页岩吸附气实验的影响——以鄂尔多斯盆地延长组页岩为例

doi: 10.11781/sysydz201505648

1.
中国石油大学油气资源与探测国家重点实验室, 北京 102249
2. 中国石油大学非常规天然气研究院, 北京 102249

基金项目: 国家自然科学基金项目"湖相富有机质页岩自生石英形成及其页岩油地质意义"(41272156)资助。

详细信息

作者简介:
刘国恒(1988—),男,博士研究生,从事油气藏形成与分布研究。E-mail:liuguoheng123@sina.cn。

通讯作者:
黄志龙(1962—),男,教授,博士生导师,从事石油地质研究。E-mail:huang5288@163.com。

中图分类号: TE135
计量
- 文章访问数: 1106
- HTML全文浏览量: 53
- PDF下载量: 1222
- 被引次数: 0
出版历程
- 收稿日期: 2014-08-12
- 修回日期: 2015-07-21
- 刊出日期: 2015-09-28

Effect of liquid hydrocarbons on gas adsorption in alacustrine shale: A case study of the Yanchang Formation, Ordos Basin

1.
State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing 102249, China
2. Unconventional Natural Gas Institute, China University of Petroleum, Beijing 102249, China

摘要

摘要: 通过全岩和黏土矿物X-衍射、索氏抽提、离子抛光、扫描电镜、低温氮气吸附、等温吸附等实验分析,研究了鄂尔多斯盆地延长组湖相页岩储层中的液态烃对吸附气含量的影响。结果表明,延长组湖相页岩储层正处于中成岩阶段A期;有机质演化程度相对较低,不足以形成大量的有机质孔隙,却足以形成大量的液态烃,液态烃占据了页岩中直径约4 nm左右的孔隙。由于氮气不溶于液态烃,而甲烷易溶解于液态烃,使得抽提前后样品低温氮气吸附实验得到的比表面积和吸附量变化大,但抽提前后样品等温吸附实验测得的甲烷"吸附"量变化不大,这表明等温吸附实验中有一部分甲烷以溶解态赋存于页岩样品中。因此在用等温吸附实验研究低成熟度页岩吸附气含量的过程中,必须注意液态烃的影响。
- 液态烃 /
- 吸附气 /
- 甲烷溶解 /
- 低成熟度页岩 /
- 延长组 /
- 鄂尔多斯盆地
Abstract: The effect of liquid hydrocarbons on the gas adsorption capacity of lacustrine shales from the Yanchang Formation in the Ordos Basin has been studied using a series of integrated experimental methods including X-ray diffraction of bulk and clay minerals, Soxhlet extraction, focused ion beam scanning electron microscopy(FIB-SEM), low-temperature N₂ adsorption and high-pressure CH₄ adsorption methods.The results show that the lacustrine shale from the Yanchang Formation is in the middle diagenetic stage A.The thermal maturity is relatively low, and contributes to the absence of organic matter pores.However, it is sufficiently high enough forthe production of liquid hydrocarbons which can block up pores with a diameter of 4 nm.Methane can dissolve in these liquid hydrocarbon, whereas nitrogen cannot.As a result, the specific area and adsorbed capacity acquired in low-temperature N₂ adsorption analysis show great differences between samples before and after extraction.However, the difference does not exist in the CH₄ adsorption analysis.This means that a certain proportion of CH₄ exists in these samples in a dissolved form.It is necessary to pay attention to free hydrocarbons during studies of gas adsorption capacity of shales with low thermal maturity usinghigh pressure CH₄ adsorption methods.
- liquid hydrocarbons /
- adsorbed gas /
- methane dissolution /
- shale with low thermal maturity /
- Yanchang Formation /
- Ordos Basin

HTML全文

参考文献(25)

[1]	邹才能.非常规油气地质[M].2版.北京:地质出版社,2013.Zou Caineng.Unconventional petroleum geology[M].2nd ed.Beijing:Geological Publishing House,2013.
[2]	Curtis J B.Fractured shale-gas systems[J].AAPG Bulletin,2002,86(11):1921-1938.
[3]	Wang C C,Juang L C,Lee C K,et al.Effects of exchanged surfactant cations on the pore structure and adsorption characteristics of montmorillonite[J].Journal of Colloid and Interface Science,2004,280(1):27-35.
[4]	Aringhieri R.Nanoporosity characteristics of some natural clay mine-rals and soils[J].Clays and Clay Minerals,2004,52(6):700-704.
[5]	Ross D J K,Bustin R M.The importance of shale composition and pore structure upon gas storage potential of shale gas reservoirs[J].Marine and Petroleum Geology,2009,26(6):916-927.
[6]	吉利明,邱军利,夏燕青,等.常见黏土矿物电镜扫描微孔隙特征与甲烷吸附性[J].石油学报,2012,33(2):249-256.Ji Liming,Qiu Junli,Xia Yanqing,et al.Micro-pore characteristics and methane adsorption properties of common clay minerals by electron microscope scanning[J].Acta Petrolei Sinica,2012,33(2):249-256.
[7]	Loucks R G,Reed R M,Ruppel S C,et al.Morphology,genesis,and distribution of nanometer-scale pores in siliceous mudstones of the Mississippian Barnett shale[J].Journal of Sedimentary Research,2009,79(12):848-861.
[8]	Curtis M E,Cardott B J,Sondergeld C H,et al.Development of organic porosity in the Woodford Shale with increasing thermal maturity[J].International Journal of Coal Geology,2012,103:26-31.
[9]	Modica C J,Lapierre S G.Estimation of kerogen porosity in source rocks as a function of thermal transformation:example from the Mowryshale in the Powder River Basin of Wyoming[J].AAPG Bulletin,2012,96(1):87-108.
[10]	Jarvie D M,Jarvie B M,Weldon W D,et al.Components and processes impacting production success from unconventional shale resource systems[C].Manama,Bahrain:GEO-2012,10th Middle East Geosciences Conference and Exhibition,2012.
[11]	Loucks R G,Reed R M,Ruppel S C,et al.Spectrum of pore types and networks in mudrocks and a descriptive classification for matrix-related mudrock pores[J].AAPG Bulletin,2012,96(6):1071-1098.
[12]	Curtis M E,Ambrose R J,Sondergeld C H,et al.Transmission and scanning electron microscopy investigation of pore connectivity of gas shale on the nano-scale[R].Texas,USA:SPE North American Unconventional Gas Conference and Exhibition, 2011:14-17.
[13]	Zhang T W,Ellis G S,Ruppel S C,et al.Effect of organic-matter type and thermal maturity on methane adsorption in shale-gas systems[J].Organic Geochemistry,2012,47:120-131.
[14]	宋叙,王思波,曹涛涛,等.扬子地台寒武系泥页岩甲烷吸附特征[J].地质学报,2013,87(7):1041-1048.Song Xu,Wang Sibo,Cao Taotao,et al.The methane adsorption features of Cambrian shales in the Yangtze Platform[J].Acta Geologica Sinica,2013,87(7):1041-1048.
[15]	Hou Y G,He S,Yi J Z,et al.Effect of pore structure on methane sorption potential of shales[J].Petroleum Exploration and Development,2014,41(2):272-281.
[16]	毕赫,姜振学,李鹏,等.渝东南地区龙马溪组页岩吸附特征及其影响因素[J].天然气地球科学,2014,25(2):302-310.Bi He,Jiang Zhenxue,Li Peng,et al.Adsorption characteristic and influence factors of Longmaxi shale in southeastern Chongqing[J].Natural Gas Geoscience,2014,25(2):302-310.
[17]	华超,马沛生,夏淑倩,等.甲烷在烃类中的溶解度规律分析[J].化学工业与工程,2002,19(6):405-410.Hua Chao,Ma Peisheng,Xia Shuqian,et al.Analysis of the solubility of methane in hydrocarbon[J].Chemical Industry and Engineering,2002,19(6):405-410.
[18]	陈全红,李文厚,高永祥,等.鄂尔多斯盆地上三叠统延长组深湖沉积与油气聚集意义[J].中国科学:D辑:地球科学,2007,37(S1):39-48.Chen Quanhong,Li Wenhou,Gao Yongxiang,et al.The deep lacustrine sedimentary and its importance of oil-gas accumulation of Yanchang formation in Late Triassic of Ordos basin[J].Science in China Series D:Earth Science,2007,37(S1):39-48.
[19]	张文正,杨华,杨奕华,等.鄂尔多斯盆地长7优质烃源岩的岩石学、元素地球化学特征及发育环境[J].地球化学,2008,37(1):59-64.Zhang Wenzheng,Yang Hua,Yang Yihua,et al.Petrology and element geochemistry and development environment of Yanchang Formation Chang-7 high quality source rocks in Ordos Basin[J].Geochimica,2008,37(1):59-64.
[20]	张文正,杨华,解丽琴,等.鄂尔多斯盆地延长组长7优质烃源岩中超微化石的发现及意义[J].古生物学报,2011,50(1):109-117.Zhang Wenzheng,Yang Hua,Xie Liqin,et al.Discovery of micro- and nanno-fossils in high grade hydrocarbon source rocks of the Triassic Yanchang formation chang7 member in Ordos basin and its scientific significance[J].Acta Palaeontologica Sinica,2011,50(1):109-117.
[21]	Ancell K L,Price H S,Ford W K.An investigation of the gas producing and storage mechanism of the Devonian shale at Cottageville field[R].SPE 7938,1979.
[22]	蒋裕强,董大忠,漆麟,等.页岩气储层的基本特征及其评价[J].天然气工业,2010,30(10):7-12.Jiang Yuqiang,Dong Dazhong,Qi Lin,et al.The basic characte-ristic and evaluation of shale reservoir[J].Natural Gas Industry,2010,30(10):7-12.
[23]	Kuila U,Prasad M.Compositional controls on mudrock pore-size distribution:an example from Niobrara formation[C].Texas,USA:Society of Petroleum Engineers Annual Technical Conference and Exhibition,October,8-10,2012.
[24]	Sing K S W.Reporting physisorption data for gas/solid systems with special reference to the determination of surface area and porosity[J].Pure and Applied Chemistry,1985,57(4):603-619.
[25]	Gregg S J,Sing K S W.Adsorption,surface area,and porosity[M].2nd eds.London:Academic Press, 1982:138-139.