ORGANO-CLAY COMPLEXES IN SOURCE ROCKS——A NATURAL MATERIAL FOR HYDROCARBON GENERATION

CAI Jingong; SONG Mingshui; LU Longfei; BAO Yujin; DING Fei; XU Jinli

doi:10.3724/SP.J.1140.2013.03123

2013 Vol. 33, No. 3

Article Contents

Article navigation > Marine Geology & Quaternary Geology > 2013 > 33(3): 123-131

Next Article Previous Article

CAI Jingong, SONG Mingshui, LU Longfei, BAO Yujin, DING Fei, XU Jinli. ORGANO-CLAY COMPLEXES IN SOURCE ROCKS——A NATURAL MATERIAL FOR HYDROCARBON GENERATION[J]. Marine Geology & Quaternary Geology, 2013, 33(3): 123-131. doi: 10.3724/SP.J.1140.2013.03123

Citation:

CAI Jingong, SONG Mingshui, LU Longfei, BAO Yujin, DING Fei, XU Jinli. ORGANO-CLAY COMPLEXES IN SOURCE ROCKS——A NATURAL MATERIAL FOR HYDROCARBON GENERATION[J]. Marine Geology & Quaternary Geology, 2013, 33(3): 123-131. doi: 10.3724/SP.J.1140.2013.03123

ORGANO-CLAY COMPLEXES IN SOURCE ROCKS——A NATURAL MATERIAL FOR HYDROCARBON GENERATION

1. The State Key Laboratory of Marine Geology, Tongji university, Shanghai 200092, China;
2. Geological Scientific Research Institute, Shengli Oil field Company, SINOPEC, Dongying 257000, China;
3. Wuxi Institute of Petroleum Geology, SINOPEC, Wuxi 214151, China

Received Date: 08 May 2012

Revised Date: 20 November 2012

Abstract

Abstract

Traditionally, it is believed that kerogen, a organic matter insoluble in organic solvents separated chemically from source rock, is a material for hydrocarbon generation[1].The procedure to treat samples as such, however, may destroy the original occurrence and relationship between organic matter and clay in source rocks. We extracted an organo-clay complex (μm) from the crushed source rocks in the depth of 280~3 500 m, in the Jiyang sag, East China. The complex is mainly composed of layered illite-smectite (I-S) and illite with a value of TOC up to 2.62%~9.78%. After treatment with H2O2, TOC remains as high as 1.23%~4.63%, suggesting that it is the components in which organic matters are enriched. The diffraction peak (d001) of the complex is 1.3~1.4nm at 250℃, and moves to 1.0 nm at 550℃ in XRD curves, and the exothermic peaks of the complex is extraordinary stable at 350℃ in DTA curves.; The result is consistent in both the XRD and DTA observations. It indicates that organic matter can enter the interlayer space of clay minerals. With PY-GC analysis, the organic matter of C5 and C25 is released from the complex in a temperature range of 250~650℃, and reaches a peak at about 450℃. Our findings reveal that organic matter can enter interlayer of clay minerals forming a kind of natural and highly stable organo-clay complex, and the composition of the organic matter in the complex is similar to the crude oil. As a kind of natural material, the organo-clay complex plays an important role in hydrocarbon generation in source rocks.
- organo-clay complexes /
- organic enrichment /
- property stability /
- hydrocarbon generation material

FullText(HTML)

References

[1]	Tissot B P,Welte D H. Ptroleum Formation and Occurrence(second edition)[M].New York:Springer-Verlag,1984. Google Scholar
[2]	Weaver C E. Possible uses of clay minerals in research for oil[J]. AAPG Bull., 1960,44(9):1505-1578. Google Scholar
[3]	Hunt J M. Petroleum Geochemistry and Geology(second edition)[M]. New York:W H Freeman and company,1996. Google Scholar
[4]	Seewald J S.Organic-inorganic interactions in petroleum-producing sedimentary basins[J]. Nature, 2003, 426(20):327-333. Google Scholar
[5]	Keil R G,Hedges J I.Sorption of organic matter to mineral surfaces and the preservation of organic matter in coastal marine sediments[J]. Chemical Geology, 1993,107:385-388. Google Scholar
[6]	Bergamaschi B A, Tsamakis E, Keil R G, et al. The effect of grain size and surface area on organic matter, lignin and carbohydrate concentration, and molecular compositions in Peru Margin sediments[J]. Geochimica et Cosmochimica Acta, 1997, 61:1247-1260. Google Scholar
[7]	熊毅.土壤胶体(第一册)[M].北京:科学出版社,1983.[XIONG Yi.Soil Colloid (first vol)[M]. Beijing:Scienc Press, 1983.] Google Scholar
[8]	王行信,周书欣.有机黏土化学在油气生成研究中的意义[J].地质地球化学,1991,19(5):3-8. Google Scholar [WANG Xingxin,ZHOU Shuxin. A research significance for organo-caly chemistry in Petroleum formation[J]. Geology-Geochemistry, 1991,19(5):3-8.] Google Scholar
[9]	Kennedy M J, Pevear D R, Hill R H. Mineral surface control of organic carbon in black shale[J]. Science, 2002, 295:657-660. Google Scholar
[10]	蔡进功.泥质沉积物和泥岩中有机黏土复合体[M]. 北京:科学出版社,2004.[CAI Jingong. Organo-clay Complexes in Muddy Sediment and Muddy Rock[M]. Beijing:Science Press, 2004. Google Scholar
[11]	Weiler R R,Mills A A. Surface properties and pore structure of marine sediments[J]. Deep Sea Research, 1965,12:511-529. Google Scholar
[12]	Suess E R. Interaction of organic compounds with calcium carbonate-Ⅱ[J]. Geochim et Cosmochim. Acta, 1973, 37:2435-2447. Google Scholar
[13]	Mayer L M.Surface area control of organic carbon accumulation in continental shelf sediments[J]. Geochimica et Cosmochimica Acta, 1994,58:1271-1284. Google Scholar
[14]	Mayer L M.Extent of coverage of mineral surfaces by organic matter in marine sediments[J]. Geochimica et Cosmochimica Acta, 1999.63:207-215. Google Scholar
[15]	Keil R G., Montlucon D B, Prahl F G, et al. Sorptive preservation of labile organic matter in marine sediments[J]. Nature, 1994c, 370:549-552. Google Scholar
[16]	Hedges J I,Keil R G.Sedimentary organic matter preservation:An assessment and speculative synthesis[J]. Marine Chemistry,1995,49:81-115. Google Scholar
[17]	Carter M R, Angers D A, Gregorich E G, et al. Characterizing organic matter retention for surface soils in eastern Canada using density and particle size fractions[J]. Can. J. Soil Sci., 2003,83(1):11-23. Google Scholar
[18]	Dexter A R, Richard G, Arrouays D, et al. Complexed organic matter controls soil physical properties[J]. Geoderma, 2008,(8):1-8. Google Scholar
[19]	Durand B. Kerogen-Insoluble Organic Matter from Sedimentary Rocks[M]. Paris:Editions Technip,1980. Google Scholar
[20]	傅家谟,秦匡宗.干酪根地球化学[M].广州:广东科技出版社,1995.[FU Jiamo,QIN Kuangzhong. Geochemical Characteristics of Kerogen[M]. Guangzhou:Guangdong science and Technology Press,1995.] Google Scholar
[21]	苗建宇,祝总祺, 刘文荣,等. 泥质岩有机质的赋存状态及其对泥岩封盖能力的影响[J].沉积学报,1999,7(3):1-5. Google Scholar [MIAO Jianyu, ZHU Zongqi, LIU Wenrong,et al. Occurrence of organic matter and its effect on sealing ability of argillaceous rock[J]. Acta Sedimentologica Sinica, 1999,7(3):1-5.] Google Scholar
[22]	张林晔,孔祥星,张春荣,等.济阳坳陷下第三系优质烃源岩的发育及其意义[J].地球化学,2003.32(1):35-42. Google Scholar [ZHANG Linye,KONG Xiangxing,ZHANG Chunrong. High quality oil prone source rocks in Jiyang Depression[J].Geochimica,2003.32(1):35-42.] Google Scholar
[23]	Cai Jingong, Bao Yujin, Yang Shouye, et al, Research on preservation and enrichment mechanisms of organic matter in muddy sediment and mudstone[J]. Science in China (Series D),2007, 50(5):765-77. Google Scholar
[24]	Williama L B, Canfield B, Voglesonger K M,et al. Organic molecules formed in a ‘primordial womb’[J]. Geology, 2005,33(11):913-916. Google Scholar
[25]	格里姆R E著,许冀泉译. 黏土矿物学[M]. 北京:地质出版社,1960:83-103.[Grim R E.(translated by XU Jiquan). Clay Minerals[M]. Beijing:Geological Publishing House, 1960:83 Google Scholar -103.] Google Scholar
[26]	Armstrong D E, Chesters G. Properties of protein-bentonite complexes as influenced by equilibration conditions[J]. Soil Sci., 1964, 98:39-52. Google Scholar
[27]	Perez Rodriguez J L, Weiss A, Lagaly G. A natural clay organic complex from Andalusian black earth[J]. Clays Clay Minerals, 1977,25:243-251. Google Scholar
[28]	Lagaly G.Characterization of clays by organic compounds[J]. Clay Minerals, 1981,16:1-21. Google Scholar
[29]	Zhu Jianxi, He Hongping, Guo Jiugao, et al. Arrangement models of alkylammonium cations in the interlayer of HDTMA+ pillared montmorillonites[J]. Chinese Science Bulletin, 2003,48(4):368-372. Google Scholar
[30]	Carrado K A. Synthetic organo-and polymer-clays:preparation characterization and materials applications[J]. Appl. Clay Sci., 2000,17:1-23. Google Scholar
[31]	Theng B K. Formation and Properties of Clay-Polymer Complexes[M]. Amsterdam:Elsevies, 1979. Google Scholar
[32]	Yariv S,Cross H. Organic-clay Complexes and Interaction[M]. New Nork:Marcel Dekker, 2002:39-174. Google Scholar