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

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Abstract

References

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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

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References

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