排烃门限存在的地质地球化学证据及其应用

庞雄奇; 李素梅; 金之钧; 黎茂稳

Volume 29 Issue 4

Jul. 2004

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PANG Xiong-qi, LI Su-mei, JIN Zhi-jun, LI Mao-wen, 2004. Geochemical Evidences of Hydrocarbon Expulsion Threshold and Its Application. Earth Science, 29(4): 384-390.

Citation:

PANG Xiong-qi, LI Su-mei, JIN Zhi-jun, LI Mao-wen, 2004. Geochemical Evidences of Hydrocarbon Expulsion Threshold and Its Application. Earth Science, 29(4): 384-390.

PANG Xiong-qi, LI Su-mei, JIN Zhi-jun, LI Mao-wen, 2004. Geochemical Evidences of Hydrocarbon Expulsion Threshold and Its Application. Earth Science, 29(4): 384-390.

Citation:

PANG Xiong-qi, LI Su-mei, JIN Zhi-jun, LI Mao-wen, 2004. Geochemical Evidences of Hydrocarbon Expulsion Threshold and Its Application. Earth Science, 29(4): 384-390.

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Geochemical Evidences of Hydrocarbon Expulsion Threshold and Its Application

PANG Xiong-qi^{1, 2
,},
LI Su-mei^{1, 2},
JIN Zhi-jun¹,
LI Mao-wen^{1, 3}

1.
Key Laboratory for Hydrocarbon Accumulation Mechanism, University ofPetroleum, Ministry ofEducation, Beijing 102249, China
2.
Basin & Reservoir Research Center, University ofPetroleum, Beijing 102249, China
3.
Geological Survey ofCanada, Calgary

Received Date: 2004-03-18
Publish Date: 2004-07-25

Abstract

Abstract

The concept of "Hydrocarbon expulsion threshold" is taken as an important theoretical base in the identification of effective source rock, and therefore, plays a significant role in petroleum exploration and resource assessment. Occurrence of hydrocarbon expulsion threshold is discussed by means of geochemical approaches. The results show that the parameters of (S₁+S₂)/TOC, HI showing source rock potential and the abundance of resident hydrocarbons-"A" decrease obviously with increasing depth once source rocks reach the expulsion threshold, and obvious variation of chemical composition as well as (abundance) and relative distribution of biomarkers can also be observed. Similar chemical compositions between crude oils and soluble organic matters are observed after the source rocks entered the expulsion threshold, however, the discrepancies are present within the source rocks below the expulsion threshold. Taking as an example of the Dongying depression of the Bohaiwan basin, the expulsion thresholds of Es⁴ mudstone and shale in Bamianhe area are about 2 200 and 2 000 m respectively, with expulsion intensity of 0-1 100 and 0-150 kg/m² and expulsed accumulative hydrocarbons of 7.365×10⁸ and 1.435×10⁸ t.
- hydrocarbon expulsion threshold,
- resource assessment,
- source rock potential,
- hydrocarbon composition,
- biomarker

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References(21)

References

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