Characteristics of Hydrocarbon Generation Potential, Hydrocarbon Composition and Hydrocarbon Generating model of Desmocollinite from Late Permian Coals in Shuicheng, Guizhou Province

SUN Xu guang; WANG Guan yu; JIN Kui li

Desmocollinite is one of the major macerals of Late Permian Longtan Formation coals in Shuicheng, Guizhou Province, Southwest China. The characteristics of hydrocarbon generation of desmocollinite are important to evaluate and explore oil and gas resources derive from coals. In this paper, Rock eval, Py GC and experimental simulation in an open system were used to study hydrocarbon generation potential, hydrocarbon composition, hydrocarbon generation model and thermoevolutional characteristics of desmocollinite. The results indicate that desmocollinite has high hydrocarbon generation potential, with (S ₁+S ₂) of 191.6mg/g, which is higher than that of fusinite (S ₁+S ₂ is 26.2mg/g,), and lower than of barkinite (S ₁+S ₂ is 297mg/g); light hydrocarbon (C ₆-C ₁₄ )and wet gas (C ₂-C ₅)are the main hydrocarbon composition; the "oil window" of desmocollinite is within 375～475 ℃, the main temperature range of hydrocarbon generation is at 400～450 ℃ with a peak range of 410～430 ℃, and the temperature of maximum hydrocarbon generating rates is at 420 ℃. These studies show that desmocollinite from barkinite rich coal is one of oil generated macerals, which is attributed to abundant submicro liptinites in desmocollinite,and desmocollinite also can generate a large amount of hydrocarbon in higher mature degree, these hydrocarbon generating model of desmocollinite is favorable for exploring oil and gas resources in South China.

Characteristics of Hydrocarbon Generation Potential, Hydrocarbon Composition and Hydrocarbon Generating model of Desmocollinite from Late Permian Coals in Shuicheng, Guizhou Province

1. Department of Geology, Peking University, Beijing 100871;

2. Beijing Graduate School,China University of Mining and Technology,Beijing 100083

Received Date: 1999-08-31

Rev Recd Date: 2000-03-27

Publish Date: 2000-08-10

Key words:

Guizhou Province /
desmocollinite /
hydrocarbon-generation potential hydrocarbon composition /
hyd rocar lbon-generation rmodel /

Abstract: Desmocollinite is one of the major macerals of Late Permian Longtan Formation coals in Shuicheng, Guizhou Province, Southwest China. The characteristics of hydrocarbon generation of desmocollinite are important to evaluate and explore oil and gas resources derive from coals. In this paper, Rock eval, Py GC and experimental simulation in an open system were used to study hydrocarbon generation potential, hydrocarbon composition, hydrocarbon generation model and thermoevolutional characteristics of desmocollinite. The results indicate that desmocollinite has high hydrocarbon generation potential, with (S ₁+S ₂) of 191.6mg/g, which is higher than that of fusinite (S ₁+S ₂ is 26.2mg/g,), and lower than of barkinite (S ₁+S ₂ is 297mg/g); light hydrocarbon (C ₆-C ₁₄ )and wet gas (C ₂-C ₅)are the main hydrocarbon composition; the "oil window" of desmocollinite is within 375～475 ℃, the main temperature range of hydrocarbon generation is at 400～450 ℃ with a peak range of 410～430 ℃, and the temperature of maximum hydrocarbon generating rates is at 420 ℃. These studies show that desmocollinite from barkinite rich coal is one of oil generated macerals, which is attributed to abundant submicro liptinites in desmocollinite,and desmocollinite also can generate a large amount of hydrocarbon in higher mature degree, these hydrocarbon generating model of desmocollinite is favorable for exploring oil and gas resources in South China.

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Reference (19)

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Characteristics of Hydrocarbon Generation Potential, Hydrocarbon Composition and Hydrocarbon Generating model of Desmocollinite from Late Permian Coals in Shuicheng, Guizhou Province

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