Natural gas origins of the large-medium sized gas fields in China

Conference · Mon Jan 01 04:00:00 EST 1996 · AAPG Bulletin

OSTI ID:6566732

Dai, Jinxing ^[1]; Li, Xianqi; Qin, Shengfei

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1. Research Inst. of Petroleum Exploration and Development, Beijing (China)

Large-medium sized gas field refers to the gas field with proved reserves over 100 X 10[sup 8]m[sup 3]. By the end of 1994, 30 large or medium sized gas fields have been found in China (except for Taiwan province), of which the proved gas reserves account for 71% of the total chinese gas reserves. And four origins of the natural gases of large-medium sized gas fields have been determined in China: (1) Oil-type gas holds a dominant position of the gases, is primarily dry gas with [delta][sup 13]C[sub 1] values ranging from -39.82[per thousand] to -31. 93[per thousand], R/Ra ratio values being 0.003 [approx] 0.150; (2) Coal-formed gas takes the second place of the gases, is predominately wet gas, with [delta][sup 13]C[sub 1] values from -39.55[per thousand] to -27.80[per thousand], and R/Ra ratio values of 0.016[approx]0.686; (3) Mixed-gas is mainly dry gas, with [delta][sup 13]C[sub 1] values varying within -35.87[per thousand][approx]-33.40[per thousand], R/Ra ratio values being 0.014[approx]0.040; (4) Biogenic gas is only dry gas, with [delta][sup 13]C[sub 1] values from -68.54[per thousand] to -64.90[per thousand], R/Ra ratio values of 0.030-0.305. In a word, this paper elaborates the natural gas origins of chinese large-medium sized gas fields, based on the full and accurate data of gas components, carbon isotopic compositions of alkane gases ([delta][sup 13]C[sub 1-4]) and Carbon dioxide ([delta][sup 13]C[sub CO[sub 2]]), and the associated helium isotopes (R/ Ra).

• OSTI ID: 6566732
• Report Number(s): CONF-960527--
• Conference Information: Journal Name: AAPG Bulletin Journal Volume: 5
• Country of Publication: United States
• Language: English

Related Subjects

03 NATURAL GAS
030200* -- Natural Gas-- Reserves
Geology
& Exploration
033000 -- Natural Gas-- Properties & Composition
ALKANES
ASIA
CHEMICAL COMPOSITION
CHINA
COAL DEPOSITS
ENERGY SOURCES
FLUIDS
FOSSIL FUELS
FUEL GAS
FUELS
GAS FUELS
GASES
GEOLOGIC DEPOSITS
HYDROCARBONS
METHANE
MINERAL RESOURCES
NATURAL GAS
NATURAL GAS DEPOSITS
NATURAL GAS FIELDS
ORGANIC COMPOUNDS
ORIGIN
RESERVES
RESOURCES