Origin and AccumulationModel ofNaturalGases in the Dongfang 1-1 Gas Field of the Yinggehai Basin

ZHAO Bi-qiang; XIAO Xian-ming; HU Zhong-liang; HUANG Bao-jia

Abstract

The Dong fong 1-1 Gas Field of the Y inggehai Basin has great attract iveness because its characterist ics of a shallow burial depth, wide variations of gas composition and occurrence in the diapir fault belt. There have been still problems on gas source and gas-filling model for a long period. In th is paper, the method of hydrocarbon generation kinetics and carbon isotopic fraction kineticsw as applied to some typical source rocks from th is basin, and a geo logical model of gas generation and methane carbon isotopic fraction was suggested. With the comb ination of the geo logical and geochemical background of the Dong fong 1-1 Gas Filed, it was believed that the hydrocarbon gases were mainly from the coal measure source rocks in the Meishan Formation, but non-hydrocarbon gas the calcareous shale in the Shanya Formation. The gas pool is qu ite young, and is related to the diap irism. The hydrocarbon gas was charged after t 1.3Ma, and CO₂ gas at about 0.1Ma. Thew ide variat ion compositions of the natura l gas were controlled by episode charges of gases controlled by diapir fault activities.

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References

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Origin and AccumulationModel ofNaturalGases in the Dongfang 1-1 Gas Field of the Yinggehai Basin

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