我国不同类型盆地高效大中型气田形成的主控因素

付广; 吕延防; 于丹

Volume 32 Issue 1

Jan. 2007

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FU Guang, LÜ Yan-fang, YU Dan, 2007. Major Factors Controlling Formation of Large and Intermediate Gas Fields with High Gas Accumulation Efficiency in Different Types of Basins in China. Earth Science, 32(1): 82-88.

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Major Factors Controlling Formation of Large and Intermediate Gas Fields with High Gas Accumulation Efficiency in Different Types of Basins in China

Geoscience College, Daqing Petroleum Institute, Daqing 163318, China

Received Date: 2006-04-05
Publish Date: 2007-01-25

Abstract

Abstract

In this paper, gas accumulation efficiency was defined and calculated in terms of gas reserves, gas-bearing areas and accumulation periods. The calculation of gas accumulation efficiencies for about 60 large and intermediate gas fields in China concludes three types of large and intermediate gas fields with high, middle and low gas accumulation efficiencies. The comprehensive study of gas accumulation efficiency and different pooling conditions reveals that the formation of large and intermediate gas fields with high gas accumulation efficiency in different types of basins in China was controlled by gas supply of source rocks, gas transportation and gas seal and preservation. The creation of high gas accumulation intensity of source rocks in the large and intermediate gas fields is indispensable to the foreland basin often greater than 80×10⁸ m³/km²·Ma, to the cratonic basin often greater than 26×10⁸ m³/km²·Ma, and to the rift basin often greater than 60×10⁸ m³/km²·Ma. The gas transportation velocity of transporting layer in the foreland and rift basins should often be greater than 5×10^-14 m/Pa·s, that in the cratonic basin greater than 6×10^-12 m/Pa·s. The comprehensive caprock seal index in the foreland basin should often be greater than 1×10¹⁰ m/s, that in the cratonic basin greater than 5×10⁹ m/s, and that in the rift basin greater than 3×10¹⁰ m/s. The gas accumulation period in the foreland basin should often be later than the Middle Eogene, and that in the cratonic and rift basins later than the Early Eogene.
- large and intermediate gas fields,
- accumulation efficiency,
- major controlling factors,
- generation intensity,
- caprock seal index,
- accumulation period,
- transporting velocity

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Major Factors Controlling Formation of Large and Intermediate Gas Fields with High Gas Accumulation Efficiency in Different Types of Basins in China

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