Control Factor of Natural Gas Accumulation in Xujiahe Formation，Longnüsi Structure，Sichuan Basin

西南石油大学学报(自然科学版) ›› 2012, Vol. 34 ›› Issue (1): 6-12.

• 地质勘探 • Previous Articles Next Articles

Control Factor of Natural Gas Accumulation in Xujiahe Formation，Longnüsi Structure，Sichuan Basin

Yuan Haifeng1, Ni Gensheng2, Deng Xiaojiang3

1. State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation，Chengdu University of Technology，Chengdu，Sichuan 610059，China2. Low-Efficiency Hydrocarbon Development Department，Southwest Oil & Gas Field Company，Petrochina，Chengdu，Sichuan 610017，China3. Geophysical Exploration Company，Chuanqing Engineering Company Limited，Chengdu，Sichuan 610225，China

Received:1900-01-01 Revised:1900-01-01 Online:2012-02-01 Published:2012-02-01

Abstract

Abstract: The natural gas reservoir in Xujiahe Formation of Longnüsi structure is a typical lithologic gas reservoir，with the low trap closure，the tight reservoir，and the complicated gas-water contact. The paper analyzes the source rocks，reservoir rocks，cap rocks and trap conditions of gas reservoir of Xujiahe Formation，and conculdes that the Xujiahe Formation is advantageous
play. The Apatite Fission Track and Easy%Ro Chemical Kinetics Simulatiom are both used to reconstruct the hydrocarbongeneration
history of source rock. Combined with the structural evolution，the charging process of Xujiahe Formation gas
reservoir was reproduced. The accumulation process is divided into three phases：early hydrocarbon charging at the end of
middle Jurassic，the dominant hydrocarbon charging period at the end of Cretaceous，and the final accumulation of gas pools
during Himalayan. The main controlling factors of gas accumulation in Xujiahe Formation are analyzed in the paper. Highquality
hydrocarbon source rock is the primary material，the ancient and present structural high are the available zones for
the hydrocarbon migration，the reservoir physical property and the trap closure control the gas-water distribution in the gas
reservoir，and the fractures developed locally is a key factor of gas accumulation and high productivity in the Xujiahe Formation.

Key words: Sichuan Basin, Longnüsi structure, Xujiahe Formation, the controlling factors of gas accumulation, apatite fission track

CLC Number:

TE132.1

Yuan Haifeng;Ni Gensheng;Deng Xiaojiang. Control Factor of Natural Gas Accumulation in Xujiahe Formation，Longnüsi Structure，Sichuan Basin[J]. 西南石油大学学报(自然科学版), 2012, 34(1): 6-12.

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Control Factor of Natural Gas Accumulation in Xujiahe Formation，Longnüsi Structure，Sichuan Basin

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