Discussion on Gas Exploration of Middle Permian Qixia Formation, Sichuan Basin
Received date: 2008-05-06
Revised date: 2009-05-18
Online published: 2009-06-10
The Qixia Formation of Sichuan Basin is mainly gray\|grayish black and bioclastic limestone, and the sedimentary facies are mainly bioclastic bank, and deep and shallow gentle slope in the carbonate platform that had quiet seawater, luxuriant organism, and abundant organic matter. The formation has two better source beds, Silurian system and Yangxing Series, the average gas\|generating strength is >20 ×108m3/km2 and the highest attains 170×108m3/km2, and they may be the best source beds of Sichuan Basin. As the limestone texture is mainly micritic, porosity and permeability are poor, gas reservation mainly relys on dolomitization, paleokarstification and fracturing. Dolomitization improves the pore space, paleokarst forms caves, in which the tool drilling break may attain 4.75 m, and fractures play the role of connection between pores and caves. Although the exploration degree is very low and the gas reservoir obtained by drilling is fewer, there exists high yield gas producer, such as Well Z1-2 has produced more than 46.6×108m3 of cumulative gas yield from the commingling production of Qixia and Maokou Formations, illustrating a great potential.
Key words： Sichuan Basin; Permian; Qixia Formation; Natural gas; Exploration.
CHEN Zong-Qing . Discussion on Gas Exploration of Middle Permian Qixia Formation, Sichuan Basin[J]. Natural Gas Geoscience, 2009 , 20(3) : 325 -334 . DOI: 10.11764/j.issn.1672-1926.2009.03.325
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