Analysis Of Xujiahe Formation High-productivity Wells Factors In Guang’an Area

With the development of oil and gas exploration and development technology ofSichuan Basin, oil and gas exploration and development and continuously made newprogress. Guang’an area in Sichuan Xujiahe Formation in Sichuan Basin as animportant oil and gas exploration layer, because the area is mainly lithologic andstructural lithologic reservoir exploration combination, the difficulty of existence, thesame area in different layers of gas is different, the same horizon well test results ofdifferent well area differ widely, there great necessity for further exploration anddevelopment in the Xujiahe group. In this paper, by using the Guang’an Xujiahe groupexisting exploration and development experience, combined with the high productionwells, middle well, low yield wells in single well comprehensive analysis,comparative study, and explores the main factors the high-yield wells yield.The study found:①the area of gas wells producing layer where the horizonand reservoir sand is fine or not, is the most important factor in determining yield;②the gas layer is layer by structure factor (Guang’an fault and the formation ofassociated fractures)；③the gas has high water saturation, low gas saturation, is alsoan important reason to affect the gas yield. According to the above several factors, thearea of oil and gas wells were collected, classified, using single well studied high,middle, low yield oil and gas, and combined with the tectonic background, sourcerock, reservoir characteristics, reservoir types, discusses how to influence the gas wellproductivity finally, the main factors that determine the comprehensive high yieldregion.