Discovery of Kelasu Subsalt Deep Large Gas Field, Tarim Basin

摘要/Abstract

摘要： Kelasu tectonic belt is located in the northern Kuqa depression and the discovered subsalt large-deep gas field in the tectonic belt belongs to ultra-deep high-pressure gas fields with low-porosity high-yield fractured sandstones. Up to now 22 oil and gas reservoirs have been discovered in the gas field, which are the major production areas for natural gas in Tarim basin. There was no significant break-through after the discovery of Kela 2 gas field in 1998. Since 2006, the research of the deep zones in Kelasu tectonic belt has been strengthened, and in Aug., 2008 commercial gas flows were gained from the Cretaceous Bashijiqike formation in the Well Keshen-2 which is located in the Keshen-2 structure of Keshen area and the daily gas production was 40×104 m3, marking a great breakthrough has been gained. Then over 10 years of study, technological breakthroughs have been made on foreland basin exploration technology, petroleum geological theory and production practice, which provides guidance for the discovery of the Kelasu subsalt deep large gas field. The researches on trap identification in complex mountain areas, reservoir forming mechanism and hydrocarbon accumulation, speedy drilling and reservoir reformation effectively support the efficient exploration and development of the Kelasu subsalt deep large gas field.

关键词: Tarim Basin, Kelasu tectonic belt, Cretaceous, Bashijiqike Formation, subsalt deep large gas field, sandstone gas reservoir

Abstract: Kelasu tectonic belt is located in the northern Kuqa depression and the discovered subsalt large-deep gas field in the tectonic belt belongs to ultra-deep high-pressure gas fields with low-porosity high-yield fractured sandstones. Up to now 22 oil and gas reservoirs have been discovered in the gas field, which are the major production areas for natural gas in Tarim basin. There was no significant break-through after the discovery of Kela 2 gas field in 1998. Since 2006, the research of the deep zones in Kelasu tectonic belt has been strengthened, and in Aug., 2008 commercial gas flows were gained from the Cretaceous Bashijiqike formation in the Well Keshen-2 which is located in the Keshen-2 structure of Keshen area and the daily gas production was 40×104 m3, marking a great breakthrough has been gained. Then over 10 years of study, technological breakthroughs have been made on foreland basin exploration technology, petroleum geological theory and production practice, which provides guidance for the discovery of the Kelasu subsalt deep large gas field. The researches on trap identification in complex mountain areas, reservoir forming mechanism and hydrocarbon accumulation, speedy drilling and reservoir reformation effectively support the efficient exploration and development of the Kelasu subsalt deep large gas field.

Key words: Tarim Basin, Kelasu tectonic belt, Cretaceous, Bashijiqike Formation, subsalt deep large gas field, sandstone gas reservoir

YANG Haijun, LI Yong, TANG Yan'gang, LEI Ganglin, ZHOU Lu, ZHOU Peng. Discovery of Kelasu Subsalt Deep Large Gas Field, Tarim Basin[J]. 新疆石油地质, 2019, 40(zk(English) ): 12-20.

YANG Haijun, LI Yong, TANG Yan'gang, LEI Ganglin, ZHOU Lu, ZHOU Peng. Discovery of Kelasu Subsalt Deep Large Gas Field, Tarim Basin[J]. Xinjiang Petroleum Geology, 2019, 40(zk(English) ): 12-20.

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