Tight gas reservoir characteristics and exploration potential of Jurassic Ahe Formation in Kuqa Depression, Tarim Basin#br#

doi:10.3969/j.issn.1672-7703.2021.04.009

Abstract

Abstract: The natural gas exploration in Kuqa Depression mainly focuses on conventional gas of Cretaceous in Kerasu area,
while relatively few studies have been conducted on unconventional oil and gas. Although several oil and gas reservoirs were
discovered, the large-scale natural gas development has not been complemented due to the unclear understanding of hydrocarbon
enrichment rules and other reasons. Taking the Dibei gas reservoir in the northern structural belt of Kuqa Depression as the study
object, this paper analyzes the characteristics of structures and faults, physical properties of gas reservoir and fluid, and reservoir
performance, so as to clarify the basic characteristics of tight gas reservoir of Jurassic Ahe Formation and the controlling factors
of gas enrichment. The study results show that the “sandwiched” source rock-reservoir-caprock assemblage is developed of Dibei
gas reservoir, with effective source rocks at roof and floor of thick sandstone reservoir. The geological “sweet spot” formed by the
configuration of effective reservoir and fault-fracture controls the gas enrichment and single well production. Based on this understanding,and given the regional distribution of hydrocarbon source rocks, large-scale reservoir, and structural characteristics, it is proposed that the Jurassic Ahe Formation has the geological conditions for forming a trillion-cubit-meter-scale tight gas reserve base, which is the realistic field for tight gas exploration in the future.

CLC Number:

TE112

Tang Yangang, Yang Xianzhang, Xie Huiwen, Xu Zhenping, Wei Hongxing, Xie Yani. Tight gas reservoir characteristics and exploration potential of Jurassic Ahe Formation in Kuqa Depression, Tarim Basin#br#[J]. China Petroleum Exploration, 2021, 26(4): 113-124.

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