Accumulation Characteristics of Natural Gas from the Ordovician Kelimoli Formation,Western Ordos Basin
Received date: 2014-10-31
Revised date: 2015-01-29
Online published: 2015-10-10
Based on geological conditions of Ordovician Kelimoli Formation in western Ordos Basin,fracture-cavity reservoir and source rock conditions as well as gas accumulation characteristics are studied,migration and accumulation features of natural gas are analyzed,and accumulation models in different areas are built.The results show that Kelimoli Formation is mainly composed of brecciated limestones.The storage space is a fracture-cavity system with logging response of high GR,high AC and low RT and it shows good connectivity through well-connecting profiles.Its origin is dominantly controlled by lithology and slope topography.Mud limestones from Ordovician Wulalike Formation to Lashizhong Formation and Carboniferous-Permian coal-bearing strata are effective source rocks.Gas source correlation results show that natural gas in the Kelimoli Formation is mainly from coal-measure source rocks.Kelimoli Formation mainly comprises dissolved fracture-cavity reservoir and local development of dolomite lens reservoir,both of which belong to dry gas reservoir and are featured by bedding-parallel development and stratiform-like distribution.Combined with methane carbon isotopes and components of natural gas,three gas accumulation models in the Kelimoli Formation are built,migration downward along carrier bed in the deposition area of Lashizhong-Wulalike Formation,migration downward directly in the exposed area of Kelimoli Formation,and migration downward vertically along faults in faulted zones.
WU Wei-tao,ZHAO Jing-zhou,SUN Liu-yi,MA Zhan-rong,XIAO Hui,LI Lei . Accumulation Characteristics of Natural Gas from the Ordovician Kelimoli Formation,Western Ordos Basin[J]. Natural Gas Geoscience, 2015 , 26(10) : 1862 -1872 . DOI: 10.11764/j.issn.1672-1926.2015.10.1862
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