Classification and Identification of Karst Palaeogeomorphology and Prediction of Favorable Areas in Southern Yan'an Gas Field, Ordos Basin

doi:10.3969/j.issn.1006-6535.2020.06.014

Abstract

Abstract: The research degree of paleogeomorphology in the southern Yan'an gas field is poor, which is difficult to meet the requirements of fine exploration. By comprehensive utilization of drilling, well logging, mud logging and 2D seismic data, the karst palaeo-geomorphology of weathering crust on the top of Lower Paleozoic Ordovician in the southern Yan'an gas field was finely restored. Combined with the results of drilling and gas testing, the control effect of karst palaeo-geomorphology on gas reservoir distribution was clarified, and favorable target areas were divided. The results show that: (1) The study area can be divided into three secondary palaeo-geomorphological units: the western karst platform, the central karst slope and the eastern karst basin, and the third-order palaeo-geomorphic units were further identified on the secondary palaeo-geomorphic units; (2) The two flanks of grooves and the transition area between highland and depression have strong karstification and better reservoir physical properties, which are the most favorable target areas; (3) The physical properties of groove, depression and there locations far away from groove are worse. Specifically, some areas of Wuqi County and Zhidan County, Ganquan County, and the western Fuxian County and Huangling County in southwest were selected as favorable karst reservoir areas. This study can effectively improve the success rate of drilling and provide strong support for increasing reserves and production in the later stage of gas fields.

Key words: Karst palaeo-geomorphology, impression method, oil and gas distribution, seismic interpretation, favorable zone, Ordos Basin

CLC Number:

TE122.2

Zhou Yucheng, Yao Guangming, Wei Hehua, Quan Lianshun, Gao Fei, Zhao Meiye, Liu Peng. Classification and Identification of Karst Palaeogeomorphology and Prediction of Favorable Areas in Southern Yan'an Gas Field, Ordos Basin[J]. Special Oil & Gas Reservoirs, 2020, 27(6): 102-107.

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