鄂尔多斯盆地大牛地气田奥陶系“垮塌”型岩溶储层发育规律

doi:10.11743/ogg20160209

Abstract

Abstract: Due to wide application of horizontal well fracturing technology in the Ordovician weathering crust reservoirs of Daniudi gasfield, Ordos Basin, karst reservoirs exhibit its great potential of gas production, regardless of its low porosity, permeability and strong heterogeneity.However, development pattern of reservoir is the key of gas accumulation in karst reservoirs.Karst cycles and reservoirs distribution are studied by using lithofacies based on core observation and well-logging interpretation.The following results were obtained.(1) Three Karst cycles can be identified in the Ordovician Majiagou Formation.The upper two karst cycles formed in the earlier time and are larger in scale than the lower one; therefore the development of karst reservoirs are mainly related to the upper two karst cycles.(2) The long-term dissolution of gypsiferous dolostone and muddy dolostone layers produces fractures in cave-roof zone and finally led to the collapse of overlying strata, forming a thick layer of breccias.(3) Reservoirs are mainly developed in areas with relatively weak karst intensity.Laterally, they mainly occur in monadnock of palaeogeomorphology slope, while vertically, they are distributed in the intact vadose zones of upper two karst cycles.The lithofacies are dominated by crackle-mosaic breccias lithofacies.The research on karst cycles and lithofacies will play significant roles in the reservoir predication for the following gas exploration.

Key words: karst, reservoir, lithofacies, Ordovician, Daniudi gasfield, Ordos Basin

CLC Number:

TE122.2

Ding Xiaoqi, Zhang Shaonan, Pan Huaixiao, Li Liang, Jia Huichong. Development patterns of collapse-type karst reservoirs in the Ordovician of Daniudi gasfield, Ordos Basin[J]. Oil & Gas Geology, 2016, 37(2): 210-217.

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Development patterns of collapse-type karst reservoirs in the Ordovician of Daniudi gasfield, Ordos Basin

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