A research on carbonate karst reservoirs classification and its implication on hydrocarbon exploration: Cases studies from Tarim Basin


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Acta Petrologica Sinica

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Karst reservoirs were very important explorational target in China marine hydrocarbon-bearing basins. Based on the eases studies of karst reservoir from Tarim basin, it could be concluded that porespace, which was mainly composed of vug, cavern and solution fissure with different geological background and origins, could distributed in the area of carbonate hills and carbonate interstratum. According to the distribution of porespace, karst reservoirs could be divided into four types, in which, buried hill (weathering crust) karst reservoir could be divided into two subtypes as limestone buried hill karst reservoir and dolomite crust karst reservoir. Buried hill (weathering crust) karst reservoirs developed in area of buried carbonate hill which were related to mid-long term angle uncomformity with intensive terrain relief while interstratum karst reservoir and bedding karst reservoir developed in area of interstratum with minor terrain relief. Interstratum karst reservoir was related to short-mid disconformity within carbonate sequence with bedded distributional characteristics while bedding karst reservoir was related to slope geological background with circle-rimmed distributional characteristics around carbonate hill. Fault-related karst reservoir mainly developed in area of interstratum, especially in the core of anticline and porespace developed along fault. Tradditional karst reservoirs give the way to the subdivision of karst reservoirs which expand the explorational realm for karst reservoirs. The explorational realm has been stretched from carbonate hill into carbonate interstratum which would play important roles for hydrocarbon exploration in China marine carbonate basins.

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