Discussion on characteristics of the Cambrian-Ordovician carbonate rocks reservoirs and origin of dolostones in Tarim Basin
Huang Wenhui1, Wang Anjia1, Wan Huan1, Fan Tailiang1, Yu Bingsong2
1 Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Accumulation Mechanism， Ministry of Education，China University of Geosciences(Beijing)，Beijing 100083 2 School of Earth Sciences and Resources，China University of Geosciences(Beijing)，Beijing 100083
Abstract：High quality reservoirs occur in the Cambrian-Ordovician carbonate rocks with abundant oil and gas resources in the Tarim Basin.Based on field geological inspection，core observation and analysis，identification of normal thin sections and cast sections，the detailed survey on its storage features and the classification of space type were conducted;and the formation and evolution of different storage spaces were preliminarily analyzed.In conclusion，the storage space of carbonate rocks could be divided into three categories，pores，vugs and fractures;Furthermore，it could be subdivided into intergranular pores，intragranular pores，intercrystal pores，moldic pores，organic framework pores，vugs，caverns，structural fractures，compaction dissolved fractures and dissolved fractures.Caverns and fractures are the most effective space for storage.Carbonate rocks underwent multi-stage reconstruction by diagenesis.In addition，late-stage tectonic activities also provided a large amount of fissures.Most of effective storage space is secondary-genetic, and dissolution enhances reservoir performance to a large degree.The reservoir types are fracture-pore，fracture-cave and fracture ones，and the fracture-cave type is the critical reservoir.Dolostones of different origins occur in the Cambrian and Lower Ordovician.The Cambrian dolostone was predominantly formed in supratidal and intertidal zones，associated with tidal flat and lagoons.It belongs to penecontemporaneous product.The Lower Ordovician dolostone mainly belongs to reflux-see-page/dorag dolomitization product.Part of the Lower Ordovician reef and beach limestone was dolomitized and then belongs to the replacement product that also occurs in deep Ordovician strata and belongs to burial dolomitization product in late stage.
Huang Wenhui,Wang Anjia,Wan Huan et al. Discussion on characteristics of the Cambrian-Ordovician carbonate rocks reservoirs and origin of dolostones in Tarim Basin[J]. JOPC, 2012, 14(2): 197-208.
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