Ordovician Fractured-vuggy Diagenetic Trap and Its Genesis in Hanikatam Formation

doi:10.11885/j.issn.1674-5086.2018.06.06.02

Abstract

Abstract: This study focuses on the analysis of Ordovician fractured-vuggy carbonate diagenetic trap of the Halahatang oil reservoir in the north of Tarim Basin. By combining static and dynamic information such as regional geology, drilling time log, acid fracturing, pressure testing, and production dynamics, we discuss the dynamic identification method, characteristics, and genesis of traps. We hold that the wellhead oil pressure drop can be used to replace the formation pressure drop for plotting the N_p-△p diagram due to the high permeability of fractured-vuggy carbonate oil reservoir. The diagram can be further used to determine if the oil reservoir is an open reservoir or a closed diagenetic trap reservoir. The total number of fractured-vuggy diagenetic traps is relatively small in the area. Cave reservoir being the major type of reservoir. Combinations of multiple other trap elements developed with various lithology of trap cover, reservoir cover combination, and diverse occlusion conditions. The multi-stage filling and stacking is found to be the fundamental cause of the closure of fractured-vuggy diagenetic trap. The diagenetic filling caused by large-scale rapid settlement since the Neogene may be the direct cause of the closure of most fractured-vuggy diagenetic traps. These settlements simultaneously result in abnormal formation pressure in some parts of the reservoir.

Key words: Hanikatam, fractured-vuggy reservoir, diagenetic trap, trap genesis, abnormal formation pressure

CLC Number:

TE122

MIN Huajun, JIA Xiangjin, TIAN Jianjun, CAI Quan, ZHAO Shaoze. Ordovician Fractured-vuggy Diagenetic Trap and Its Genesis in Hanikatam Formation[J]. 西南石油大学学报(自然科学版), 2019, 41(5): 33-44.

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