Reservoir Formation Patterns in the Strike-slip Fault Zone of the Halahatang Oilfield

doi:10.11885/j.issn.1674-5086.2018.08.20.02

Abstract

Abstract: Massive strike-slip fault zones are key factors for reservoir formation in the Ordovician fractured-vuggy carbonates. The Halahatang Oilfield is on the western slope of the Tabei Uplift. The fault displacement of the strike-slip faults in this region is relatively small. As a result, it is difficult to identify these faults and thus the exploration and exploitation of the oil field is restricted. This study utilized the evolutionary characteristics of the strike-slip faults in the oilfield and formulated a multiplefiltering-based research method for explanatory processing of seismic data. This was applied to the detailer depiction the strikeslip fault zone in detail and determine the spatial distribution pattern of the faults to investigate the reservoir control mechanism of the strike-slip fault zone. It was found that the strike-slip fault zone enables oil and gas to flow. A descriptive technique for fault-karst carbonate reservoirs based on the fault zone was then developed and a formation model for the fault-karst carbonate reservoirs in the Halahatang Oilfield was established. It was concluded that each of these fault-carbonate reservoirs was formed in one single carbonate system and they were interconnected in a complicated manner. Through detailed carving of fracturedvuggy systems and prediction of fractures after superimposition, an evaluation method is proposed to measure the potential of the fault-karst carbonate reservoirs in the Halahatang Oilfield.

Key words: strike-slip fault zone, fault-karst carbonate reservoir, carbonate reservoir, fractured-vuggy system carving, Halahatang Oilfield

CLC Number:

TE122

ZHANG Yintao, SUN Chong, WANG Xuan, YUAN Jingyi, YIN Huairun. Reservoir Formation Patterns in the Strike-slip Fault Zone of the Halahatang Oilfield[J]. 西南石油大学学报(自然科学版), 2020, 42(1): 10-18.

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