Lithologic Reservoirs ›› 2023, Vol. 35 ›› Issue (3): 152-160.doi: 10.12108/yxyqc.20230313

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Characteristics and reservoir accumulation model of Ordovician fault-controlled fractured-vuggy reservoirs in Shunbei oil and gas field，Tarim Basin

BU Xuqiang, WANG Laiyuan, ZHU Lianhua, HUANG Cheng, ZHU Xiuxiang   

  1. Research Institute of Exploration and Development, Northwest Oilfield Company, Sinopec, Urumqi 830000, China
  • Received:2022-08-18 Revised:2022-09-28 Published:2023-04-25

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Abstract: Shunbei oil and gas field is an important oil and gas producing area in Tarim Basin. Based on drilling performance，core analysis，logging and seismic data，combined with acid fracturing curve and well test data， the characteristics and reservoir accumulation model of Ordovician fault-controlled fractured-vuggy reservoirs in Shunbei oil and gas field of Tarim Basin were studied. The results show that：（1）Fault-controlled fractured-vuggy reservoir of Ordovician in Shunbei oil and gas field is a special type of reservoir formed with the development of strike-slip faults. Vertical to the fault zone，multiple groups of fractured-vuggy aggregates composed of bedrockfracture zone-cave zone are developed，and cave zone and fracture zone are the main reservoir spaces. The seismic identification feature of large-scale reservoirs is fault-bead-disorder strong reflection.（2）The reconstruction curve of large-scale fault-controlled fractured-vuggy reservoirs in the study area has the characteristics of low initial pump pressure，large maximum pressure drop and low pump stop pressure. The drilling pressure recovery curves of fault zones ①，④ and ⑧ of the NE fault system are in a W-box shape.（3）According to the characteristics of seismic response and the shape of well test pressure recovery curve，the fault-controlled fractured-vuggy reservoirs in the study area can be divided into two types： cave type and fracture type，and they can be subdivided into four categories according to the shapes of pressure recovery curves： fractured-multi-cave type，fracturedcave type，cave-fracture type and fracture type.（4）The fault-controlled fractured-vuggy reservoirs in the study area have oil source from Yuertusi Formation，and migrate along strike-slip faults. The pores and fractures are the reser-voir spaces， and tight carbonate rocks and thick mudstones are the caprocks.

Key words: Acidizing fracturing curve, well test pressure recovery curve, fault zone, fault-controlled fracturedvuggy reservoir, Ordovician, Shunbei oil and gas field, Tarim Basin

CLC Number: 

  • TE122.2
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