Oil & Gas Geology ›› 2022, Vol. 43 ›› Issue (3): 528-541.doi: 10.11743/ogg20220304

• Petroleum Geology • Previous Articles     Next Articles

Study and practice of characterizing hydrocarbon charging capacity of different fault zones, Shunbei area, Tarim Basin

Wenge Hu1,2,3()   

  1. 1.Northwest Oilfield Company,PetroChina,Urumqi,Xinjiang 830011,China
    2.Petroleum Exploration and Production Research Institute,SINOPEC,Beijing 100083,China
    3.Key Laboratory of Enhanced Oil Recovery for Carbonate Fracture?Cavity Reservoirs,SINOPEC,Urumqi,Xinjiang 830011,China
  • Received:2021-03-14 Revised:2022-03-14 Online:2022-06-01 Published:2022-05-06

Abstract:

The Middle-Lower Ordovician carbonate reservoirs along strike-slip fault zones in the Shunbei area, Tarim Basin, are hydrocarbon bearing and have been the main targets of exploration and development for oil and gas. However, hydrocarbon charging efficiency at difference parts of the zones varies greatly, posing challenge for accurately evaluating and describing the dominant parts of charging, which in turn determines the efficiency and scale of exploration and development in the Shunbei area. To tackle the problem, this study is focused on the relationship between the faults and reservoirs in two of the fault zones (No.1 and 5) to discuss for the first time the main factors affecting the hydrocarbon charging efficiency in the zones that are reflected through the internal structure of the zones, the local strain intensity as well as the size and direction of the present in-situ stress. Based on the study, the concept of “charging body” is proposed and implemented to semi-quantitatively determine the vertical transport of hydrocarbons at different parts of the zones with results fitting well with the actual production data. This method not only provides strong theoretical support for segmental assessment of the zones and description of “high-speed channels” for vertical hydrocarbon migration, but also serves as a guidance to rapidly increasing reserves and promoting production with less wells in the Shunbei area.

Key words: hydrocarbon charging efficiency, hydrocarbon transport intensity, charging body, fault-vuggy reservoir, strike-slip fault zone, Shunbei area, Tarim Basin

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