China Petroleum Exploration ›› 2018, Vol. 23 ›› Issue (5): 88-93.DOI: 10.3969/j.issn.1672-7703.2018.05.011

• PETROLEUM ENGINEERING • Previous Articles     Next Articles

A method for making and calibrating synthetic records of horizontal wells: a case study on Well Zhuang 202-Ping 1 in the Zhanhua sag

Bi Junfeng1, Cai Juhong2   

  1. 1 Exploration and Development Research Institute, Sinopec Shengli Oilfield Company;
    2 Oil Development Center, Sinopec Shengli Oilfield Company
  • Received:2017-06-19 Revised:2018-03-25 Online:2018-09-15 Published:2018-09-15
  • Supported by:
     

Abstract: The penetrating direction of a horizontal well is opposite to real stratigraphic sequence, so that the interface information reflected by synthetic records is inconsistent with real seismic sections. A practical and effective method for making and calibrating synthetic records is proposed for horizontal wells. First, the AC and density curves are calculated from the bottom of a horizontal well upward, based on the horizontal section logging curve, and an imaginary vertical well is made at the bottom of the horizontal well, then the reverse AC and density curves are imported to the vertical well after dip transform, and acoustic impedance and reflection coefficient are calculated. Second, seismic data are flattened along the bottom of the inclined layer, and based on which seismic wavelets are extracted and convoluted by the reflection coefficient to make a synthetic seismic record. Finally, well-seismic calibration is done by comparing the synthetic seismic record with the seismic trace near the imaginary vertical well. The method has been applied to make and calibrate the synthetic record of Well 202-Ping 1 in the Zhanhua sag in the Jiyang depression. The result defines the corresponding relationship between the members of the Mesozoic formation and thick oil layers on the seismic section, achieving the purpose of reservoir calibration in the horizontal well.

 

Key words: horizontal well, drilling trajectory, stratigraphic sequence, reverse logging curve, flattening seismic data, synthetic record

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