关键词: 水平井, 随钻电阻率测井, 仪器响应, 地层厚度, 围岩, 各向异性

Abstract:

T5B sand reservoir in W oilfield of South America has the characteristics of rapid variation of lateral thickness and lithology and complicated vertical overlap relationship. Thus, it is very difficult to identify and characterize T5B sand. This paper carried out integrated researches including semi-quantitative analysis of the seismic RMS amplitude attribute, constrained sparse spike inversion and pseudo acoustic impedance inversion trying to resolve two specific problems such as poor drilling effect of W-7KH horizontal well and oil-water interface confliction between W-7C well and W-7D well. As a result, amplitude and impedance value of effective T5B sand has been established and the boundaries of T5B sand body have been characterized, and the overlap relationship of sand bodies have also been described so as to resolve the oil-water interface confliction of T5B sand between W-7C well and W-7D well. The research method and result may have good guidance for step out development, horizontal well design and fine reservoir characterization of W oilfield.

Key words: horizontal well, resistivity logging while drilling, tool response, bed thickness, shoulder bed, anisotropy