关键词: 水平井, 页岩油, 地质导向, 入窗点, 伽马成像, 标志层, 元素录井

Abstract:

GD block is a pilot area for shale oil development in Dagang Oilfield. Because there was no guidance experience in this area before, and the geologic structure of GD block is complex, it brought difficulties to the geosteering operation of horizontal wells. In view of the geologic structure, sedimentary characteristics and difficult points of geosteering in this area, taking GD 2H well in the block as an example, the whole guiding process was systematically expounded from two stages of the control of landing in the window and horizontal section control. The key points of geosteering technology for shale oil horizontal wells in this block were summarized. In field guidance operation, geologic modeling and real-time guidance tracking were carried out by using geological, seismic and well logging data, and the final reservoir drilling rate reached 100%. Well site application is very effective, which provides first-hand experience for geosteering of similar shale oil horizontal wells in Dagang Oilfield.

Key words: horizontal well, shale oil, geosteering, the point of landing in the window, gamma imaging, marker bed, element logging