关键词: 兴隆台潜山, 结晶基岩, 岩石物理特征, 测井曲线, 储层特征

Abstract:

An important progress has been made in exploring the crystal basement of the Xinglongtai buried-hill in the Liaohe Depression recent years. The deep drilling, such as in wells Xg7 and Xg8, has proved the existence of large-scale buried-hill inside reservoirs with a thousand-meter-range oil show, which have approximately one hundred million tons of reserves. An in-depth study on drilling cores and rock cuttings revealed that the Archaeozoic Xinglongtai crystal basement was made up of metamorphic and magmatic rocks, the former constituted mainly the buried-hill, while the latter formed hysterogenic viens dominated by well-developed neutral-acid magmatic rocks with a thickness from 1 to 50 meters and distributed at intervals in archaic metamorphic rocks of the buried-hill. A correlation of lithology with logging traces was established by studying physical properties of rocks, the lithology of crystal basement was identified through the dynamic integration of logging curves such as GR, DEN and CNL. The reservoir space of the buried-hill consisted mainly of tectonic fractures and broken intergranular pores. The development of reservoirs significantly depended on differences in lithology and the extent of tectonic reworking, namely, lithology was the primary factor under the same stress or vice versa. A predominant lithologic series was formed usually based on the quantity of dark minerals. These updated achievements have effectively guided the reserve calculation, exploration and development of the Xinglongtai buried-hill.

Key words: Xinglongtai buried-hill, crystal basement, physical property of rock, logging curve, reservoir character