Abstract:

Based on the drilling data, log information, seismic data and testing results, this paper studied the forming condition and favorable area of oil shale hosted in the 1st member of Qingshankou formation in Songliao basin. The results showed that the maximum thickness of the oil shale in the 1st member of Qingshankou formation reaches 15m, and the burial depth ranges from dozens of meters to 2000 m. The burial depth of oil shale within NonganDenglouku at southeastern Songliao basion is less than 500 m. In addition, three thirdorder sequences are identified in Qingshankou formation. Oil shale in the 1st member of Qingshankou formation is formed in subsiding semicircle of SQ1, depositing in deep lacustrine environment. According to the general exploration degree of the study area, two parameters are involved in the evaluating system: thickness as geological parameter, burial depth as exploiting parameter, and the additional parameter oil content as a reference. This paper established the evaluating system for favorable areas of oil shale in the 1st member of Qingshankou Formation. The evaluating result is as follows: type A areas are NonganZengshengChangchunlingChaoyanggou and northeast of Baicheng; type B area is the southern Denglouku arch; type C area is the outer part of NonganZengshengChangchunlingChaoyanggou.

Key words:  Qingshankou Formation, oil shale, geologic characteristics, forming condition, favorable area selecting