Characteristics of Bedrock Reservoir and Favorable Exploration Area for Palaeohigh in Songliao Basin

Abstract

In order to further explore bedrock reservoir characteristics, prediction of its exploration area in Palaeohigh of northern Songliao Basin, by using drilling, logging, well logging, seismic, core and experiment analysis data, from the bedrock weathered crust identification, lithology identification, reservoir fracture identification, etc. in Palaeohigh of northern Songliao Basin bedrock article analyzes the reservoir characteristics, and predict the favorable exploration area. The results indicate that granite and granite structural breccia are the dominant rocks and control the development of reservoir. The weathered crust is the main exploration target layer, with a thickness of 90–330 m. The fracture-cavern reservoir in the interior is a reservoir with great exploration potential. Lithology, weathered, leaching and fracture are the main controlling factors for reservoir formation. It is optimized to select 8 favorable exploration areas, and one of the 4 completed risk exploration Wells is an industrial gas flow. The horizontal well has obtained high yield industrial gas flow, and the bedrock weathered crust has achieved a production breakthrough. The research results provide scientific basis for the exploration and deployment of bedrock in the ancient central uplift belt, and have important guidance and reference significance for future risk exploration and research.