Research On The Sedimentary Geothermal Resources In North Songliao Basin

As the traditional fossil energy sources become less and less, the development and utilization of the new energy is paid more attention to. Especially, geothermal resource is one kind of outstanding new energy in the crowd. At present, the research and development of geothermal resources focus on high-temperature fracture outcrop. Meanwhile, hidden sedimentary basin has huge resource potential and wide distribution area. However, both in practice and theory, research on geothermal resources in hidden sedimentary basin is at the exploratory stage and hasn't formed a complete theory and method system. Through the study of geothermal reservoir system in the northern Songliao basin, the paper further improves research theories and methods of the sedimentary geothermal resources and provides guidance for development and utilization of geothermal resources in the sedimentary basin.From the perspective of basin analysis, with extensive research, the sources, composition and the transport mechanism of geothermal energy were analyzed carefully as well as main controlling factors about thermal structure was discussed. By using research achievements of the Songliao basin, the circle structure of earth's crust and mantle, volcanic activity as well as substrate composition was analyzed. Besides, geological factors of controlling heat, including the major fault status of deep basement and sedimentary cover, were also analyzed. Based on the analysis of geothermal field conditions such as terrestrial heat flow, formation temperature and geothermal gradient in the study area, the geothermal anomaly area was determined, the master heat is the mantle source, the transmission mechanism is non-conductive lead and the heat source of the basin is fracture. Eventually, the concept model of the geothermal field formation mechanism was established. Combined with the stratigraphic development of the study area as well as the exploration and development requirements of geothermal resources, the upper parts of Yao, Quantou and Qingshankou formations were determined as the key positions of geothermal resources. The 3rd and 4th member of Quantou formation, the 2nd and 3rd member of Qingshankou formation as well as the 1st,2nd and 3rd member of Yaojia formation were determined as target geothermal reservoirs. By using the materials of prospecting wells and oilfield research results, the characteristics of geothermal sedimentary reservoir, lithology features and physical property were analyzed to make the development situation of geothermal reservoir clear.According to the analysis data of water formation, the carrier of geothermal resources the sedimentary basin, namely the chemical field of geothermal water, was studied in detail as well as its physical properties, chemical composition, water-features and variation regular of vertical and planar were analyzed. On the basis of the materials of production test in the study area, the characteristics of hydrodynamic field model, water power unit structure, systems and hydrodynamic hydrodynamic evolution were researched. From the concepts of geothermal system, sedimentary basin elements of geothermal systems were proposed and conceptual model forming the geothermal systems was established. By using "Heat storage method",89.566 billion tons of standard coal resources and the amount of 3.027 billion tons of recoverable resources were determined in the target geothermal layers of abnormal range. With wellhead temperature and the producing energy of geothermal wells, the evaluation of geothermal resources can be established to classify and evaluate geothermal resources and determine the distribution of geothermal resources in favorable areasThe research shows that the anomaly area of geothermal resources in the northern basin is extensive with great development potential. Moreover, to determine resource can provide guidance and reference for the future research on development and utilization of geothermal resources. Furthermore, the paper has proposed fault controlling heat of sedimentary basin, the cognition of non-conductive leading heat transfer and conceptual model of the geothermal hydrocarbon, which will deepen the study of geothermal resources in the sedimentary basin and have an impact on the relevant theories.