The lower cretaceous oil-bearing reservoir of Hailar-Tamtsag basin is composed of several NNE trending volcanic rift basin group during the early cretaceous. In the early phase, large-scale volcanic debris flow sediment filled in the lacustrine basin center where the source was prolific, which then caused the formation of endogenous volcanic debris flow oil and gas reservoirs that became a new and major reservoir type in the basin. The petrology experiments suggest that the combination of lithology in this reservoir is different from the usual pyroclastic rock such as “tuffaceous sandstone” and “tuff glutenite”. Its mixed facies are caused by rapid accumulation of volcanic debris flow with specific sedimentary origin and paleogeographic environment, which is also a new type of reservoir sedimentary origin on which there is less domestic and international research. The characteristics of this reservoir includes mélange accumulation of tuff and normal glutenite, complex types of pore space, strong water-sensitivity, low permeability, fast change of facies, strong heterogeneity. Since the reservoir is a special type of reservoir with unstable physics and chemistry, it has strong sensibilities and weak cementation, which likely causes strong water-sensitivity, speed-sensitivity, casing damages and deformations, sand productions, and the development is difficult. The investigation of the genetic mechanism of volcanic debris flow reservoir will provide the theoretical basis for optimizing the development method, making rational policy and exploiting economically and effectively.

Based on Chang-6 formation of Yanchang group in Erdos basin, built the geology, 3D rock mechanics and 3D stress field models with core and logging data, and obtained the properties of any point between wellbores. With the fracturing principle, the actual geometry of the fractures can be calculated, and the asymmetry fractures model can be built, including the length, height, width and the direction of the fractures. With the analysis of production history, the residual oil distribution can be obtained, and the multiple fracturing procedure can be designed. With the guidance of the asymmetric fracture models, the daily increase of production is more than 4 ton.

According to the core observation and statistics of physical properties, it is found that weathering, tectonism, lithology and litho-facies are the predominant factors of volcanic reservoirs in Carboniferous of Junggar Basin. The reservoir space includes primary fractures, primary porosity, secondary porosity and secondary fractures. The permeability is mostly controlled by fractures. Weathering crust is the main reservoir of volcanic rock in Carboniferous. High quality reservoirs are mainly located 250 m from the top of weathering crust. Among all the high quality reservoirs, the paleohigh around the depression is the better position. As the distance from the top of weathering crust increases, the filling degree of fractures as well as porosity becomes higher and this degrades the reservoir quality.

The core samples of igneous rock formations with low permeability and low porosity in Jilin Changshen well block are tested for their pressure sensitivity. The result shows that permeability recovery rate of these samples is not more than 11%, which indicates high pressure sensitivity of the formations. By observing core samples and comparing the result of pressure sensitivity tests with those from igneous rock core samples of other regions, it shows that the pressure sensitivity of igneous rock formations is relevant to lithology, structure, construction, development and type of porosity and fracture. Different from the unitary diagenesis of sandstone, the complex diagenesis of igneous rock leads to different pressure sensitivity in different areas. Therefore the pressure sensitivity of different igneous rock formations should be treated differently. Meanwhile, pressure sensitivity of a certain well may not be the same in different igneous layers.

The enriched stable isotope tracer technique combined with Neutron Activation Analysis (NAA) and differential centrifugation was utilized to investigate the subcellular distribution of rare earth elements Sm and Yb in rat liver. ¹⁵²Sm and ¹⁶⁸Yb were selected for experiment as representatives of the light and heavy REEs, respectively. In order to verify the analytical quality, some standard reference materials were used. The distribution in subcellular fractions was similar for Sm and Yb, the highest contents of Sm and Yb were found in mitochondria, while the lowest in nuclei.

The contents of 8 rare earth elements(REEs)in chloroplasts of Brassia napus were determined by instrumental neutron activation analysis. The results indicated that there were trace amounts of REEs in the chloroplasts, which corresponded to 1 atom of REEs per 2000 chlorophyll molecules. This content was lower than the microelements already known essential for the process of photosynthesis such as Fe, Mn and Cu.