Search

This study investigates the characteristics of particles recycled from waste particleboards and the factors that lower the physical and mechanical properties of recycled panels. Hot-pressing with/without adhesive and hydrothermal treatment are applied to the fresh wood particles, and the morphology, surface properties, and mechanical strength of the particles after treatments are investigated. The results indicate that hot pressing causes the densification of particles, resulting in reduced wettability, a low compaction ratio, and a loss of particle strength; thus, the mechanical properties of recycled panels are significantly weak. The residual adhesive also affects the wetting of the adhesive. Hydrothermal treatment helps to recover the cellular structure and compaction potential of recycled particles, thus improving the mechanical properties of recycled panels. The deteriorations in particle qualities are mainly due to densification and residual adhesive, and hydrothermal treatment helps to recover the structure and remove the resin on the recycled particles. [ABSTRACT FROM AUTHOR]

In order to evaluate the potential for oil and gas resources in the deep fault depression of the Northern Songliao Basin, shale from the fourth member of the Yingcheng Formation (K1yc4) in the South Shuangcheng Fault Depression was selected as an example. The organic geochemical characteristics such as abundance, type and maturity from experiments on low-maturity source rock samples, the hydrocarbon generation conversion rate, hydrocarbon generation amount and hydrocarbon generation period of the shale from K1yc4 were evaluated via the chemical kinetics method. The hydrocarbon generation threshold of shale from K1yc4 in the South Shuangcheng Fault Depression was analyzed by examining the organic matter (OM) in shale core samples from K1yc4. Based on the thermal simulations to an approximate buried depth of 750 m, the maximum oil-generation stage corresponds to an approximate buried depth of 1380 m. The amounts of generated oil and gas from the shale in K1yc4 are approximately 2.417 × 108 t and 0.546 × 1011 m3, respectively. The shale in K1yc4 generated crude oil mainly during the sedimentary period of the Qingshankou Formation, Yaojia Formation and Nenjiang Formation, and mainly generated natural gas during the sedimentary period of the Nenjiang Formation. In the South Shuangcheng Fault Depression, the high parts of the local structure are the favorable areas for oil and gas exploration of K1yc4 in the sag zone, which could be used for the combined production of shale oil, tight sandstone oil and conventional oil. [ABSTRACT FROM AUTHOR]

It is of great significance for deep oil and gas exploration to understand the origin and evolution behind overpressure. Overpressure occurs in the deep Shahezi Formation of Xujiaweizi fault depression. However, due to limited degree of exploration, there are some problems in the study area, such as unclear understanding of the origin of overpressure and the vague investigation of overpressure evolution. To clarify the impact of overpressure on oil and gas migration and accumulation in the study area, this study focuses on the research of the origin and evolution of overpressure in the Shahezi Formation of the study area, utilizing single well logging parameters and combining methods such as microthermometry of fluid inclusions, laser Raman spectrum, and basin simulation. The results show that the overpressure of the Shahezi Formation in Xujiaweizi fault depression is primarily generated by hydrocarbon generation pressurization, and the evolution of overpressure is closely related to hydrocarbon generation. The development of overpressure can be divided into two evolutionary stages: early hydrocarbon generation pressurization and late uplift release, with slight variations in different regions. Tight glutenite gas reservoirs in the Shahezi Formation are characterized by continuous charging. The overall charging period ranges from the late Denglouku to the early Mingshui (110‐67 Ma ago). There is an obvious paleo‐overpressure during the gas reservoir formation period. The gas generation period of source rocks occurred approximately 125‐60 Ma ago, and the main gas generation period (112‐67 Ma ago) highly coincides with the period of natural gas charging. The anomalously high pressure during the accumulation period is considered the significant driving force for natural gas charging. In addition, the sustained effect of overpressure provides better conditions for the preservation of tight gas reservoirs within the source. The results of the study are of guiding significance for the in‐depth exploration and development of deep tight sandstone gas in the Shahezi Formation of Xujiaweizi fault depression. [ABSTRACT FROM AUTHOR]