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The fluid inclusions characteristics and pore fluid salinity of 56 samples from clastic reservoir of the Lower Cretaceous were analyzed in the Tanzhuang Sag. The authors also discuss the hydrocarbon charge history and the genesis of secondary pores in the Lower Cretaceous. The multipeak distribution of homogenous temperature of the brine inclusions showed that the inclusions captured should be multiperiod fluids at various depths. Comparison of the homogeneous temperature of brine inclusions with the temperature on the burial history curve suggested that the source rocks had entered the stage of large-scale hydrocarbon generation. However, only individual brine inclusions containing methane were found, and no oil-bearing inclusions were seen. The absence of oil-bearing inclusions indicated that no large-scale oil charges and limited favorable mature source rocks were present in the study area. The paleosalinity varied with depth and was divided into three zones, namely two low-value zones in the shallow and deep burial and one high-value zone in the medium burial. The secondary pores were relatively developed in the high-salinity fluid zone. Secondary pores are chiefly related to the inorganic acid associated with dehydration and mutual transformation of clay materials, and to the organic acid released from limited mature organic matter. [ABSTRACT FROM AUTHOR]

A pressure and temperature preservation system (PTPS) was developed for a natural gas hydrates (NGH) sampler. First, some pressure-coring tools for gas hydrate and free gas investigation are reviewed. Then a PTPS with length of 11.2 m and diameter of 60 mm was developed, which can be divided into four parts with a length of less than 4 m for each part. Laboratory experiments showed that this new PTPS was suitable for maintaining the pressure and temperature of ice and water mixture. Further, this new PTPS was applied during the HY4-2006-03 voyage of No. 4 ocean ship on the northern part of the South China Sea, and two pressurized sediments of 85 and 100 cm length were obtained. All laboratory experiments and applications show that the maximum operating depth and sample length of this PTPS are 3,000 m and 10 m, respectively, the PTPS has a good ability of recovering sediment samples on the seafloor and maintaining their original in situ pressure and temperature, meeting the requirement of exploration of NGH in deep-sea shallow sediment layers. [ABSTRACT FROM AUTHOR]

Thermal visbreaking of inner Mongolia oil sand bitumen was conducted at several temperatures for different lengths of time in the laboratory. The viscosity of the thermally-treated oil was reduced dramatically with thermal treatment under the condition of adding 0.3 wt% anti-coking agent, the oil sand bitumen reacting at 410°C and 45 min. The kinematic viscosity (100°C) of visbreaking oil is reduced to 138.25 mm2·s-1 and the qualities of it are conformed to 7# Chinese Standard for Fuel Oil, which can directly be regarded as product. [ABSTRACT FROM AUTHOR]