The present invention relates to a system for analysing volatile organic compounds (VOCs) in soil comprising an apparatus and a soil VOC sensor strip, wherein the apparatus comprises a sampling chamber for receiving soil, a sensor strip aperture in the sampling chamber for positioning the sensor strip in fluid communication with the sampling chamber, a power source and an electrical resistance detector, wherein the sensor strip comprises a flexible substrate with a first surface and an array of semiconductor polymer sensors arranged on the first surface, wherein each of the semiconductor polymer sensors comprises a pair of electrodes, wherein the pair of electrodes comprises a first electrode and a second electrode, wherein a semiconductor polymer is disposed between the first electrode and the second electrode, and wherein the sensor strip is electrically connectable to the power source and the electrical resistance detector.

An experimental device and method for supercritical CO.sub.2/H.sub.2O mixed fluid huff and puff for shale oil development includes a CO.sub.2 storage tank, a water vapor generator, a mixing vessel, and a core holder; the CO.sub.2 storage tank and the water vapor generator are in communication with the mixing vessel; a first pressure gauge and a hygronom are connected to an upper end of the mixing vessel, and a displacement pump is connected to a lower end of the mixing vessel; the mixing vessel is connected to an inlet end of the core holder; the core holder is connected to an inlet end of a drying pipe, and the measuring cylinder is disposed upside down in a liquid containing dish, where the liquid containing dish and the measuring cylinder are filled with a saturated sodium carbonate solution.

An open system pyrolysis of a first hydrocarbon source rock sample obtained from a natural system is performed within a pyrolysis chamber by maintaining the pyrolysis chamber at a substantially constant temperature. Hydrocarbons are recovered from the pyrolysis chamber released by the first hydrocarbon source rock sample. A thermo-vaporization is performed within the pyrolysis chamber on the pyrolyzed sample at a substantially constant temperature. A first hydrocarbon expulsion efficiency of hydrocarbon source rock is determined. A second hydrocarbon rock sample is ground to a grain size less than or equal to or less than 250 micrometers. A second pyrolysis is performed on the ground hydrocarbon source rock sample by maintaining the chamber at a substantially constant temperature. A second hydrocarbon expulsion efficiency of the hydrocarbon source rock in the natural system is determined. The first hydrocarbon expulsion efficiency is verified using the second hydrocarbon expulsion efficiency.

Methods and systems are provided that combine NMR and IR spectroscopy measurements on a rock sample to determine data representing at least one property of the rock sample. In one embodiment, cuttings can be split into first and second lots. Results of an NMR measurement performed on the first lot of cuttings without cleaning can be analyzed to determine pore volume of the cuttings. Results of an IR spectroscopy measurement performed on the second lot of cuttings after solvent cleaning can be analyzed to determine matrix density of the cuttings. Porosity can be determined from the pore volume and matrix density of the cuttings. In another embodiment, combined NMR and IR spectroscopy measurements can be performed on an unprepared rock sample (without solvent cleaning) to characterize properties of kerogen in the rock sample and porosity. In another aspect, a method is provided that employs multi-nucleic NMR measurements to determine porosity.

A multifunctional experimental system for in-situ simulation of a gas hydrate includes a computed tomography (CT) scanning device, a reactor, and a pipeline system. The reactor includes: a reactor upper end cover, a reactor lower end cover, a reactor housing and a clamp holder. A first pipeline channel is formed at a top, an upper groove is formed at a bottom, and a first upper joint is arranged in the upper groove. A second pipeline channel is formed at a side, a lower groove is formed at a top, and a first lower joint is arranged in the lower groove; where two ends of the reactor housing are respectively fixed to the reactor upper end cover and the reactor lower end cover. A top end of the clamp holder is provided with a second upper joint, a bottom end of the clamp holder is provided with a second lower joint.

A method, system and device for comprehensively characterizing a lower limit of oil accumulation of a deep marine carbonate reservoir is provided, aiming to solve the problem that the prior art cannot: accurately determine the lower limit of oil accumulation of the deep marine carbonate reservoir, which leads to the difficulty in predicting and identifying deep effective reservoirs. The method includes: determining lower limit porosity and permeability for oil accumulation based on a boundary line; determining lower limit porosity and permeability for oil accumulation based on a movable oil ratio of a core sample; determining a lower limit pore throat radius for oil accumulation based on a mercury injection experiment; and comprehensively characterizing the lower limit of oil accumulation of a deep marine carbonate reservoir to be predicted. The method, system and device can predict and identify deep effective reservoirs.

An evaluation method for hydrocarbon expulsion of post- to over-mature marine source rocks includes: establishing a hydrocarbon expulsion evolution profile of post- to over-mature source rocks; determining a critical condition for hydrocarbon expulsion from the source rocks, inverting original hydrocarbon generation potential of the source rocks, and establishing a hydrocarbon expulsion model for the source rocks; determining a hydrocarbon expulsion rate and cumulative hydrocarbon expulsion of the source rocks; and calculating hydrocarbon expulsion of the source rocks. The evaluation method establishes a hydrocarbon expulsion model for post- to over-mature source rocks without relying on immature to sub-mature samples. The evaluation method provides a scientific basis for the evaluation of the potential of deep oil and gas resources, and provides strong theoretical guidance and technical support for deep oil and gas exploration.

A method and apparatus for evaluating volumes of discharged hydrocarbon and externally charged hydrocarbon in a mud shale. The method comprises: determining a hydrogen index and a current hydrocarbon generation potential parameter of a mud shale in target block based on total organic carbon test data and pyrolysis analysis test data of the mud shale; determining an original hydrogen index of the mud shale based on the hydrogen index and the pyrolysis analysis test data; and evaluating a volume of discharged hydrocarbon and a volume of externally charged hydrocarbon in the mud shale based on the current hydrocarbon generation potential parameter and the original hydrogen index.

An open path gas detection system includes a transmitter and a receiver. The transmitter is configured to generate illumination, having broadband spectrum, across an open path. The receiver is positioned to detect the illumination from the transmitter after the illumination has passed through the open path. The receiver includes at least one spectrometer configured to determine spectroscopic information of the illumination to identify at least one gas of interest based on the spectroscopic information and provide an output based on the at least one gas of interest.

A hydrocarbon generation pyrolysis simulation experimental device for centrifugal continuous gas sampling of a hydrocarbon source rock, including a centrifugal turntable, a motor, a quartz sample tube, a heating set, a cooling set, a rotary joint mounted coaxially with a rotating shaft of the centrifugal turntable, a vacuum pump, and vacuum gas collecting pipes, wherein a sealing plug is arranged at an orifice of the quartz sample tube, a thermocouple and a first exhaust pipeline connected with an inlet of the rotary joint are mounted on the sealing plug, the rotary joint is communicated with a vacuum pump through a second exhaust pipeline, a plurality of vacuum gas collecting pipes are respectively communicated with the second exhaust pipeline through an electromagnetic valve, a vacuum pump switching valve is mounted on the second exhaust pipeline at an inlet end of the vacuum pump, and a control circuit board is mounted on the centrifugal turntable.