Critical review of the uncertainty of Tmax in revealing the thermal maturity of organic matter in sedimentary rocks

Experimental evaluation of thermal maturity of crude oil samples by asphaltene fraction: Raman spectroscopy and X-ray diffraction

An evaluation of the potential shale gas play and geological carbon dioxide (CO2) storage from the Triassic Huai Hin Lat Formation in Thailand was performed based on field observations and mineralogical and geochemical data. This study was mainly focused on mudstone samples in some parts of the Huai Hin Lat Formation. The samples can be divided into three groups based on their mineral compositions as follows: coaly mudstone, carbonate-siliceous mudstone, and carbonate mudstone. The brittleness index based on their mineral compositions indicates that the samples show ultra-high carbonate and quartz contents, which suggests a good hydraulic fracture candidate. Total organic carbon and extractable organic matter of the samples represents poor to excellent generation potential for hydrocarbon source rock with type III kerogen. The depositional environment shows that the Huai Hin Lat Formation occurs in anoxic to suboxic conditions in an aquatic depositional environment. The formation is suitable for geological CO2 storage, which may reduce CO2 during petroleum production and increase the production rate. Consequently, results from this study are useful for unconventional shale reservoir exploration and carbon storage technology in Thailand and adjacent countries.

Geochemical characteristics of shale gas formation and the potential for carbon storage in Thailand: An example from the Triassic Huai Hin Lat Formation

The invention discloses a high-flux heavy oil four-component measuring device and method. The high-flux heavy oil four-component measuring device and method comprises an air source of an automatic pressurizing unit, the air source of the automatic pressurizing unit is conveyed through an air path pipeline, the part, after a first-stage pressure reducing valve and a first-stage pressure gauge, of the air path pipeline are divided into four paths, each path is connected with a component measuring device correspondingly, each component measuring device comprises a second-stage pressure regulatingvalve, a second-stage pressure gauge and a sealing rubber plug which are connected with each other through the air path pipeline, each component measuring device is connected with a corresponding detector at the lower end of the component measuring device through a chromatographic column, a corresponding receiving bottle is arranged at the tail end of each detector, a chromatographic tube is arranged on the outer side of each chromatographic column, the upper part of each chromatographic tube is provided with a vibration generator of an automatic chromatographic column filling unit for vibration adjustment, a circulating water inlet is formed in the lower side of each chromatographic tube, a circulating water outlet is formed in the upper side of each chromatographic tube, the circulatingwater inlet of the first group of the component measuring device is connected with an outlet of a constant-temperature circulating water bath, and a circulating water outlet of the last group of thecomponent measuring device is connected with an inlet of the constant-temperature circulating water bath. The high-flux heavy oil four-component measuring device and method has the characteristics ofautomatic chromatographic column filling, automatic pressurization and automatic separation state detection.

High-flux heavy oil four-component measuring device and method

The invention provides a method for separating an alkylbenzene compound in petroleum. The method comprises the following steps of using a ZSM-5 molecular sieve to separate a component containing a branched alkyl structure, and a component containing a linear alkyl structure from a crude oil sample; using neutral aluminum oxide to respectively separate an isomeric saturated hydrocarbon component, a branched alkyl monocyclic aromatic hydrocarbon component and a branched alkyl polycyclic aromatic hydrocarbon component from the component containing the branched alkyl structure, and separate a normal saturated hydrocarbon component, a linear alkyl monocyclic aromatic hydrocarbon component and a linear alkyl polycyclic aromatic hydrocarbon component from the component containing the linear alkyl structure. The invention also provides the alkylbenzene compound obtained by using the separating method and an application thereof in isotope analysis of monomer hydrocarbon. By adopting the technical scheme, the method has the advantages that the operation is simple and convenient, and the separating effect and repeatability are good.

Method for separating alkylbenzene compound in petroleum

The rock pyrolysis parameter Tmax is an important index to evaluate the maturity of organic matter in source rocks. However, during the use of Tmax, it is found that the Tmax value of some samples does not conform to the thermal evolution law of organic matter when evaluating the maturity of organic matter, which affects the accuracy of geological applications. Studying the influencing factors of the rock pyrolysis parameter Tmax analysis data is beneficial to improve the experimental method to ensure the accuracy of the experimental data, and it is of great significance to the correct evaluation of the source rock type and maturity of the source rock. In this paper, the effects of sample mixing uniformity, sample weight, soluble organic matter and minerals on the rock pyrolysis parameter Tmax are analyzed experimentally. It is concluded that the degree of sample uniformity and the amount of sample will affect the results. Soluble organic matter will lead to a decrease in Tmax. With the change of kerogen/clay mineral ratio, the influence of clay mineral on the pyrolysis parameter Tmax.

Influencing factors of the Tmax parameter in Rock-Eval pyrolysis

The utility model provides a pressurizer for column chromatography. The pressurizer comprises a bracket (1), wherein a main gas path (2) and a plurality of branch gas paths (3) communicated with the main gas path (2) are arranged on the bracket (1); a plurality of chromatographic columns (4) corresponding to the branch gas paths (3) are arranged on the bracket (1) and can be communicated with the branch gas paths (3). The pressurizer further comprises a pressure stabilizing air source (5) communicated with the main gas path (2). The pressurizer can be loaded with the chromatographic columns (4) at the same time, and thus component separation experiments with different purposes can be conducted respectively. The pressurizer is particularly applicable to the separation of the same target component of different samples, and thus is more practical in petroleum geochemistry laboratories with more batch analysis tasks.

Pressurizer for column chromatography

The invention provides a method for separating normal paraffin in a petroleum geological sample. The method comprises the following steps: 1, crushing an SAPO-11 molecular sieve, carrying out granularity screening, activating the screened SAPO-11 molecular sieve in a high-temperature furnace; 2, filling a chromatographic column with the activated SAPO-11 molecular sieve; 3, transferring the dissolved saturated hydrocarbon sample into the chromatographic column obtained in the step 2; 4, eluting by an eluant to obtain a mixed solution containing normal paraffin and cycloparaffin; 5, transferring the eluted SAPO-11 molecular sieve with which the chromatographic column is filled, volatilizing the residual eluant, and dissolving by using a mixed solution of a hydrochloric acid and a hydrofluoric acid, so as to obtain an acid solution; and 6, extracting the acid solution obtained in the step 5 by using an organic solvent, so as to obtain the normal paraffin. By adopting the method, the good separation of the normal paraffin in the petroleum geological sample can be achieved under the low experimental facility configuration condition, and the method is good in stability and convenient to operate.

Method for separating normal paraffin in petroleum geological sample

The invention discloses a method of acquiring a biomarker compound from bio-degraded crude oil. The method includes the following steps: (S1) extracting asphaltene from the bio-degraded crude oil; (S2) oxidizing the asphaltene to obtain an oxidized crude product; and (S3) esterifying the oxidized crude product with an esterification reagent to obtain the biomarker compound. The esterification reagent is a boron trifluoride methanol solution, diazomethane or trimethylsilane diazomethane. When the asphaltene is extracted from the bio-degraded crude oil, the asphaltene is oxidized so that the compounds, which are coated by or bonded to the asphaltene, having an aromatic ring structure can be converted into corresponding carboxylic acids to obtain a corresponding oxidized crude product. The oxidized crude product then is esterified to convert the carboxylic acid into esters. The esters can be free from being coated by or bonded to the asphaltene and be dissolved in a chromatographic solvent, thereby providing a basis for oil-source correlation of the biomarker compound and providing a basis for analyzing information of the bio-degraded crude oil.

Method of acquiring biomarker compound from bio-degraded crude oil

The invention provides a column chromatography pressurization device which comprises a bracket (1) The bracket (1) is provided with a main gas path (2) and a plurality of branch gas paths (3) communicated with the main gas path (2), wherein multiple chromatographic columns (4) corresponding to the branch gas paths (3) are arranged on the bracket (1) and are communicated with the branch gas paths (3) The column chromatography pressurization device also comprises a pressure stabilization gas source (5) communicated with the main gas path (2) The column chromatography pressurization device can be simultaneously loaded with the multiple chromatographic columns so as to respectively execute different target component separation experiments The column chromatography pressurization device is particularly suitable for separation of the same target component of different samples, so that the column chromatography pressurization device is practical in an oil-gas geochemical laboratory with multiple batch analysis tasks

Ma Wanyun

Papers

Influencing factors of the Tmax parameter in Rock-Eval pyrolysis

Pressurizer for column chromatography

Method for separating normal paraffin in petroleum geological sample

Method of acquiring biomarker compound from bio-degraded crude oil

Column chromatography pressurization device