Searching method of gas and gas-condensate deposits

FIELD: oil and gas industry.

SUBSTANCE: invention refers to search of gas deposits, and can be used for finding hydrocarbon raw material in terrigenous rocks of sedimentary cover. Method involves rock sampling from oil-and-gas bearing deposits during boring process. At that slurry sampled from sedimentary cover areas adjacent to or located just above buried continental rift is used as samples; samples are treated with heated 50% salt acid solution, and occurrence of silica jelly-like mass can mean that deposits are available.

EFFECT: improving accuracy of definition of gas and gas-condensate deposits.

 

The invention relates to the exploration of gas and can be used to detect hydrocarbons in terrigenous sedimentary rocks.

There is a method of detecting oil and gas bearing strata, which consists in determining the indications getcaretpos station appearance of gas in the clay-rich gas coming to the surface in the drilling process (Wadecki JV Drilling oil and gas wells. M.: Nedra. 1978. P.35-36).

However, this method is not possible with sufficient accuracy to predict the approaching oil deposits, since the advent of gas from the wells depends on the breed, which produces drilling.

A known method for predicting oil reservoir, which consists in the selection of rock samples during drilling and measuring their magnetic susceptibility (Grinkevich GI Magnetic survey. M.: Nauka. 1970. S-166).

This method also does not allow accurate approximation to the oil reservoir. This is because the change of the magnetic susceptibility from the depth of the wells is negligible.

There is a method of forecasting the prospective areas for oil and gas, which consists in sampling within the search area, the measurement of magnetic parameters, the heating of the sample up to a temperature of 450-500°, then conducting repeat REGO measurement of magnetic parameters and comparing the measured parameter values before and after heating. By comparing the results to judge the presence of oil or gas. This sampling is conducted from the upper layer of the soil horizon, and the heating is carried out in the presence of an oxidant. In addition, selected background samples and measure their magnetic parameters, and then compare the ratio of the measured parameters values of the samples before and after heating with the value of the background samples. When exceeding the values the relationship more than 2 times judged on the availability of prospective areas for oil and gas. As the magnetic parameters of the chosen magnetic susceptibility, and/or residual saturation magnetization and/or the saturation magnetization. As the oxidizing agent when heated samples using oxygen-containing environment. The method used for the rapid assessment of prospects identified geological structures before setting them deep exploration drilling (see RF patent for the invention №2215309, IPC G01V 9/00).

However, this method is not applicable for the prediction of hydrocarbon deposits in deep-lying rocks of the basement.

Closest to the proposed solution is a way of finding hydrocarbons, which is that they select samples from oil and gas bearing areas with carbonate basement, adjacent to the buried continental paleorift. Measure their magnetic in preemtively. The emergence of the values of the magnetic susceptibility in the range of 13.0·106-31,0·106 judge available deposits (see RF patent for the invention №2276390, IPC G01V 3/08).

However, this method is rather complicated.

The objective of the invention is to improve the accuracy of deposits of gas and gas condensate, to a lesser extent oil, terrigenous sedimentary rocks while simplifying and reducing costs.

The problem is solved in that in the way of finding gas and gas condensate deposits, consisting in the selection of rock samples (sludge) in the process of drilling and processing them with hydrochloric acid, the reaction products of which are judged on the availability of deposits. According to the invention samples terrigenous rocks away from oil and gas bearing areas of the sedimentary cover, adjacent to or directly above buried continental rift, identify development zone laumontite (zeolite) terrigenous sequences of the cover by the emergence of a gelatinous mass of silica (a product of the interaction heated to 50% HCl solution and laumontite), which is judged on the presence of deposits.

The method is implemented as follows.

Within the boundaries of hydrocarbon deposits, concentrated in the sedimentary cover and localized in the fossil paleorift, being processed sludge terrigenous rocks of 50% solution of hydrochloric acid, heated to the temperature of 40°C. Highlighted the depth intervals where the sludge gelatinase, i.e. formed a gelatinous mass. Identify such anomalies with zones neftegazonosnyh (gascondensate-saturated) Sandstone reservoirs of the sedimentary cover, where required tests wellbore at a flow rate of gas, gas condensate and oil.

In terms of the buried paleorift, experienced tectonic-hydrothermal activation, hot fluids, can cause romanticization and calcidiscus, penetrated along the faults in the rocks of the sedimentary cover. They not only metasomatic processed them, but was redistributed hydrocarbons from oil and gas source rocks. In the end, there arise saturated gas, condensate, less oil lamentatione terrigenous complexes, passing in calcitization breed (screens). The combination of saturated hydrocarbon reservoirs and seals is a natural reservoir, the detection of which in the oil and gas areas is extremely important.

The method allows the direct testing of wells, install new prospective for hydrocarbons sections of the sedimentary cover, paired with paleorift, and to anticipate emergency well construction: breakage of the equipment, emission of gas at abnormally high formation pressure, etc.

How POI is ka hydrocarbons, consisting in sampling breed with bearing areas in the drilling process, characterized in that as the samples chosen by cuttings, which are taken from areas of the sedimentary cover, adjacent to or directly above buried continental rift, samples are treated with hot 50%solution of hydrochloric acid, and the presence of deposits is judged by the appearance of gelatinous mass of silica.



 

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Subsurface sampler. // 2347906

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