METHOD FOR DETERMINATION OF METALS IN ROCKS AND FLUIDS OF FRACTURE ZONES Russian patent published in 2018 - IPC G01V5/14 E21B49/00 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil and gas geology, including prospecting geochemistry for oil, gas and ore, and can be used in oil exploration and gas for detection in intervals of the intervals of sedimentary rocks of formation water and oil enriched with associated valuable industrially significant metals and their area distribution. To achieve the claimed technical result in the method for determining metals in rocks and fluids of fracturing zones, including selection of rocks, oil and water from wells, the study of samples on a gamma spectrometer and the selection of samples with a high content of uranium and thorium, most effective sequence of analytical procedures of selected samples with a high content of uranium and thorium, as well as improvement of some research methods, was revealed as a result of many years of research. Selected rock samples are examined by IR spectroscopy and data on the composition of ore components in the rock are obtained. Samples of formation waters are investigated by the method of electron emission and determine the composition and concentration of impurity elements. Selected oil samples are dehydrated at a temperature of 60 °C for 5–6 hours and further investigated by energy-dispersion method in combination with electron microscopy for the presence of impurities. Obtained results of the studies of the selected samples of rocks, formation water and oil are compared with the elemental composition of geochemical anomalies and the integral association of components is determined in the samples selected. Further rock samples are examined by the X-ray spectral method, the quantitative content of rare microcomponents of the isolated integrated geochemical association is determined, then conduct their study by energy-dispersive analysis in combination with electron microscopy and obtain data on the mineralogical composition of the identified ore components of practical importance. By subsequent analysis of the obtained data on the elemental composition of rocks, formation waters and oils, the boundaries for development of fracture zones are determined: for low background values of uranium and thorium, and maximum values of the elements of the geochemical association and their distribution by sections and areas determine the spatial orientation of the effect of the fracturing zones within the study area. By range of values of the content of elements from the maximum to the background determine the levels of their ore-bearing manifestation in the sections (intervals of depths) and spread over the area, and within the limits of the influence of fissured zones on the geochemical anomaly, a predictive estimate of the distribution of reservoir rocks with improved reservoir properties by comparing the obtained data on the activity of uranium and thorium, their content in rock, water and oil with geological data on gamma-ray logging.

EFFECT: technical result is a comprehensive study of elements of oil, rocks and formation water, assessment of the composition of all significant associated components and ore in them, optimization of the process of determining the multicomponent composition of samples of rocks, oils and formation waters, which allows to significantly reduce the number of samples and elements analyzed, reduces costs and research time and allows for rapid assessment of the feasibility of integrated resource development in the study area.

1 cl, 5 dwg, 5 tbl