METHOD FOR DETERMINING THE LINEAR RESOURCES OF THE HYDROCARBON RESERVES OF A NON-TRADITIONAL RESERVOIR OF THE JURASSIC HIGH-CARBON FORMATION

摘要

FIELD: geochemistry.;SUBSTANCE: invention relates to the ways and methods for petrophysical and geochemical studies of the core collection of an unconventional reservoir of the Jurassic high-carbon formation (JHCF) and can be used in determining the linear oil and gas resources, technically extracted from the JHCF, taking into account their varying degrees of connectivity with the rock matrix and filling the interconnected and/or non-communicating pores. Problem is solved in that the method of determining linear resources (q[t/m²]) of hydrocarbons (HC), potentially capable of extracting from the rocks of the Jurassic high-carbon formation (HCF), includes the following successive steps: the selection of blanks from the core column; separation of each selected blank into five samples No. 1, No. 2, No. 3, No. 4, No. 5, at the same time, on each obtained sample No. 1, the porosity of the rock (Kpd.din) is measured using the gas-luminometric method, on each obtained sample No. 2, pyrolytic studies are performed with the following parameters: S₁2 [mg hydrocarbon HC/g of the rock], S₂2 [mg HC/g of the rock], each sample No. 3 obtained is sequentially extracted with an organic solvent (OS) and pyrolytic studies of the extracted sample with the following parameters are determined: S₁3 [mg HC/g of the rock], S₂3 [mg HC/g of the rock], TOS3 [weight %]; obtaining a core column model with division into intervals characterizing individual petrogeochemical types (PGCT) of rocks, for which purpose diagrams of parameters Kpd.din are constructed, S₁2, S₂2, S₁3, S₂3, TOS3 from the depth of extraction of core samples, identifying intervals characterized by Kpd.din values and/or pyrolytic parameters S₁2, S₂2, S₁3, S₂3, TOC3, which are within the error of the approximation method, and combining them into one PGHT with the determination of the total power of each where is the power of the k-th interval, referred to the n-th PGHT of rocks; determination of the content of freely mobile hydrocarbons located in open pores (FM HC OP), by averaging all Kpd.din values for each PGHT and multiplying by the density value of oil in reservoir conditions; selection for each PGHT of the rock of at least one set of samples No. 1, No. 4 or No. 5 from one blank with the subsequent determination of the content for each set: free-unmoving hydrocarbons, being in a sealed form in open pores (FU HC OP), sorbed hydrocarbons in open pores (SHC HC OP), free-stationary hydrocarbons in closed pores (FU HC CP), sorbed hydrocarbons in closed pores (SHC HC CP), hydrocarbons potentially extracted from kerogen (HC K); determination of hydrocarbons: SOHC HC OP, FU HC OP, SHC HC CP, FU HC CP, HC K, for each selected PGHT of the rock with the subsequent determination of the values of linear resources (q) per well, by multiplying the obtained corresponding HC contents with the power of the corresponding PGHT and then summing the obtained values.;EFFECT: technical result achieved when using the proposed method is to provide the possibility of a reliable assessment of the linear resources of hydrocarbons, oil and gas, in particular, of those ones which can be technically extracted from the JHCF while reducing the time to conduct assessment studies due to the isolation and association of rocks with similar values of porosity and pyrolytic parameters into a single PGHT.;4 cl, 10 dwg, 8 tbl