Volcanic material-enriched source rock organic carbon recovery method

Abstract

The invention discloses a volcanic material-enriched source rock organic carbon recovery method. The recovery method comprises the following steps: selecting a sample; determining content Z of volcanic materials in source rock; implementing source rock residual organic carbon analysis and kerogen treatment; dividing volcanic material-enriched source rock organic matter types through an element analysis method; calculating an organic carbon recovery coefficient Kc by combining numerical simulation with experiment; fitting related functions of Kc and volcanic material content Z (as shown in specification). The method disclosed by the invention, by recovering residual organic carbon of source rocks differing in volcanic material content, can greatly improve precision of recovering source rock organic carbon; meanwhile, on the basis of researching a research area test data recovery method, the reliability of resource quantity evaluation is improved; the technology fills the blank of volcanic materials in a complex sedimentary structure environment on organic matter abundance recovery, and enriches source rock evaluation theory; according to results, progress of next resource evaluation is greatly promoted.

Description

technical field [0001] The invention belongs to the field of petroleum geological research, and in particular relates to a method for recovering organic carbon of source rocks rich in volcanic substances. Background technique [0002] The kerogen contained in the source rock in the rock is the parent material for the generation of oil and natural gas, and is the material basis for the generation of oil and gas. High-quality source rocks are often developed in quiet lake basins or tranquil sea environments, and their lithology is mainly mudstone, silty mudstone and carbonaceous mudstone. Maturity (vitrinite reflectance Ro) is often between 0.7 and 1.3%. The existing quality and abundance indicators of source rocks mainly refer to the residual organic carbon content TOC, which is also based on the above depositional environment and lithology. However, in the exploration of petroleum-bearing basins, a type of source rocks rich in volcanic substances (mainly feldspar, quartz, ...

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Problems solved by technology

[0006] The disadvantage of the thermal simulation test method is that this method needs to select source rock samples with low maturity, and source rocks rich in volcanic material often have high maturity, so the experimental samples have certain limitations; due to the inductive method, low precision, long analysis cycle, difficult operation

[0015] Disadvantages of the elemental model method are: it is theoretically strong, and it is enough to use high-to-mature samples, but it is difficult to restore the H / C and O / C of the original organic matter, and the experimental cost is high, and there is no correlation between volcanic substances and hydrocarbon sources. rock effect

[0019] The disadvantage of this method is that the key parameters in the formula, the conversion rate of oil and gas, need to be calculated according to the hydrocarbon generation kinetic model and the experimental calibration parameters, and for source rocks rich in volcanic substances, there is no suitable hydrocarbon generation method. The dynamic model is highly theoretical and difficult to operate, and it does not involve the impact of volcanic materials on it

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