Porosity logging calculation method for corrosion type reservoir

Abstract

The invention relates to a porosity logging calculation method for a corrosion type reservoir. The porosity logging calculation method comprises the following steps that step 1, according to the characteristics of rock of the corrosion type reservoir, sensitive elements closely related to rock components are optimally selected by adopting correlation analysis of lithology and elements; step 2, data intersection analysis is carried out through porosity (POR) and core density (DEN) of a drilled well, a stratum rock area is divided into a non-corrosion interval, a partial corrosion interval and acorrosion development interval, and the corresponding POR numerical interval ranges are as follows: POR is smaller than 2.2%, POR is larger than 2.2% and smaller than 3.5%, and POR is larger than 3.5%; and step 3, a calculation model for calculating the porosity of the elements is established among the intervals. According to the porosity logging calculation method for the corrosion type reservoir, through intersection of the porosity of the drilled well and the rock density, the stratum rock is divided into the non-corrosion interval, the partial corrosion interval and the corrosion development interval, a porosity calculation model is established by applying XRF element logging data through multiple regression analysis in an interval mode, a calculation result is consistent with the trend of well logging interpretation, and the purpose of obtaining the stratum porosity in the drilling process is achieved.

Description

technical field [0001] The invention belongs to a model for calculating the porosity of formation rocks in mud logging operations, and the working area and formations aimed at are the dissolution type reservoirs of the marine Leikoupo Formation formation in western Sichuan. Background technique [0002] Porosity is one of the key parameters for evaluating formation physical properties. For dissolution-type reservoirs, the rock is dissolved to increase the connectivity inside the rock. It is manifested by the increase of porosity, the higher the degree of dissolution, the higher the value of porosity, the better the quality of the reservoir, so the level of porosity is one of the decisive factors to determine the quality of the reservoir, and it is also an urgent need to obtain during the drilling process. Information. [0003] However, there are currently two methods for evaluating formation porosity: direct and indirect. The direct method is to drill the core to carry ou...

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Problems solved by technology

[0006] In order to overcome the problems in the background technology, the present invention proposes a method for porosity logging calculation of dissolution-type reservoirs, which solves the problem that the porosity of dissolution-type rocks has large differences due to inconsistent dissolution degrees, and can only be analyzed or measured in the laboratory after drilling. well calculation puzzle

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