A kind of skeleton conductive mixed argillaceous sandstone artificial rock sample and pressing method

Abstract

An artificial rock sample of skeleton conductive mixed argillaceous sandstone and a method for pressing and forming. The main purpose is to solve the problem that the well logging field can only rely on the logging data to evaluate the oiliness of the skeleton conductive low-resistivity oil layer. It is characterized in that: the artificial rock sample is composed of a brass cap drilled with multiple holes, a stainless steel mesh, a PPR pipe, and a mixture of glue, mudstone, and pure pyrite, clay, quartz sand, and glue built into the PPR pipe . The method for pressing the above-mentioned rock samples is as follows: mix quartz sand of four particle sizes according to the mass ratio, press them with pyrite and clay in the same cuboid diagenetic mold in sequence, and measure the thickness of each component after diagenesis; Sand quality and the designed volume content of pyrite and clay can be used to obtain the mass content of pyrite and clay. According to the calculated mass content, the quartz sand, pyrite, clay and glue are evenly mixed and pressed into rock, and then the clay is pressed , made of skeleton conductive mixed argillaceous sandstone cuboid rock.

Description

technical field [0001] The invention relates to an artificial rock sample of skeleton conductive mixed argillaceous sandstone used in the technical field of logging evaluation of low-resistivity oil layers in open-hole wells of oil fields and a pressing and forming method. Background technique [0002] Oil and natural gas are important energy sources for national economic and social development in the world today. After years of exploitation, at present, the exploration and development goals of my country's petroleum industry have turned to complex oil and gas reservoirs such as low porosity and permeability, low resistance, complex lithology and complex storage space, and low resistance oil and gas reservoirs are one of the main research objects with the most potential one. With the deepening of low-resistivity oil and gas reservoir exploration, low-resistivity oil layers containing pyrite conductive minerals have been found in some oil fields, and low-resistivity oil layer...

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Problems solved by technology

However, Clennell et al. did not conduct desaturation experiments on rock samples with different pyrite contents, therefore, it is impossible to establish a suitable relationship among rock sample resistivity, saturation, pyrite content, frequency, formation water resistivity, and porosity. relation

[0003] In conclusion, so far, there have been few experimental studies on the electrical properties of pyrite-bearing rocks, and due to the lack of natural skeleton conductive mixed argillaceous sandstone cores, there is no research on oil and gas pyrite rocks with different shale distribution forms and shale contents. However, the systematic experimental research on rock-electricity laws has not been established, and the relationship between rock sample resistivity and water saturation, pyrite content, shale distribution form, shale content, formation water resistivity, porosity and other parameters has not been established.

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