A Calculation Model of Oil and Gas Saturation in Shale

Abstract

The invention discloses a computing model of mud shale oil gas saturability. The computing model comprises the steps that A. an equivalent physical model is established; B. an assumed condition is given out; C. a mathematical model formula is determined; D. various parameters in the model are determined; E. rock electric experimental data formula parameter a, b, m and n fitting is carried out; and F. model verification is carried out. The non-Archie phenomenon of a mud shale oil storage layer caused by the problems that framework minerals are complex, a pore structure is complex, and pore wettability is complex can be avoided, the oil gas saturability of the mud shale storage layer is accurately computed, help is provided for a logging evaluation storage layer and oil field development, the unparalleled advantages which other saturability models do not have are achieved on mud shale water saturability computing are achieved, practical application effect is obvious, and accordingly great promotion value is achieved. In current public-published literatures and commercial application software, similar method providing and application do not exist.

Description

technical field [0001] The invention relates to a method for evaluating oil and gas saturation in the field of geophysical well logging in the petroleum exploration and development industry, in particular to a calculation model for mud shale oil and gas saturation. Background technique [0002] At present, there are three main methods to obtain the original oil saturation at home and abroad. One is to directly measure the cores obtained by oil-based mud coring or sealed coring; the other is to use the logging saturation interpretation model based on petrophysical experiments. , mainly including Archie's formula and its derived two-water model, two-porosity model, three-water model, etc.; the third is to use the capillary pressure curve to calculate the original oil saturation. key research content. [0003] In 1942, Archie established an experimental model for determining the water saturation of pure sandstone formations, effectively linked resistivity logging and porosity ...

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Problems solved by technology

[0024] The purpose of the present invention is to solve the technology that the existing water saturation model is not applicable due to the existence of special minerals such as organic matter and pyrite in mud shale reservoirs, and the wettability is complicated (organic pores are wet with oil, and inorganic pores are wet with water). To solve this difficult problem, a method for establishing a model considering the wettability of shale and the conductivity saturation of mineral components is proposed

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