Method for quantitatively analyzing ultra-deep gypsum salt rock and dolomite coupling mechanism

Abstract

The invention discloses a method for quantitatively analyzing an ultra-deep gypsum salt rock and dolomite coupling mechanism. The method comprises the following steps of: (1) respectively acquiring geological background data, classic field geological outcrop profile measurement data, drilling and logging data and seismic data by taking a Sichuan basin carbonate rock reservoir as an object; (2) according to the data obtained in the step (1), determining the basic geological characteristics of dolomite by using sedimentology, petroleum geology theories and various geochemical test analysis, anddetermining the types of dolomite and petrology and distribution rules of various dolomites; and (3) according to the petrology and distribution rule of various dolomites, analyzing the form and formation mechanism of various dolomites and the quantitative relationship between the dolomites and gypsum salt rock, and finally determining the coupling relationship. By judging the source, the seepagedirection, the path and the like of dolomitic fluid, the coupling relation between the dolomitic fluid source and quantification of the bed series and gypsum salt rock is defined, and the method has important guiding significance for oil and gas exploration.

Description

technical field [0001] The invention relates to a method for quantitatively analyzing the coupling mechanism of ultra-deep gypsum-salt rock and dolomite. Background technique [0002] In carbonate formations, high-quality oil and gas reservoirs often undergo dolomitization, and most oil and gas are rich in carbonate dolomite reservoirs. In the deep-ultra-deep carbonate formations in the Sichuan Basin, it was found that dolomite is developed and associated with evaporites such as gypsum salt, and gypsum salt exists above or below it. This phenomenon indicates that the development of dolomite is associated with the deposition of gypsum salt some sort of coupling. [0003] At present, most of the traditional technical means are to analyze the sealing conditions of gypsum-salt rock formations as oil and gas reservoirs. At the same time, the TSR reaction of gypsum-salt rock formations themselves will generate hydrogen sulfide, thereby improving the reservoir physical properties ...

AI Technical Summary

Problems solved by technology

However, the existing technical means have not conducted in-depth research on the close relationship between gypsum-salt rock and dolomite reservoirs, and due to the strong heterogeneity of gypsum-salt rock and dolomite, it is difficult to carry out accurate quantitative analysis