4 results about "Silicic" patented technology

The invention relates to the technical field of mineral extraction, particularly discloses a method for efficiently extracting barite single mineral in black mudstone rich in organic matters, and solves the technical problems that micron-sized barite in black mudstone cannot be efficiently extracted in the prior art, lattice destruction / isotope fractionation of barite is easily caused in the extraction process, the purity and the recovery rate are low and the like. The purity of the extracted barite single mineral is larger than or equal to 99%, the recovery rate of fine-fraction barite is larger than or equal to 90%, crystal lattices are complete and free of damage, isotope fractionation and component change are avoided, and the high-precision geochemical test requirement can be met; meanwhile, the method is suitable for various sedimentary rocks such as marine / continental black mudstone, shale and siliceous mudstone, and the applicability is wide.

This invention provides a method for predicting vertical sweet spots in high-silica shale, comprising the following steps: S1, collecting shale core samples and obtaining measured experimental data and well logging data of the shale; wherein the measured experimental data of the shale includes measured TOC, NMR porosity, and relative content of silica minerals; S2, establishing the relationship between measured TOC, NMR porosity, and relative content of silica minerals, and determining the lower limits of relative content of silica minerals, TOC, and NMR porosity in the gas-producing section; S3, establishing a calculation model for the relative content of silica minerals in well logging; S4, determining the sweet spot section of the shale; S5, verifying the accuracy of the sweet spot section of the shale. This invention uses the relative content of silica minerals as the key parameter, which is simple and clear; the relative content of silica minerals is also the most important brittle mineral in shale. The higher the relative content of silica minerals, the better the brittleness of the shale, and the more conducive it is to fracturing. Therefore, the high silica content section is also the engineering sweet spot section. This method takes into account the prediction of both geological and engineering sweet spots.

The application provides a method for determining the genesis and sedimentary environment of siliceous rocks by using multi-index comprehensive analysis, relates to the technical field of geological exploration and geochemistry, and comprises the following steps: pretreating a siliceous rock sample to obtain a to-be-tested powder sample; testing the to-be-tested powder sample to obtain the content of corresponding elements; calculating and obtaining a genesis parameter for characterizing the genesis type of the siliceous rock, and then obtaining a genesis type determination result; calculating and obtaining an environment parameter for characterizing the sedimentary environment of the siliceous rock, and then obtaining a sedimentary environment determination result; and comprehensively analyzing and cross-verifying the determination results to form a final discrimination conclusion. The application can effectively distinguish hot water deposition, biological genesis and composite genesis siliceous rocks by comprehensively analyzing multiple indexes such as major elements, trace elements and rare earth elements, and combining multiple graphic cross-verifications, obviously reduces the multi-solution and subjectivity of traditional single-index discrimination, and accurately determines the sedimentary environment such as continental margin and ocean basin through element ratio and graphic analysis.

The application discloses a preparation method of a sample for a fracturing experiment of a paralic shale reservoir, and the method comprises the following steps: obtaining rock samples corresponding to various rock layers of the paralic shale reservoir, wherein the rock layers comprise dense sandstone layers, limestone layers, coal rock layers, carbonaceous shale layers and siliceous shale layers; obtaining core characteristics corresponding to the rock samples of the various rock layers, wherein the core characteristics comprise rock mechanical parameters, rock mineral components and rock particle sizes; determining simulation materials of the various rock layers except the coal rock layers based on the core characteristics, and collecting coal rock in the coal rock layer of the paralic shale reservoir as the simulation material of the coal rock layer; determining a target simulation material ratio of the various simulation materials based on the core characteristics, and preparing the sample for the fracturing experiment of the paralic shale reservoir by using the simulation materials and the target simulation material ratio. The technical scheme provided by the application can improve the feasibility of the fracturing experiment of the paralic shale reservoir.