A method for identification of fine-grained volcanic ash tuffaceous mudstone

Abstract

The invention relates to an identification method of volcanic ash tuffaceous mudstone at particle level, which belongs to the technical field of rock variety identification. The specific steps include: placing the rock thin section of the clastic rock sample in the field of view of the crossed polarizing microscope, so that the minerals to be tested are placed in the first and third limits and are in the extinction phenomenon; insert a gypsum test plate at the corresponding position of the microscope Determining the first-level gray-white interference color of the mineral x1 in the first and third quadrants and the purple interference color of the mineral y1 in the first and third quadrants; the percentage content and the first-level gray-white interference color of the first-level gray-white interference color of the mineral x1 in the first and third quadrants of the visual field Measure the percentage of purple interference color of mineral y1; determine the first-level gray-white interference color of mineral x2 in the second and fourth quadrants and yellow interference color of mineral y2 in the second and fourth quadrant; The percentage content of gray-white interference color x2 and the percentage content of yellow interference color y2. This method can provide the basis for the direction of oil exploration and development and the discovery of new oil fields, and has practical value.

Description

technical field

[0001] The invention relates to an identification method of particle-level volcanic ash tuffaceous mudstone, which belongs to the technical field of rock variety identification, and a method for quickly and accurately identifying particle-level (particle diameter less than 0.01mm) volcanic ash tuffaceous mudstone under a polarizing microscope method. Background technique

[0002] At present, the identification method of particle-sized volcanic ash tuffaceous mudstone in China is based on the Petroleum and Natural Gas Industry Standard SY / T5368--2000 "Identification of Rock Thin Sections" of the People's Republic of China.

[0003] The disadvantage of this method is that it is difficult to distinguish between fine-grained volcanic tuff and argillaceous rock. Because the mudstone debris and volcanic ash tuffaceous debris in the particle-sized volcanic ash tuffaceous mudstone are very fine, the particle size is less than 0.01mm, and they are distributed in aggr...