Method and device for bedrock lithology identification and physical property calculation

Abstract

The invention provides a bedrock lithology identification and physical property calculation method and device, the method comprising: analyzing the cast body thin slice of the bedrock rock sample to determine the rock type in the bedrock rock sample; obtaining the corresponding depth of the bedrock rock sample On the basis of the multiple well logging curve data, the multiple well logging curve data are intersected in pairs to form a scatter diagram, and the logging curve sensitive to the bedrock rock type is selected from the multiple scatter diagrams; according to the core analysis results Based on the logging sensitivity curve and the logging sensitivity curve, the relationship between the logging sensitivity curve and the bedrock lithology and bedrock porosity is established, and it is concluded that the binary lithology classification of the bedrock has a good correlation with the porosity. Rock type and porosity of uncored sections of bedrock. This scheme provides a more reliable method for identifying bedrock lithology and calculating physical properties in the absence of core data calibration in the new area.

Description

technical field [0001] The invention relates to the technical field of bedrock buried hill binary lithology and porosity calculation, in particular to a bedrock lithology identification and physical property calculation method and device. Background technique [0002] Bedrock is a combination of metamorphic rocks or igneous rocks (regardless of age) unconformably overlying sedimentary sequences, which is the basis for the formation and evolution of basins and one of the important targets for basin exploration. Although bedrock buried hills account for a small proportion in oil and gas exploration and development and are unconventional reservoirs, they can also form world-class large oil fields. [0003] From the perspective of petrology, the lithology of the bedrock is very complex. According to the laboratory casting thin slices of cores and cuttings (cast thin slices are injected into the pore space of rocks with colored liquid glue under vacuum pressure, and after the liq...

AI Technical Summary

Problems solved by technology

Therefore, the use of resistance-neutron intersection diagrams to divide reservoirs may not be widely used

[0004] Due to the complex lithology of the bedrock, which has undergone complex tectonic evolution, postdiagenesis such as weathering and leaching, and hydrothermal action after burial, the relationship between reservoir development and lithology has become very complicated. Petrology Angular rock classification cannot provide a reliable method for the identification of bedrock lithology and reservoir physical property prediction. The key is that the rock matrix density, matrix acoustic wave and matrix neutron values ​​cannot be accurately obtained

Images