Bedrock lithology identification and physical property calculation method and device

Abstract

The invention provides a bedrock lithology identification and physical property calculation method and device. The method comprises the following steps: a cast thin section of a bedrock sample is analyzed to determine the rock type in the bedrock sample; on the basis of acquiring the data of multiple logging curves corresponding to the depth of bedrock and rock samples, the data of multiple logging curves are intersected in pairs to make scatter plots, and the logging curves which are sensitive to the type of bedrock and rock are selected from the multiple scatter plots; according to the coreanalysis results and logging sensitivity curves, the relationship between logging sensitivity curves and bedrock lithology and bedrock porosity is established, and it is concluded that bedrock binarylithology classification has a good correlation with bedrock porosity, and the rock type and porosity of bedrock non-coring section are determined according to the above relationship. This scheme provides a more reliable method for the identification of bedrock lithology and calculation of physical properties without 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...

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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

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