A lithofacies division method and verification method of inter-salt shale series

Abstract

A lithofacies division method and verification method for inter-salt mud shale formations, belonging to the field of shale oil exploration geology. A method of lithofacies division of inter-salt mud shale series includes determining the bedding thickness of the mud shale through core observation and optical microscope identification of the mud shale, and determining the rock mineral type of the mud shale by using the whole rock mineral analysis to determine the core, The organic matter abundance of shale was determined by pyrolytic organic carbon analysis, and the rock mineral volume content of shale corresponding to the rock mineral type was determined by whole-rock mineral analysis combined with thin section observation under a microscope. According to the principle classification method of "end member", the rock types of mud shale are classified according to the volume content of clastic mineral components, calcite components and dolomite components in mud shale. A verification method for lithofacies division of inter-salt mud shale series, using natural gamma ray spectrum and conventional logging curve characteristics to verify that rocks divided into mud shale with the same lithofacies have the same lithoelectric characteristics.

Description

technical field [0001] The invention relates to the field of shale oil exploration geology, and in particular relates to a method for lithofacies division and verification of inter-salt mud shale layers. Background technique [0002] Unconventional oil and gas resources shale oil and gas exploration and development has achieved great success in the United States, and has now become a hot direction and exploration field of global research. The color, composition, structure, structure, reservoir space characteristics and oil content of shale strata were observed to show strong heterogeneity, which is mainly due to the complex mineral composition, rapid change of lithofacies, and texture. Layer development and other characteristics. Scholars at home and abroad have mainly carried out a lot of research on the types of shale reservoir spaces and achieved fruitful results, but there are relatively few studies on the classification of shale lithofacies, and there is a lack of unif...

AI Technical Summary

Problems solved by technology

Using fine core description and a large number of thin sections, cathodoluminescence, X-ray diffraction energy spectrum analysis, chemical analysis, etc., combined with scanning electron microscope, electron probe and whole-rock X-ray diffraction, it is observed under the microscope that the mud shale laminae in the inter-salt formation are extremely developed; Except for salt minerals, which are easy to identify, terrigenous clasts and carbonate minerals are of micrite grade, which are difficult to identify; salt minerals (mainly glauberite) have various forms and complex origins

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