Fine identification method for advantageous lithology of shale oil

Abstract

The invention discloses a fine identification method for the advantageous lithology of shale oil. The fine identification method for the advantageous lithology of the shale oil comprises the steps that three main mineral components are selected to establish a board chart according to X-ray diffraction mineral component data of lithic fragment or core sample minerals in a shale bed section, and fine division of the shale type lithology is achieved; and the shale stratum advantageous lithology division standard is established according to gas logging parameters, rock pyrolysis analysis and brittleness index data. According to the fine identification method for the advantageous lithology of the shale oil, the board chart is established through the X-ray diffraction mineral component data to distinguish the lithology, and the advantageous lithology of a shale stratum is judged by combining the gas logging parameters, rock pyrolysis analysis and the brittleness index data; firstly, the problem that denomination of the shale oil lithology is not clear is well solved, and the lithology can be accurately identified; and secondly, the data capable of identifying the advantageous lithology in the lithology are provided for oil testing and stratum selecting, the result meets the engineering service needs, and a reliable basis is provided for efficient oil and gas resource development of the shale stratum.

Description

technical field [0001] The invention relates to unconventional oil and gas exploration and development technology, in particular to a method for finely identifying dominant lithology of shale oil. Background technique [0002] At present, there are many lithology identification methods for mud logging, which play an important role in rock naming and geological stratification. However, some of these methods are artificial macroscopic identification or microscopic identification under a microscope. Pure mineral composition identification can hardly meet the requirements of shale formations. The need for fine identification of lithology makes shale oil lithology classification unclear and name inaccurate. [0003] The dominant lithology in shale formations refers to rocks with better oil and gas shows, richer organic matter and movable hydrocarbon content, better reservoir quality, more brittle mineral content, and easier to undergo fracturing engineering reformation. In the p...

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Problems solved by technology

[0002] At present, there are many lithology identification methods for mud logging, which play an important role in rock naming and geological stratification. However, some of these methods are artificial macroscopic identification or microscopic identification under a microscope. The simple identification of mineral components can hardly meet the requirements of shale formations. The need for fine lithology identification makes shale oil lithology classification unclear and name inaccurate

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