A New Method for Determining the Layer Mark of Volcanic Rocks

Abstract

The present invention provides a new method of determination of volcanic rock layering marks. The method provided by the invention comprises: performing GR logging aiming at an object volcanic rock interval, and obtaining a GR curve of the object interval; eliminating abnormally high values and abnormally low values in the GR curve based on the available research data; finding out the maximum value GRmax and the minimum value GRmin of the GR of the object interval in the processed GR curve, defining the maximum value GRmax and the minimum value GRmin as the environmental critical level of the GR of the object interval, and calculating an environmental factor [Delta]; drawing a curve chart through the environmental factor [Delta], lining out the baseline of the [Delta] curve in the curve chart, and dividing the curve into different typical regions according to the relative position relation of the [Delta] curve and the baseline through the overall observation, the curve breaks at the cutting line being layering marks, with respect to different rock stratums, between different rock stratums. According to the new method of determination of volcanic rock layering marks, the influence of human factors may be substantially reduced so that GR values in the regions may be unified onto the same comparing platform; and moreover, the accuracy of the layering may be improved, the determination time of the layering may be reduced, and the research cost may be decreased.

Description

technical field [0001] The invention relates to the field of geological exploration, in particular to the field of geological exploration and development of volcanic rocks, in particular to a method for determining layered signs of volcanic rock logging. Background technique [0002] China is rich in volcanic oil and gas resources, and has broad prospects for exploration and development. In recent years, volcanic rock oil and gas reservoirs have become an important field of oil and gas exploration and development, and many volcanic rock oil and gas fields have been discovered successively, such as Qingshen Gas Field, Karamay Gas Field, Niudong Oil Field, and Carboniferous Oil Field in the northwest margin of the Junggar Basin. As of 2012, volcanic rock oil and gas reservoirs have been proven The oil and gas equivalent of more than 1.2 billion tons. [0003] Volcanic rock is the product of volcanic eruption. The original volcanic rock has poor connectivity in reservoir space...

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Problems solved by technology

[0005] In volcanic strata, because the composition of volcanic rock itself interferes strongly with logging, the unified logging curve also has different value ranges in the same area, which also makes it difficult to compare and stratify the same curve. Therefore, how to solve the interference of volcanic rock composition, so that The logging curve values ​​are unified within the same range and can be compared, which has become the focus of the research on volcanic stratification. At present, various curve combinations are often used in the field to determine the marker intervals, but the results are quite different and artificial.

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