A New Method for Determining the Layer Mark of Volcanic Rocks

A technology for layering signs and determining methods, which is applied in the fields of geological exploration and volcanic rock geological exploration and development. It can solve problems such as large difference in effects, strong artificiality, and difficulty in comparing layers with the same curve, and achieves fast layering speed and professional requirements. Low, the effect of reducing research costs

CN105319604BActive Publication Date: 2017-12-12PETROCHINA CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2017-12-12

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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.
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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...

Examples

Embodiment

[0024] Example. An example of a new method for determining stratification marks of volcanic rocks in an oilfield in China

[0025] Selecting volcanic rocks in a certain oil field in China carries out delamination mark determination according to the method of the present invention, as figure 1 As shown, the specific process includes:

[0026] 1) Perform GR logging on the target volcanic rock section to obtain the GR curve of the target section;

[0027] 2) Determine the environmental characteristics of specific layers through core observation, and find out the main controlling factors of the logging curve, such as the GR value of the mudstone section is high, the pyroclastic rock section is low, and lava-like volcanic rock reservoirs are continuously low. Jumping as a feature, etc., so as to exclude the abnormally high and abnormally low values ​​in the GR curve obtained in step 1), the processed GR curve is as follows figure 2 shown in the left column;

[0028] 3) Find out...