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Method for identifying attitude of stratum and inversion method of stratum parameters

A technology of formation and formation interface, applied in the field of geophysical exploration of oil and gas resources, can solve the problems of difficult fine evaluation of mud invasion characteristics, inability to obtain formation resistivity information, etc., and achieve the effect of high accuracy

Active Publication Date: 2017-09-29
CHINA NAT OFFSHORE OIL CORP +1
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Problems solved by technology

[0004] However, neither the electrical imaging logging nor the dual laterolog can obtain the formation resistivity information in the area between the detection depth of 2 and 20 cm, so it is difficult to make a fine evaluation of the mud invasion characteristics in this area

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  • Method for identifying attitude of stratum and inversion method of stratum parameters
  • Method for identifying attitude of stratum and inversion method of stratum parameters
  • Method for identifying attitude of stratum and inversion method of stratum parameters

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Embodiment Construction

[0052] In order to make the objectives, technical solutions and advantages of the present invention clearer, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that, the embodiments in the present application and the features in the embodiments may be arbitrarily combined with each other if there is no conflict.

[0053] refer to figure 1 , a method for identifying formation occurrence according to an embodiment of the present invention includes the following steps:

[0054] Step 101: Acquire a synthetic logging curve on each electrode plate of the electro-imaging instrument;

[0055] It should be noted that, since the electro-imaging instrument has multiple electrode plates, and each electrode plate has multiple button electrodes, it is necessary to synthesize the data of the multiple button electrodes on each electrode plate.

[0056] Further, the step 101 specifically includes:

[005...

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Abstract

The invention discloses a method for identifying attitude of a stratum and an inversion method of stratum parameters. The methods include the steps of obtaining Well-logging curves on each counter electrode of an electrical imaging device; conducting pre-hierarchy on each composite log to obtain a pre-hierarchy interface location of each Well-logging curve; successively choosing depth segments containing pre-hierarchy interfaces as reference segments, conducting a correlation contrast on the Well-logging curves on other counter electrodes to obtain an effective layer interface of each Well-logging curve; ranking the effective layer interfaces of the Well-logging curves on all counter electrodes by depth, obtaining a stratum interface and calculating attitude information. Further more, based on the stratum hierarchy, a forward model is formed by combining the information of dual laterolog; by inversion, mud invasion depth and specific resistance of invaded zones and undisturbed zones are obtained. The stratum interface extracted by the methods matches with logging images pretty well, the attitude information is more precision, and the stratum parameters obtained by inversion can achieve quantitative description of invasion features of mud.

Description

technical field [0001] The invention relates to the technical field of geophysical exploration of oil and gas resources, in particular to a method for identifying formation occurrence and an inversion method for formation parameters. Background technique [0002] In order to effectively detect oil and gas layers, in the process of oil and gas field exploration and development, digital processing of logging data has become one of the main tasks of logging interpreters. The calculation of formation occurrence in existing commercial software is based on the correlation of fixed window lengths. Compared with the method, the advantage of this method is that the calculation speed is fast, but the disadvantage is that the layer interface cannot be identified. The general trend of layer interfaces in the long range, but cannot reflect the precise dip angle and inclination of each layer interface, and cannot be applied to fine deposition analysis. For this reason, the usual practice...

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Application Information

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IPC IPC(8): E21B49/00
CPCE21B49/00
Inventor 刘耀伟杨玉卿于增辉崔维平柳杰武磊
Owner CHINA NAT OFFSHORE OIL CORP
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