Carbonate rock structure ingredient well logging quantitative recognition method and purpose thereof

A technology of carbonate rock and rock structure number, applied in the field of petroleum geological exploration and logging interpretation

Active Publication Date: 2014-04-02
PETROCHINA CO LTD
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Problems solved by technology

[0009] This method effectively solves the technical bottleneck of rock structure component logging identification, but the Lucia rock structure number formula also has shortcomings: it is based on the fact that the porosity of formation cores ranges from 4% to 40%, w...

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  • Carbonate rock structure ingredient well logging quantitative recognition method and purpose thereof
  • Carbonate rock structure ingredient well logging quantitative recognition method and purpose thereof
  • Carbonate rock structure ingredient well logging quantitative recognition method and purpose thereof

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Embodiment 1

[0107] Taking the formation of the Ordovician Majiagou Formation in the Wuqinan area of ​​the Ordos Basin as an example, the present invention is described in detail by taking the logging identification of rock structure components in the coring well Lian 1 well as an example:

[0108] 1. Basic geological conditions and regional parameters:

[0109] The Ma5 member of the Ordovician Majiagou Formation in the south of Wuqi area is a set of marine carbonate strata, the structure is monocline structure, the lithology is mainly dolomite, a small amount of anhydrite dolomite and argillaceous dolomite. There are three types of rock structure components in this set of strata: micritic structure, powder crystal structure and fine crystal structure. Geological conditions are suitable for the application of the present invention.

[0110] Parameter acquisition: use CLS-5700 logging series instruments to measure formation acoustic time difference DT and formation resistivity R t , to me...

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Abstract

The invention discloses a carbonate rock structure ingredient well logging quantitative recognition method and a purpose thereof. The method mainly comprises three parts including porosity and water saturation well logging calculation, rock structure number parameter calculation and rock structure ingredient identification. When RFN obtained through calculation is smaller than 0.3, the structure is a micrite structure; when the RFN is between 0.3 and 1.1, the structure is a powder crystal structure; when the RFN is greater than 1.1, the structure is a fine crystal or particle structure. The sound wave time difference logging curve is adopted for calculating the porosity, the deep lateral resistivity well logging curve and the porosity are utilized for calculating the stratum water content saturability, a rock structure number formula is utilized for calculating the rock structure number parameter, and different rock structure ingredients are identified through cutoff values. The method provided by the invention is practically applied to the stratum of Majiagou formation of Ordovician system in Wuqinan region of Ordos Basin, and a better effect is obtained.

Description

technical field [0001] The invention relates to petroleum geological exploration and logging interpretation technology, and relates to a logging quantitative identification method of carbonate rock structure components and its application. Background technique [0002] Using well logging data to identify carbonate rock structure components has always been a difficult problem in the world. The identification of rock structure components is further subdivided on the basis of lithology identification, using conventional well logging curves, based on neural networks, cluster analysis and other mathematics The method can no longer achieve satisfactory results. The main technical bottleneck problem is the effective logging parameter extraction technology. Because the carbonate rock formation is strongly affected by karstification and fracture reformation, the lithology information measured by logging is disturbed, resulting in carbonate rock formation. The identification accuracy ...

Claims

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Application Information

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IPC IPC(8): G01V1/28G01V1/40
Inventor 李昌郭庆新沈安江张惠良周进高潘立银倪新锋乔占峰刘占国张荣虎郑剑锋常少英熊冉谢灏辰熊绍云李国军黄羚郭华军
Owner PETROCHINA CO LTD
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