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A Method for Evaluating the Effectiveness of Igneous Reservoirs Using Acoustic Amplitude Quantitative Processing

A technology of effectiveness and range, applied in the field of evaluation of the effectiveness of igneous rock reservoirs, can solve the problems of difficult validity, multiple uncertainties, complexity, and evaluation of electrical imaging data, so as to reduce the cost of exploration and development and achieve good application effects , the effect of improving accuracy

Active Publication Date: 2021-06-29
CHINA NAT OFFSHORE OIL CORP +1
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Problems solved by technology

But at the same time, because geological bodies such as stratigraphic bedding and layer boundaries have the same characteristics as fractures in electrical imaging data, there is a high degree of multi-solutions in identifying fractures using electrical imaging data.
When the fractures are filled with dark minerals such as mud and pyrite, it is difficult to evaluate the effectiveness of the electric imaging data; although the array acoustic wave data can evaluate the effectiveness of the fractures and holes through the wave amplitude attenuation, due to the Due to different well conditions, etc., often only single well analysis can be performed, and multi-well data cannot be used for simultaneous comparison and application, which brings difficulties to the study of inter-well reservoir effectiveness evaluation.
[0004] At present, in view of the above-mentioned interpretation and evaluation requirements, the effectiveness evaluation method of igneous rock reservoirs has many uncertainties and complexities, and inter-well comparison cannot be realized, so it is necessary to study the method of evaluating the effectiveness of igneous rock reservoirs by quantitative processing of acoustic wave amplitude

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  • A Method for Evaluating the Effectiveness of Igneous Reservoirs Using Acoustic Amplitude Quantitative Processing
  • A Method for Evaluating the Effectiveness of Igneous Reservoirs Using Acoustic Amplitude Quantitative Processing
  • A Method for Evaluating the Effectiveness of Igneous Reservoirs Using Acoustic Amplitude Quantitative Processing

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example 1

[0049] Example 1: Figure 3a It is the result map of the acoustic wave amplitude processing of the igneous rock section of a well in the BZ block of the Bohai Sea, Figure 3b It is the result graph obtained by processing the well data by the method of the present invention. The lithology of the section shown in the well is mainly granite. According to electrical imaging, there are holes and fractures in this section, but it is difficult to identify the effective reservoir location based on conventional data. The amplitude processing results show that the effective reservoir intervals of this well are mainly concentrated at 3932-3980m ( Figure 3a In the solid line box), the shear wave amplitude and Stoneley wave amplitude in this section are significantly reduced, indicating that the reservoir effectiveness in this section is relatively good. The amplitude ratio of this section is processed and projected onto the reservoir effectiveness evaluation chart. The projection resul...

example 2

[0050] Example 2: Figure 4a It is the result map of the acoustic wave amplitude processing of the igneous rock section of a well in the PL block of the Bohai Sea. Figure 4b It is the result graph obtained by processing the well data by the method of the present invention. The lithology of the section shown in the well is mainly granite, and electrical imaging data show that the reservoir space of the well is dominated by fractures, with no pores and vugs. Because the space occupied by fractures is small, it is difficult to identify effective reservoir positions based on conventional data. As a result of the amplitude processing, two sections attenuated significantly at 1500-1515m and 1520-1540m, and conventional data showed that the wellbore diameter expansion in the 1500-1515m section was serious ( Figure 4a In the solid line box), the reduction of the acoustic wave amplitude is proportional to the degree of borehole diameter expansion, so it is inferred that the reductio...

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Abstract

A method for evaluating the effectiveness of igneous rock reservoirs by quantitatively processing acoustic wave amplitude: performing array acoustic logging in the depth interval; using the root mean square method to calculate the amplitude of the array acoustic logging data; obtaining the same lithology conditions of the same well Next, the ratio of calculated amplitudes of the effective reservoir section to the non-effective reservoir section; use the effective thickness indicated by the ratio of Stoneley wave and shear wave amplitude to calculate the amplitude productivity index; use the ratio of Stoneley wave amplitude and shear wave amplitude to establish Reservoir effectiveness evaluation chart based on the amplitude ratio; according to the amplitude productivity index, Stoneley wave and shear wave amplitude ratio, the reservoir effectiveness is divided into three intervals, namely type I reservoir area, type II reservoir area and type III Reservoir area: After processing the single well acoustic logging data, quickly predict the reservoir effectiveness and productivity according to the area where the processing results are located in the chart. The invention can solve the problem of evaluating the effectiveness of igneous rock reservoirs, has good application effect and high applicability, and can significantly reduce the cost of exploration and development.

Description

technical field [0001] The invention relates to a method for evaluating the effectiveness of igneous rock reservoirs. In particular, it relates to a method for evaluating the effectiveness of igneous rock reservoirs by quantitative processing of array acoustic wave amplitude. Background technique [0002] With the advancement of exploration technology, igneous rock reservoirs, as an important component of subtle reservoirs in continental faulted basins, have become an important field for deepening exploration and increasing reserves in eastern basins of my country in recent years. Many blocks in the Bohai Bay Basin have obtained good oil and gas shows in igneous rock formations, indicating that the igneous rock reservoirs in the Bohai Bay Basin have great potential. [0003] At present, the effectiveness evaluation of igneous rock reservoirs mainly relies on electrical imaging and array acoustic wave data. When fractures and holes develop in the formation, due to the influ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N29/48G01N29/04
CPCG01N29/04G01N29/48G01N2291/02441G01N2291/0245
Inventor 张国强谭忠健郝仲田张璋李东李欣任宏岳明亮伍鹏祁晓刘如明涂春赵
Owner CHINA NAT OFFSHORE OIL CORP
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