Biological reef reservoir identification method

Abstract

The invention belongs to the technical field of oil exploration and development, and provides a biological reef reservoir identification method, which comprises the following steps of S1, determining a favorable biological reef developmental facies belt by restoring an ancient landform of a region and delimiting a sedimentary facies; s2, collecting logging data and three-dimensional seismic data of a favorable biological reef developmental facies belt; s3, performing horizon calibration and seismic interpretation on the three-dimensional seismic data by using seismic interpretation software; s4, determining development characteristics of the reef facies strata; s5, establishing a biological reef earthquake response feature and a recognition mode; s6, identifying the characteristics of the biological reefs developed on different sedimentary facies belts by combining the rock core, the slices and the logging data; s7, on the basis of biological reef identification, establishing a biological reef reservoir earthquake-logging response feature and identification mode; s8, identifying a biological reef reservoir development mode by utilizing earthquake-logging; and S9, identifying the biological reef reservoirs of the whole region by using seismic data, and finally determining the development range of the biological reef reservoirs. According to the invention, a complex exploration method is simplified.

Description

Technical field [0001] The present invention belongs to the field of petroleum exploration, development technology, specifically relates to a biological reef reservoir identification method. Background [0002] With its good storage performance, the biological reef occupies an important position in the carbonate oil and gas field, and its oil and gas resources have always been a valuable asset attracting the attention of the world. Since the discovery of the first reef-type gas reservoir in the Jiannan Permian in eastern Sichuan in the 1970s, such oil and gas reservoirs have been discovered and put into development, and the research page of biological reef-type oil and gas reservoirs has attracted much attention. [0003] A variety of methods of sculpting biological reef reservoirs have been proposed. For example, the Chinese patent publication number is: CN 104977611A, which discloses a method of sculpting biological reef reservoirs, which includes: reservoir identification step...

AI Technical Summary

Problems solved by technology

However, in the eastern Sichuan Basin, there are various types of reefs in the Changxing Formation of the Permian, and the development layers are also different, with strong heterogeneity, which leads to relying on the existing single well analysis to determine the development layer of the reservoir. In combination with seismic means, Very limited

Not only does it require high seismic quality resolution accuracy, but it is also difficult to identify small-scale reservoirs. Secondly, drilling costs are high. If the existing single-well reef reservoir wells fail to include all reservoir types, it will lead to a large number of reservoirs. Oil and gas resources are not effectively utilized and developed

In addition, the analysis methods and steps are too complicated, and the lack of qualitative description and quantitative research is not conducive to actual on-site operation. Therefore, this technology has relatively large defects in the research of reef reservoirs in Changxing and is not fully applicable.

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