Mud Logging Interpretation Method for Reservoir Identification Using Triangular Chart and Probability Chart

Abstract

The invention discloses a mud logging interpretation method for reservoir identification by using triangular charts and probability charts. Calculate the change index based on the measured gas value, drilling time, conductivity and temperature; c. Calculate the water cut index W, oil content index O and gas content index G through the change index; d. Establish water cut index W, oil content index O and gas content index The relative ratio of the index G is a triangular chart with three sides; e, use the established triangular chart to conduct preliminary identification of the fluid-containing properties of the reservoir; f, establish a probability map based on the triangular chart, and use the probability map to identify the fluid-containing properties of the reservoir final identification. The invention combines the curve method, the chart method, the automatic identification technology and the fluid integrated identification technology, and has high integration, less manual intervention and is easy to realize.

Description

technical field [0001] The invention relates to a mud logging interpretation method based on drilling fluid logging parameters using integrated triangular charts and probability charts to identify the fluid properties of reservoirs, and belongs to the application of logging while drilling data processing technology in the field of mechanical and electrical field, petroleum and natural gas industry exploration and development field. Background technique [0002] At present, there are more in-depth researches at home and abroad on the mud logging interpretation method of formation reservoirs encountered during drilling and their fluid-bearing properties, which are described as follows: [0003] Domestically, Sinopec tends to develop and practice new equipment, and conducts research and application of new oil and gas reservoir identification and discovery equipment such as rock pyrolysis, thermal evaporation of hydrocarbons, tank top gas and nuclear magnetic resonance. Compreh...

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Problems solved by technology

[0007] 1. The existing oil well logging interpretation technology scheme lacks the curve method technology. The northern oilfield service company has long used the chart method, such as the gas survey chart method, the light hydrocarbon chromatogram chart method, etc. to analyze, and the northern oilfield owners such as Changqing Oilfield are not aware of this Very satisfied, due to the characteristics of logging data while drilling, many interference factors, and difficult to correct, it is difficult to give full play to the role of original mud logging data with a method similar to the chart method, which relies on data with strong unity and stable system errors;

[0008] 2. Most of the curve methods are now promoted, and qualitative identification is carried out through trend value analysis. Some progress has been made in Sichuan-Chongqing, Changqing and Tarim, but its strong adaptability and high efficiency have also brought weak pertinence and block optimization Poor problem, therefore, some corrections and adjustments are required

[0009] 3. The common problem of the existing chart method and curve method is that it is difficult to carry out computer application. The chart method needs to frequently adjust the separation interval, and the curve method needs manual qualitative judgment, which restricts the further development of automatic improvement of mud logging interpretation

[0010] 4. Existing technologies pay more attention to the interpretation of gas wells or oil wells, and there are few technologies for integrated identification of oil, gas and water dry layers

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