Lithology scanning logging data-based fluid property identification method

Abstract

The invention discloses a lithology scanning logging data-based fluid property identification method. The lithology scanning logging data-based fluid property identification method comprises the following steps that lithology scanning logging data and conventional logging data are acquired, and formation lithology profile parameters are solved by using the lithology scanning logging data and the conventional logging data; a standard neutron capture cross section index is calculated according to the obtained formation lithology profile parameters; the obtained standard neutron capture cross section index in a compact layer section is calibrated by using the neutron capture cross section index in the lithology scanning logging data, the calibrated standard neutron capture cross section indexis obtained; and the fluid property is identified according to the neutron capture cross section index in the lithology scanning logging data and the obtained calibrated standard neutron capture cross section index. The method is not influenced by lithology and reservoir types, and has wide practicability.

Description

Technical field [0001] The invention belongs to the technical field of reservoir fluid property logging evaluation in petroleum exploration and development, and in particular relates to a fluid property identification method based on lithology scanning logging data. Background technique [0002] Reservoir fluid property identification is an important content in logging interpretation and evaluation. It is a key step in the exploration and development of oil and gas fields. It plays a very important role in the geological understanding of the entire oil and gas field and the deployment of exploration and development. [0003] At present, the identification of fluid properties by logging methods is mainly based on the conventional logging series based on electrical logging. According to the absolute value of the measured formation resistivity and the ratio of the resistivity of different exploration depths, the resistivity of a certain area is counted by combining testing and sampling...

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Problems solved by technology

However, the lithological scanning logging data provides the parameter of formation neutron macroscopic capture cross-section index, which can reflect the fluid information in the well. However, the current method of identifying fluid properties through the neutron macroscopic capture cross-section index is mainly used in cased wells. Use by neutron lifetime logging, which has not been used in open hole

[0005] The paper "Application of Lithological Scanning Logging Technology in Complex Sandstone Reservoirs of Bohai Sea" mentioned the use of lithological scanning logging for fluid identification, but because the method mentioned relies on the calculation of fluid saturation through resistivity logging, the Complex reservoir conditions are not applicable

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