A Method for Interpreting and Evaluating Horizontal Well Logging Parameters

Abstract

The invention discloses a method for explaining and evaluating logging parameters of a horizontal well. The method comprises steps as follows: a stratum model is built according to a logging curve; the well track of the horizontal well is calculated and shown through drilling parameters, and the logging curve is projected horizontally and vertically on the basis of the drilling parameters; the built stratum model and seismic section data are imported into the horizontal well; drilling stratum interfaces are divided by analyzing logging response features, and whether the logging response features are changed remarkably is analyzed with the drilling stratum interfaces as a restraint; the stratum model is adjusted to be matched with an actual logging curve; response features of electrical resistivity are simulated. A horizontal well explanation and evaluation technique formed on the basis of forward modeling of the double-induction electrical resistivity is adopted, the defect of a traditional single plumb-shaft explanation manner is overcome, the formed two-dimensional explanation method accords with geological features better and can meet urgent requirements of exploration and development for a new horizontal well explanation method, and the purpose of optimizing selection of layers to be fractured is achieved.

Description

technical field [0001] The invention relates to petroleum well logging engineering technology, in particular to a method for explaining and evaluating horizontal well logging parameters. Background technique [0002] At present, in the field of oil drilling technology, the logging interpretation technology for horizontal wells is relatively lagging behind, and the simple interpretation method for vertical wells is still used. Even if some personnel use two-dimensional interpretation, it is only two-dimensional display of horizontal wells, without analysis and evaluation from the logging response mechanism of horizontal wells. However, in fact, the logging response of horizontal wells is different from that of vertical wells, and is affected by many factors, such as wellbore trajectory, reservoir top and bottom boundaries, thin layers inside reservoirs, instrument detection depth, local structures, etc. Hirai's explanation is relatively complicated. In addition, only using ...

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Problems solved by technology

However, in fact, the logging response of horizontal wells is different from that of vertical wells, and is affected by many factors, such as wellbore trajectory, reservoir top and bottom boundaries, thin layers inside reservoirs, instrument detection depth, local structures, etc. Hirai's explanation is relatively complicated

In addition, only using the interpretation method of vertical wells cannot determine the relationship between wellbore trajectory, reservoir location and oil-water distribution, and cannot meet the needs of petroleum engineering.

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