Method for using fracture density curve to forecast fracture density body

Abstract

Disclosed is a method for using a fracture density curve to forecast a fracture density body. The method for using the fracture density curve to forecast the fracture density body includes following steps: (1) preparing geology, well logging and earthquake data, performing normalization processing, inversion and attribute data body optimization on the related data, and obtaining the fracture density curve and an optimized data body of all wells after being normalized; (2) building various fracture density calculation models, bringing data on the fracture density curve of all the well after being normalized and curve data of the optimized data body into calculation, and selecting the fracture density calculation model most approximate to an actual fracture density situation according to calculation results; (3) bringing the optimized data body into the selected fracture density calculation model for calculating so as to obtain fracture density bodies after being normalized, and then obtaining the fracture density body of a time domain through reverse normalization processing. The method for using the fracture density curve to forecast the fracture density body can complete detailed description for the fracture density data body of the time domain, and then reduces well drilling risk, and improves shale gas exploration benefit.

Description

technical field [0001] The invention belongs to the field of petroleum and natural gas exploration, and in particular relates to a method for predicting a fracture density body by using a fracture density curve. Background technique [0002] Fractures are an important channel for underground oil and gas accumulation and migration. Fracture prediction refers to predicting the development intensity of fractures or parameters related to fracture analysis. In most cases, the fractures are mainly structural fractures—fractures attributed to or associated with local tectonic events, including fracture systems related to faults, fracture systems related to uplifting, and fractures related to folds system and so on. The high-quality shale reservoirs of the Longmaxi Formation in the southern Sichuan Basin are basically developed with micro-fractures, and these types of fractures play the role of communicating with the shale reservoirs. Therefore, finding fractured high-quality shal...

AI Technical Summary

Problems solved by technology

[0004] (1) Conventional fracture prediction technology is difficult to effectively describe the changes of micro-fractures in the vertical and lateral directions, and the accuracy is often unsatisfactory;

[0005] (2) The prediction results of micro-fractures by conventional fracture prediction technology often do not match well with the measured results in the well, and the prediction accuracy is relatively low

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