Multi-boundary curtain type geosteering method based on ant colony-gradient series algorithm

The invention discloses a multi-boundary curtain type geosteering method based on an ant colony-gradient series algorithm, and relates to the technical field of oil exploration and development. According to the method, an inversion objective function and an inversion parameter vector matrix are constructed, the ant colony is randomly placed in the inversion parameter vector matrix, and after instrument response and an inversion objective function value thereof are obtained according to path forward modeling of the ant colony, whether the total path number of the ant colony reaches a preset maximum iteration number is judged; if not, updating the pheromone concentration and the transition probability of each node, if so, taking the parameter vector corresponding to the path with the maximum pheromone concentration as an initial model to carry out gradient inversion, synthesizing while-drilling azimuth electromagnetic wave logging data, calculating an objective function value, and judging whether the objective