Method for improving recovery ratio of braided well pattern of hugely thick or multi-layer oil and gas reservoir

The invention discloses a method for improving the recovery ratio of a braided well pattern of a hugely thick or multi-layer oil and gas reservoir. The recovery ratio of the hugely thick or multi-layer oil and gas reservoir is improved by designing the braided well pattern. The braided well pattern is designed through the following method: dividing a cubic development unit of the oil and gas reservoir; measuring physical property parameters of the cubic development unit; calculating well pattern design parameters according to the physical property parameters, wherein the well pattern design parameters comprise well number and well body track; and drilling a large-displacement horizontal well according to the well pattern design parameters. The step of dividing the cubic development unit ofthe oil and gas reservoir specifically comprises: obtaining the boundary of the oil and gas reservoir through seismic volume data; obtaining a main development layer system of the oil and gas reservoir according to a geologi