The dual-detector density logging response relation has been widely used,but some factors have been neglected.

This article provides the principles and methods, of well pattern optimization, lists examples to calculate well spacing, on the basis of Shanxi Block, gives optimization design to guide CBM development.

To improve conventional sand body model which utilized insufficiently data,had lower precision and required farther checking,a new method integrating various data based on different well spacing was proposed.

Determination of rational injection-production well spacing is significant for economic and effective exploitation of low permeability oilfield or reservoir due to existence of starting pressure gradient and recovery difficulty.