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In this paper I present a detailed QCD analysis of twist-3 effects in theWandzura-Wilczek (WW) approximation in deeply virtual Compton scattering (DVCS)observables for various kinematical settings, representing the HERA, HERMES,CLAS and the planned EIC (electron-ion-collider) experiments. I find that thetwist-3 effects in the WW approximation are almost always negligible atcollider energies but can be large for low Q^2 and smaller x_bj in observablesfor the lower energy, fixed target experiments directly sensitive to the realpart of DVCS amplitudes like the charge asymmetry (CA). Conclusions are thendrawn about the reliability of extracting twist-2 generalized partondistributions (GPDs) from experimental data and a first, phenomenological,parameterization of the LO and NLO twist-2 GPD $H$, describing all thecurrently available DVCS data within the experimental errors is given.Comment: 18 pages, 21 figures, uses Revtex4, final version to be published in  PRD, minor revisions due to referee suggestion

Detailed QCD analysis of twist-3 effects in deeply virtual Compton scattering observables