Paleogeomorphic restoring technology for karst based on multi-parameter inversion and its application to Daniudi gasfield,Ordos Basin
The top Ordovician,Daniudi gasfield,northeastern Ordos Basin,possesses poor seismic resolution which is in-fluenced by coal seams of the Taiyuan Formation,resulting that paleogeomorphic restoration is not accurate only dependent on its seismic interpretation.So,in the light of drilling,well logging and seismic data,integrated with regional,depositional and structural setting,the key geological interface was explored precisely for this field from two technologies,such as post-stack interpretation and multi-parameter inversion.Several karst predominance areas were pointed out through karst resto-ration.Finally,the effect on the extension of karst reservoirs was analyzed.Results show that(ⅰ)for this sort of reservoirs,the paleogeomorphic restoration based on multi-parameter inversion should be kept the predicted error of residual thickness no higher than 4 m;and(ⅱ)based on percolation of paleogeomorphic units,combined one relation of gas layer thickness to residual weathering-crust thickness with productivity-well distribution,the evaluated zonal paleogeomorphology suggests one area with the residual thickness less than 58 m comparatively favorable for karst extension.In conclusion,the pa-leogeomorphic restoring technology based on multi-parameter inversion may effectively improve the interpretation for the in-terface to further raise the restoring precision,which is conducive to clarifying the distribution of karst reservoirs and offer-ing assistance for the next exploitation.
Ordos BasinDaniudi gasfieldMulti-parameter inversionPaleogeomorphic restorationKarst predominance area
NETL
NSTL
万方数据
