Reservoir Description Of Putaohua Reservoir In Zhao 35 Area, Daqing Oil Field, China

This thesis studies the Putaohua Reservoir in Block Zhao 35, Daqing Oil Field as the objectives. Zhao 35 lies in south of the Daqing Song Fangtun oilfied with117km~2, in which the Putaohua oil layer is main oil layer, the thickness is about 50m. After developments for many years, now its problems contain: (1) the target layer of this area has high content of water, the oil-water relationship is complicated; (2) the sand in the target layer is decentralized; (3) many thin sandstone-shales are interbedded. The following results are achieved.(1) Seismic interpretation was made by using Landmark software, 48 faults have been identified and 20 big faults occurred. The shape and distribution range of the faults was studied as well. It is believed that they played an effective role in oil and gas accumulation. Two structural maps of Putaohua reservoir were done, 21 traps found.(2) Oil-water relationship such as fluid properties, vertical oil-water relationship and plane distribution were done. P12, P141,P142, P17 and P18 were good oil layers. It is believed that the distribution of oil-water relationship is controlled by structure (especially fault) and sand body distribution.(3) Using many available wells as constraints, constrained sparse spike inversion had been done. Inversion sections show that both upper and lower of the Putaohua layer contain good sand bodies. We compared the relationship of P-impedance and lithology data, predicted that most of sand bodies lie in northwest and south.(4) By using the results from seismic interpretation and inversion, geology and lithology models of Putaohua reservoir were built up. Lithology model fits well with distribution of sand bodies.(5) Using the results from seismic interpretation, oil-water relationship, inversion, reservoir modeling, 4 levels of reservoirs were divided, which can give some advices for the development of oilfield.