Abstract：The exploration and development of deepwater oilfield faces challenges such as insufficient experience, complex deep-water environment and underground factor, higher single-well investment cost, and difficult cost recovery, so that simply using the exploration-development integration mode for onshore and shallow water fields is difficult to meet the requirement of deep-water oilfield. The concept of geology-engineering integration is proposed, incorporating subsurface uncertainties, time and cost elements, which forms a reservoir evaluation and decision-making system, and based on which the evaluation mode, decision-making method and supporting drilling and completion technology have been researched and developed for deepwater oilfields. Evaluation practice in the deepwater pre-salt reservoirs in Brazil shows that the divisional evaluation mode called "one body and two axes" and information-value-oriented decision-making method would be favorable to promote the process of integrated exploration and development, shorten the evaluation period, maximize the evaluation benefit and make scientific decisions for deepwater oilfield. The application of pre-salt drilling and completion technology has greatly improved the drilling efficiency and reduced the drilling cost while accumulating experience for development wells. The successful application of the geology-engineering integration has proved it effective in deepwater oilfield and reservoir evaluation.
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