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The debate over choice of Accounting methods in the oil and gas sector in the face of alternatives between Full Cost and Successful Effort method dates back to the mid 2oth century and is unlikely to abate soon. Full cost method capitalizes all costs while Successful Efforts method capitalizes only cost that discovers reserves and expenses 'dry hole' costs. The debate is further fueled by the inability of regulators to choose one method over the other leaving the decision to the whims and caprices of the firm who may choose one method over the other to mask their real intentions. This paper examines the pros and cons of the two methods. Investors must be weary and realize that any of the methods adopted represents a historical perspective that is not reflective of the economic reality especially reserves under successful Effort method. Investors must note that using Full cost method approximates the book values of the reserves close to the economic value while at the same time it suffers from the disadvantage that it can be used to mask unprofitable investments. In summary, the raging arguments reveal the possibility of manipulation of earnings by oil firms depending on intentions through choice of accounting method. In Nigeria, Multinational firms tend to adopt accounting method in line with the method chosen by the parent company to ensure uniformity and ease of comparison of results while indigenous firms adopt the methods that best suit their operations

Hydrocarbon reservoirs management appropriate methods exploiting oil and gas reservoirs are of the most important strategies in oil industry in line with national authority, state development and flourishing in economy and other fields. Someone's name it as reservoir management and some others name it as production management; also some specialists consider it as outer, inter, circumferential, humanistic, technologic, politic, economic and environmental factors. Raw oil and gas reservoirs management is the approach to overcome the economic and international challenges and remove the political and economic concerns; that is why nowadays oil-rich industrial countries have programs to develop oil and gas fields. Such management process is to develop the fields and maintain them properly. These different views and definitions indicate different structures in the process management; in line with this article is to describe the important role played by integrate management in oil and gas reservoirs and the process scenario.