A METHOD FOR EVALUATING THE PRODUCTION POTENTIAL OF RESERVOIRS IN THE SHILONGCHANG-BAIYA OILFIELD IN NORTHERN SICHUAN AND ITS APPLICATION

The Silongchang-Baiya oilfield,located in the northern Sichuan basin,is an oilfield that was put into production earliest by Southwest Subsidiary Company of SINOPEC.Geological conditions of the oilfield are so complicated that exploration and exploitation are very risky.Up to now,31 wells have been drilled and 185 zones with hydrocarbon shows have been recorded.However,the techniques and equipment for stimulating hydrocarbon zones were previously backward as compared with those nowadays;therefore some of the hydrocarbon show zones did not have good performances.On account of the above-mentioned problems,the authors have gathered almost all the data of the hydrocarbon show zones encountered by drill holes and conducted a comprehensive study to establish the correlation between different levels of shows and potential productive capacities of the reservoirs.The paper presents a new term,“potential factor”(“PF” for short),to describe the production potential of reservoirs quantitatively.Case study shows that the method of evaluating the production potential presented by this paper can indicate the potential productive capacity of the evaluated reservoirs.The Dayi section in well SL11 is a hydrocarbon zone with the greatest potential in the field found by evaluation.Its potential factor is 0.86.Two different measures for stimulating its production were taken in September 1998 and December 2001 respectively.Both measures have successfully enhanced productivity remarkably and good benefits have been gained.