| BaiBao oilfield is is one of the focus of development blocks in Changqing Oilfield, located between Wu Qi in Shanxi and Huan Chi in Gansu, covered by an area of BaiBao in Wu Qi and QiaoHe in Huan Chi.Began to explore in the 70s of last century, putted into production in the 90's, explored and evaluated for YanChang formation mainly since 2002.Have received an important breakthrough In the Chang3,Chang 4+5,Chang 6,Chang 8 and Chang 9 formation. This paper based on geological, logging, experiment, production and other dates, through the researching of logging curve element, reservoir comprehensive characteristic, production data, using curve method for sedimentary faces automatic recognition and cluster analysis to determine reservoir type identification method, capacity coefficient method, effective thickness and oil saturation method of productivity prediction, final evaluation productivity gets the following conclusion:(1) According to the geological data, the study area Chang 8 reservoir is divided into Chang 81 and Chang 82, growth delta-front sedimentary second faces, the Sediment source direction for NE, main reservoir located in Chang 81 layer for underwater distributary channel sedimentary microfaces zone;(2) Study area Chang 8 reservoir's rock types is Clastic feldspar sandstone, low content of interstitial material, sandstone Sorting characteristics is better, degree of rounding is mostly successively edges shape, smaller pore throat, good sorting, The maximum pore throat way connectivity's Concentration degree is higher, using cluster method to determine the reservoir, divided it into four kinds, Classâ… andâ…¡reservoir is the better reservoir;(3) By comprehensive utilization of oil testing and production information, collecting a variety of geological parameters which were related to production, made the relevant analysis with the oil testing and production information. Found that main controlling factors of the reservoir production capacity is the effective thickness and oil saturation, and then use production capacity parameters, the effective thickness and oil saturation method to predict the production, and achieved good results;(4) Pointed out 5 potential areas, including 1 best potential areas,3 better potential areas and 1 good potential, totaling prediction area 37.8 km2, predict reserves 1640.9 tons. Suggest deployment 5 evaluation Wells. Provide geologic foundation for scrolling development in BaiBao oilfield in 2011. |
