The Identification Of Reservoirs Fractures And Evaluation Of Optimized Well Pattern About Xifeng Oilfield

Xifeng oil field exploration started from1974, Poull well drilled oil-water layer of7.1m, after fracturing the daily oil production is2.95t and daily water production is1.52m3After this the drilled exploratory well had low oil production test and has’t been fully explored because of Chang6-8formation poor physical property and reservoir rebuildAs the continuing improvement of Jurassic exploration, Triassic reservoir has been focused again by the oil field company as the important resource base of Longdong district development. In2000, Changqing oil filed company conducted the third exploration of Xifeng oilfield, followed by the macroscopic oil exploration theory、"three rediscover" guiding ideology and "three steps" strategic objective. The new break is continuing in exploration researches by geologists’expanding thoughts, the cognition of Chang6-8sedimentary system become distinct clear and specific. The reservoir cognition of the drilled Xil7well in2001realized the first qualitative leap In30years. Chang8formation has high commercial production rate with nature flow of62.5t/d oil, after3months production test, oil production stabled at62.5t/d, which becomes the significant mark of Xifeng oil field successful exploration and started the prologue of large-scale Xifeng oilfield exploration.Xifeng oil filed contains six blocks like Baimazhong、Baimanan、Dongzhi etc, which has inverted nine-spot rhombus pattern, has fractured water breakthrough and out of main direction oil well in the development, has low well group recovery, has bad or no effective response of lateral oil well, and then the development effect has been influenced. This article take Longdong as the research target especially for the Xifeng oil filed, based on the fine geologic study, studies the fracture development feature, builds the equivalent fracture model, researches the different fracture distribution feature’s influence on the development by numerical simulation technology, realizes the high oil field development adjustment and enhance oil recovery.