Geological Evaluation Of Movable Reserve In Yushulin Oilfield

This　article　researched　　the　main　character　of　Yushulin　oil-　field,then　analysed　 entironment　of　deposit　and　character　of　reservoir,face　character;then　analysed　character　of　 reservoir　formed,conditions　of　structure　geology.Using　fractal　theory　to　research　reservoir's　forecast,and　combine　with　dynamic　character　of　reservoir　to　evaluate　movable　reserve.Through　research　,and　think　 reservoir　of　Yushulin　oilfield　has　some　character　as　follows.　1,Structure　evolving　history　of　Yushulin　oil　field　includes　three　stages:　faulting　trap　,depression,structural　reverse　.Stress　mechanism　in　structural　reverse　stage　changed　from　tension　stress　to　squeeze　stress,then　stress　field　is　radically　changed.　2 , Used　blockage　coefficient　of　fault　and　shale's　daubing　coefficient　to　evaluate　blockage　of　faulting.In　structural　activity　static　zone　,for　example　,T2　and　T1-1　faulting,if　faulting　space　exceeds　10m,then　it　has　blockage　property;if　fault　space　exceeds　20m,then　it　has　good　blockage　property.　　　3,Based　fractal　theory　and　method,built　numerial　value　calculating　system　about　uneven　distribution　of　 reservoir.　Fractal　theory's　inserting　value　method　is　access　to　real　situation,showed　character　of　uneven　and　nonlinearity　used　fix　quantify　.　　4,After　initial　checking,　Fuyang　reservoir　reserve　in　yushulin　oil　field　is　12117×104t,area　is　247.9km2.Including　employed　area　is　72.5km2,employed　reverse　is　5181×104t;unemployed　area　is　175.4km2,proved　　reverse　is　6936×104t;canceled　area　is　1.5km2, canceled　reverse　is　93×104t.　5,In　Yushulin　oil　field　,Fuyang　reservoir　permeability　is　53.1　percent　of　gross　reverse　if　permeability　exceeds　1×10-3μm2;　46.9　percent　of　gross　reverse　under　1×10-3μm2,included　proportion　of　reverse　that　is　33.9　percent　under　0.5×10-3μm2　　almost　can't　be　employed.　　6,In　employed　zones　of　yushulin　oil　field　,　according　to　effect,　have　three　cases　of　zones.The　first　case　zone　is　mainly　developed　and　economic　benefit　is　good,but　the　third　case　is　radically　no　economic　benefit.　7,Calculated　single　sand　body's　reverse　to　typical　zones,the　count　of　big　areas　is　only　5　percent　of　gross　sand　bodies,but　it's　reverse　exceeds　50　percent　of　gross　reverse;　in　fact,almost　big　proportion　of　reverse　belongs　to　I　and　Ⅱ　case　reverse,and　permeability　is　generally　good;　Ⅲ　case　reverse　that　is　about　the　ratio　of　1　to　3　can't　be　effectively　employed　by　300m　multiplied　by　300m　in　well　net.　　8,According　to　classifing　criterion　about　reverse　,begin　to　evaluate　and　to　optimize,no　area　and　reverse　in　Ⅰ　case　zone;area　is　8.2km2　and　reverse　is　433×104t　in　Ⅱ　case　zone;　area　is　12.4km2　and　reverse　is　594×104t　in　Ⅲ　case　zone.　Area　is　20.6km2　and　reverse　is　1027×104t　in　unemployed　zone.　9,In　employed　zones,we　shoud　develop　tests　about　different　well-net　density　in　order　to　improve　employing　extent　of　reverse,and　develop　economic　evaluating.　10,Developed　some　researchs　about　lower　investment　and　capital,at　the　same　time,continue　to　develop　and　to　improve　technics　about　oil　extraction　in　order　to　ensure　effective　development.