Source Kitchen Research And Correlation Reservoir With Source Kitchen In Anan Sag

Lacustrine basin in eastern China have been refined exploration and unconventional oil and gas exploration at present stage.General hydrocarbon source research early cannot match with need of exploration,thus,need to be furtherance.A series of main source rock in early cretaceous lower First section Tengger formation(K1bt1x).lies in Erlian basin,A'nan sag.The source rock is proved that most of discovered tectonic accumulatin and litholgic reservoir supply by.And,the compact mudstone is favorable tight oil play in the sag.The play is the target of exploration next.Which dolomite,shales and sedimentary-tuff interbeded,compose the “Complex Special Lithologic Section”,it is regarded as both hydrocarbon source rocks and tight oil reservoir of unconventional exploration,exhibits significant heterogeneity.The K1bt1 x source rock buried depth about 1000~1900m,organic matter maturity ranges Ro0.5~1.0%.Source kitchen area is about 160 km2,source rock of hydrocarbon expulsion thickness is 60 m.The organicfacies C thicknesss(with TOC >2%,HIo 450-700mg/gTOC)range 70 m in the central of sag to 10 m in the uplift zone.It is major source rock that vertical distribute in K1bt1 x and predominate in central of sag and bottom of slope.The organicfacies D/E thicknesss(with TOC 1~2%,HIo 250-450mg/gTOC)in no difference in the central and external uplift of sag.Organicfacies D/E vertical distribution decrease form K1bt1 x to upper or lower section.It is secondary source rock that predominate in internal of sag and slope,which thicker in eastern than western.The organicfacies C source matured over the hydrocarbon generation threshold,and expulsed numbers of hydrocarbon.The other poor source isn't expulsed numbers of hydrocarbon.Maturity of source kitchen range from immature in the margin to mature stage in the deep area of the sag.Oil expulsed low mature in the remote and mature in the central of the sag.All discovered oil fields were located out of source kitchen,API of the discovered oil range 20 to 35,oil maturity between immature and mature.Oil property and maturity improve towards source kitchen.Oil source correlations indicate that oil were predominately generated from brackish algae source rock,correspond with organofacies C source analysis.Recently exploration with canal indicate light oil that source kitchen late expulsed have favorable accumulate condition.Four units of migration and accumulation were divided based on the 3D seismic data and petroleum system analysis.Considered with hydrocarbon expel/expulse analysis and discovery,mount of oil maybe discovered in the south migration units.The conclusion pointed out the goals for the next new play exploration.