Research On The Movability Of Shale Oil In Dongying Sag And The Optimization Method Of Favorable Zone

Shale oil mobility is the hotspot of the current unconventional shale oil and gas research.In this paper,shale oil mobility is defined as"All the geological factors and effects are favorable for the exploitation of flowing fluids in the shale series,which is a combination of the dense shale series and the fluid properties in the series".This definition is clear enough to solve the problem of fuzzy and overlapping concepts of mobility,admissibility and mobility.In this paper,the control factors of mobility are discussed.It is considered that adsorption is the basic criterion for evaluating whether shale oil has mobility,Oil and gas in the shale formation are mobile only when the S1/TOC is greater than the adsorption critical value.The adsorption critical values of two sets of shale are determined,in which the lower part of sand three is 90mg/gTOC,and the upper four of sand is 100mg/gTOC.In addition,The mobility of the fluid,the amount of brittle minerals,the extent of fracture growth,the energy and pressure of the formation also have some control over the mobility.This paper simplifies the lithofacies classification scheme,the favorable facies organic rich laminated argillaceous limestone,organic rich laminated calcareous mudstone,shale and shale as layered calcium movable oil,combined with the mobility control factors summed up the mobility mechanism of oil shale:page rock storage layer containing oil volume is greater than adsorption critical value,sand three Xia Asia paragraph S₁/TOC>90?mg/gTOC?,upper shasi Member paragraph S₁/TOC>100?mg/gTOC?;brittle mineral content is greater than 40%,Coefficient of fracture is greater than 0.2,pressure coefficients in the 1.2¹.8 formation overpressure zone and transition zone;shale oil-free and oil-water miscible,mostly,the viscosity is lower than 10mPa?s.Movable oil evaluation programme was established,with"rock facies identification layer set,evaluation of oil and gas abundance zone,movable elements superimposed as a target"as a general principle,establishment of criteria of shale,rock facies classification standard logging,oil and gas abundance indicators and criteria of oil targets.Restoration logging model,with perfect focus correction calculation methods and techniques and resources.Two typical,Dongying SAG and movable oil evaluation.Results showed moving sand three 3 of the lower layer with laminated covers an area of 897.4km2 in oil,and is divided into 3Movable oil targets;the upper shasi Member movable oil 2 layer laminated covers an area of782.4km2,the same can be divided into 3 Movable oil targets using moveable resources in material balance method for estimation of the target area,and provide the basis for exploration and development.