Research On Reservoir Architecture Of Gravity Flow Channel With High Sinuosity Of Second Member Of Yinggehai Formation,Dongfang Gas Field

Dongfang gas field is located in the northern part of the central muddy rift in the Yinggehai Basin.Its main characteristics are large area,medium productivity,low reserveab-undance,relatively low well pattern density,and strong heterogeneity between reservoi-rs.Since it was put into production,it has now entered a stage of diminishing produ-ction,and it is urgent to make adjustments to tap the potential to slow down the dec-line in production.In this study,multi-dimensional data such as seismic,logging,drill-ing,core,dynamics,etc.were used to carry out research on reservoir architecture of high-curvature gravity flow channels and prediction of favorable target areas.This paper follows the principle of “from point to line,from line to surface” to estab-lish six stratigraphic frameworks in the Dongfang Gas Field.The Y2 IIU strata are used as the target strata to carry out sedimentary facies research,and a total of wave-co-ntrolling sand bars and sandy clastics are identified.There are four sedimentary facies of flow,high-curvature gravity flow channel and muddy channel.On the basis of se-dimentary facies research,the use of seismic facies fine description technology,seism-ic attribute optimization technology and coherent body along-layer slicing technology is used to finely describe the spread of high-curvature gravity flow channels,and devel-op the reservoir configuration of high-curvature gravity flow channels.Research and es-tablish a scheme for dividing the architectural elements of high-curvature gravity flow channels with 3~5 levels of reservoirs.Among them,the five-level configuration elem-ent types are high-curvature gravity flow channels,the fourth-level configuration elem-ent types are end-stage water channels and point dams,and the third-level configurati-on element types are lateral accumulation and lateral accumulation.Quantify the width and thickness of the high-curved gravity flow channel in the study area,the length,width,arch height of the point dam,the width and thickness of the side product and the maximum horizontal span,and establish the corresponding model to find the width of the high-curved gravity flow channel There is a linear relationship with the thick-ness,and the overall scale of the point dam is linear with the various parameters of the point dam.Through corresponding calculations,the distribution range of the inclination angle of the side product is 4°~16°,and the maximum thickness distribution range is5.18m~22.68 m.The contact styles between the side products in the study area include transverse slicing,transverse contact,and transverse separation.Among them,the top of the transverse slicing side products is strongly connected,and the top of the transverse contacting side products is weakly connected.The laterally separated lateral bodies are not connected.At the same time,dynamic data is used to verify that the laterally stacked lateral bodies produce the largest amount of gas.Therefore,the study area is divided into Type I,Type II,and Type II according to the contact patterns between the lateral bodies.Class III favorable target areas,of which Class I favorable target areas have the largest gas-bearing potential.