Study On Reservoir Characteristic Of S1Middle Reservoir In Jin16Block

Fine reservoir description generally refers to the oilfield which enter into high water cut stage and high water cut stage,tapping the potential and enhanced oil recovery and distribution characteristics、regular pattern、control factors of the remaining oil of reservoir goals multidisciplinary comprehensive study.In the development of late oil field of fine reservoir description,with sophistication,the basic unit of forecast strong,and dynamic binding,and computerized high degree of characteristics.Fine reservoir description is a pillar technology which can effectively improve the level of oil field development and effectiveness.Not only can it play a great role in the reservoir evaluation,provide the basis for hunting subtle reservoir、optimazing evalution of well location,but provide quantitative reservoir geological modeling for numberical simulation of reservoir,distribution of residual oil and optimizing the exploitation of the program.In the Western Depression of Liaohe Basin of Bohai Bay Basin is a Cenozoic rift basin,experienced a rift of Paleogene and depression of Neogene with two big stage of evolution.Thick Cenozoic strata deposited in the depression, developmental strata included Fangshenpao group、Shahejie group、Dongying group、Guantao group、 Minghuazhen group and Fourth Department of strata, the deposition thickness of nearly8000m, mainly of continental clastic,including volcanic rocks and small amount of carbonate rocks.East off West super-style single off dustpan structural characteristics of the Western Depression, overall,the basic pattern of what zoning on the plane.Due to these tectonic setting of the control of conditions,result the western depression of its development process,have strong tectonic activity,mainly in rift fault block.In its developmental stages,the faults are well developed.The development of intended interval of Jin16of Huanxiling Oilfield is the Yulou formation of one of Lower Tertiary Shahejie group.Structure located in the southern section of the sunken west slopes of the western region of Liaohe rift.The structural form is an anticlinal structure,which griped the South and North two normal faults,the axial was a long strip of the NE-SW direction,the length from east to west have7km,the wide from north to south have1-2km,the reservoir construction area of Yulou formation was5.35Km2.The Strata low in the east, high in the West,North steep south slow, dip4-11°.The main oil of pay the Department of Shahejie group of Lower Tertiary of Jin16is a typical fan delta depositional system,reservoir sedimentary type is fan delta front subfacies of underwater distributary channel sand bodies, the lithologic character mainly as fine sandstone、mud and gravel-ranging grain sandstone,had thickness sand interbedded stratum and lithology changes. Followed by a shunt between a small number of divided flow Bay of sand bodies,the lithology is a thin layer of fine-grained sandstone and silt fine sandstone.Mutual cutting of the sand body in the longitudinal, the thickness of single sand body was thin,mudstone distribution was laminated,the characteristics of stratigraphic section showed the sand bags and mud,contiguous spread superimposed on the plane. Sandstone reservoir rock types of the study area is dominated by lithic arkose and feldspathic lithic sandstone,followed by a small amount of feldspathic sandstone, mixed sandstone and bioclastic sandstone;the main pore types was intergranular pores,followed by dissolution pores、intergranular holes and cracks,the main type of particle is pores-pore-contact cement,the main of interstitial material is muddy, followed by carbonate;attributed high porosity and permeability reservoirs. The reservoir distribution of the study area is mainly affected by the structure、lithology,which is structural reservoir;and the types of traps is mainly as the structural and lithology,supplemented by a complex traps.The characteristics of nature of its crude oil with big density、big viscosity、and high gum and asphalt, belonging to the ordinary-especially heavy oil.Study the reservior,the main access to some of the following research results:First. According to the characteristics of correlation marker and sedimentary cycle of Jin16, on the basis of sedimentary cycle and principle of compared signs with division the marker bed, descending gradually Control,the Yulou layer is divided into two reservoir groups (Yu I Oil Formation and Yu Ⅱ Oil Formation),6sand group,Yu I Oil Formation which consists of11small layer.Second. we have known the structural characteristics of Yulou layer.Jin16had confirmed10faults of varying sizes.The East of dropping faults had6, and remain as the South fault.NE-trending fault as the trunk fault, had big fault displacement and activity a long time. Overall,the North East of the main faults played an imporment role of the control of sedimentary structure formation and aggregation of the oil、gas and water law;the fault of EW play an role of complex secondary structure and the formation of oil and gas of reservoir trapsThird.In the study of Plane distribution characteristics of sedimentary facies of the study area,the Yulou layer of Jin16belongs to the fan-delta depositional system,which contained fan delta plain and fan delta front and the the front fan delta.And the sediments from northwest.Most developed fan delta.Major development of underwater distributary channel microfacies,interdistributary Bay microfacies, mouth bar.Fourth.Through four sexual relations,integrated geological、logging and other information to establish a sand body interpretation of the model to determine the oil-water layer recognition standard, the application of oil field development drilling of each period and static data and logging data, the flooding characteristics and discrimination method.According to the above methods and evaluation criteria,secondary processing and interpretation of176well.Modified the conclusion of the interpretation of some wells, mainly as the evaluation of the flooded layer.Compared to Log interpretation of the past, most of the reservoir turned into flooded layer (strong layer flooding,flooded layer,weak flooded layer).The other type of log interpretation results had no change.Fifth.Small layer description for the unit to conduct a detailed description of the reservoir distribution.Vertically, the reservoir have an overall understanding of all angles.The study area of the main oil-bearing strata is Yulou layer of I oil group, which mainly distributed in the top of each layer. In the distribution of the plane layer,closely related to the distribution of sedimentary facies.Bearing area from northeast to southwest to contraction,inextricably linked with the construction and reservoir type.In summary,we can have some important results about the conformation feature, sediment festure and reservoir feature, we have known the reservoir situation of Yulou layer.And researched the water distribution characteristics,completed the second logging explanation;on the basis of oil testing、test mining,to create a new interpretation model or criteria,interpretated the reservoir and the reservoir,the water layer, the dry layer,oil-water layer,and different levels of flooding in a layer of Yulou layer of Jin16,offer the reservoir and reservoir parameters;study the different sand body bmacro-distribution characteristics, and study the reservoir properties;analysis of fluid on the plane and the vertical distribution and controlling factors of hydrocarbon accumulation,In addition,according to the results of detailed reservoir description,to determine the reserve calculation parameters,on the vertical,sandstone group and layer as a unit,on the plane,the reservoir fault block unit for calculation of reserves. This will not only deepen the reservoir geological knowledge and have great significance to maintain the stability of the regional production of Jin16.