Reservoir Description Of Ci16 Block Ciyutuo Oilfield In Liaohe Depression

Reservoir description is a key geological evaluation technology for oil and gas field exploration and development.It runs through all stages of oil and gas field development,and the research stage is gradually reduced.The description of fine reservoirs is the basis for the development of old wells in the middle and late stages of oilfield development,the distribution of remaining oil,the adjustment of development methods and the optimization of well location deployment.The Ciyutuo Oilfield is located in the Ci's tectonic belt of the eastern depression of the Liaohe fault depression.The Block 16 is located in the middle part of the northern part of the Cretaceous tectonic belt in the eastern depression of the Liaohe Basin.It is a fault block reservoir clamped by the fault zone and the fault east,including Four blocks of 16,611,613,46-70.The block was put into development in 1996.At present,in the middle and late stages of development,the proportion of low-yield and low-efficiency wells is increased,and the water content is high.In this block,it is urgent to carry out the research on the next development mode and put forward the opinions on well position deployment based on the research of the remaining oil distribution in the whole area.The structure of the fault is an asymmetrical anticline structure with two wings.The north is high and the south is low,the west is high and the east is low,and the main body of the structure is mainly distributed along the northeast.The block is a faultbreaking anticline structure caused by a series of geological movements such as faults during the dynamic change of paleo-topography and paleo-sedimentary environment,and it shows that the exercise intensity of the step-by-step fault continues to be complicated.The block includes more than 10 faults,and the regional tectonic pattern is dominated by the Zhadong fault and the C16 fault.The Cidong fault is the most important oil source fault in this area,which plays a major role in controlling the communication and migration of deep oil and gas.Some northwest-oriented and neareast-west derived faults in the work area cut the fracture anticline to form a number of small fault blocks,which controlled the formation of local traps and also affected the distribution of oil and gas water.The physical properties of the block reservoir are in a medium state,but have significant heterogeneity,and the oil-bearing well section is long,and the oil-water relationship is complicated.This paper starts with subdivided target units and fine stratigraphic comparisons,and uses the logging,logging,seismic and core data to carry out three-dimensional seismic fine structural interpretation.Combined with the curvature,variance and coherence of the earthquake,the main target layer structure is implemented.The development of the fault system;the study of sedimentary facies and sedimentary microfacies,the implementation of favorable sedimentary facies belts;the study of the four-sex relationship of the main target strata,the post-series post-seismic inversion,and the implementation of the main oil-bearing sand bodies And the characteristics of horizontal distribution;research on the characteristics of fine reservoirs,clarifying the distribution of oil and water in the main target layer.