Reservoir Evaluation And Potential Area Prediction Of H60 Block In QA Oil Field

Because H60 block production appear different degree of decline,a direct impact on the oil field production stable.In addition,the distribution law of the small sand body in the QA oil field is not detailed and the distribution law of remaining oil is not clear,In order to delay the decline rate of the oil well and improve the recovery rate of oil reservoirs,it is necessary to conduct a comprehensive review of the old well of the block,re-evaluate the reservoir,and find the potential layer to improve the development benefit of the reservoir.In view of the above problems,this thesis mainly through stratigraphic correlation,tectonic characteristics,sedimentary facies study,combining with the logging second interpretation,a comprehensive evaluation of reservoir in this area seepage coefficient method is applied to each small layer to injection-production splitting component,calculating the remaining oil reserves in the study area has reached to predict potential area,mainly in the following:(1)The stratigraphic cycle of the qn1 is strong,it can be divided into 16 small layers;Qn2 is mainly composed of thick layers of mudstone,and between mudstone and sandy layer,the sand layer is divided into 24 small layers;The thick sand layer in the qn3 formation was developed,and the erosion of the sand body was frequent,the boundary was difficult to identify,which can be divided into 7 small layers.(2)The formation is stable in the research area,the continuity of each reflection interface is better and easy to track.The fault is development and it has a strong point in the plane.(3)The sedimentary environment in the study area is the front end environment of the delta leading edge with the semi-deep lake,which is accompanied by a certain wave tidal transformation,the river function,and the rapid accumulation phenomenon of the collapse phenomenon;The main sand body is formed by the fast accumulation of distributary channel and the leading edge sand dam combination;The sedimentary facies model is "distributary channel + frontal sand dam + sheet sand + sliding sand + lake facies mudstone".(4)Reservoir in the study area is divided into four categories,namely the low permeable formation(?type),special low permeability layer(? type),ultra-low permeable zone(? type),dense layer(? type).Subject of mouth bar,lateral margin often develop ?type reservoir;The leading edge of the sand dam,the estuary of the estuarine bar,and the overflow area of the channel are dominated by the ? type reservoirs.Offshore bar and transportation is given priority to with ? type reservoir;Sand sheet and the Poor physical properties zone of channel overflow main development ? type reservoir.Reservoir classification results show that the closer from the provenance,Reservoir property is relatively good.The main reservoir is the type reservoir.? Sedimentary frontal region,relatively poor reservoir physical property,the main development ?,? type reservoir.(5)By using the method of seepage coefficient to carry out the injection and mining of each small layer,the calculation results show that the main layers of the main layers are generally low,and less than 20%,3,7,9,12,14,21,23,36,37,38 have abundant remaining reserves,which is the potential for the next step potential.