| The XQ45 block of Xinzhuang oil field includes the fault block of XQ45 and XQ75,lying in the northeastern part of the oil field.It lies in the sag part of Biyang,the northern slopes and eastern Xinzhuang various fault areas,belongs to the oil reservoir of contacting discordantly and shielding by faultage,well-develops small faults and the construction is in break.The bed of interest is the number of II oil layer dispersed over Member 3 of the Hetaoyuan Formation,and the distribution of the oil layers is mainly controlled by the faultages.microtectonics and sand body.In development,the infusion steam flees seriously,the exploitation effectiveness gradually change badly after taking in and sending out of high cycle times and the edge water affects exploitation seriously in low situs,all of the above restrict the development of the field in greater degree,so that it demands to realize the geologic reservoir description again.The thesis combines the well logging date collected and the predecessors'result of the dividing sublayer,and selects the well X4303?X4609 and XQ60 to be the type well,chooses the top of the H3II oil layer and the sublayer of H3II4 to be the key bed,then builts up 9 well-tie sections covered whole well field and uses mainly the curve of GR?RT and AC assisting with the micro-normal curve to subdivide and compare the 4 formations of interest,includes the sublayer of II2?II3?II5?II6,of all 88 wells in whole oil field.The result indicates that the sublayer thickness of each intended interval alter rarely from north-east division to south-west division according the section plane,except handful wells drilled the fault by chance,and the layer connects well in fault-block;On the base of the ex-research of the explanation about earthquake and geologal recognize of the reaserch region,this essay draws superface structural map which has a 5m interval,and considers that this area is a composit trap shielding by faultage and exposure level,the small fault grows badly insides the two fault block,and the structure features is approximately a monoclonal slope raising from the southwest to the northeast;According to the direction of provenance,the sand thikness changes thin gradually,its connectedness becomes well and the amount of sand is excessive but the thickness is thin in vertical in whole field;The analysis of drill core and log facies indicates that the sublayers of 112 and 113 is in the depositional environment of braided chenier plain,which grows mainly the microfacies of braided channel and meta bay,and the sublayers of 115 and 116 is in the sedimentary context of braided delta front subfacies,which develops mainly the microfacies of subsea channe?mouth bar and sand sheet,then the research region sedimentary facies model is also constructed;The analysis result of core date displays that the reservoir is mainly macro-pore throat and moderate sorting,the pore type are mainly intergranular pores and dissolved pores,which belong to the moderate pore and higher permeability reservoir.Based on the rock core physical properties and log interpretation,this paper interpret all 88 wells' physical property variable of whole field,and draw the plane distribution chart of physical property variable for each individual layer;The convergence piot,BP neural network and multiple stepwise discrimination method are exerted synthetically to establish the diagnosis model of oil-water bed;Synthesizing the analysis of each parameter above to do a comprehensive reservoir evaluation,the thesis optimized the choice of the range of profitability and the favor individual sand bed.In general,the H3II oil layer of the study area has well physical properties and large oil-bearing area,most of which distribute near the fault,and the range of profitability concentrate mainly in the high position which is sealed by faults.And the studied four sublayer are all beneficial reservoirs,in which the best individual layers are II23?II31?II32?II61?II5. |
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