Application Research Of Well Logging Data In Chang 6 Reservoir Of Baibao Area

After large-scale production and construction development of chang6 reservoir in Baibao region,the discovered high-quality reserves have been basically utilized.At the present stage,it is faced with difficulties of subsequent stable production and weak upper production resources.In order to optimize the new production capacity construction block,the chang6reservoir in baibao region is studied in depth to determine the next development direction.On the basis of absorbing and digesting previous research results,the exploration and development of chang6 reservoir in Baibao area are confronted with such problems as complicated regional geological conditions and difficulty in subsequent construction and production.Based on well logging data,core and other geological data,the chang 6 formation is divided into three sub-strata,namely chang 61,chang 62 and chang 63,by means of stratigraphic fine division and correlation method.Combined with the analysis of regional sedimentary background,the facies markers were identified by using logging data,and the sedimentary microfacies of chang 63 small layer were identified as delta front deposition and gravity flow deposition of semi-deep lake collapse,and the sedimentary microfacies profile and plane plan were drawn.In the study area,the delta front deposition was developed in the north east of the area,and the semi-deep lake gravity flow collapse deposition was developed in the south west of the area.Under the combined action of the delta front deposition and the semi-deep lake gravity flow collapse deposition,the sand body in the study area was abnormally developed along the nw-se direction,with a large thickness and a wide distribution range.Combined with the geological law of the study area,the reservoir parameters are evaluated by using abundant logging data and core analysis data,and the study area is divided into 6 geological units.The four relations of reservoir are studied and the interpretation model of reservoir physical property parameters is established.The lower limit of porosity and permeability is determined to be 7.0%and 0.07md respectively.Oil and water layer identification model is established for each geological unit to accurately identify oil and water layer.In the northern geological unit,oil and water layer resistivity is lower and acoustic time difference is higher;in the eastern geological unit,oil and water layer resistivity is higher and acoustic time difference is lower.The reservoir thickness is large,the distribution range is wide,the reservoir is superimposed vertically,the oil area of the whole region reaches 350km~2,the average reservoir thickness is 16.0m.The reservoir geological parameters affecting large productivity were optimized,and the productivity prediction model was established based on the production dynamic data of the study area.Three favorable areas for edge expansion were selected in chang6 reservoir in Baibao area.