Research Of Geological Characteristics Of Chang2in Quan54-Quan74Wells Area Of Xia Siwan Oil Field

Xia Siwan oil field is located in south-central of Eerduos Basin and is battleground of exploration and development in recent years.Its tectonic units the Yishan slope.Quan54～Quan74area of the researcher is located in south to Xia Siwan oilfield area and the major reservoir is the Chang-2oil laye of Yanchang Formation.The oil area is240km2and thickness is33m.The yield of the area change a lot,the relations between the oil and water is complicated and the geological understanding is not clear.On the basic of previous research, we take fine strata classification and correlation theory as instruction divided and compared to strata in entire area and make a deep division to Chang2formation and get three oil bearing series.The article is theoretically based on reservoir geology,reservoir sedimentology,reservoir well logging geology,exploration geology etc and analyses all kinds of the sedimentary characteristic comprehensively.Using core,well logging, we judge Chang2formation is the delta front intrafacies and grows mainly five sedimentary microfacies of undersea distributary channel, mouth bar, distal bar, levee,distributary interchannel.Based on source direction and sedimentary facies,using Petrel the article did the research of sandbodies distribution characteristic. Reservoir stratum property,four character and reservoir type are also analysed. On the basis of the systematic description and evaluation of various properties, enriched rules of the area are conclued and the data range of profitability is anticipated. These provide a new basis for the area of oil and gas exploration for the next step.