The Sedimentary Characteristics And Development Plan Of Grape Flower Oil Layer In Gulong Oilfield

The development of the Putaohua oil reservoir in Gulong Oilfield encountered many problems,such as the unclear understanding of reservoir spatial distribution due to the unstable reservoir development and the small scale of sand bodies,and the unclear distribution of oil and water due to the complicated relationship between oil and water.Due to the thin thickness of the reservoir,poor physical properties,and the heavy calcium content of mud,leading to low prediction accuracy of seismic reservoirs.In this paper,through the latest structural interpretation results of the Putaohua oil layer in each block,log data and seismic prediction data were used to comprehensively analyze and study the structural characteristics of the Putaohua oil layer,the distribution pattern of the facies belt,and the development characteristics of the reservoir,etc.,to clarify the research area.The distribution pattern of oil and gas accumulation provides the basis for the further exploration of the remaining oil in the oil layer.Based on the latest structural interpretation results of Putaohua oil layer in each block and the data of control wells and development wells,the fine structure features of the top layer of Putaohua oil layer were studied.It was clear that the top surface structure of Putaohua oil layer in Gulong Oilfield presented “one break,one saddle,two concaves,three long lines”.Based on well logging data and seismic prediction data,a calculation formula for the stratigraphic framework and river engineering was established to clarify the sedimentary pattern in the study area.The Putaohua oil layer is the delta frontal facies,and developed underwater distributary channels and seats.The sedimentary microfacies of the sand deposits are studied.Based on the characteristics of tectonic sediments,reservoir characteristics are studied.A multi-parameter oil and water identification map is established,the oil and gas accumulation law in the study area is defined,and 11 oil and gas favorable enrichment zones are selected.Finally,Based on the optimized results of favorable areas for oil and gas enrichment,the development plan design and economic effect evaluation are carried out.The target block is expected to produce 9.6×104 tons of oil,production rate 11.67%,internal rate of return 12.40%,have Mining value.The study deepened the geological understanding of the Putaohua reservoir in the Gulong Oilfield,optimized the hydrocarbon enrichment zone,reduced the development risk,and laid afoundation for the large-scale investment and development of the oil field.