Favorable Area Prediction On Putaohua Reservoir Of Ying 88 South Block In Songliao Basin

This paper takes the Ying88 south area of the Gulong area in the central depression of the north part of the Songliao Basin as the research object.The area of the work area is 160.324km ².The target oil formation is the P₁₁,P₁₂,P₁₃ sand group in P_I reservoir group of Putaohua oil formation of Yao 1 section in the lower Cretaceous.For problems such as inaccurate structural interpretation,inaccurate prediction of sand bodies,and lack of favorable areas.Geophysics,geology,and test data are used.On the basis of structural interpretation,the distribution laws,trapping ranges,and types of sand bodies are mainly studied.The control factor is the preferred principle.The favorable area is graded and the favorable oil-bearing area is preferred.Using three-dimensional visualization,coherent data volumes,and horizontal thin-section,the structure of the study area was fully interpreted in three-dimensions.The T_1-1 reflection stratum develop two major fault zones.The major faults are dominated by the northwest-southeast direction and are formed in the near-east-tropic tensile stress field.The local structure is dominated by faulted anticlines and fault blocks.The tectonic evolution stage of the target strata is mainly in the depression period,and the depositional periods are mainly deltaic.By constraining lean pulse seismic inversion and geostatistical inversion methods,predictions were made on the Putaohua oil sand body group.The sand body prediction coincidence rate is about 80%.It is predicted that the sand body thickness of P_I3 sand group is greater than 5 meters,and the thickness of P_I2 sand layer group is greater than 6 meters and the thickness of P_I1 sand layer group is greater than 4 meters in the concentrated distribution area.Based on the structural interpretation and sand body prediction,Using seismic attribute analysis result.The study area is mainly composed of lithologic traps.There are 31 lithospheric traps of sandstone lenses,and 9 structural-lithologic traps.The characteristics of oil and gas reservoirs and the controlling factors of oil and gas distribution indicate that the reservoir is mainly controlled by the distribution of sand bodies and is related to the structure and oil source faults to some extent.The analysis results of oil and gas reservoir characteristics and control factors of oil and gas distribution indicate that the reservoir is mainly controlled by the distribution of sand bodies and oil source faults.Combined with the Daqing oilfield zone evaluation criteria,the P_I oil layer group P₁₁,P₁₂,and P₁₃ sand layers are evaluated for favorable area classification.The favorable areas of each sand group were overlapped,the final favorable deployment zone of the P_I reservoir group was determined,and three proposed well locations were proposed.