The Study Of Enrichment Regularity For Reservoirs Of Saertu Oil Layer In The West Slope

Using the data of oil and gas drilling and oil and gas shows, a systematic study including sequence stratigraphy, seismic sedimentology, structural evolution features, fine dissection of reservoir architecture and oil&gas distribution rule of West Slope in Songliao basin is carried out in this research, in which the controlling factors of hydrocarbon accumulation and the distribution rule of hydrocarbon enrichment zone are deeply analyzed, the next exploration work focus is determined also. To carry out the 4 nose-like structure belt and 1 stratigraphic pinchout belt, points out the nose-like structure belt and stratigraphic pinchout belt are favorable for hydrocarbon enrichment zone, divides the five oil and gas accumulation zone, and different reservoir accumulation zone controlled the distribution of different types of reservoirs. Finely isochronal formation frame is established, sedimentary facies map of subdivision of Saertu reservoir is worked out, distribution rule of sandbody and packing characteristics of sediment from Saertu reservoir in different periods is defined, also the sedimentary evolution rule is concluded. The main oil layer is S23 in Fulaerji and Jiangqiao area of the west slope, The main oil layer are S0 and S1 in Alaxin and Taikang area of the west slope, The main oil layer are S0 and S1 and the local oil layer is S23 in Pingyang area of the west slope. Point out that the hydrocarbon accumulation characteristics and enrichment extent of hydrocarbon accumulation zone in West Slope is obviously controlled by both of structural and sedimentary sandbody type, where microscope structural reservoir, litho-structural reservoir, structural and lithologic reservoir, as well multi-lithology composite system including sandstone updip pitchout and sand lens lithology etc are developed. In combination with various factors including structure, fracture, sediment and hydrocarbon migration, pool-forming pattern in the study area is established; the analysis of main influence factors of reservoir shows that nose structural zone, fracture zone and stratigraphy pitchout are the favorable area for hydrocarbon accumulation. 5 and 4 favorable hydrocarbon enrichment zones are separately divided in S23 and S1, which points out the favorable area for hydrocarbon accumulation, proposing the idea of exploration deployment in three levels.