Quantitative architectural characteristics of deep-lake turbidites: Taking block 146 of Shinan Oilfield in Dongying Depression in China as an example

Abstract

Abstract Taking He146 Development Unit of Shinan Oilfield in Dongying Depression as an example, the quantitative architectural model of turbidite reservoir is studied by using local dense well pattern and production performance data. The turbidites in the study area are mainly turbidite fans and turbidite channels. The area of a single turbidite-fan belt is 0.08–0.8 km2, with long-axis length of 162–900 m, width of 120–620 m, and thickness of 2–25 m. The scale of turbidite-fan belt is positively correlated with its thickness. The morphological parameters of turbidite-channel belts could be counted in logging and seismic data. The width of turbidite-channel belt is positively correlated with its thickness. Its thickness is 2.4–9.6 m, with an average of 6.3 m. The width of turbidite-channel belts is about 612–1212 m (estimated from seismic and logging profiles), with an average of about 884 m. The thickness of a single channel story is 1.5–5.8 m, the inclination angle of the bottom of the channel story is 0.9–2.4°, width of a channel stories is 120–450 m. The variation of channel-story thickness between two wells is fitted to a better linear function with the distance between wells in the cross section of channel stories. High production wells and corresponding injection wells are basically parallel or intersected with low angle to the extension direction of channel. The ideal projection distance is within 150 m, and the projection distance can exceed 150 m in the superimposed area of main body of turbidite-channel.