Channel: GEOLOGICAL RESEARCH https://www.ljgczz.com EN-US https://www.ljgczz.com/EN/current.shtml https://www.ljgczz.com 5 3 Formation in Bohai A Oilfield is braided river delta, well drilling shows that sandstone percent content is between 5%-65%, and in several areas, igneous rocks with thickness of 5.4-22.6 m are distributed as layers in the inner reservoir. Ed₃ Formation can be divided into four lithology-sedimentary facies belt which develop layered igneous rocks, underwater distributary channel, distal-bar sand and sheet sand. Accurate well-seismic calibrating shows that different stratigraphic lithologic structure can be distinguished by seismic amplitude attribute. In the paper, seismic forward models with complicated stratigraphic lithologic structure are designed, to establish mathematical relations of amplitude attribute and sandstone content, result shows that RMS amplitude is 1 160-4 808 and has a three-part relationship with sandstone content when stratigraphic is sand-shale interbedding. RMS amplitude is higher than 7 226 when stratigraphic is sand, shale and igneous rocks interbedding. Sandstone content is in reverse proportion to RMS amplitude. The sandstone content of Ed₃ Formation is described quantitatively in different zones with well drilling correction. The result is applied to fine geologic modelling. 20 development wells have been deployed, the average single well sandstone drilling rate is increased by 22.3% and recovery ratio is increased by 1.2% through model prediction.]]>