Characterization and Controlling Factors of Sandstone Reservoirs inBasalt Development Areas: An Example from Comparison betweenBZ34-9 and KL6 Areas in South of Bohai Sea
Wang Wei
Yang Xianghua
Ye Jiaren
Wang Qingbin
Zhu Hongtao
Li Huan
Abstract：BZ34-9 area and KL6 area are located in the north and south of Laibei low uplift, respectively in south of Bohai Sea.The characteristics of the sandstone reservoirs in the two areas are of great differences in spite of the similar background of Cenozoic basalt development which has been proven by drilling.The contrastive studies on structural background, temporal-spacial distribution of basalt, sedimentary system and reservoir development have been taken combined with the analytical methods of 3-D seismic data, well log, casting thin section observation, SEM, BSE and X-ray diffraction.For the BZ34-9 area, braided river deltas were deposited on a gentle slope at low depositional rates.Syndepositional basalt flows occur in the upper and lower parts of the sand body and high-quality sandstone reservoirs are characterized by dolomite coats, zeolite cementation and dissolution, and mixed-layer clay coats, which collectively had a positive impact on the reservoir quality.By contrast, the KL6 area was situated on a steep slope and fan delta deposition occurred at a high rate.The Neogene basalt focused on the middle of the basin and had limited influence on the sandstone reservoirs which is characterized by abundant kaolinite and carbonate cementation.The Oligocene strata of KL6 area which situated near Tan-Lu fault zone has been greatly influenced by the Neogene basalt activities during the diagenesis stages.The magma and hydrothermal activity caused recrystallization of siderite, sericitization and prevailing precipitation of ferrodolomite.The basalt influence on the sandstone reservoirs are controlled by the time of eruption, source supply and the configuration of sandbody and basalt.
Keywords：basaltsandstone reservoirreservoir characteristicsBZ34-9 areaKL6 areastratigraphypetroleum geology
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：17( 570-586 )