Assessment on distribution of the Cambrian evaporites affected by structural deformation in eastern Sichuan Basin
Liang Han1, Ma Bo1, Xiao Bo-Yi2, He Qing-Lin1
1 Exploration and Development Research Institute of Southwest Oil & Gas Field Company,PetroChina, Chengdu 610041,China; 2 Exploration Division of Southwest Oil & Gas Field Company, PetroChina, Chengdu 610041, China
Abstract：The widely spread Cambrian Lagoon salt in eastern Sichuan Basin makes the tectonic belts of Lower Paleozoic-Sinian system become a great potential of oil and gas exploration. However, due to the complicated high-steep structural deformation and the limited drilling information, the characteristics of structural deformation is not clear, making it difficult to predict the distribution of structural trapping and favorable reservoirs. Based on the comprehensive analysis on seismogeology to obtain the seismic response characteristics of salt structures and evaporites, the structural deformation and distribution of Cambrian evaporites in eastern Sichuan Basin have been investigated in this paper. As the most essential detachment, the Cambrian salt layer caused the development of thin-layered structure in eastern Sichuan, can be regarded as the isolated fold. The isolated structural mode is positively correlated with the salt structural deformation of Cambrian salt layer, which is the dominated structural characteristics in this area, establishing the structural deformation mode of this area. Based on the rock mechanics of salt layer which is controlled by faults, together with the seismic reflection characteristics, the distribution of the Cambrian salt has been predicted, presenting that it is bounded by the Huayingshan belt to the west, and extends to the Daba Mountain Front along the Shuikouchang tectonic belt to the north, and extends to southwestern direction along the southern Sichuan low steep tectonic belt to the south. The Cambrian depositional center is located along the northeast to southwest direction of the Fangdou mountain.
Liang Han,Ma Bo,Xiao Bo-Yi et al. Assessment on distribution of the Cambrian evaporites affected by structural deformation in eastern Sichuan Basin[J]. JOPC, 2019, 21(5): 825-834.
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