Reservoir Characterization Method of Carbonate Paleokarst Residual Hill Based on Well-seismic Fusion
The carbonate paleokarst residual hills developed at the top of the Qianmiqiao Or-dovician buried hill of the Beidagang structural belt,as an important ancient landform and oil and gas reservoir unit,have good conditions for reservoir formation.Effective characteriza-tion of paleokarst residual hill reservoirs is of great significance for the analysis of oil and gas migration,accumulation,and exploration and development of residual hill reservoirs.In this paper,the application of seismic impression method can effectively depict the ancient land-forms of weathering crust karst of Qianmiqiao Ordovician buried hill,with 5 karst residual hills and 4 karst valleys developed throughout the area,characterized by mountains on the mountain.Well seismic fusion analysis suggests that most of the buried hill weathering crust reservoirs are distributed within the range of 0～200 m below the surface of the weathering crust.The residual thickness of the weathering crust in each block of the main buried hill va-ries greatly,and the residual thickness of the structural high points above the karst residual hills is large.Karst caves developed within the weathering crust of residual hills are identi-fied through abnormal display on imaging logging and conventional logging curves,mainly consisting of two types:large karst caves and small and medium-sized karst caves.Applying frequency enhanced seismic bodies for forward modeling,clarifying the seismic reflection characteristics of advantageous fractured and vuggy reservoirs,and combining tensor direc-tional field fracture quantitative prediction technology can accurately predict carbonate frac-tured and vuggy complex reservoirs,and guide the evaluation and development of oil and gas potential target of residual weathering crust reservoirs.
paleokarst residual hillswell-seismic fusionancient landform restorationten-sor direction fieldkarst reservoirs
NETL
NSTL
万方数据
维普
