Petroleum System of Evans Shoal Gas Field, northern Bonaparte Basin, Australia
نویسنده
چکیده
Evans Shoal Gas Field comprises the wells Evans Shoal-1and Evans Shoal-2 .Our study aimed to determine the hydrocarbon potential of the main source rock in the study area and analyze the petroleum systems and guide future hydrocarbon exploration and development. The methods used encompass BasinMod techniques using mathematical methods. Analysis of the source rock potential helped to identify the Plover-Plover (!) system. The main source rock and reservoir rock are located in the Plover Formation. The source rock of Plover Formation is currently mature and characterized by OM Type II and Type III. The average TOC of the Plover Formation in well Evans Shoal-1 is 1.78 wt%, whereas in well Evans Shoal-2 it is 1.84 wt%. The reservoir composed predominantly of fine-grained sandstone deposited with marine and estuarine environments. The measured porosity and permeability are reduced with depth and the upper part of the reservoir section is better than lower one. Cleia and Echuca Shoals formations encompass the main Seal. The overburden includes Cleia, Echuca Shoals, Darwin, Jamieson, Wangarlu, Vee, Lynedoch, Turnestone, Hibernia, Oliver, Barracouta and Alaria formations. The traps were developed from Middle Jurassic to Middle Cretaceous, are almost anticline structural traps. The threshold for hydrocarbon generation and expulsion of the Plover Formation occurred during Late cretaceous and reached the peak at Early Paleocene. The intensities of gas generation and expulsion of the Plover Formation source rock are greater than that of oil generation and expulsion. The PloverPlover (!) System comprises a complete geological elements and processes.
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