Understanding pore characteristics through core-based petrographic and petrophysical analysis in a heterogeneous carbonate reservoir:A case study from the Mumbai Offshore Basin,India  

作　　者：Ilius Mondal Kumar Hemant Singh 

机构地区：[1]Department of Earth Science,Indian Institute of Technology,Bombay,India

出　　处：《Petroleum Research》2023年第4期469-480,共12页石油研究（英文）

摘　　要：Carbonate rocks exhibit complex and heterogeneous pore structures;such heterogeneity is manifested by the occurrence of a wide variety of pore types with different sizes and geometries as a result of depositional and diagenetic processes.These complications substantially increase the uncertainty of predicted rock hydraulic parameters because samples with comparable porosities might have very different permeability values.In this study,small-scale characterisation of porosity and permeability in heterogeneous Eocene limestone samples from the Bassein Formation of the B-X structure of the MK Field in Mumbai Offshore Basin,India,was carried out,employing an integrated framework that in-corporates thin-section petrography,routine core analysis,mercury injection capillary pressure and nuclear magnetic resonance data.The pore characteristics of these carbonates range from poor to excellent.The studied samples exhibited large ranges of porosity,permeability and other associated petrophysical attributes.The pore types,as well as their orientations and connectivity,are the primary factors causing the heterogeneity.Because of the complexity of the pore networks,a simple lithofacies classification alone would have been insufficient to link porosity and permeability.The reservoir char-acteristics in the study area are strongly linked to the development and/or destruction of reservoir porosity-permeability during different phases of diagenesis.Twenty-four carbonate core samples from the limestone unit were studied and classified into microfacies and pore type classes,producing an accurate assessment of reservoir attributes.The comprehensive workflow incorporates the pore volume distributions and pore throat attributes for each rock type.Three carbonate microfacies were identified by petrographic analysis and their petrophysical characteristics,such as porosity,permeability,pore throat size,pore volume and fluid flow factors,were measured.The study demonstrates how macro-porosity,mesoporosity and microporosity are associated w

关 键 词：Carbonatereservoir PERMEABILITY Mercury injection capillary pressure Nuclear magnetic resonance Porosity partitioning 

分 类 号：P618.13[天文地球—矿床学]