As it is well known, limestone is a type of sedimentary rock that has a function as a reservoir of oil and gas. One of the factors that affect fluid saturation of the reservoir is the distribution of porosity inside the limestone that represents a percentage of the total available space for the oil and gas to fill in. Since hydrogen and carbon have strong attenuation to the thermal neutron, the oil-filled in the porosity can be investigated by the neutron tomography technique. Therefore, neutron tomography can be used to visualize the distribution of the porosity of the limestone. In this work, we report the characterization of the porosity inside the limestone obtained from the oil and petroleum gas institution of Indonesia using the neutron tomography technique. Characterization of the porosity using X-ray tomography technique also has been done in order to compare the results. The results show the neutron tomography technique is useful to visualize and characterize the porosity inside the limestone.

Duplex stainless steel (DSS) is widely used in chemical processes, petrochemical, oil & gas industries, and nuclear technology due to its excellent mechanical properties and exceptional generalized and localized corrosion resistance. In this study, the crystal structure, material phases, and texture characterization of DSS were carried out using the neutron diffraction method. The characterization results show that the duplex has two phases: α (ferrite) and  (austenite), each with a lattice parameter 2.8736 Angstrom and 3.6076 Angstrom, respectively. The sample symmetrization method from triclinic to orthorhombic are used to analyze pole figures. The crystallite orientation in the α and  phases have the opposite direction. The α phase has a crystallite orientation towards {110} <001> or Goss orientation, and the  phase, crystal orientation towards {100} <001> or the cube orientation. The orientation distribution function shows that the orientation strength of ferrite is much stronger than austenite. The crystallite orientation (texture) obtained by the orientation distribution function analysis follows the crystal structure analysis.

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