فهرست مطالب یاسمن احمدی

Jahrom and Asmari Formations in two wells from Nargesi field in the southern part of Dezful Embayment were studied to interpret the sedimentation and diagenesis history of Paleocene-Miocene successions. A total of 14 different microfacies were identified based on the study of 270 m drilling core and 495 microscopic thin sections,which are located in four sets of open marine, shoal, lagoons and tidal flats. The microfacies of the Asmari Formation are include tidal and lagoon sets. The microfacies of the Jahrom Formation are include middle ramp and the open marine, and energetic facies of the shoal sets have been observed in abundance in this formation, and to a lesser extent has lagoon facies. According to the characteristics of the above microsfacies, it is suggested that a shallow carbonate ramp with a gentle slope be used as a sedimentation environment for these Formations in Nargesi field. Asmari Formation is deposited in the shallower parts of this ramp. The paragenetic succession of Jahrom and Asmari Formations has been interpreted based on petrographic evidence in four marine, meteoric, burial and uplifting environments, and have affected sediments, during the three stages of eogenesis, mesogenesis and telogenesis. Dolomitization, cementation, anhydritization, micriticization, neomorphism, compaction, dissolution and fracture are the predominant diagenetic processes in these Formations. Dolomitization and anhydritization processes have been observed throughout the Asmari Formation, but are less intense in the Jahrom Formation. Asmari Formation cements are mostly dolomitic and anhydrite, but Jahrom Formation cements are mostly calcite.

This study presents reservoir rock-types, hydraulic flow units and electrofacies of the upper Dalan and Kangan formations in a well from the South Pars Field. To achieve these goals, drilled core data and thin section petrography are integrated with petrophysical logs and porosity–permeability data. The main target of this study was to elaborate on the relationships between the reservoir rock-types, flow units and electrofacies with depositional sequences and systems tracts. Petrographic analysis of facies characteristics (depositional textures), diagenetic alterations and dominant pore types are integrated to define the petrographic rock-types. Eight hydraulic flow units are recognized using the values of flow zone indicator. Neutron, sonic, density and resistivity logs are clustered to define the electrofacies. Finally, all rock-types, flow units and electrofacies are correlated in a sequence stratigraphic framework. Consequently, grain-dominated facies of shoal setting with dominant interparticle pores as well as dissolution molds and vugs provide the best reservoir units in the K4, and middle parts of K2 and K1 sequences. On the other hand, anhydritic facies of supratidal and mud-dominated facies of intertidal, lagoon and open marine settings along with compacted and cemented grain-supported facies form the non-reservoir intervals in the transgressive systems tracts of K2, K3, early TST and RST of K1 sequences.

In  this  paper a  non-linear  model  with  fractional  order  is  presented  for  analyzing  and  controlling the  spread  of  HIV virus.  Both  the  disease-free  equilibrium and the endemic equilibrium are  found  and  their  stability is  discussed. The basic reproduction number , which is a function of the constant parameters in the model, plays an essential  role in the stability of  the above model. In more precise expression, When  the disease-free  equilibrium is attractor, but when ,  is unstable and the endemic  equilibrium    exists  and  it  is  an  attractor.  Finally  numerical  simulations  are also established  to  investigate  the influence  of  the  parameters in the model  on  the  spread  of  the  disease.