This work could be useful for assessment of reservoir distribution and quality, for reduction of uncertainty during field development, as well as for providing useful insight to similar hydrocarbon reservoirs elsewhere.ĭetermination of depositional facies is essential in the oil and gas industry. Finally, the results illustrate how the coupling of GR patterns with the analysis of petrographic characteristics can be used to understand the depositional setting of a hydrocarbon reservoir that lacks core samples. The interpreted results indicate a tidal channel depositional setting for electrofacies-A, mixed tidal flat depositional setting for electrofacies-B, and low relief offshore mudstone depositional setting for electrofacies-C. Three electrofacies were interpreted in the studied section: (1) electrofacies-A (blocky sandstones), which is characterized by a cylindrical-shaped (right boxcar) GR trend (2) electrofacies-B (intercalated sandstones and shales), which is characterized by an irregular log trend with serrated shape and (3) electrofacies-C (shales), which is characterized by irregular GR trend and has no character. The facies analysis indicates that the studied member has a heterogeneous nature and rapid facies change its main lithofacies are blocky sandstones, intercalated sandstones and shales, and shales. Pores reflecting primary and secondary porosity as well as inter-granular pores are dominant. Petrographic analysis indicates that the sandstone reservoir is fine- to medium-grained arkose with dominant siliceous cement and composed mainly of quartz, feldspars, and lithic fragments. Then, gamma-ray (GR) log patterns of the studied reservoir wells were used for interpretation of depositional environment. Consequently, 30 thin section samples representing the reservoir section of four wells were described in detail and standard petrographic characteristics were determined. To overcome the absence of core samples in the middle Miocene Sidri Member in the Badri field, Gulf of Suez, this study aimed to reconstruct its depositional settings by coupling well logging patterns and petrographic characterization of ditch cuttings. However, the lack of core samples in certain reservoirs represents a challenge for reservoir development plans and further exploration. Typically, core samples from existing or potential reservoirs can be used for interpretation of depositional environment. Understanding the depositional setting of siliciclastics reservoir is fundamental process to exploration and development of hydrocarbon reservoirs and to the multi-phase cycle of the oil and gas industry.
0 kommentar(er)
