Author(s)

Ammar Saad*, Xia Yin, Ruitao  Zhang

Affiliation(s)

Institute of Agricultural Economics and Development, Chinese Academy of Agricultural Sciences, Beijng 100091, China.

Corresponding Author

Ammar Saad

ABSTRACT

Based on core observation and casting thin section identification, combined with physical properties, scanning electron microscopy, X-ray diffraction analysis, mercury intrusion experiment, etc., the physical properties and controlling factors of sandstone reservoirs in the Cretaceous Nahr Umr Formation in Halfaya Oilfield, Iraq were discussed.. The results show that the tidal-controlled delta facies sandstone reservoirs in the B member of the Cretaceous Nahr Umr Formation in the Halfaya Oilfield have the physical properties of medium pores and medium permeability. The pore types are mainly intergranular pores and dissolution pores, and the pore throats vary greatly. Strong homogeneity; the controlling factors of reservoir physical properties include sedimentation and diagenesis. Sedimentation affects the type of pore space and pore structure. Reservoirs with good physical properties are developed in areas with strong hydrodynamic conditions and good rock component structure characteristics. In the reservoir, diagenesis has significantly modified the physical properties of the reservoir. The compaction and cementation have caused a large number of pores to be filled. The authigenic minerals and clay minerals not only reduce the pore space, but also cause the pore throat to be blocked and the physical properties to deteriorate., and the secondary pores produced by dissolution improve the physical properties of the reservoir; the best quality reservoirs are developed in the cross-bedding sandstone of tidal-controlled distributary channel facies, which have large particle size, good sorting, high relative content of quartz, The characteristics of low clay mineral content, low cement content, well-developed pores, and large pore throat radius correspond to medium-high porosity and high permeability, which is the focus of reservoir characterization and modeling in the study area.

KEYWORDS

Sandstone reservoir; Physical properties; Controlling factors; Tidal-controlled delta; Nahr Umr Formation; Cretaceous; Halfaya Oilfield; Iraq.

CITE THIS PAPER

Ammar Saad, Xia Yin, Ruitao  Zhang. factors controlling sandstone reservoir properties of cretaceous nahr umr formation in halfaya oilfield, IRAQ. Academic Journal of Earth Sciences. 2023, 1(1): 16-23.

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