Abstract
Based on constant rate mercury injection experiment, casting thin section identification, scanning electron microscope observation, clay mineral X-ray and rock specific surface area analysis, the controlling factors of matrix acidizing potential of low-permeability sandstone reservoir in fault depression lacustrine basin were determined from three aspects: pore filling, throat filling and pore-throat combination characteristics. It is concluded that provenance controls the plane partition of reservoir pore fillings. Burial depth controls the longitudinal zoning of key filling material in reservoir throat. The difference of rock structure in sedimentary facies - microfacies controlling zone leads to the change of pore-throat assemblage pattern. The matrix acidizing scheme of low permeability sandstone reservoir in fault depression basin can be formulated according to the law of “provenance zoning, buried depth zoning and being controlled by microfacies in zone”, and the implementation scheme of pre-acid, main acid and post-acid can be put forward respectively. This method can effectively promote the integration process of exploration and development of low permeability clastic reservoir in mature exploration area.
Highlights
In recent years, the increasing demand for oil and gas exploration and production has led to a shift in direction and focus towards unconventional oil and gas resources
Low permeability reservoirs in fault depression basins are characterized by diverse provenance, large burial depth and diverse sedimentary facies, which make the reservoir structure and type complex[1,2,3,4,5,6,7]
For matrix acidizing of low permeability sandstone reservoir, the integrated thinking of exploration and development is how to establish the connection between reservoir geology, development geology and oilfield chemistry
Summary
The increasing demand for oil and gas exploration and production has led to a shift in direction and focus towards unconventional oil and gas resources. Low permeability reservoirs in fault depression basins are characterized by diverse provenance, large burial depth and diverse sedimentary facies, which make the reservoir structure and type complex[1,2,3,4,5,6,7].
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