Definition - What does Connate Water mean?
Connate Water or connate fluid refers to the liquids trapped within the pores of sedimentary rocks. This happens as the rocks go through the process of sedimentation and formation of the rocks. In this case, the fluid mostly consists of water, but may also contain other elements like mineral components such as ions. Connate Water is more saline and dense as compared to sea water.
Petropedia explains Connate Water
A thorough understanding of Connate Water is vital if rock diagenesis is to be measured. The solutes present in connate fluids usually precipitate, which diminishes the permeability and porosity of rocks. This affects the hydrocarbon prospectivity, which is essential in the strength, wear and damage resistance of rocks.
Connate Water's chemical components can also produce information about the aquifer's provenance and the host rock's thermal history. The Connate Water often gives direct information regarding the fluid composition as well as the temperature-pressure conditions that were present during the sediment diagenesis.
It is essential to obtain accurate measurement of Connate Water saturation, especially in the case of oil reservoirs. Connate fluid saturation measurement is highly beneficial in oil producing wells, such as in the petrochemical industry.
Connate Water is present in the pores of rock sediments. In the measurement or analysis, the oil is considered under the mobile phase while water is still inside the pore space. This concept should be taken into consideration for more reliable measurement.