Analysis method for identifying water type of formation water and/or surface water

Abstract

The invention provides an analysis method for identifying water type of formation water and / or surface water. The method comprises the following steps of sampling a water sample; detecting the ion mineralizing degrees (SCi, unit: mg / L) of Na<+>, K<+>, Mg<2+>, Ca<2+>, Cl<->, SO4<2->, HCO3<-> and CO3<2-> in the water sample, and quantity of ion chemical structural formulas (the number is equivalent to the relative atom mass of the ions); according to the obtained ion mineralizing degrees (SCi) of Na<+>, K<+>, Mg<2+>, Ca<2+>, Cl<->, SO4<2->, HCO3<-> and CO3<2-> in the water sample, and corresponding atom mass of the ions (Mi), calculating the atom millimole concentration, ion unit charge millimole concentration, ion unit charge millimole fraction, ion unit charge millimole concentration ratio, integrated factor coefficient and integrated judging coefficient related to the ion content, judging the water type of the water sample. The method has the advantages that the water type of formation water and surface water can be objectively determined, the method is especially suitable for determining the water type of formation water and surface water in the hydrocarbon reservoir rock porosity, and a new way is provided for acknowledging and studying the features of the formation water of the oil and gas reservoir layer.

Description

technical field [0001] The invention relates to an analysis method for identifying formation water and / or surface water type, in particular to an analysis method for formation water type under surface water and oil and gas reservoir conditions, which belongs to geological analysis technology for oil and gas exploration and development. Background technique [0002] In the process of exploration and development of oil and gas reservoirs, objectively and accurately judging the water types of formation water and surface water can guide the determination of the geological environment experienced by reservoir rocks during the formation of oil and gas reservoirs. Natural water is a general term for surface water and formation water formed by non-human factors in nature. [0003] Formation water refers to movable water and bound water stored in underground rocks, including edge water, bottom water, interlayer water, water layer water and hot spring water in oil and gas layers. The...

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Problems solved by technology

[0010] Second, the Surin classification ignores the pointing role of some dominant ions in the geological environment, for example, when Na in formation water + +K + The ion unit charge millimolar concentration is much greater than that of Cl - ion, HCO 3 - +CO 3 2- and Ca 2+ The ion unit charge millimolar concentration is also significantly higher than that of SO 4 2- ions and Mg 2+ When the ion unit charge is at the millimolar concentration, the Sulin classification can only divide NaHCO 3 Water type or Na 2 SO 4 Water type, does not divide the actual Ca(HCO 3 ) 2 water type, which will inevitably lead to obvious differences between the water type determined by Sulin's classification and the actual situation, and even confusion in naming and concepts, such as MgCl 2 This is an ocean water type, and sometimes in inland rivers and freshwater lakes, MgCl in the Surin classification will also appear. 2 water type, thus causing confusion in the classification of surface water and formation water

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