Processing method for determining formation water and/or surface water type genetic environments

Abstract

The invention provides a processing method for determining formation water and / or surface water type genetic environments. The method includes: taking a water sample; detecting ion salinity (S.Ci, unit mg / L) and ion chemical formula quantities (numerically equal to relative atomic mass of ions) of Na<+>, K<+>, Mg<2+>, Ca<2+>, Cl<->, SO4<2->, HCO3<-> and CO3<2-> in the water sample; calculating ion content associated six types of data including ion millimole concentration, ion unit charge millimole concentration, ion unit charge millimole fraction, ion unit charge millimole concentration ratio, comprehensive genetic coefficient and comprehensive judgment coefficient according to the ion salinity (S.Ci) of Na<+>, K<+>, Mg<2+>, Ca<2+>, Cl<->, SO4<2->, HCO3<-> and CO3<2-> and atomic mass (Mi) of corresponding ions so as to determine a corresponding genetic environment of the water sample. The method is applicable to determination of formation water and surface water type salt geological environment characteristics, solves an objective corresponding relation between a formation water type and a geological environment and provides a new way for judgment of formation water geological environments of oil and gas reservoirs.

Description

technical field [0001] The present invention relates to a processing method for determining formation water and / or surface water water type genetic environment, in particular to an analysis method for formation water genetic environment under surface water and oil and gas reservoir conditions, belonging to oil and gas exploration and development geology analytical skills. 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. [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. There are four main sources of formation water: one is sedimentary water, w...

AI Technical Summary

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;

[0011] Third, the Surin classification fails to establish a realistic causal relationship between the stability of representative formation water-type salts and the geological environment in which the salts are formed;

[0012] Fourth, the Surin classification does not really distinguish oilfield water from non-oilfield water

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