Geochemical Characteristics of Formation Water in Carbonate Reservoirs and Its Indication to Hydrocarbon Accumulation
The migration path of formation water plays an indispensable role in hydrocarbon accumulation and preservation. The hydrodynamic field controls the content of various ions in formation water and is an important participant in hydrocarbon evolution. Formation water can basically be used to judge the...
Saved in:
| Main Authors: | , , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wiley
2022-01-01
|
| Series: | Geofluids |
| Online Access: | http://dx.doi.org/10.1155/2022/6095178 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1832562376845557760 |
|---|---|
| author | Zhen Sun Zhen Yang Xiaoning He Cixuan Wan Gang He Qiang Ren Shihu Zhao Wei Cheng Sisi Chen |
| author_facet | Zhen Sun Zhen Yang Xiaoning He Cixuan Wan Gang He Qiang Ren Shihu Zhao Wei Cheng Sisi Chen |
| author_sort | Zhen Sun |
| collection | DOAJ |
| description | The migration path of formation water plays an indispensable role in hydrocarbon accumulation and preservation. The hydrodynamic field controls the content of various ions in formation water and is an important participant in hydrocarbon evolution. Formation water can basically be used to judge the preservation status of oil/gas reservoirs, especially for carbonate reservoirs; the carbonate reservoirs are a typical example in the Gaoqiao area of the Ordos Basin, China. However, it is not easy to evaluate the sealing and integrity of the gas reservoir because hydrocarbon has experienced a multistage charging process and complicated later reconstruction. The geochemical characteristics of Ordovician formation water (100 brine samples from 67 wells in the Ma5 Member) are studied, and their chemical composition is analyzed in the Ordos Basin. The results show that formation water has high overall salinity and is the original sedimentary water of the carbonate reservoir, which is the sealing reservoir and can promote the accumulation of hydrocarbons. This is also associated with stronger water-rock reactions and diagenetic transformations, such as dolomitization. The main (TDS) range is from 40 to 150 g·L−1, with an average of 66.16 g·L−1; the Cl− content in the formation water samples is the highest, followed by Ca2+, Na+, Mg2+, HCO3−, and SO42−. In addition, the (Cl−-Na+)/Mg2+ ratio, Na+/Cl− ratio, Mg2+/Ca2+ ratio, and SO42−×100/Cl− ratio are closely related to gas preservation. The indication function between chemical parameters of formation water and hydrocarbon dynamics can be better understood in carbonate reservoirs by analogy study, so as to improve the accuracy of discriminating favorable hydrocarbon accumulation areas. |
| format | Article |
| id | doaj-art-049354aec5bb4fd1a222eb423a530e88 |
| institution | Kabale University |
| issn | 1468-8123 |
| language | English |
| publishDate | 2022-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geofluids |
| spelling | doaj-art-049354aec5bb4fd1a222eb423a530e882025-02-03T01:22:41ZengWileyGeofluids1468-81232022-01-01202210.1155/2022/6095178Geochemical Characteristics of Formation Water in Carbonate Reservoirs and Its Indication to Hydrocarbon AccumulationZhen Sun0Zhen Yang1Xiaoning He2Cixuan Wan3Gang He4Qiang Ren5Shihu Zhao6Wei Cheng7Sisi Chen8The Sixth Oil Production PlantDepartment of GeologyThe Sixth Oil Production PlantThe Sixth Oil Production PlantThe Sixth Oil Production PlantSchool of Geology Engineering and GeomaticsThe No.1 Oil Production PlantDepartment of GeologyDepartment of GeologyThe migration path of formation water plays an indispensable role in hydrocarbon accumulation and preservation. The hydrodynamic field controls the content of various ions in formation water and is an important participant in hydrocarbon evolution. Formation water can basically be used to judge the preservation status of oil/gas reservoirs, especially for carbonate reservoirs; the carbonate reservoirs are a typical example in the Gaoqiao area of the Ordos Basin, China. However, it is not easy to evaluate the sealing and integrity of the gas reservoir because hydrocarbon has experienced a multistage charging process and complicated later reconstruction. The geochemical characteristics of Ordovician formation water (100 brine samples from 67 wells in the Ma5 Member) are studied, and their chemical composition is analyzed in the Ordos Basin. The results show that formation water has high overall salinity and is the original sedimentary water of the carbonate reservoir, which is the sealing reservoir and can promote the accumulation of hydrocarbons. This is also associated with stronger water-rock reactions and diagenetic transformations, such as dolomitization. The main (TDS) range is from 40 to 150 g·L−1, with an average of 66.16 g·L−1; the Cl− content in the formation water samples is the highest, followed by Ca2+, Na+, Mg2+, HCO3−, and SO42−. In addition, the (Cl−-Na+)/Mg2+ ratio, Na+/Cl− ratio, Mg2+/Ca2+ ratio, and SO42−×100/Cl− ratio are closely related to gas preservation. The indication function between chemical parameters of formation water and hydrocarbon dynamics can be better understood in carbonate reservoirs by analogy study, so as to improve the accuracy of discriminating favorable hydrocarbon accumulation areas.http://dx.doi.org/10.1155/2022/6095178 |
| spellingShingle | Zhen Sun Zhen Yang Xiaoning He Cixuan Wan Gang He Qiang Ren Shihu Zhao Wei Cheng Sisi Chen Geochemical Characteristics of Formation Water in Carbonate Reservoirs and Its Indication to Hydrocarbon Accumulation Geofluids |
| title | Geochemical Characteristics of Formation Water in Carbonate Reservoirs and Its Indication to Hydrocarbon Accumulation |
| title_full | Geochemical Characteristics of Formation Water in Carbonate Reservoirs and Its Indication to Hydrocarbon Accumulation |
| title_fullStr | Geochemical Characteristics of Formation Water in Carbonate Reservoirs and Its Indication to Hydrocarbon Accumulation |
| title_full_unstemmed | Geochemical Characteristics of Formation Water in Carbonate Reservoirs and Its Indication to Hydrocarbon Accumulation |
| title_short | Geochemical Characteristics of Formation Water in Carbonate Reservoirs and Its Indication to Hydrocarbon Accumulation |
| title_sort | geochemical characteristics of formation water in carbonate reservoirs and its indication to hydrocarbon accumulation |
| url | http://dx.doi.org/10.1155/2022/6095178 |
| work_keys_str_mv | AT zhensun geochemicalcharacteristicsofformationwaterincarbonatereservoirsanditsindicationtohydrocarbonaccumulation AT zhenyang geochemicalcharacteristicsofformationwaterincarbonatereservoirsanditsindicationtohydrocarbonaccumulation AT xiaoninghe geochemicalcharacteristicsofformationwaterincarbonatereservoirsanditsindicationtohydrocarbonaccumulation AT cixuanwan geochemicalcharacteristicsofformationwaterincarbonatereservoirsanditsindicationtohydrocarbonaccumulation AT ganghe geochemicalcharacteristicsofformationwaterincarbonatereservoirsanditsindicationtohydrocarbonaccumulation AT qiangren geochemicalcharacteristicsofformationwaterincarbonatereservoirsanditsindicationtohydrocarbonaccumulation AT shihuzhao geochemicalcharacteristicsofformationwaterincarbonatereservoirsanditsindicationtohydrocarbonaccumulation AT weicheng geochemicalcharacteristicsofformationwaterincarbonatereservoirsanditsindicationtohydrocarbonaccumulation AT sisichen geochemicalcharacteristicsofformationwaterincarbonatereservoirsanditsindicationtohydrocarbonaccumulation |