Origin analysis of paleo-overpressure in source rocks based on logging response characteristics: a case study of the Chang 7 member in the Triassic Yanchang formation, Longdong area, Ordos Basin, China
The identification of the origins of source rock palaeo-overpressure based on logging response parameters is frequently influenced by the presence of organic matter. To accurately identify the paleo-overpressure origin of source rocks and employ an appropriate method for paleo-pressure calculation,...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Frontiers Media S.A.
2024-02-01
|
| Series: | Frontiers in Earth Science |
| Subjects: | |
| Online Access: | https://www.frontiersin.org/articles/10.3389/feart.2024.1289510/full |
| _version_ | 1797306987814322176 |
|---|---|
| author | Kaitong Xu Yujia Huang Minggang Tang Jiahao Wu Tengfei Ma |
| author_facet | Kaitong Xu Yujia Huang Minggang Tang Jiahao Wu Tengfei Ma |
| author_sort | Kaitong Xu |
| collection | DOAJ |
| description | The identification of the origins of source rock palaeo-overpressure based on logging response parameters is frequently influenced by the presence of organic matter. To accurately identify the paleo-overpressure origin of source rocks and employ an appropriate method for paleo-pressure calculation, this study proposes a quantitative approach to assess the influence of organic matter content on overpressure analysis. The findings demonstrate that the presence of organic matter in Chang 7 shale leads to an increase in acoustic time difference and a decrease in density. After incorporating the multi-component rock equivalent volume model correction, it is evident that the paleo-overpressure observed in the Chang 7 member is not attributed to undercompaction but rather to fluid expansion mechanisms. In conjunction with the acoustic velocity-density palte method, the paleo-overpressure of the Chang 7 member is attributed to undercompaction and expansion resulting from hydrocarbon generation. The pressure evolution of the Chang 7 member has been reconstructed based on the identification of its paleo-overpressure origin. The distribution characteristics of paleo-pressure recovered based on hydrocarbon generation expansion exhibit a strong correlation with the reservoir. The reliability of the correction method for organic matter influence is demonstrated. The proposed method is not only applicable for the investigation of paleo-pressure, but also holds significant implications for the assessment of pressure within organic-rich intervals. |
| first_indexed | 2024-03-08T00:49:50Z |
| format | Article |
| id | doaj.art-402720560d79443b8c2682119802bd6c |
| institution | Directory Open Access Journal |
| issn | 2296-6463 |
| language | English |
| last_indexed | 2024-03-08T00:49:50Z |
| publishDate | 2024-02-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Earth Science |
| spelling | doaj.art-402720560d79443b8c2682119802bd6c2024-02-15T05:11:23ZengFrontiers Media S.A.Frontiers in Earth Science2296-64632024-02-011210.3389/feart.2024.12895101289510Origin analysis of paleo-overpressure in source rocks based on logging response characteristics: a case study of the Chang 7 member in the Triassic Yanchang formation, Longdong area, Ordos Basin, ChinaKaitong Xu0Yujia Huang1Minggang Tang2Jiahao Wu3Tengfei Ma4PetroChina Tarim Oilfield Company, Exploration Department, Korla, ChinaKorla Branch of Research Institute of Bureau of Geophysical Prospecting INC, China National Petroleum Corporation, Korla, ChinaPetroChina Tarim Oilfield Company, Exploration Department, Korla, ChinaPetroChina Tarim Oilfield Company, Kela Oil and Gas Production Management Zone, Korla, ChinaPipeChina Group, Chongqing, ChinaThe identification of the origins of source rock palaeo-overpressure based on logging response parameters is frequently influenced by the presence of organic matter. To accurately identify the paleo-overpressure origin of source rocks and employ an appropriate method for paleo-pressure calculation, this study proposes a quantitative approach to assess the influence of organic matter content on overpressure analysis. The findings demonstrate that the presence of organic matter in Chang 7 shale leads to an increase in acoustic time difference and a decrease in density. After incorporating the multi-component rock equivalent volume model correction, it is evident that the paleo-overpressure observed in the Chang 7 member is not attributed to undercompaction but rather to fluid expansion mechanisms. In conjunction with the acoustic velocity-density palte method, the paleo-overpressure of the Chang 7 member is attributed to undercompaction and expansion resulting from hydrocarbon generation. The pressure evolution of the Chang 7 member has been reconstructed based on the identification of its paleo-overpressure origin. The distribution characteristics of paleo-pressure recovered based on hydrocarbon generation expansion exhibit a strong correlation with the reservoir. The reliability of the correction method for organic matter influence is demonstrated. The proposed method is not only applicable for the investigation of paleo-pressure, but also holds significant implications for the assessment of pressure within organic-rich intervals.https://www.frontiersin.org/articles/10.3389/feart.2024.1289510/fullorigin identification of palaeo-overpressurelogging responsecorrection of organic matter contentChang 7 memberOrdos Basin |
| spellingShingle | Kaitong Xu Yujia Huang Minggang Tang Jiahao Wu Tengfei Ma Origin analysis of paleo-overpressure in source rocks based on logging response characteristics: a case study of the Chang 7 member in the Triassic Yanchang formation, Longdong area, Ordos Basin, China Frontiers in Earth Science origin identification of palaeo-overpressure logging response correction of organic matter content Chang 7 member Ordos Basin |
| title | Origin analysis of paleo-overpressure in source rocks based on logging response characteristics: a case study of the Chang 7 member in the Triassic Yanchang formation, Longdong area, Ordos Basin, China |
| title_full | Origin analysis of paleo-overpressure in source rocks based on logging response characteristics: a case study of the Chang 7 member in the Triassic Yanchang formation, Longdong area, Ordos Basin, China |
| title_fullStr | Origin analysis of paleo-overpressure in source rocks based on logging response characteristics: a case study of the Chang 7 member in the Triassic Yanchang formation, Longdong area, Ordos Basin, China |
| title_full_unstemmed | Origin analysis of paleo-overpressure in source rocks based on logging response characteristics: a case study of the Chang 7 member in the Triassic Yanchang formation, Longdong area, Ordos Basin, China |
| title_short | Origin analysis of paleo-overpressure in source rocks based on logging response characteristics: a case study of the Chang 7 member in the Triassic Yanchang formation, Longdong area, Ordos Basin, China |
| title_sort | origin analysis of paleo overpressure in source rocks based on logging response characteristics a case study of the chang 7 member in the triassic yanchang formation longdong area ordos basin china |
| topic | origin identification of palaeo-overpressure logging response correction of organic matter content Chang 7 member Ordos Basin |
| url | https://www.frontiersin.org/articles/10.3389/feart.2024.1289510/full |
| work_keys_str_mv | AT kaitongxu originanalysisofpaleooverpressureinsourcerocksbasedonloggingresponsecharacteristicsacasestudyofthechang7memberinthetriassicyanchangformationlongdongareaordosbasinchina AT yujiahuang originanalysisofpaleooverpressureinsourcerocksbasedonloggingresponsecharacteristicsacasestudyofthechang7memberinthetriassicyanchangformationlongdongareaordosbasinchina AT minggangtang originanalysisofpaleooverpressureinsourcerocksbasedonloggingresponsecharacteristicsacasestudyofthechang7memberinthetriassicyanchangformationlongdongareaordosbasinchina AT jiahaowu originanalysisofpaleooverpressureinsourcerocksbasedonloggingresponsecharacteristicsacasestudyofthechang7memberinthetriassicyanchangformationlongdongareaordosbasinchina AT tengfeima originanalysisofpaleooverpressureinsourcerocksbasedonloggingresponsecharacteristicsacasestudyofthechang7memberinthetriassicyanchangformationlongdongareaordosbasinchina |