A near-shore clastic-carbonate mixing mode in a continental rift basin (early Oligocene, eastern Shijiutuo Uplift, Bohai Bay Basin, China): sedimentology, reservoir characteristics and exploration practice
Abstract A comprehensive sedimentary and reservoir analysis was conducted based on seismic, well logging, core and relative test data, taking Members 1 and 2 of Shahejie Formation of the early Oligocene in the steep slope belt, eastern Shijiutuo Uplift (STU), Bohai Bay Basin (BBB) as a case. The stu...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2020-09-01
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| Series: | Journal of Palaeogeography |
| Subjects: | |
| Online Access: | http://link.springer.com/article/10.1186/s42501-020-00074-w |
| _version_ | 1819125307391606784 |
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| author | Xiao-Feng Du Hao Liu Xiao-Bo Huang Zhang-Qiang Song Wei Xu Can Zhang |
| author_facet | Xiao-Feng Du Hao Liu Xiao-Bo Huang Zhang-Qiang Song Wei Xu Can Zhang |
| author_sort | Xiao-Feng Du |
| collection | DOAJ |
| description | Abstract A comprehensive sedimentary and reservoir analysis was conducted based on seismic, well logging, core and relative test data, taking Members 1 and 2 of Shahejie Formation of the early Oligocene in the steep slope belt, eastern Shijiutuo Uplift (STU), Bohai Bay Basin (BBB) as a case. The study indicates that a near-shore mixed fan deposit formed in the study area and developed characteristics and pattern of a high-quality reservoir. The mixed clastic-carbonate rocks constitute Members 1 and 2 of Shahejie Formation which developed along the steep slope belt and is named as a near-shore mixed fan. The mixed fan of the study area is mainly composed of microfacies of proximal channel, mixed deposited channel, mixed clastic beach, mixed bioclastic (grain) beach, with vertical multi-stage superimposition feature, and basically a similar shape as modern near-shore fans. It constitutes a new depositional type developing in the steep slope belt of a characteristic and complex lacustrine rift basin in the study area. This mixed fan in the steep slope of eastern STU is controlled by comprehensive factors including tectonics, clastic material supply, climate, palaeogeomorphology and hydrodynamic conditions. The reservoir quality of Members 1 and 2 of Shahejie Formation of eastern STU is, however, actually controlled by the sedimentary environment and diagenesis processes. Coarse-grained mixed rocks of near-shore fans, rich in bioclastics, can form excellent reservoirs, characterized by resistance to compaction, easy to dissolution, little influenced by burial depth and high production of oil and gas, which enable them become key exploration targets of medium-deep strata of BBB. Analyses of high-quality reservoir, its controlling factors and the oil and gas exploration implications of the near-shore mixed fan developing in the study area give a deeper insight into discussions of the same type of mixed rocks of other lacustrine rift basins worldwide. |
| first_indexed | 2024-12-22T07:38:03Z |
| format | Article |
| id | doaj.art-484a25e6b5d043f196eed40ab428ac69 |
| institution | Directory Open Access Journal |
| issn | 2524-4507 |
| language | English |
| last_indexed | 2024-12-22T07:38:03Z |
| publishDate | 2020-09-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Palaeogeography |
| spelling | doaj.art-484a25e6b5d043f196eed40ab428ac692022-12-21T18:33:49ZengElsevierJournal of Palaeogeography2524-45072020-09-019111810.1186/s42501-020-00074-wA near-shore clastic-carbonate mixing mode in a continental rift basin (early Oligocene, eastern Shijiutuo Uplift, Bohai Bay Basin, China): sedimentology, reservoir characteristics and exploration practiceXiao-Feng Du0Hao Liu1Xiao-Bo Huang2Zhang-Qiang Song3Wei Xu4Can Zhang5China National Offshore Oil CorporationSchool of Ocean Sciences, China University of GeosciencesChina National Offshore Oil CorporationChina National Offshore Oil CorporationChina National Offshore Oil CorporationChina National Offshore Oil CorporationAbstract A comprehensive sedimentary and reservoir analysis was conducted based on seismic, well logging, core and relative test data, taking Members 1 and 2 of Shahejie Formation of the early Oligocene in the steep slope belt, eastern Shijiutuo Uplift (STU), Bohai Bay Basin (BBB) as a case. The study indicates that a near-shore mixed fan deposit formed in the study area and developed characteristics and pattern of a high-quality reservoir. The mixed clastic-carbonate rocks constitute Members 1 and 2 of Shahejie Formation which developed along the steep slope belt and is named as a near-shore mixed fan. The mixed fan of the study area is mainly composed of microfacies of proximal channel, mixed deposited channel, mixed clastic beach, mixed bioclastic (grain) beach, with vertical multi-stage superimposition feature, and basically a similar shape as modern near-shore fans. It constitutes a new depositional type developing in the steep slope belt of a characteristic and complex lacustrine rift basin in the study area. This mixed fan in the steep slope of eastern STU is controlled by comprehensive factors including tectonics, clastic material supply, climate, palaeogeomorphology and hydrodynamic conditions. The reservoir quality of Members 1 and 2 of Shahejie Formation of eastern STU is, however, actually controlled by the sedimentary environment and diagenesis processes. Coarse-grained mixed rocks of near-shore fans, rich in bioclastics, can form excellent reservoirs, characterized by resistance to compaction, easy to dissolution, little influenced by burial depth and high production of oil and gas, which enable them become key exploration targets of medium-deep strata of BBB. Analyses of high-quality reservoir, its controlling factors and the oil and gas exploration implications of the near-shore mixed fan developing in the study area give a deeper insight into discussions of the same type of mixed rocks of other lacustrine rift basins worldwide.http://link.springer.com/article/10.1186/s42501-020-00074-wEarly Oligocene, eastern Shijiutuo Uplift, Bohai Bay BasinContinental rift basinMixed carbonate-siliciclastic fanHigh-quality reservoirs |
| spellingShingle | Xiao-Feng Du Hao Liu Xiao-Bo Huang Zhang-Qiang Song Wei Xu Can Zhang A near-shore clastic-carbonate mixing mode in a continental rift basin (early Oligocene, eastern Shijiutuo Uplift, Bohai Bay Basin, China): sedimentology, reservoir characteristics and exploration practice Journal of Palaeogeography Early Oligocene, eastern Shijiutuo Uplift, Bohai Bay Basin Continental rift basin Mixed carbonate-siliciclastic fan High-quality reservoirs |
| title | A near-shore clastic-carbonate mixing mode in a continental rift basin (early Oligocene, eastern Shijiutuo Uplift, Bohai Bay Basin, China): sedimentology, reservoir characteristics and exploration practice |
| title_full | A near-shore clastic-carbonate mixing mode in a continental rift basin (early Oligocene, eastern Shijiutuo Uplift, Bohai Bay Basin, China): sedimentology, reservoir characteristics and exploration practice |
| title_fullStr | A near-shore clastic-carbonate mixing mode in a continental rift basin (early Oligocene, eastern Shijiutuo Uplift, Bohai Bay Basin, China): sedimentology, reservoir characteristics and exploration practice |
| title_full_unstemmed | A near-shore clastic-carbonate mixing mode in a continental rift basin (early Oligocene, eastern Shijiutuo Uplift, Bohai Bay Basin, China): sedimentology, reservoir characteristics and exploration practice |
| title_short | A near-shore clastic-carbonate mixing mode in a continental rift basin (early Oligocene, eastern Shijiutuo Uplift, Bohai Bay Basin, China): sedimentology, reservoir characteristics and exploration practice |
| title_sort | near shore clastic carbonate mixing mode in a continental rift basin early oligocene eastern shijiutuo uplift bohai bay basin china sedimentology reservoir characteristics and exploration practice |
| topic | Early Oligocene, eastern Shijiutuo Uplift, Bohai Bay Basin Continental rift basin Mixed carbonate-siliciclastic fan High-quality reservoirs |
| url | http://link.springer.com/article/10.1186/s42501-020-00074-w |
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