Tectonic-Lithofacies Paleogeography and Sizeable Reservoir Potential in the Early Cambrian Postrift Depressed Carbonate Ramp, Tarim Basin, NW China
AbstractThe carbonate ramps developed at the postrift depositional stage have become a major field of ultradeep hydrocarbon exploration. Taking the Lower Cambrian Xiaoerblak Formation in the Tarim Basin as an example, the paleotectonic framework and lithofacies paleogeography respons...
| Main Authors: | , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
GeoScienceWorld
2021-10-01
|
| Series: | Lithosphere |
| Online Access: | https://pubs.geoscienceworld.org/lithosphere/article/2021/Special%201/8804537/608217/Tectonic-Lithofacies-Paleogeography-and-Sizeable |
| _version_ | 1818156867315040256 |
|---|---|
| author | Yongjin Zhu Jianfeng Zheng Peng Cao Zhanfeng Qiao Guang Yu LingLi Liu LiLi Huang |
| author_facet | Yongjin Zhu Jianfeng Zheng Peng Cao Zhanfeng Qiao Guang Yu LingLi Liu LiLi Huang |
| author_sort | Yongjin Zhu |
| collection | DOAJ |
| description |
AbstractThe carbonate ramps developed at the postrift depositional stage have become a major field of ultradeep hydrocarbon exploration. Taking the Lower Cambrian Xiaoerblak Formation in the Tarim Basin as an example, the paleotectonic framework and lithofacies paleogeography response, reservoir distribution, and internal architecture difference were systematically analysed based on the data of newly processed 42 2D seismic lines, 9 outcrops, and 22 wells. The results show that (1) the palaeotectonic framework with three palaeohighs and two topographic lows (abbreviated to “TPTT”) dominated the differentiation in the ramp system (association) at the Xiaoerblak depositional stage. High-energy grain shoals and mounds occurred around the palaeohighs, and the sediment composition was further complicated by ancient ocean currents. Three subtypes of ramp are recognized: the slope-plateau ramp dominated by grain shoal on the northern margin of the paleohigh of the southwestern Tarim, homocline ramp dominated by the mound-shoal complex on the Keping-Wensu area lower high, and isolated island type in the Lunnan-Yaha lower high. (2) Xiaoerblak reservoirs mainly occur in the high-energy facies belts in the middle ramps around the palaeohighs because original pores were effectively preserved in early dolomitization and reconstructed at the burial stage. Reservoirs are predicted to mainly distribute in the high-energy mound-shoal zones around three palaeohighs (low uplifts) with an area of 9×104 km2. Different ramp systems show different reservoir properties. There are mainly type II reservoirs (porosity range of 1.8-4.5%, permeability range of 0.5-10×10−3 μm2) with sustained distribution and the largest size in the grain shoals at the slope-plateau ramp, which may be the potential favorable hydrocarbon exploration zone. Based on the example anatomy, the differentiation in the carbonate ramp systems forming at the postrift subsidence stage was structurally dominated. This means that it is crucial to deepen the understanding of the presedimentation palaeotectonic framework for the prediction of promising reservoirs and assessment of reservoir properties. |
| first_indexed | 2024-12-11T15:05:07Z |
| format | Article |
| id | doaj.art-f4268d9ac8d64ffe81339f84cb3d46be |
| institution | Directory Open Access Journal |
| issn | 1941-8264 1947-4253 |
| language | English |
| last_indexed | 2024-12-11T15:05:07Z |
| publishDate | 2021-10-01 |
| publisher | GeoScienceWorld |
| record_format | Article |
| series | Lithosphere |
| spelling | doaj.art-f4268d9ac8d64ffe81339f84cb3d46be2022-12-22T01:00:58ZengGeoScienceWorldLithosphere1941-82641947-42532021-10-012021Special 110.2113/2021/8804537Tectonic-Lithofacies Paleogeography and Sizeable Reservoir Potential in the Early Cambrian Postrift Depressed Carbonate Ramp, Tarim Basin, NW ChinaYongjin Zhu0http://orcid.org/0000-0002-5862-2908Jianfeng Zheng1http://orcid.org/0000-0003-2940-8213Peng Cao2Zhanfeng Qiao3Guang Yu4LingLi Liu5LiLi Huang6PetroChina Hangzhou Research Institute of Geology Hty 5angzhou 310023 ChinaPetroChina Hangzhou Research Institute of Geology Hty 5angzhou 310023 ChinaPetroChina Hangzhou Research Institute of Geology Hty 5angzhou 310023 ChinaPetroChina Hangzhou Research Institute of Geology Hty 5angzhou 310023 ChinaPetroChina Hangzhou Research Institute of Geology Hty 5angzhou 310023 ChinaPetroChina Hangzhou Research Institute of Geology Hty 5angzhou 310023 ChinaPetroChina Hangzhou Research Institute of Geology Hty 5angzhou 310023 China AbstractThe carbonate ramps developed at the postrift depositional stage have become a major field of ultradeep hydrocarbon exploration. Taking the Lower Cambrian Xiaoerblak Formation in the Tarim Basin as an example, the paleotectonic framework and lithofacies paleogeography response, reservoir distribution, and internal architecture difference were systematically analysed based on the data of newly processed 42 2D seismic lines, 9 outcrops, and 22 wells. The results show that (1) the palaeotectonic framework with three palaeohighs and two topographic lows (abbreviated to “TPTT”) dominated the differentiation in the ramp system (association) at the Xiaoerblak depositional stage. High-energy grain shoals and mounds occurred around the palaeohighs, and the sediment composition was further complicated by ancient ocean currents. Three subtypes of ramp are recognized: the slope-plateau ramp dominated by grain shoal on the northern margin of the paleohigh of the southwestern Tarim, homocline ramp dominated by the mound-shoal complex on the Keping-Wensu area lower high, and isolated island type in the Lunnan-Yaha lower high. (2) Xiaoerblak reservoirs mainly occur in the high-energy facies belts in the middle ramps around the palaeohighs because original pores were effectively preserved in early dolomitization and reconstructed at the burial stage. Reservoirs are predicted to mainly distribute in the high-energy mound-shoal zones around three palaeohighs (low uplifts) with an area of 9×104 km2. Different ramp systems show different reservoir properties. There are mainly type II reservoirs (porosity range of 1.8-4.5%, permeability range of 0.5-10×10−3 μm2) with sustained distribution and the largest size in the grain shoals at the slope-plateau ramp, which may be the potential favorable hydrocarbon exploration zone. Based on the example anatomy, the differentiation in the carbonate ramp systems forming at the postrift subsidence stage was structurally dominated. This means that it is crucial to deepen the understanding of the presedimentation palaeotectonic framework for the prediction of promising reservoirs and assessment of reservoir properties.https://pubs.geoscienceworld.org/lithosphere/article/2021/Special%201/8804537/608217/Tectonic-Lithofacies-Paleogeography-and-Sizeable |
| spellingShingle | Yongjin Zhu Jianfeng Zheng Peng Cao Zhanfeng Qiao Guang Yu LingLi Liu LiLi Huang Tectonic-Lithofacies Paleogeography and Sizeable Reservoir Potential in the Early Cambrian Postrift Depressed Carbonate Ramp, Tarim Basin, NW China Lithosphere |
| title | Tectonic-Lithofacies Paleogeography and Sizeable Reservoir Potential in the Early Cambrian Postrift Depressed Carbonate Ramp, Tarim Basin, NW China |
| title_full | Tectonic-Lithofacies Paleogeography and Sizeable Reservoir Potential in the Early Cambrian Postrift Depressed Carbonate Ramp, Tarim Basin, NW China |
| title_fullStr | Tectonic-Lithofacies Paleogeography and Sizeable Reservoir Potential in the Early Cambrian Postrift Depressed Carbonate Ramp, Tarim Basin, NW China |
| title_full_unstemmed | Tectonic-Lithofacies Paleogeography and Sizeable Reservoir Potential in the Early Cambrian Postrift Depressed Carbonate Ramp, Tarim Basin, NW China |
| title_short | Tectonic-Lithofacies Paleogeography and Sizeable Reservoir Potential in the Early Cambrian Postrift Depressed Carbonate Ramp, Tarim Basin, NW China |
| title_sort | tectonic lithofacies paleogeography and sizeable reservoir potential in the early cambrian postrift depressed carbonate ramp tarim basin nw china |
| url | https://pubs.geoscienceworld.org/lithosphere/article/2021/Special%201/8804537/608217/Tectonic-Lithofacies-Paleogeography-and-Sizeable |
| work_keys_str_mv | AT yongjinzhu tectoniclithofaciespaleogeographyandsizeablereservoirpotentialintheearlycambrianpostriftdepressedcarbonateramptarimbasinnwchina AT jianfengzheng tectoniclithofaciespaleogeographyandsizeablereservoirpotentialintheearlycambrianpostriftdepressedcarbonateramptarimbasinnwchina AT pengcao tectoniclithofaciespaleogeographyandsizeablereservoirpotentialintheearlycambrianpostriftdepressedcarbonateramptarimbasinnwchina AT zhanfengqiao tectoniclithofaciespaleogeographyandsizeablereservoirpotentialintheearlycambrianpostriftdepressedcarbonateramptarimbasinnwchina AT guangyu tectoniclithofaciespaleogeographyandsizeablereservoirpotentialintheearlycambrianpostriftdepressedcarbonateramptarimbasinnwchina AT lingliliu tectoniclithofaciespaleogeographyandsizeablereservoirpotentialintheearlycambrianpostriftdepressedcarbonateramptarimbasinnwchina AT lilihuang tectoniclithofaciespaleogeographyandsizeablereservoirpotentialintheearlycambrianpostriftdepressedcarbonateramptarimbasinnwchina |