中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
A new method for predicting the shale distribution of the Wufeng Formation in the Upper Yangtze Region, China

文献类型:期刊论文

作者Sun, Shasha2,3; Zhang, Linna1; Wang, Hongyan2,3; Dong, Dazhong2,3; Zhang, Rong4
刊名BSGF-EARTH SCIENCES BULLETIN
出版日期2020-03-09
卷号191页码:15
关键词Wufeng Formation spatial interpolation distribution reconstruction shale gas paleo-topography
ISSN号0037-9409
DOI10.1051/bsgf/2020004
英文摘要

Taking the Late Ordovician Wufeng Formation (WFF) shale in the Upper Yangtze region as an example, we conducted a lithofacies distribution, thickness quantification, and paleo-topographic reconstruction of the Late Ordovician graptolite zones. Specifically, we focused on the Late Katian Dicellograptus complexus and the Early Hirnantian Metabolograptus extraordinarius within a chronostratigraphic framework, using the Geographic Information System (GIS) and 310 stratigraphic sections (incl. drilling) obtained from the Geobiodiversity Database (GBDB). Reconstruction of the geographic distribution indicates that the WFF and the synchronous sediments in the Upper Yangtze region contain 8 litho-stratigraphic units, which are geographically distributed across 7 provinces/municipalities and do not exhibit significant variations in lithofacies. The black graptolite shale extends in a broad swath from east to west within the basin, while the other lithofacies deposited during the same period are present on the periphery of the basin. All these strata were deposited in a normal neritic epicontinental sea environment, except for the flysch sediments in the southern Hunan area. The thickness reconstruction involves a comparison of three spatial interpolation methods, including Inverse Distance Weighting (IDW), Kriging, and the Radial Basis Function (RBF). Based on a general verification, IDW is considered to be the optimal method since it has the minimum standard deviation and variance. Based on the contours obtained from the IDW model, the WFF black shale is estimated to have an overall area of 0.67 x 10(6) km(2), an average thickness of 6.2 m, and a total volume of 3902 km(3). This shale was deposited over a 2.83 Ma period. Therefore, the volume of shale deposited per million years is estimated to be 1379 km(3)/my and the average thickness of shale deposited per million years is 2.37 m/my. The Hirnantian paleo-water-depth values obtained using 275 sections were used to infer the Late Katian paleo-topography. These results suggest that the Yangtze platform was surrounded by ancient highlands to the west, south, and north, exhibiting a paleo-geographic framework characterized by one uplift and four depressions. This setting blocked water circulation, causing the water to be contained and forming a closed and restricted marine environment, which was one of the major factors controlling the deposition of the organic-rich WFF shale. With the advent of the big data era of geology, the methodology of GIS-based technology is readily exportable to any resource play having spatial distribution pattern. Results can be provided rapidly and efficiently generated from geological data.

WOS关键词GAS
资助项目China National Science and Technology Major Project[2017ZX05035-001]
WOS研究方向Geology
语种英语
WOS记录号WOS:000519041200001
出版者EDP SCIENCES S A
资助机构China National Science and Technology Major Project
源URL[http://ir.nigpas.ac.cn/handle/332004/31664]  
专题中国科学院南京地质古生物研究所
通讯作者Sun, Shasha
作者单位1.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, Nanjing 210008, Jiangsu, Peoples R China
2.PetroChina, Res Inst Petr Explorat & Dev, Beijing 100083, Peoples R China
3.PetroChina, Unconvent Oil & Gas Key Lab, Langfang 065007, Hebei, Peoples R China
4.PetroChina, Xinjiang Oilfield Branch Co, Res Inst Explorat & Dev, Karamay 834000, Xinjiang, Peoples R China
推荐引用方式
GB/T 7714
Sun, Shasha,Zhang, Linna,Wang, Hongyan,et al. A new method for predicting the shale distribution of the Wufeng Formation in the Upper Yangtze Region, China[J]. BSGF-EARTH SCIENCES BULLETIN,2020,191:15.
APA Sun, Shasha,Zhang, Linna,Wang, Hongyan,Dong, Dazhong,&Zhang, Rong.(2020).A new method for predicting the shale distribution of the Wufeng Formation in the Upper Yangtze Region, China.BSGF-EARTH SCIENCES BULLETIN,191,15.
MLA Sun, Shasha,et al."A new method for predicting the shale distribution of the Wufeng Formation in the Upper Yangtze Region, China".BSGF-EARTH SCIENCES BULLETIN 191(2020):15.

入库方式: OAI收割

来源:南京地质古生物研究所

浏览0
下载0
收藏0
其他版本

除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。