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Single Sandbody Architecture of Sublacustrine Fan in a Depression Lacustrine Basin—Insights from Triassic Chang-6 Oil-bearing Interval in Heshui Area of Ordos Basin, China(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2021年第05期
Page:
850-967
Research Field:
基础地质与矿产地质
Publishing date:

Info

Title:
Single Sandbody Architecture of Sublacustrine Fan in a Depression Lacustrine Basin—Insights from Triassic Chang-6 Oil-bearing Interval in Heshui Area of Ordos Basin, China
Author(s):
QU Xue-feng1 WANG Wu-rong23 XIE Qi-chao1 YUE Da-li23* LIU Jian1 WU Sheng-he23 ZHANG Xue-ting23 HU Jia-jing4
(1. Research Institute of Exploration and Development, Changqing Oilfield Company, PetroChina, Xi'an 710018, Shaanxi, China; 2. College of Geosciences, China University of Petroleum, Beijing 102249, China; 3. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China; 4. China National Oil and Gas Exploration and Development Corporation, Beijing 100034, China)
Keywords:
sublacustrine fan single sandbody quantitative scale superimposition pattern three-dimensional architecture model Chang-6 oil-bearing interval Heshui area Ordos Basin
PACS:
P618.13; TE122
DOI:
10.19814/j.jese.2020.10041
Abstract:
The theories involved in gravity flow deposits have become a hot and difficult topic of international sedimentology research. Compared with submarine fan reservoirs, the study on the single sandbody architecture of sublacustrine fan reservoirs is relatively weak, especially the study on quantitative architecture models is still rarely reported. Based on the integrated analysis of the core, well logging and production data, the architectural characteristics of Triassic Chang-6 oil-bearing interval in Heshui area of Ordos Basin were investigated, and the distribution of the single sandbody of sublacustrine fan in depression lacustrine basin was determined. The results show that 6 architecture elements are identified in sublacustrine fan, including main channel, branch channel, lobe, lobe edge, inter-channel and inter-lobe. Based on the single sandbody boundary recognition mark of exploration wells and horizontal wells, the boundary of single sandbody was divided. The lobe complex is composed by multiple individual lobes as the compensational superimposition pattern, which is related to the short-term base-level changing. The single lobe is tongue-shaped on the plane and narrower in the proximal region while wider in the distal region. There is an obvious linear positive correlation between maximum width and maximum thickness, with the aspect ratio ranging from 100 to 160. Finally, according to the analysis results of the architecture in the study area, the three-dimensional architecture model of sublacustrine fan in the depression lacustrine basin is established. The research results have important guiding significance for the adjustment of the oilfield development program and the exploitation of remaining oil.

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Last Update: 2021-09-30