The significance for unconventional petroleum exploration of a good classification system for gravity-flow deposits, with examples from the Yanchang Formation

2022 ◽  
pp. 461-484
Author(s):  
A.J. (Tom) van Loon ◽  
Renchao Yang ◽  
Carlos Zavala ◽  
Wei Yin ◽  
Aiping Fan
Keyword(s):  
Classification System ◽  
Petroleum Exploration ◽  
Gravity Flow ◽  
Yanchang Formation ◽  
Good Classification

Toward an Intelligent e-Learning System Using Document Classification Techniques

2015 ◽  
Vol 24 (4) ◽  
pp. 533-547
Author(s):  
Yousef Abuzir
Keyword(s):  
Classification System ◽  
Learning System ◽  
Document Management ◽  
Test Results ◽  
Educational Materials ◽  
Concept Hierarchy ◽  
Good Classification ◽  
E Learning ◽  
Management Techniques ◽  
E Mail

AbstractThe purpose of this study is to propose and develop an intelligent e-learning system based on advanced document management techniques at Al-Quds Open University (QOU). In this article, we focus on a case using e-mail contents as supplement educational materials at QOU. We describe how the interactive classification system based on concept hierarchy can simplify this task. This system provides the functions to index, classify, and retrieve a collection of e-mail messages based on user profiles. By automatically indexing e-mail messages using our E-mail Classification System for e-Learning, instructors and/or students can easily find their messages and find the topics. The test results of our system evaluation showed that a good classification quality has been achieved, with a precision of 77.4%, recall of 90%, and F-measure of 82.8.

Lacustrine mixed siliciclastic-carbonate sedimentary rocks in Paleogene Funing Formation of the Subei Basin, eastern China: characteristics and origin

2020 ◽  
pp. 1-50
Author(s):  
Wei Li ◽  
Xiaomin Zhu ◽  
Qidong Liu ◽  
Shifa Zhu ◽  
Heyong Li
Keyword(s):  
Eastern China ◽  
Petroleum Exploration ◽  
Gravity Flow ◽  
Geochemical Data ◽  
Small Scale ◽  
Carbonate Sediments ◽  
Sedimentary Characteristics ◽  
Section Data ◽  
Dominant Component ◽  
Mixed Sediments

The study of sedimentary characteristics and genetic mechanism of the mixed siliciclastic-carbonate sediments (MSCSs) is not only the focus of sedimentary geology, but also the important issue in petroleum exploration and development. We discover the lacustrine MSCSs, both the interstratified siliciclastic-carbonate sediments and the textural mixture of siliciclastic and carbonate materials (s-MSCSs) in the second member of Paleogene Funing Formation (E1f2) in Gaoyou and Jinhu sags, Subei Basin, eastern China. We use core, mud-log and thin section data to clarify the E1f2 s-MSCSs into 5 types, and we also use geochemical data of the E1f2 mudstone including XRD whole rock, XRD clay and trace elements to quantitatively analyze lake paleosalinity. The E1f2 s-MSCSs mainly consist of siliciclasts, ooids, intraclasts and mud, could be siliciclasts-dominated, allochems-dominated or without dominant component. We analyze that mixed sediments occur under either traction flow or gravity flow. The s-MSCSs of traction flow origin develop small-scale wavy cross-bedding and consist of siliciclasts and ooids of similar size; the s-MSCSs of gravity flow origin develop massive

scholarly journals The Lithological Features of Sublacustrine Fans and Significance to Hydrocarbon Exploration: A Case Study of the Chang 7 Interval of the Yanchang Formation, Southeastern Ordos Basin, North China

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-22
Author(s):  
Bo Yang ◽  
Hongjun Qu ◽  
Jianchao Shi ◽  
Yuqi Bai ◽  
Wenhou Li ◽  
...  
Keyword(s):  
Deep Water ◽  
Ordos Basin ◽  
Hydrocarbon Exploration ◽  
Source Rocks ◽  
Lateral Margin ◽  
Gravity Flow ◽  
Provenance Analysis ◽  
Delta Front ◽  
Depositional Sequence ◽  
Yanchang Formation

The Chang 7 interval of the Upper Triassic Yanchang Formation in the Ordos Basin represents a typical deep lacustrine depositional sequence. On the basis of field outcrops, cores, well logs, light/heavy mineral provenance analysis, and petrological studies, we evaluated the characteristics of deep-water gravity flow deposition of the Chang 7 interval and constructed a depositional model. The sediments mainly came from the northeast of the study area, and multiple sublacustrine fans were deposited in the center of the basin. Different from the deep-marine fan, the sublacustrine fan in the study area develops under the background of gentle slope without any erosional canyon between the fan and delta front. Gravity flow deposits in the study area can categorised into three groups: sand debris flow deposits, turbidity current deposits, and deep-water mudstone deposits. The main channel and branch channel are mainly developed with thick massive sandy debris sandstone, while the channel lateral margin and branch channel lateral margin are mainly developed with middle massive sandy debris sandstones and turbidite sandstones, which from bottom to top, the thickness of sand layer becomes thinner and the grain size becomes smaller. Thin mudstone is developed between channels; the lobe fringe includes sheet-like turbidite sandstones and deep lake mudstones. The widely distribute, good quality source rocks ( TOC = 2 % – 6 % ) developed in deep lacustrine have attained the peak stage of oil generation ( R o = 0.9 % – 1.2 % ). The superimposition of the sublacustrine fan sand bodies and the wide distribution of good quality source rocks favor the formation of large lithologic reservoirs characterized by source–reservoir integration, self-generation and self-storage, and near-source accumulation.

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