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Featured researches published by Wenlong Ding.


Geological Magazine | 2016

Fractures in continental shale reservoirs: a case study of the Upper Triassic strata in the SE Ordos Basin, Central China

Wenlong Ding; Peng Dai; Dingwei Zhu; Yeqian Zhang; Jianhua He; Ang Li; Ruyue Wang

Fractures are important for shale-gas reservoirs with low matrix porosity because they increase the effective reservoir space and migration pathways for shale gas, thus favouring an increased volume of free gas and the adsorption of gases in shale reservoirs, and they increase the specific surface area of gas-bearing shales which improves the adsorption capacity. We discuss the characteristics and dominant factors of fracture development in a continental organic matter-rich shale reservoir bed in the Yanchang Formation based on observations and descriptions of fracture systems in outcrops, drilling cores, cast-thin sections and polished sections of black shale from the Upper Triassic Yanchang Formation in the SE Ordos Basin; detailed characteristics and parameters of fractures; analyses and tests of corresponding fracture segment samples; and the identification of fracture segments with normal logging. The results indicate that the mineral composition of the continental organic-matter-rich shale in the Yanchang Formation is clearly characterized by a low brittle mineral content and high clay mineral content relative to marine shale in the United States and China and Mesozoic continental shale in other basins. The total content of brittle minerals, such as quartz and feldspar, is c . 41%, with quartz and feldspar accounting for 22% and 19% respectively, and mainly occurring as plagioclase with small amounts of carbonate rocks. The total content of clay minerals is high at up to 52%, and mainly occurs as a mixed layer of illite-smectite (I/S) which accounts for more than 58% of the total clay mineral content. The Upper Triassic Yanchang Formation developed two groups of fracture (joint) systems: a NW–SE-trending system and near-E–W-trending system. Multiple types of fractures are observed, and they are mainly horizontal bedding seams and low-dip-angle structural fractures. Micro-fractures are primarily observed in or along organic matter bands. Shale fractures were mainly formed during Late Jurassic – late Early Cretaceous time under superimposed stress caused by regional WNW–ESE-trending horizontal compressive stress and deep burial effects. The extent of fracture development was mainly influenced by multiple factors (tectonic factors and non-tectonic factors) such as the lithology, rock mechanical properties, organic matter abundance and brittle mineral composition and content. Specifically, higher sand content has been observed to correspond to more rapid lithological changes and more extensive fracture development. In addition, higher organic matter content has been observed to correspond to greater fracture development, and higher quartz, feldspar and mixed-layer I/S contents have been observed to correspond to more extensive micro-fracture development. These results are consistent with the measured mechanical properties of the shale and silty shale, the observations of fractures in cores and thin-sections from more than 20 shale-gas drilling wells, and the registered anomalies from gas logging.


Geoscience frontiers | 2012

Fracture development in shale and its relationship to gas accumulation

Wenlong Ding; Chao Li; Chunyan Li; Changchun Xu; Kai Jiu; Weite Zeng; Liming Wu


Marine and Petroleum Geology | 2013

Analysis of the developmental characteristics and major regulating factors of fractures in marine–continental transitional shale-gas reservoirs: A case study of the Carboniferous–Permian strata in the southeastern Ordos Basin, central China

Wenlong Ding; Dingwei Zhu; Junjie Cai; Meilin Gong; Fuyan Chen


Marine and Petroleum Geology | 2016

Investigation of pore structure and fractal characteristics of organic-rich shale reservoirs: A case study of Lower Cambrian Qiongzhusi formation in Malong block of eastern Yunnan Province, South China

Ang Li; Wenlong Ding; Jianhua He; Peng Dai; Shuai Yin; Fei Xie


Journal of Asian Earth Sciences | 2013

Fracture development in Paleozoic shale of Chongqing area (South China). Part one: Fracture characteristics and comparative analysis of main controlling factors

Weite Zeng; Jinchuan Zhang; Wenlong Ding; Song Zhao; Yeqian Zhang; Zhujiang Liu; Kai Jiu


Marine and Petroleum Geology | 2013

Fractures of lacustrine shale reservoirs, the Zhanhua Depression in the Bohai Bay Basin, eastern China

Kai Jiu; Wenlong Ding; WenHui Huang; Yeqian Zhang; Song Zhao; Liangjun Hu


Journal of Petroleum Science and Engineering | 2013

Simulation of paleotectonic stress fields within Paleogene shale reservoirs and prediction of favorable zones for fracture development within the Zhanhua Depression, Bohai Bay Basin, east China

Kai Jiu; Wenlong Ding; WenHui Huang; Shenggang You; Yeqian Zhang; Weite Zeng


Journal of Asian Earth Sciences | 2013

Fracture development in Paleozoic shale of Chongqing area (South China). Part two: Numerical simulation of tectonic stress field and prediction of fractures distribution

Weite Zeng; Wenlong Ding; Jinchuan Zhang; Yeqian Zhang; Ling Guo; Kai Jiu; Yifan Li


Journal of Petroleum Science and Engineering | 2016

Analysis of developmental characteristics and dominant factors of fractures in Lower Cambrian marine shale reservoirs: A case study of Niutitang formation in Cen’gong block, southern China

Ruyue Wang; Wenlong Ding; Yeqian Zhang; Zhe Wang; Xinghua Wang; Jianhua He; Weite Zeng; Peng Dai


Journal of Asian Earth Sciences | 2013

Characteristics of the Middle Jurassic marine source rocks and prediction of favorable source rock kitchens in the Qiangtang Basin of Tibet

Wenlong Ding; Huan Wan; Yeqian Zhang; Guangzhi Han

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Ruyue Wang

China University of Geosciences

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Shuai Yin

China University of Geosciences

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Ang Li

China University of Geosciences

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Jianhua He

China University of Geosciences

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Xinghua Wang

China University of Geosciences

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Yeqian Zhang

China University of Geosciences

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Yang Gu

China University of Geosciences

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Yaxiong Sun

China University of Geosciences

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Jingshou Liu

China University of Geosciences

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Kai Jiu

China University of Geosciences

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