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- Title
Characteristics and preliminary study on genesis of black rock series of Upper Permian Dalong Formation in Hefeng area, Hubei Province.
- Authors
Wang Xiu-ping; Mou Chuan-long; Xiao Zhao-hui; Zheng Bin-song; Chen Yao; Wang Qi-yu; Liu VVei-qing
- Abstract
According to detailed observation of the 6 outcrop sections and Well HD1, and in combination with polarizing microscope, X-ray diffraction (XRD) ,field emission scanning electron microscopy (SEM) and organic carbon content (TOG) analysis, the petrological and mineralogical characteristics of black rock series of Upper Permian Dalong Formation in Hefeng area, Hubei Province, is studied. There are three rock types of shale, carbonate and silica rock in Dalong Formation which has high content of organic matter and is composed of black rock series. Shale is the main rock type, carbonate and silica rock are as thin layers among shale. The petrological characteristics of black rock series is advantageous to the influence of late diagenetic fluid and the formation of hydraulic fracturing in the shale gas development phase. lt can be divided into 6 lithology sections in vertical of Dalong Formation, which reflect the sedimentary water body had experienced twice deep-to-shallow evolution processes. Quartz as the main mineral, is dominated by biogenesis and diagenesis type, however, clastogene is the least type. The formation of black rock series in Dalong Formation is mainly affected by oxygen reduction environment in platform basin facies, which is influenced by the retention of the carbonate platform in the circle of platform shelf on three sides, meanwhile is also possibly influenced by upwelling action in deposition process, and also the hot water should be considered, which related to the syngenetic faulting.
- Subjects
HUBEI Sheng (China); CHINA; GEOLOGICAL formations; OUTCROPS (Geology); MINERALOGY; PETROLOGY; X-ray diffraction
- Publication
Natural Gas Geoscience, 2018, Vol 29, Issue 3, p9
- ISSN
1672-1926
- Publication type
Article
- DOI
10.11764/j.issn.1672-1926.2018.01.006