Guizhou Academy of Geologic Survey

Guiyang, China

Guizhou Academy of Geologic Survey

Guiyang, China
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He J.,Chengdu Institute of Geology and Mineral Resources | Liu W.,Chengdu Institute of Geology and Mineral Resources | Yu Q.,Chengdu Institute of Geology and Mineral Resources | Qiu Z.,Petrochina | And 4 more authors.
Scientia Geologica Sinica | Year: 2017

The Lower Carboniferous Jiusi Formation in Guizhou Province is one of the key study areas for the exploration of shale gas in the new area and new strata. A large amount of the survey work had been carried out in it, however little progress had been achieved. In this work, we evaluated the geological characteristics of the Lower Carboniferous Jiusi shale(eg. the distribution, geochemical characteristics, reservoir properties of the shale and the total gas content of the core samples)on the basis of outcrops data, core samples and laboratory analysis. It can be concluded that the Jiusi Formation is deposited in the lagoon and inter-platform basin environment. The organic matter of the black shale is typed as kerogen II1 and II2 in the southwest of Guizhou Province, and typed as kerogen I in the south of Guizhou Province. The total organic content of this samples are changing from 1% to 2%. Ro is in the range of 1% ~2.5%. The influence of the thermal anomaly, which is caused by the hydrothermal mineral and hot spring, is likely to have a local influence but not common in the hole region. The percentage composition of quartz is bigger than 40%. The reservoir space is in the form of huge hole and middle-huge hole in the lower and upper strata of Jiusi Formation respectively. The porosity of the shale is range from 2.0%~10.0%. The gas bearing capacity is good in the south of Guizhou Province. The gas is in the absorbing state in the key layer. In the southwest, the gas is in the free state, which is controlled by the fault and ground stress. Meanwhile, three sweet spots are recognized by intersecting multiple factors in one map on the basis of above work and practical experience. The three sweet spots are located in the region of Wangmo-Ziyun-Luodian, Luodian-Kedu and Panlong-Shaomi respectively. The total area of them is more than 1 448 km2. © 2017, Science Press. All right reserved.


Ma D.-S.,Guizhou Academy of Geologic Survey | Xiong X.-G.,Guizhou Academy of Geologic Survey | Jiang K.-Y.,Guizhou Academy of Geologic Survey | Li Y.-S.,Guizhou Academy of Geologic Survey | And 2 more authors.
Geological Bulletin of China | Year: 2011

There exist only very few outcrops of Triassic strata on both sides of the Bangong Co-Nujiang junction zone. Early Triassic period was the beginning of the initial evolution of the Nujiang Ocean basin. The large-scale continuous marine regression and crustal uplift caused the denudation of the strata; hence the whole Bangong Co-Nujiang junction zone lacks a complete Triassic stratigraphic system, and there exists no complete material record for the study of the evolution of the Nujiang Ocean. The discovery of the Triassic strata based on fossils provides an ideal basis for the study of the evolution of the Nujiang Ocean basin, and also supplies basic data to regional stratigraphic correlation, establishment of stratigraphic framework and paleoenvironment analysis.

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