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Shale gas reservoir characteristics of Ordovician-Silurian formations in the central yangtze area, China

Frontiers of Earth Science 2017年第1期11卷 184-201页

作者： Chang'an SHAN Tingshan ZHANG Yong WEI Zhao ZHANG School of Earth Sciences and Engineering Xi'an Shiyou University Xi'an 710065 China State Key Laboratory of Oil and Gas Reservoir Geology and Exploration Southwest Petroleum University Chengdu 610500 China School of Geoscience and Technology Southwest Petroleum University Chengdu 610500 China Exploration and Development Research Institute Southwest Oil & Gas field Company CNPC Chengdu 610041 China Exploration and Development department Zhejiang Oilfield Company CNPC Hangzhou 310023 China

The characteristics of a shale gas reservoir and the potential of a shale gas resource of Ordovician-Silurian age in the north of the central yangtze area were determined. Core samples from three wells in the study area were subjected to thin-section examination, scanning electron microscopy, nuclear magnetic resonance testing, X-ray diffraction mineral analysis, total organic carbon （TOC） testing, maturity testing, gas-bearing analysis, and gas component and isothermal adsorption experiments. A favorable segment of the gas shale reservoir was found in both the Wufeng Formation and the lower part of the Longmaxi Formation; these formations were formed from the late Katian to early Rhuddanian. The high-quality shale layers in wells J1, J2, and J3 featured thicknesses of 54.88 m, 48.49 m, and 52.00 m, respectively, and mainly comprised carbonaceous and siliceous shales. Clay and brittle minerals showed average contents of 37.5% and 62.5% （48.9% quartz）, respectively. The shale exhibited type Ⅱ1 kerogens with a vitrinite reflectance ranging from 1.94% to 3.51%. TOC contents of 0.22%-6.05% （average, 2.39%） were also observed. The reservoir spaces mainly included micropores and microfractures and were characterized by low porosity and permeability. Well J3 showed generally high gas contents, i.e., 1.12-3.16 m^3/t （average 2.15 m^3/t）, and its gas was primarily methane. The relatively thick black shale reservoir featured high TOC content, high organic material maturity, high brittle mineral content, high gas content, low porosity, and low permeability. Shale gas adsorption was positively correlated with TOC content and organic maturity, weakly positive correlated with quartz content, and weakly negatively correlated with clay content. Therefore, the Wufeng and Longmaxi formations in the north of the central yangtze area have a good potential for shale gas exploration.

关键词： reservoir characteristic shale gas Upper Ordovician Lower Silurian central yangtze area

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