Shale gas accumulation conditions and gas-bearing characteristics of the Lower Cambrian Niutitang Formation in Well Changye-1 in northwestern Hunan Province
Abstract: To evaluate the accumulation conditions and gas-bearing properties of shale gas in the Lower Cambrian Niutitang Formation, northwestern Hunan Province, the first shale gas parameter well (Well Changye-1) that takes the Niutitang Formation as the target horizon in the Hunan Province was sel...
Main Authors: | , , , , , , |
---|---|
Format: | Article |
Language: | English |
Published: |
KeAi Communications Co., Ltd.
2016-12-01
|
Series: | Petroleum Research |
Online Access: | http://www.sciencedirect.com/science/article/pii/S2096249517300431 |
id |
doaj-8978e00d01194eb7b8f894c78be83ea1 |
---|---|
record_format |
Article |
spelling |
doaj-8978e00d01194eb7b8f894c78be83ea12020-11-25T02:03:08ZengKeAi Communications Co., Ltd.Petroleum Research2096-24952016-12-0112205212Shale gas accumulation conditions and gas-bearing characteristics of the Lower Cambrian Niutitang Formation in Well Changye-1 in northwestern Hunan ProvinceTuo Lin0Shujing Bao1Jinchuan Zhang2Zhi Zhou3Kun Yuan4Bo Li5Shengyu Yang6Oil and Gas Survey, China Geological Survey, Beijing 100037, China; Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education, Wuhan 430074, China; Corresponding author.Oil and Gas Survey, China Geological Survey, Beijing 100037, ChinaSchool of Energy Resources, China University of Geoscience, Beijing 100083, ChinaOil and Gas Survey, China Geological Survey, Beijing 100037, ChinaOil and Gas Survey, China Geological Survey, Beijing 100037, ChinaChina Huadian Engineering Co., Ltd., Beijing 100035, ChinaSchool of Energy Resources, China University of Geoscience, Beijing 100083, ChinaAbstract: To evaluate the accumulation conditions and gas-bearing properties of shale gas in the Lower Cambrian Niutitang Formation, northwestern Hunan Province, the first shale gas parameter well (Well Changye-1) that takes the Niutitang Formation as the target horizon in the Hunan Province was selected preferably and drilled, cumulatively revealing the thickest dark shale horizon of the Niutitang Formation among the single-well drillings in China, with a true vertical thickness of 674.5m. Through analyzing the core samples in terms of organic geochemistry, rock mineralogy and reservoir properties, the black shale horizons in the Niutitang Formation of Well Changye-1 have high organic carbon content (average 3.9%), moderate maturity (equivalent Ro average 2.6%), high brittle mineral content (quartz content average 50.1%), low clay mineral content (average 32.4%), low porosity (1.7%) and low permeability (1.32×10-3mD), and well-developed meso to micro-pores and fractures, indicating good conditions for shale gas accumulation. Field desorption and laboratory isothermal adsorption measurements on core samples show that Well Changye-1 has good gas-bearing properties, and gas content generally increases with depth. The black shale horizons at the depth of 1100-1250m have an average organic carbon content up to 10.1%, total gas content of 0.5-2.1m3/t and 3.7-6.4m3/t, and this is the most favorable depth for shale gas development, indicating that the Niutitang Formation has good a prospect for shale gas exploration. Due to huge sedimentary thickness, the black shale in the middle-lower part of the Niutitang Formation should be given priority for exploration. Key words: shale gas, gas-bearing properties, Niutitang Formation, Well Changye-1, northwestern Hunanhttp://www.sciencedirect.com/science/article/pii/S2096249517300431 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Tuo Lin Shujing Bao Jinchuan Zhang Zhi Zhou Kun Yuan Bo Li Shengyu Yang |
spellingShingle |
Tuo Lin Shujing Bao Jinchuan Zhang Zhi Zhou Kun Yuan Bo Li Shengyu Yang Shale gas accumulation conditions and gas-bearing characteristics of the Lower Cambrian Niutitang Formation in Well Changye-1 in northwestern Hunan Province Petroleum Research |
author_facet |
Tuo Lin Shujing Bao Jinchuan Zhang Zhi Zhou Kun Yuan Bo Li Shengyu Yang |
author_sort |
Tuo Lin |
title |
Shale gas accumulation conditions and gas-bearing characteristics of the Lower Cambrian Niutitang Formation in Well Changye-1 in northwestern Hunan Province |
title_short |
Shale gas accumulation conditions and gas-bearing characteristics of the Lower Cambrian Niutitang Formation in Well Changye-1 in northwestern Hunan Province |
title_full |
Shale gas accumulation conditions and gas-bearing characteristics of the Lower Cambrian Niutitang Formation in Well Changye-1 in northwestern Hunan Province |
title_fullStr |
Shale gas accumulation conditions and gas-bearing characteristics of the Lower Cambrian Niutitang Formation in Well Changye-1 in northwestern Hunan Province |
title_full_unstemmed |
Shale gas accumulation conditions and gas-bearing characteristics of the Lower Cambrian Niutitang Formation in Well Changye-1 in northwestern Hunan Province |
title_sort |
shale gas accumulation conditions and gas-bearing characteristics of the lower cambrian niutitang formation in well changye-1 in northwestern hunan province |
publisher |
KeAi Communications Co., Ltd. |
series |
Petroleum Research |
issn |
2096-2495 |
publishDate |
2016-12-01 |
description |
Abstract: To evaluate the accumulation conditions and gas-bearing properties of shale gas in the Lower Cambrian Niutitang Formation, northwestern Hunan Province, the first shale gas parameter well (Well Changye-1) that takes the Niutitang Formation as the target horizon in the Hunan Province was selected preferably and drilled, cumulatively revealing the thickest dark shale horizon of the Niutitang Formation among the single-well drillings in China, with a true vertical thickness of 674.5m. Through analyzing the core samples in terms of organic geochemistry, rock mineralogy and reservoir properties, the black shale horizons in the Niutitang Formation of Well Changye-1 have high organic carbon content (average 3.9%), moderate maturity (equivalent Ro average 2.6%), high brittle mineral content (quartz content average 50.1%), low clay mineral content (average 32.4%), low porosity (1.7%) and low permeability (1.32×10-3mD), and well-developed meso to micro-pores and fractures, indicating good conditions for shale gas accumulation. Field desorption and laboratory isothermal adsorption measurements on core samples show that Well Changye-1 has good gas-bearing properties, and gas content generally increases with depth. The black shale horizons at the depth of 1100-1250m have an average organic carbon content up to 10.1%, total gas content of 0.5-2.1m3/t and 3.7-6.4m3/t, and this is the most favorable depth for shale gas development, indicating that the Niutitang Formation has good a prospect for shale gas exploration. Due to huge sedimentary thickness, the black shale in the middle-lower part of the Niutitang Formation should be given priority for exploration. Key words: shale gas, gas-bearing properties, Niutitang Formation, Well Changye-1, northwestern Hunan |
url |
http://www.sciencedirect.com/science/article/pii/S2096249517300431 |
work_keys_str_mv |
AT tuolin shalegasaccumulationconditionsandgasbearingcharacteristicsofthelowercambrianniutitangformationinwellchangye1innorthwesternhunanprovince AT shujingbao shalegasaccumulationconditionsandgasbearingcharacteristicsofthelowercambrianniutitangformationinwellchangye1innorthwesternhunanprovince AT jinchuanzhang shalegasaccumulationconditionsandgasbearingcharacteristicsofthelowercambrianniutitangformationinwellchangye1innorthwesternhunanprovince AT zhizhou shalegasaccumulationconditionsandgasbearingcharacteristicsofthelowercambrianniutitangformationinwellchangye1innorthwesternhunanprovince AT kunyuan shalegasaccumulationconditionsandgasbearingcharacteristicsofthelowercambrianniutitangformationinwellchangye1innorthwesternhunanprovince AT boli shalegasaccumulationconditionsandgasbearingcharacteristicsofthelowercambrianniutitangformationinwellchangye1innorthwesternhunanprovince AT shengyuyang shalegasaccumulationconditionsandgasbearingcharacteristicsofthelowercambrianniutitangformationinwellchangye1innorthwesternhunanprovince |
_version_ |
1724949289273131008 |