Accumulation Conditions of Shale Oil and Gas in Member 3 of the Shahejie Formation in the Eastern Sag of Liaohe Depression

WEI Fei-fei，ZHANG Jin-chuan，ZHANG Peng，LONG Shuai，LU Ya-ya，HUANG Yu-qi

doi:10.11764/j.issn.1672-1926.2015.07.1405

2015 , Vol. 26 >Issue 7: 1405 - 1413

DOI: https://doi.org/10.11764/j.issn.1672-1926.2015.07.1405

Accumulation Conditions of Shale Oil and Gas in Member 3 of the Shahejie Formation in the Eastern Sag of Liaohe Depression

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1.School of Energy,China University of Geosciences,Beijing 100083,China;
2.Key Laboratory of the Ministry of Education of Marine Reservoir Evolution and Oil and Gas Accumulations,
Key Laboratory of the Ministry of Land and Resources of Shale Gas Exploration and Evaluation,Beijing 100083,China

Received date: 2014-12-01

Revised date: 2014-12-29

Online published: 2015-07-10

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Abstract

Based on the shale sedimentary background,geochemical characteristics,reservoir characteristics and gas content etc.,we analyse the formation conditions of shale oil and gas and the reservoir forming pattern,and select the favorable exploration area.The results show that the thickness of member 3 in the study area is large,commonly between 100-500m.The organic carbon mass fraction is in the range of 0.1%-6% with an average of 2.91%.Thermal maturity of organic matter is low with an average value of 0.6%.The reservoir space is mainly inter-granular pore and dissolved pore.The brittle mineral content is high such as quartz and carbonate rocks,so it has certain fragility.Furthermore,the results of isothermal absorption show that shale has high performances of gas absorption,and the total gas content is 0.65-5.11m³/t,with an average value of 2.32%.Finally,through the multi-factors superposition method of shale oil and gas accumulation conditions,we believe the Niuju-Changtan subsag in the north and south of Jiazhangsi-Erjiegou subsag is a favorable area for oil and gas exploration in the Eastern Sag of Liaohe Depression.

Key words： Shale gas; Eastern Sag of Liaohe Depression; Member 3 of the Shahejie Formation; Geochemical characteristics; Gas content; Favorable area

Cite this article

WEI Fei-fei，ZHANG Jin-chuan，ZHANG Peng，LONG Shuai，LU Ya-ya，HUANG Yu-qi . Accumulation Conditions of Shale Oil and Gas in Member 3 of the Shahejie Formation in the Eastern Sag of Liaohe Depression[J]. Natural Gas Geoscience, 2015 , 26(7) : 1405 -1413 . DOI: 10.11764/j.issn.1672-1926.2015.07.1405

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