A Comparative Study of the Geological Feature of Marine Shale Gas between China and the United States
Received date: 2015-01-24
Revised date: 2015-04-22
Online published: 2015-09-10
Through detailed studies of marine shale gas in China and investigation of typical shale gas zones in the United States,similarities and differences of geological features of the shale gas in USA and China were summarized.The comparative study is of important theoretical and practical significance for marine shale gas in Sichuan Basin.(1)Barnett,Marcellus and Haynesville shale basins are foreland basin,while Sichuan basin in Paleozoic is intra-craton basin.Their depositional environments are deep water shelf,mainly siliceous and calcareous shale,with high brittleness mineral content.(2)TOC of Barnett shale is 3%-13%，averaged at 4.5%;Marcellus is 3%-12%,averaged at 4.0%;and Haynesville shale is 0.5%-4%.TOC of Wufeng-Longmaxi and Qiongzhusi is 1.5%-3% and 2.5%-4.5%,respectively.(3)Maturity of three major shale formations is moderate,while that of Sichuan Basin is at over-mature stage.The RO values of the Barnett,Marcellus and Haynesville formations are 0.5%-2.1%，1.2%-3.5%，and 1.2%-3%,respectively.However,the ROvalues of the Longmaxi and Qiongzhusi formations are 2.5%-4.5% and 1.5%-3%,respectively.(4)Barnett shale has thickness of 30-180m,porosity of 4%-5%,and permeability less than 1×10-3μm2;Marcellus shale has thickness of 15-60m,porosity averagely of 10%,and permeability less than 1×10-3μm2;Haynesville shale has thickness of 70-100m,porosity of 8%-9%,and permeability less than 5×10-3μm2.Longmaxi shale has thickness of 25-120m,porosity of 3%-10%,and permeability of(0.01-1)×10-3μm2;Qiongzhuxi shale has thickness of 40-100m,porosity of 0.1%-3%,and permeability of(0.01-42)×10-3μm2.(5)Gas contents of Barnett,Marcellus and Haynesville shale are 4.2-9.9,1.70-2.83 and 2.5-9m3/t,respectively,and that of Longmaxi and Qiongzhusi shale are 1.7-4.5 and 0.55-1.2 m3/t,respectively.(6)Except Qiongzhuxi shale,the other four shale formations have good sedimentary cover,which is conducive to gas preservation.(7)American shales have more favorable surface conditions,mostly plains,while mostly hills in Sichuan Basin.(8)Except Haynesville shale,fractures are well developed in other shale formations.(9)Shale gases from both the USA and China have rich resource potential.The Geological and technically recoverable resources of Longmaxi Formation are 17.5×1012m3 and 1.77×1012m3,respectively while that of Qiongzhusi Formation are 8.86×1012m3 and 0.886×1012m3,respectively.
WANG Shu-fang，DONG Da-zhong，WANG Yu-man，LI Xin-jing，HUANG Jin-liang，GUAN Quan-zhong . A Comparative Study of the Geological Feature of Marine Shale Gas between China and the United States[J]. Natural Gas Geoscience, 2015 , 26(9) : 1666 -1678 . DOI: 10.11764/j.issn.1672-1926.2015.09.1666
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