Pore Characteristics of Shale Gas Reservoirs from the Lower Paleozoic in the South of Sichuan Basin
Received date: 2015-03-28
Revised date: 2015-05-22
Online published: 2015-08-10
Based on the data from drilling and core samples,the characteristics of organic matter,porosity,microscopic pore and pore structure from the Lower Paleozoic Qiongzhusi and Longmaxi formations marine shale gas reservoirs in the south of Sichuan basin were studied,by using a lot of experimental methods such as organic geochemistry,organic petrology,reservoir pore analysis.The results show that the Lower Paleozoic marine shale in the south of Sichuan basin is characterized by high organic carbon content(most TOC>2.0%),high thermal maturity(ROm=2.3%-3.8%),and low porosity(1.16%-6.87%).The organic carbon content and thermal maturity of the Qiongzhusi Formation shale is higher than those of the Longmaxi Formation shale,while the porosity of the Qiongzhusi Formation shale is lower than that of the Longmaxi Formation shale.There are inter-granular pore,dissolved pore,crystal particle pore,particle edge pore and organic pore in the Lower Paleozoic Qiongzhusi Formation and Longmaxi Formation shale samples.More micro-nano scale pores are developed in the Longmaxi Formation shales than those in the Qiongzhusi Formation shales.The inter-granular pore,dissolved pore and organic pore are most common,which are main storage space for shale gas.The microscopic pores in the Lower Paleozoic shale are mainly composed of micropore and mesopore,and a little micropore.The micropore and mesopore in the Qiongzhusi Formation shale account for 83.92% of the total pore volume.The micropore and mesopore in the Longmaxi Formation shale account for 78.17% of the total pore volume.Thus,micropore and mesopore are the main contribution of microscopic pores in the Lower Paleozoic shale gas reservoir in the south of Sichuan Basin.
LI Xian-qing，WANG Yuan，GUO Man，ZHANG Ji-zhen，ZHAO Pei，XU Hong-wei，YANG Jie，WANG Fei-yu . Pore Characteristics of Shale Gas Reservoirs from the Lower Paleozoic in the South of Sichuan Basin[J]. Natural Gas Geoscience, 2015 , 26(8) : 1464 -1471 . DOI: 10.11764/j.issn.1672-1926.2015.08.1464
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