class=MsoNormal style="MARGIN: 0cm 0cm 0pt">font-kerning: 0pt">With ce prefix = ns0 ns = "urn:schemas-microsoft-com:office:smarttags" />ceName>ce prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" />ceName w:st="on">font-kerning: 0pt">SichuanceName>font-kerning: 0pt">ceName>font-kerning: 0pt"> ceType>ceType w:st="on">font-kerning: 0pt">BasinceType>font-kerning: 0pt">ceType>font-kerning: 0pt"> as focus, this paper introduces the depositional environment, geochemical and reservoir characteristics, gas concentration and prospective resource potential of three different types of shale in country-region>ce>country-region w:st="on">ce w:st="on">font-kerning: 0pt">Chinace>country-region>font-kerning: 0pt">ce>country-region>font-kerning: 0pt">: marine shale, marine-terrigenous shale and terrigenous shale. The study on shale reservoirs in the Lower Paleozoic in ceName>ceName w:st="on">font-kerning: 0pt">SichuanceName>font-kerning: 0pt">ceName>font-kerning: 0pt"> ceType>ceType w:st="on">font-kerning: 0pt">BasinceType>font-kerning: 0pt">ceType>font-kerning: 0pt"> firstly indicated that Cambrian and Silurian marine shale developed lots of micro-and nanometer-sized pores, which is quite similar to the conditions in ce>ce w:st="on">font-kerning: 0pt">North Americace>font-kerning: 0pt">ce>font-kerning: 0pt">. Through comprehensive evaluation, it is thought that the Weiyuan-Changning area is the core area for shale gas exploration and development.font-kerning: 0pt">ce prefix = o ns = "urn:schemas-microsoft-com:office:office" />