Lower Paleozoic marine shale is widely distributed in Southeast Chongqing and features in large thickness

shallow burial depth and high organic abundance.The information from Well Yuke 1 helps us to well understand the characteristics and gas potential of the dark shale.The thickness of dark shale in the Cambrian Niutitang Formation is 50.2 m in total.Our studies reveal that the shale has favorable hydrocarbon accumulation conditions

with an average total organic carbon content(TOC) of 5.63% and an average vitrinite reflectance(R

o

) of 3%.Calculation through logging analysis

isothermal adsorption test and linear regression shows that the total gas content of the shale is within the range of 1.0-3.5 m

3

/t.Well Yuke 1 demonstrates that the Niutitang Formation dark shale is characterized by high organic content

high maturity and large gas content

indicating great potential of shale gas resources.