Analysis on drilling techniques and shale gas compacity of Well QTD-1

Abstract:

Well QTD-1 is a shale gas geological survey well drilled in Tongren, northeast Guizhou Province. A brief description of investigative techniques such as drilling, well logging, gas logging are given in this paper. Through core drilling, gas logging, well logging and field data interpretation, the regional lithologic units have also been verified, with some geological parameters of shale gas within the Niutitang Formation obtained, including the development characteristics of the black shale, the gas bearing capacity. In conclusion, the marine shale of the Niutitang Formation is the main gasbearing strata, and it is distributed extensively and stable in the investigated area. Generally, the gas content increases with the depth; the maximum value of the total hydrocarbon is 4%, the gas production within the broken zone of the core is over 2600mL, and the maximum value of the field gas bearing capacity is 1.97m3/t. All these characteristics indicate a large gas capacity, and show a good prospect for the exploration and development of the shale gas in Tongren area.

Key words:Well QTD-1; drilling techniques; shale gas; well logging; gas bearing feature