Application of Geological and Geochemical Analysis While Drilling in shale gas development in the Weiyuan area, Sichuan Basin#br#

doi:10.3969/j.issn.1672-7703.2021.01.012

Abstract

Abstract: The Weiyuan area of Sichuan province is an important block of the national shale gas development demonstration project
in Changning-Weiyuan. The drilling target layer is the high-quality shale in the Lower Silurian Longmaxi Formation. Traditional
mud logging and logging-while-drilling (LWD) methods have encountered difficulties in effectively analyzing and evaluating
shale gas reservoirs in real time, which has led to the low penetration rate of high-quality reservoirs and increased risk during
drilling operations. This paper sets out geological evaluation methods for shale gas reservoirs in horizontal wells based on geological and geochemical logging analysis of large numbers of cutting samples taken while drilling in combination with lab test
data from offset coring wells. TOC evaluation is used to support thin layer identification. The parameters of TOC, adsorbed gas
content, and total hydrocarbon content from gas logging are applied to evaluate the gas-bearing properties of shale gas reservoirs.
The favorable shale gas reservoirs are ranked and screened by combining these properties with the additional parameter of brittle
mineral content. Auxiliary methods for horizontal well geosteering are also described. By constantly analyzing the relative variation
range of key parameters—TOC, calcium (Ca) content, and total hydrocarbon content—drilling engineers can adjust the horizontal
drilling trajectory in real time to control the horizontal section window and landing target. Field application of these methods
has improved the development efficiency of shale gas horizontal wells in the Weiyuan area. This study therefore provides
technical reference for the efficient development of similar shale gas reservoirs.

CLC Number:

Zhang Xinxin. Application of Geological and Geochemical Analysis While Drilling in shale gas development in the Weiyuan area, Sichuan Basin#br#[J]. China Petroleum Exploration, 2021, 26(1): 138-146.

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