Author(s)

Wei Yan^1*, Minggang Feng¹, Yue Wang², Shuai Liu¹, Kaixuan Li², Xianran Zhao², Wenjun Liang³

¹Sinopec Exploration Company, Chengdu, China.
²Schlumberger China S.A., Chengdu, China.
³Exploration and Development Research Institute of Huabei Oil Field Company, PetroChina, Renqiu, China.

Shale gas reservoir is characterized by complex lithology with ultra-low porosity and permeability, which brings many challenges in the formation evaluation. Elemental Capture Spectroscopy Sonde (ECS) can be used to measure the elements and get the formation of the mineralogy. LithoScanner is a newly-generated spectroscopy tool, which can be used to measure both inelastic and capture spectra, providing estimation of more elements, including silicon, calcium, iron, sulfur, titanium, gadolinium, aluminum, potassium, sodium, magnesium, manganese, carbon, etc. LithoScanner can be directly used to measure the total organic carbon content (TOC) in the formation, and provide solutions to the lithology classification and heterogeneous rock analysis (HRA). The changing lithology and borehole rugosity have little influence on the direct measurement of TOC by LithoScanner. LithoScanner shows great advantage in accuracy when comparing with other methods using triple-combo. The systematic lithology classification method in shale gas reservoir using LithoScanner is correlatable in multi-wells. The brittleness index from mineralogy can be applied to hydraulic stimulation. HRA results offered guides in both the coring sample selection and the experiment. The advantages of LithoScanner in shale gas formation evaluation were presented in this paper, and the workflow can also be applied to other reservoirs.

LithoScanner, ECS, TOC, Lithology Classification, HRA, Fuling Shale Gas

Yan, W. , Feng, M. , Wang, Y. , Liu, S. , Li, K. , Zhao, X. and Liang, W. (2018) The Application of a New Neutron Induced Gamma Ray Spectroscopy Tool in Evaluation the Shale Gas in Fuling Shale Gas Field. Open Journal of Yangtze Oil and Gas, 3, 93-103. doi: 10.4236/ojogas.2018.32008.