A Crossplot for Mud Logging Interpretation of Unconventional Gas Shale Reservoirs and Its Application

2015 ◽  
Vol 8 (1) ◽  
Author(s):  
Wen-rui Shi ◽  
Shao-yang Yuan ◽  
Yu-long Chen ◽  
Lin-qi Zhu ◽  
Chong Zhang
Keyword(s):  
Gas Shale ◽  
Unconventional Gas ◽  
Shale Reservoirs ◽  
Mud Logging

scholarly journals A Crossplot for Mud Logging Interpretation of Unconventional Gas Shale Reservoirs and its Application

2015 ◽  
Vol 8 (1) ◽  
pp. 265-271 ◽  
Author(s):  
Wen-rui Shi ◽  
Chong Zhang ◽  
Shao-yang Yuan ◽  
Yu-long Chen ◽  
Lin-qi Zhu
Keyword(s):  
Oil And Gas ◽  
Water Layer ◽  
Gas Shale ◽  
Time Data ◽  
Time Ratio ◽  
Testing Data ◽  
Contrast Coefficient ◽  
Shale Reservoirs ◽  
Mud Logging ◽  
Drilling Time

The drilling time data of gas logging are used to calculate drilling time ratio of the reservoir, and the total hydrocarbon data are used to calculate hydrocarbon contrast coefficient and to establish the drilling time ratio--hydrocarbon contrast coefficient crossplot. The standards of distinguishing the boundaries of hydrocarbon zones, hydrocarbonaceous water layers and dry layers are determined according to the statistics of regional oil testing data. Based on the standards, the crossplot is divided into three areas: hydrocarbon zone, hydrocarbonaceous water layer and dry layer, which are used in mud logging interpretation of abnormal shows in oil and gas layers. This method is widely used for low-resistivity reservoirs, fracture reservoirs, shale gas layers, and especially in the oil and gas zone with weak show and a single component. It is more applicable and accurate than some conventional interpretation methods such as the triangle plot, PIXLER plot, dual light hydrocarbon alkyl ratio and hydrocarbons ratio (3H).

Petrophysical and geochemical characterization of potential unconventional gas shale reservoirs in the southern Karoo Basin, South Africa

2019 ◽  
Vol 212 ◽  
pp. 103249 ◽  
Author(s):  
Steffen Nolte ◽  
Claire Geel ◽  
Alexandra Amann-Hildenbrand ◽  
Bernhard M. Krooss ◽  
Ralf Littke
Keyword(s):  
South Africa ◽  
Gas Shale ◽  
Unconventional Gas ◽  
Geochemical Characterization ◽  
Karoo Basin ◽  
Shale Reservoirs
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