The Open Petroleum Engineering Journal




(Discontinued)

ISSN: 1874-8341 ― Volume 12, 2019

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


The Open Petroleum Engineering Journal , 2015, 8

Wen-rui Shi, Shao-yang Yuan, Yu-long Chen, Lin-qi Zhu, Chong Zhang

Geophysics and Oil Resource Institute of Yangtze University, Wuhan, Hubei, China, 430100.

Electronic publication date 25/6/2015
[DOI: 10.2174/1874834120150625E007]




Abstract:

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).


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