Origin and identification of low resistivity reservoirs in North Jiangsu Basin;

The distinguish feature of classic reservoir in dongxin Oilfield is the variety of resistivity including low resistivity reservoir.

The log responses and parameters of low resistivity hydrocarbon bearing sand reservoirs have been studied.

Microcosmic influence factor for electrical properties of low-resistivity reservoir in Jiyang Depression;

The statistics for 57 oil and gas layers of 22 oilfields in the Tarim Basin shows that reservoirs of poor physical properties are prone to have low resistivity and those condensate gas reservoirs of moderate fluid density or light oil reservoirs are prone to form low resistivity oil layers.

Classification of low resistivity oil layers in Erdos Basin is introduced,and their forming mechanism is analyzed.

The low resistivity oil layer is well identified by the identification method of swept layer based on the inverted frequency spectrum characteristics of log differential signals.

Under an extensional geological condition, low resistivity oil zone caused by high irreducible water saturation is formed in weak and unstable water dynamic areas where the change of water dynamic results in special reservoir lithological structure.

It should not be ignored that the depositional interfaces conversion causes low resistivity oil zones distribute widely and abundantly in some parts of the layers.