It can provide perfect formation water resisitivity in argillaceous sand- stone by using SP(spontaneous potential)data.

On the basis of the theory of sequence stratigraphy,identifying sequence stratigraphy boundaries using well logging of SP(spontaneous potential),AC(acoustic time),RA(apparent resistivity),electric conductivity were comprehensively analyzed.

Two-dimensional forward of spontaneous potential in interlayer oxidation zone sandstone type uranium deposits

Strata physical nature is good for geophysical prospecting in lqe coalfield,there are less interference in the area, while the spontaneous potential curve anomalies are clearly reflected.

The traditional model used to describe the distribution of natural electric field in open hole is interfacial potential that shows spontaneous potential distributes on the interface between formation and mud.

The text building up the return equation with natural potential data of well tests and analyses coal sulphur content in labo- ratories,expanses the application that the natural potential data of the well tests in actual work.

According to the relation of natural potential logging data and reservoir water salinity,based on the layer thickness emendation,slime emendation,temperature emendation and oil & gas effect emendation of natural potential,formation water electrical resistivity can be confirmed accurately.

Variation of natural potentials, cathodic polarization curves and variation of stable current density with time for carbon steels in flowing fresh water with different velocities and in three different surface states are tested.

Reason Analysis for SP Curve Abnormality;

Simulated Experiment and Study SP Logging;

EFFECT AND INFLUENTIAL FACTORS SP FOR OIL;

Theory-based of electric double layer and electrokinetic,this paper states the main factors causing electrokinetic phenomenon are abnormal pressure and salinity decrease and multiphase flow in oil field development,and investigates the positive and negative changes of self-potential which is the expression of the streaming potential,and hig.

Combiningthis method with phase state hydrocarbon method and self-potential method, the authorsobtained satisfactory results over some known oil and gas fields.