TITLE:
Rock Physical Experimental Research in Tanan Volcanic Rock Reservoir
AUTHORS:
Lailin Li, Haibo Zhao, Xuehui Han
KEYWORDS:
Tuffaceous Rock-Fragment Sandstones, Acoustic Velocity, Porosity, Shale Content, Density, Water Saturation
JOURNAL NAME:
Journal of Applied Mathematics and Physics,
Vol.2 No.6,
May
16,
2014
ABSTRACT: Under the condition of simulated formation
temperature and pressure, the compression and shear wave velocity of the
tuffaceous conglomerates and rock-fragment sandstones of the reservoirs in K1t,
k1n group of Cretaceous system in Tanan are measured. The effects of lithology,
mineral content, density, porosity, shale content, and water saturation on the
acoustic velocity of the athrogenic rock are studied. Within the limits of our
observation, some rules are found: (1) the velocity of the fine tuffaceous
conglomerates is remarkably greater than that of the tuffaceous rock-fragment
sandstones with good physical property; (2) the compression velocity increases
with fragment content, and decreases with quartz and feldspar content in the mud;
(3) the compression velocity increases with density, especially, in tuffaceous
rock-fragment sandstones, the velocity keeps a good relation with density in
form of power function; (4) compression and shear wave velocity decreases with
porosity and shale content, velocity of the tuffaceous rock-fragment sandstones
keeps a good relation with porosity and shale content in form of negative
linear function, but effects of shale content is only 1/5 to 1/10 of that of
the porosity, hence can be neglected; (5) with porosity increases, compression
wave velocity is relatively sensitive to fluid alternation, and the rang in
which velocity varies keeps positive correlation with porosity. The result
provides a foundation for the research of seismic and logging data evaluation
approaches in athrogenic rock reservoirs, Haita basin.