Geochemical Research on the Multi-period Petroleum Accumulation of
Kaili Residual Reservoir

doi:10.11885/j.issn.1674-5086.2012.12.27.01

Abstract

Abstract:

Lots of oil & gas showings have been found in Kaili，and several wells gain low yield in Huzhuang and its surrounding
areas. Abundant oil & gas seepage and bitumen showings can be seen in outcrop profile from Ordovician to Permian Systems.
That hydrocarbon and bitumen coexist in several layers reveals that Kaili Residual Reservoir has undergone multistage reservoir
formation and late reformation. Based on the research on geological characteristics and origin of reservoir bitumen and surface
oil，the periods of reservoir-forming of Kaili Residual Reservoir is discussed from thermal history of source rocks，K – Ar
dating of autogenic illites，and fluid inclusion homogenization temperature. The reservoir bitumen and surface oil contain 25-
norhopane，while the distribution of normal paraffin hydrocarbons is complete and chromatographic base lines are uplifted in
varying degrees，showing that the accumulations were formed in more than two stages. The result shows that Kaili Residual
Reservoir has undergone the small scale hydrocarbon accumulation and destruction at the late Caledonian Period，large scale
oil pool formation at the Hercynian epoch，transformation from oil pool to gas pool at Indosinian and early-Yanshan period，
and the large scale destruction of reservoir from Mid-Yanshan period.

Key words: reservoir bitumen, oil seepage, geochemistry, hydrocarbon accumulation timing, Kaili Residual Reservoir

Gao Bo1*, Zhou Yan2, Wo Yujin2, Liu Quanyou2, Yuan Yusong2. Geochemical Research on the Multi-period Petroleum Accumulation of
Kaili Residual Reservoir[J]. 西南石油大学学报(自然科学版), DOI: 10.11885/j.issn.1674-5086.2012.12.27.01.

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