HYDROCARBON COMPOSITIONAL HETEROGENEITIES OF PETROLEUMRESERVIOIRS IN LUDONG DEPRESSION AND ITS GEOLOGICAL SIGNIFICANCE
Received date: 2003-09-04
Revised date: 2003-09-25
Online published: 2003-12-20
The bulk composition (proportion of saturated hydrocarbons, aromatic hydrocarbons and polar compounds) of crude oils and oilsands in Ludong depression is fairly heterogeneous throughout the field. In high-porosity sandstones(>15%), the proportion of saturated hydrocarbons amounts to about 50% of the total extract, which is also similar to the well-head oils, where the low-porosity(<10%) sandstones contain only 30% saturated hydrocarbons. The proportion of polar compounds reveals an opposite trend and changes from 30% to about 50% from the high- to the low-porosity areas. Likewise the mature parameters of crude oils and oilsands in Ludong depression reveal a wide range of variation. More mature residual oils in high-porosity versus low mature residual oils in low-porosity sandstones. The observed compositional variations between high and low porosity reservoirs in Ludong depression are most likely due to petroleum fluids derived from different stage of generation history in same source rocks.
ZHANG Min, ZHANG Chun-ming, FENG Min, LIU Qing-xin . HYDROCARBON COMPOSITIONAL HETEROGENEITIES OF PETROLEUMRESERVIOIRS IN LUDONG DEPRESSION AND ITS GEOLOGICAL SIGNIFICANCE[J]. Natural Gas Geoscience, 2003 , 14(6) : 488 -491 . DOI: 10.11764/j.issn.1672-1926.2003.06.488
［1］Leythaeuser D, Ruckheim J. Heterogeneity of oil composition within a reservoir as a reflection of accumulation history［J］. Geochim. Cosmochim. Acta. 1989, 53: 2119-2123.
［2］England W A, Mannn D M, Quigley T M. The movement and entrapment of petroleum fluids in the subsurface［J］. Journal of the Geological Society, London，1987，144：327-347.
［3］England W A. The organic geochemistry of petroleum reser- voirs［J］. Org. Geochem., 1990, 16: 15-425.
［4］Ahsan S A, Karlsen D A, Mitchell A W, et al. Inter and int- rafield hydrocarbon compositional variations in the Ula and the Gyda fields(Central Graben-North Sea) implication for understanding the controls on hydrocarbon distribution within and between these fields［J］. Org. Geochem., 1998, 29: 449-462.
［5］Cubitt J M, England W A . The Geochemistry of Reservoirs[C]. Geological Society Special publication,1995.
［6］Karlsen D A, Larter S R. Analysis of petroleum fraction by TLC-FID: Applications to petroleum reservoir description［J］. Org. Geochem., 1991, 17: 603-617.
［7］Horstad I, Larter S R, Dypvik H, et al. Degradation and maturity controls on oil field petroleum column heterogeneity in the Gullfaks field, Norwegian North Sea［J］. Org. Geochem., 1990, 16: 497-510.
[8] 朱扬明，张敏，徐中一. 油藏非均质性及聚油史初探［J］.石油实验地质，1996，18(2)：497-510.
/
| 〈 |
|
〉 |
甘公网安备 62010202000678号