Remaining Oil Prediction Based on Comprehensive Geological Analysis Methods
Received date: 2005-09-06
Revised date: 2006-03-09
Online published: 2006-05-15
A method for remaining oil prediction is proposed based on comprehensive geological analysis method. The method incudes 3 steps as following:(1)founding geological data base;(2)founding the reservoir architectural model and (3) analyzing the production characteristics of the reservoir based on the basic unit of architectural elements and predicting the high potential areas of remaining oil. Such things as the correlation of the lithofacies and well-logs, the geometry character parameter are included in the geological data base. Reservoir architectural model is established, and the characteristics of model are analyzed. The study shows that there are obvious difference in the output, injection sweptment and the controlled level in different architectural elements. The connecting patterns are also an important factor that influences the subsurface fluid flow. Distributary channel sandbodies, which are always with larger scale and better petrophysical, are not rich in remaining oil; gravity sandbodies and over-bank sandbodies are rich in remaining oil for its smaller scale and poorer petrophysical properties. Small scaled mouth-bar sandbodies can also be rich in remaining oil if they are not controlled by present well-net. Sheet-like sandbodies are also rich in remaining oil for its poor properties though they are always widely spread. There are two types of remaining oil distribution pattern, one of which is mainly in little sandbodies which are not controlled well by well net, and the other is mainly in the poor sanbodies auch as sheet-like sandbody.
YIN Tai-ju , ZHAO Hong-jing , ZHANG Chang-min . Remaining Oil Prediction Based on Comprehensive Geological Analysis Methods[J]. Advances in Earth Science, 2006 , 21(5) : 539 -544 . DOI: 10.11867/j.issn.1001-8166.2006.05.0539
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