Genesis of Tilted Oil-Water Contact of Heavy Oil Reservoir in Shawan Formation, Chunfeng Oilfield, Junggar Basin

doi:10.7657/XJPG20240209

Abstract

Abstract:

The oil-water relationship of the heavy oil reservoir in the first member of the Neogene Shawan formation （Sha 1 member） in Chunfeng oilfield is complex and cannot be explained from the traditional viewpoint of oil-water contact （OWC）, which affects the exploration and development process of the oilfield. Taking the P601-20 block with prominent contradiction in oil-water relationship as an example, researches on seismic-geology and pool-forming dynamics were conducted, and combining with the reservoir performance during development, the oil-water relationship of the heavy oil reservoir in Sha 1 member and its genesis were analyzed. It is found that the complex oil-water relationship in this oilfield is caused by the presence of a tilted OWC in the reservoir which is a structural-lithological reservoir with bottom/edge water. In terms of reservoir physical property, fault, formation pressure, tectonic movement, etc., the presence of the tilted OWC should be attributed to the adjustment of the reservoir due to tectonic movements, and the crude oil densification and flat strata intensified the lag of OWC adjustment. This reservoir can be classified as an unsteady oil and gas reservoir.

Key words: Junggar basin, Chepaizi swell, Chunfeng oilfield, Shawan formation, heavy oil reservoir, oil-water relationship, tilted oil-water contact, unsteady oil and gas reservoir

CLC Number:

TE122.3

ZHANG Deyao. Genesis of Tilted Oil-Water Contact of Heavy Oil Reservoir in Shawan Formation, Chunfeng Oilfield, Junggar Basin[J]. Xinjiang Petroleum Geology, 2024, 45(2): 205-212.

Figures/Tables 6

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Table 1.

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井名	油水界面/m		井名	油水界面/m		井名	油水界面/m
井名	测深	海拔	井名	测深	海拔	井名	测深	海拔
P601-P420DY井	410.3	-122.8	P601-28井	431.7	-145.7	P601-25井	466.8	-178.1
P601-22井	413.0	-126.0	P601-24井	437.3	-149.1	P601-JX11井	472.6	-181.8
P601-27井	423.5	-138.3	P601-20井	442.9	-156.5	P601-21井	486.0	-199.2
P601-X467井	473.0	-139.8	P601-525井	453.5	-167.4	P611井	487.8	-200.3
P601-23井	425.3	-140.5	P601-26井	456.0	-168.4	P601-J12井	499.3	-210.4