春风油田沙湾组稠油油藏倾斜油水界面成因

doi:10.7657/XJPG20240209

摘要/Abstract

摘要：

春风油田新近系沙湾组一段稠油油藏油水关系复杂，运用传统油水界面观点难以解释，影响该油田勘探开发进程。以油水关系矛盾突出的P601-20区块为例，开展地震-地质综合研究及成藏动力学研究，结合油藏开发动态资料，分析春风油田沙湾组一段稠油油藏油水关系及其成因。研究认为：该油田油水关系复杂是由于油藏存在倾斜油水界面，其油藏类型仍然为构造-岩性油藏，并且存在边底水；储集层物性、断层、地层压力、构造运动等方面，形成倾斜油水界面的主要原因是构造运动导致油藏调整，原油稠化和地层构造平缓加剧了油水界面调整滞后，该油藏属于非稳态油气藏。

关键词: 准噶尔盆地, 车排子凸起, 春风油田, 沙湾组, 稠油油藏, 油水关系, 倾斜油水界面, 非稳态油气藏

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

中图分类号:

TE122.3

张德尧. 春风油田沙湾组稠油油藏倾斜油水界面成因[J]. 新疆石油地质, 2024, 45(2): 205-212.

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.

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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