西地地区石炭系火山岩油气成藏模式研究
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摘要
准噶尔盆地北三台凸起西地地区石炭系火山岩发育区油气勘探程度较低,虽目前有所突破,但正确认识该地区石炭系火山岩成藏模式对油气勘探有重要意义。利用地震、测井、钻井、岩心等资料,综合分析认为石炭系火山岩油气藏受构造控制,石炭系风化壳古构造影响储集层物性,现今构造决定油气藏分布范围,同时充足的油源供给以及良好的盖层条件是成藏的必备因素。研究区油气主要来源于石炭系烃源岩自生和二叠系平地泉组烃源岩油气"倒灌",平地泉组不仅是好的生油岩也是良好的区域盖层;油气藏主要分布在石炭系顶面风化壳,储层储集空间主要为次生孔隙和裂缝;油气运移通道主要为深大断裂及石炭系风化壳层。研究区火山岩油气藏类型为背斜型、断块型、异常体型。
For the Carboniferous volcanic rock in Xidi area in Beisantai Uplift, Junggar Basin, the exploration degree is a little low. Even though it makes a breakthrough at present, it is very meaningful to understand the reservoir-forming pattern for this Carboniferous volcanic-rock reservoir. After a comprehensive analysis on seismic, well-logging, drilling, and core data, it is deemed that the reservoir is affected by structure; Carboniferous weathering crust palaeo- structure impacts on petrophysical properties; the present- day structure determines the scope of reservoir distribution; and sufficient oil source supply and better caprocks are fundamental factors for forming reservoir. In this study, oil and gas are mainly come from source rock of both Carboniferous and Permian Pingdiquan Formation, in which the latter is not only better oil source rock but also regional caprock. Moreover, oil and gas reservoirs are distributed at top Carboniferous weathering crust, and reservoir space includes secondary pore and fracture. Migration pathway contains deep and large fault system and weathering crust.Some types may be found, such as anticlinal reservoir, fault block reservoir, and abnormal shape reservoir.
引文
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