沙湾组油气地质特征与勘探实践
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摘要
准噶尔盆地沙湾组以岩性油气藏为主,存在油砂体规模较小、油层薄、储层岩性变化快等勘探难题。2005年,排2井在沙湾组钻遇油层,日产油49.6 t,地面原油粘度为1.6 mPa.s。立足实践、大胆开拓促成了沙湾组浅层、稀油、高产岩性油藏的突破,高精度三维地震技术发挥了关键作用。车排子地区具有多油源输导、多层系含油、多类型富集、多品位共存的复式聚集特点和"三层楼"油气成藏模式。沙湾组轻质油藏油砂体形态与振幅属性具有较好的对应关系,能够通过地震属性有效识别油水边界。稀油油浸为含油性下限,粉细砂岩为岩性下限,渗透率0.022μm2、孔隙度20%为物性下限,油层声波时差大于300μs/m,电阻率大于1.5Ω.m,电阻增大率大于5.5。已发现沙湾组油藏23个。
Shawan exploration of Juggar Basin was faced with exploration problems of small scale oil sand,thin reservoir and rapid changes in lithology.In 2005,Pai 2 Well in Shawan formation drilled oil layer.It obtains 49.6 t/d industrial oil and the ground oil viscosity is 1.6 mPa·s.Practice and boldly exploiting contributes to Shawan's breakthrough of shallow,light oil and high lithologic oil reservoir,and high-precision three-dimensional seismic technology has played a crucial role.Chepaizi region of Shawan formation has double-gathered and the "three floors" oil and gas accumulation mode of multiple oil source transporting,multi-line oil,multi-type enrichment and multi-grade coexistence characteristics.Shawan's light oil sand body shape has a good corresponding relationship with amplitude property,and the oil-water boundary can be identified by seismic attributes.Oil of thin oil is oil lower limit,and powder and fine sandstone is lithologic lower limit,permeability of 0.022 μm2 and porosity of 20 % is lower limit for the properties.Reservoir interval transit time is greater than 300 μs/m,resistivity is greater than 1.5 Ω·m and resistivity index is greater than 5.5.23 reservoirs have been found in Shawan.
Shawan exploration of Juggar Basin was faced with exploration problems of small scale oil sand,thin reservoir and rapid changes in lithology.In 2005,Pai 2 Well in Shawan formation drilled oil layer.It obtains 49.6 t/d industrial oil and the ground oil viscosity is 1.6 mPa·s.Practice and boldly exploiting contributes to Shawan's breakthrough of shallow,light oil and high lithologic oil reservoir,and high-precision three-dimensional seismic technology has played a crucial role.Chepaizi region of Shawan formation has double-gathered and the "three floors" oil and gas accumulation mode of multiple oil source transporting,multi-line oil,multi-type enrichment and multi-grade coexistence characteristics.Shawan's light oil sand body shape has a good corresponding relationship with amplitude property,and the oil-water boundary can be identified by seismic attributes.Oil of thin oil is oil lower limit,and powder and fine sandstone is lithologic lower limit,permeability of 0.022 μm2 and porosity of 20 % is lower limit for the properties.Reservoir interval transit time is greater than 300 μs/m,resistivity is greater than 1.5 Ω·m and resistivity index is greater than 5.5.23 reservoirs have been found in Shawan.
引文
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[2]王连芳.解放前我国学者对新疆石油地质的调查和研究[J].新疆石油地质,20022,3(5):439-441.
[3]新疆油气区石油地质志编写组.中国石油地质志.卷十五.新疆油气区.准噶尔盆地[M].北京:石油工业出版社.1993:8,9,30,385-386.
[4]党玉芳,尚春,宁良.物探新技术在准噶尔盆地车排子地区浅层油气勘探中的应用[J].天然气工业,2007,27(增刊A):486-488.
[5]付广,孙永河,吕延防.输导通道类型对天然气聚集效率的影响[J].地质论评2,006,52(2):236-242.
[6]马宗晋,曲国胜,李涛.准噶尔盆地盆山构造耦合与分段性[J].新疆石油地质2,008,28(3):271-277.
[7]邱楠生,杨海波.准噶尔盆地构造——热演化特征[J].新疆石油地质,2002,37(4):423-439.
[8]杨藩,唐文松,魏景明.中国油气区第三系——西北油气区分册[M].北京:石油工业出版社1,994.
[9]洪太元,张福顺,由伟丰.准噶尔盆地车排子地区排2井地层划分[J].中国西部油气地质,2005,1(1):22-25.
[10]邢凤存,陆永潮,刘传虎.车排子地区构造-古地貌特征及其控砂机制[J].石油与天然气地质,2008,29(1):78-83,106.
[11]王振奇,支东明,张昌民.准噶尔盆地西北缘车排子地区新近系沙湾组油源探讨[J].中国科学D辑:地球科学,2008,38(增刊):97-104.
[12]张枝焕,秦黎明.准噶尔盆地腹部车莫古隆起南北两侧含油构造油源及烃源灶转移[J].中国地质,2009,36(4):826-836.
[13]王学忠,刘传虎,王建勇.应用三维地震属性识别春光油田原始油水界面[J].特种油气藏2,009,16(3):48-495,2.
[14]汪彩云.地震技术在车排子地区岩性油藏勘探中的应用[J].勘探地球物理进展,20092,(4):280-285.
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