盆5井区块三工河组油气藏控制因素研究
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摘要
莫索湾油气田盆5井区块侏罗系三工河组(J1s2-2)油气藏为带油环的凝析气藏,油气藏顶部的气层分布较有规律,有统一的底界(-3 860 m),而在-3 860 m以下,位于构造北部的莫103、莫104、莫106和盆5井为油层,南部的莫101、莫102和莫105井为水层,油井与水井之间未发现明显的地质界限。结合地震剖面、沉积相、储集层结构等研究,该区J1s2-2是由分流河道间湾沉积形成的隔层使各单砂层呈叠瓦状前积结构,通过对隔层封堵性研究发现,隔层不能封隔气层,却能很好地封闭油层,由此确定了盆5井区块J1s2-2油气藏控制因素,气顶为构造气藏,油环为岩性构造油藏。
J_1S~(2-2) in Pen5 well block in Mosuowan Oil Field is a condensate gas reservoir with oil ring.Gas zones distribute uniformly on the top of the reservoir.They have a uniform bottom boundary(-3 860m).Below-3 860m,Well M103,M104,M106 and P5 in the north of the structure are oil zones,while M101,M102 and M105 in the south are water zones.No apparent geologic limit is found between oil and water wells.Study on seismic profile,sedimentary phase and reservoir structure shows that J_1S~(2-2) appears as imbricate progradation structure of single sandbody formed from distributive channels sedimented barriers.Study on sealing characteristics of barriers shows that,barriers cannot seal gas zones,but can seal oil zones.Thus the controlling effect of J_1S~(2-2) reservoir is determined.The gas cap is structural gas reservoir,and oil ring is lithologic-structural reservoir.
J_1S~(2-2) in Pen5 well block in Mosuowan Oil Field is a condensate gas reservoir with oil ring.Gas zones distribute uniformly on the top of the reservoir.They have a uniform bottom boundary(-3 860m).Below-3 860m,Well M103,M104,M106 and P5 in the north of the structure are oil zones,while M101,M102 and M105 in the south are water zones.No apparent geologic limit is found between oil and water wells.Study on seismic profile,sedimentary phase and reservoir structure shows that J_1S~(2-2) appears as imbricate progradation structure of single sandbody formed from distributive channels sedimented barriers.Study on sealing characteristics of barriers shows that,barriers cannot seal gas zones,but can seal oil zones.Thus the controlling effect of J_1S~(2-2) reservoir is determined.The gas cap is structural gas reservoir,and oil ring is lithologic-structural reservoir.
引文
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[2]杨文孝,赵铮亚.准噶尔盆地侏罗系勘探进展及成藏特征[J].新疆石油地质,2002,23(6):469.
[3]冯国庆,陈军,张烈辉,等.莫北2井区侏罗系三工河组油藏数值模拟[J].新疆石油地质,2004,25(1):55-58.
[4]德勒达尔,张有平.莫索湾地区侏罗系三工河组储集层沉积及成岩特征[J].新疆石油地质,2003,24(3):271.
[5]潘钟祥.石油地质学[M].北京:地质出版社,1986.190.
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