新疆石油地质

新疆石油地质 ›› 1994, Vol. 15 ›› Issue (3): 208-213.

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准噶尔盆地莫索湾地区异常地层压力与油气聚集

吴晓智, 李策   

  1. 第一作者:工程师, 石油地质, 新疆石油管理局勒探开发研究院 克拉玛依 834000
  • 收稿日期:1993-12-08 出版日期:1994-09-01 发布日期:2020-07-22

ABNORMAL PRESSURE AND HYDROCARBON ACCUMULATION IN MOSUOWAN AREA OF HINTERLAND OF JUNGGAR BASIN

Wu xiaozhi, Li Ce   

  1. First Author:Engiaeer, Petroleum Geology, Research institute of Erploration & Developmenu, Xinjuang Petroleun Administratson Buroau，Karamag 834000
  • Received:1993-12-08 Online:1994-09-01 Published:2020-07-22

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摘要： 准噶尔盆地腹部莫索湾地区盆参2井于4500m和5700m深处侏罗系内存在异常高压层。根据异常地层压力形成理论、烃类有机成因理论、油气分带模式，探讨了异常地层压力的成因：岩性封闭是先决条件，粘土矿物成岩后生期释放大量层间水，下侏罗统生油层进入低成熟阶段，造成流体增温增压，形成一温跃层，导致异常高压出现。受温压条件控制，勘探目的层侏罗系存在明显的油气分带性：封闭层之上为石油聚集带，之下为凝析油、天然气聚集带。4500m封闭层以上的侏罗系应是目前勘探的主要对象。

关键词: 准噶尔盆地腹部, 盆参2井, 异常地层压力, 油气分带, 地质风险评价

Abstract: Jurassic abnormally high pressure zones were discovered at a depth 4 500 m and 5 700 m of Well Pencan 2 in Mosuowan area of hinterland of Junggar basin. This paper discusses the origins of abnormal formation pressure, based on the theory on formation of abnormal formation pressure, organic theory and the model of hydrocarbon Zonation. It is suggested that the lithologic seal is the prerequisite, release of abundant interformational water from clay minerais during katagenesis petriod and lower maturation phase of Lower Jurassic source bed resulted in increase in fluid temperature and pressure，and then abnormally high pressure as well as a temperature-active zone were establish. Controlled by the temperature and pressure conditions, oil/gas zonation conspicuously occurs in exploration target zone(Jurassic); oil accumulation zone and condensate or natural gas accumulation zone exist above and beneath the seal, respectively. Finally, it is concluded that the Jurassic underlain by the seal at 4 500m should be considered to be main candidatc for exploration.

Key words: Hintcrland of Junggar basin, Well Pencan 2, Abnormal formation pressure, Oil/gas zoning, Geologic risk evaluation