摘要
针对准噶尔盆地南缘前陆冲断带地层超压在纵向和横向上的差异分布问题,开展超压成因判识、超压演化模拟研究。利用实测地层压力、钻井液密度、测井等资料和超压成因判识及超压演化模拟技术,分析超压在纵向上和横向上的分布规律,讨论不同构造带超压成因机制及超压在纵横向上差异分布的原因,探讨超压发育演化对油气藏形成和分布的控制作用。研究表明,准南前陆冲断带超压在纵向上多层系发育、越深超压规模越大,横向上超压在山前带最不发育,褶皱背斜带最发育、斜坡区较发育。超压差异分布主要受控于不同区带的不均衡压实作用和构造挤压作用强度的差异。沟通深部超压层系的断层造成的超压传递作用对该区超压幅度的进一步增大有重要贡献。超压形成演化对油气成藏和分布的控制作用,具体表现在:当强超压形成于储集层致密化之前,超压对深层储集层物性具有一定保持作用,拓展了深层—超深层的勘探深度;古近系安集海河组和下白垩统吐谷鲁群超压泥岩盖层之下是油气规模富集的主要场所;在总体超压的背景下,超压强度太高或太低均不利于油气富集与保存,压力系数以1.6~2.1最好。
Aiming at the differential distribution of overpressure in vertical and lateral directions in the foreland thrust belt in the southern margin of Junggar Basin, the study on overpressure origin identification and overpressure evolution simulation is carried out.Based on the measured formation pressure, drilling fluid density and well logging data, overpressure origin identification and overpressure evolution simulation techniques are used to analyze the vertical and lateral distribution patterns of overpressure, genetic mechanisms of overpressure in different structural belts and causes of the differential distribution of overpressure, and the controlling effects of overpressure development and evolution on the formation and distribution of oil and gas reservoirs. The research shows that overpressure occurs in multiple formations vertically in the southern Junggar foreland thrust belt, the deeper the formation, the bigger the scale of the overpressure is. Laterally, overpressure is least developed in the mountain front belt, most developed in the fold anticline belt,and relatively developed in the slope belt. The differential distribution of overpressure is mainly controlled by the differences in disequilibrium compaction and tectonic compression strengths of different belts. The vertical overpressure transmission caused by faults connecting the deep overpressured system has an important contribution to the further increase of the overpressure strength in this area.The controlling effect of overpressure development and evolution on hydrocarbon accumulation and distribution shows in the following aspects: When the strong overpressure was formed before reservoir becoming tight overpressure maintains the physical properties of deep reservoirs to some extent, expanding the exploration depth of deep and ultra-deep reservoirs;reservoirs below the Paleogene Anjihaihe Formation and Lower Cretaceous Tugulu Group overpressure mudstone cap rocks are main sites for oil and gas accumulation;under the background of overall overpressure, both overpressure strength too high or too low are not conducive to hydrocarbon enrichment and preservation, and the pressure coefficient between 1.6 and 2.1 is the best.
作者
鲁雪松
赵孟军
张凤奇
桂丽黎
刘刚
卓勤功
陈竹新
LU Xuesong;ZHAO Mengjun;ZHANG Fengqi;GUI Lili;LIU Gang;ZHUO Qingong;CHEN Zhuxin(Research Institute of Petroleum Exploration&Development,PetroChina,Beijing 100083,China;Key Laboratory of Basin Structure and Hydrocarbon Accumulation,CNPC,Beijing 100083,China;School of Earth Sciences and Engineering,Xi’an Shiyou University,Xi’an 710065,China)
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
2022年第5期859-870,共12页
Petroleum Exploration and Development
基金
中国石油科技开发项目(2021DJ0105,2021DJ0203,2021DJ0303)
国家自然科学基金(42172164,42002177)。
关键词
异常高压
超压成因
构造挤压
超压传递
油气成藏
前陆冲断带
准噶尔盆地
abnormally high pressure
overpressure origin
tectonic compression
overpressure transmission
hydrocarbon accumulation
foreland thrust belt
Junggar Basin
