准噶尔盆地中央坳陷西部三叠系深层-超深层超压测井响应特征及成因

徐龙龙; 胡强; 刘建章; 肖雅文; 叶尔阿曼·达吾力

doi:10.19509/j.cnki.dzkq.tb20240560

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准噶尔盆地中央坳陷西部三叠系深层-超深层超压测井响应特征及成因

更新时间：2026-11-05

- 准噶尔盆地中央坳陷西部三叠系深层-超深层超压测井响应特征及成因
- Bulletin of Geological Science and Technology Vol. 44, Issue 4, Pages: 154-166(2025)
- 作者机构：
  
  1. 中国地质大学(武汉)构造与油气资源教育部重点实验室
  2. 中国地质大学(武汉)油气勘探开发理论与技术湖北省重点实验室
  3. 中国地质大学(武汉)资源学院
- 作者简介：
- 基金信息：
- DOI：10.19509/j.cnki.dzkq.tb20240560
  CLC： P631.81;P618.13
- Online First：09 June 2025，
  
  Published：09 June 2025
- 稿件说明：
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徐龙龙, 胡强, 刘建章, et al. 准噶尔盆地中央坳陷西部三叠系深层-超深层超压测井响应特征及成因[J]. Bulletin of Geological Science and Technology, 2025, 44(4): 154-166.
DOI：

徐龙龙, 胡强, 刘建章, et al. 准噶尔盆地中央坳陷西部三叠系深层-超深层超压测井响应特征及成因[J]. Bulletin of Geological Science and Technology, 2025, 44(4): 154-166. DOI： 10.19509/j.cnki.dzkq.tb20240560.

摘要

准噶尔盆地中央坳陷西部三叠系超压强度大且成因复杂，但目前对三叠系超压分布与成因的研究相对较薄弱。基于钻井液相对密度、实测地层压力及测井数据等资料，利用测井曲线组合、Bowers法和声波速度-密度交会等方法，分析了中央坳陷西部三叠系超压测井响应特征，探讨了超压成因及主控因素。研究表明，三叠系超压段泥岩具有高声波时差、低电阻率的特征；中子密度及中子孔隙度均偏离正常压实趋势线，但在不同井区偏离幅度有所差异。现今三叠系超压主要为不均衡压实作用和深部压力传导共同作用形成。受三叠系岩性组合特征、沉积速率及断裂活动强度的影响，不同井区不均衡压实型超压贡献度存在明显差异，克拉玛依组尤为显著：沙窝地地区最大，莫西庄地区有所减小，征沙村地区最小。研究成果深化了对准噶尔盆地中央坳陷西部深层-超深层超压成因机制的认识。

Abstract

ObjectiveOverpressure in the Triassic interval of the western Central Depression

Junggar Basin

shows high magnitudes and complex genesis. Current understanding of its distribution and origin remains limited. MethodsIntegrating data of drilling fluid relative density

measured formation pressure

and logging data

and utilizing methods of logging curve combination

the Bowers method

and acoustic velocity-density crossplots

this study characterizes the log response characteristics of Triassic overpressure in the western Central Depression

and investigates the genesis and main controlling factors of Triassic overpressure. ResultsThe mudstones of the Triassic overpressure section exhibit characteristics of elevated sonic time difference and reduced resistivity. The neutron density and neutron porosity of the mudstone deviate from the normal compaction trend line

but the degree of deviation spatially varies across different well areas. ConclusionThe current Triassic overpressure is mainly caused by the combined effects of disequilibrium compaction and deep-seated pressure transfer. Affected by the lithological assemblage

sedimentary rate

and fault activity intensity

the relative contribution of disequilibrium compaction to overpressure generation varies significantly between well areas. Particularly in the Karamay Formation: the Shawodi area exhibits the largest contribution

followed by the Moxizhuang area

and the Zhengshacun area shows the smallest contribution. The research results provide a deeper understanding of the mechanism of deep to ultra-deep overpressure in the western central depression

Junggar Basin.

关键词

Keywords

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