Diagenetic Sequence Stratigraphy Characteristics of Lower Cretaceous Bashijiqike Formation in Kuqa Depression
Diagenetic Sequence Stratigraphy Characteristics of Lower Cretaceous Bashijiqike Formation in Kuqa Depression
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发表时间：
2015
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通讯作者：
Lai Ji
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作者：
Lai Ji
摘要根据库车坳陷大北地区白垩系巴什基奇克组储层薄片、铸体薄片、x衍射和扫描电镜资料，从岩性、物性和储层空间等方面对其储层物性进行了探讨。结合元素捕获光谱（ECS）测井，对成岩作用及成岩矿物组合特征进行了研究。分析了巴二（巴什基奇克组二段）海侵体系域与巴一高地体系域的成岩作用差异。结果表明：薄剖面中普遍存在腐蚀现象，边界附近长石岩屑含量减少，层序边界附近物性改善；粘土含量在最大驱油面和层序边界处均较高，前者是由于沉积作用，后者是由于腐蚀后高岭土化作用。总体上，层序边界和体系域对碳酸盐岩胶结作用的控制作用不明显。层序各部位碳酸盐胶结物含量不同，与研究区碱性成岩环境有关。研究结果有利于储层的追踪和对比；这将指导油气勘探，促进层序地层学理论的发展。
On the basis of thin section,casting thin sections,X-diffration and scanning electron microscope data,this article discusses reservoir properties including lithology,physical property and reservoir space of the Cretaceous Bashijiqike Formation in Dabei area of the Kuqa Depression.Combining with Elemental Capture Spectroscopy(ECS)logging,diagenesis and characteristics of diagenetic mineral assembladges were studied.The difference of diagenesis between Ba 2(the second member of Bashijiqike Formation) transgressive system tract and Ba 1 highstand system tract is also analyzed.The results show that corrosion phenomena are widely observed in the thin sections,with the decrease of feldspathic litharenite content near the boundary and improvement of physical property near sequence boundary.The clay content is higher both at the maximum flooding surfaces due to deposition,and under the sequence boundaries due to kaolinization after corrosion.On the whole,the controls of sequence boundaries and system tracts on carbonate cementation are not obvious.Different contents of carbonate cement could be seen in every part of sequence,which are related to alkaline diagenetic environment of the study area.Study results are beneficial for the track and comparison of reservoirs;Moreover,these would direct the exploration of gas and promote the development of the sequence stratigraphy theory.