准噶尔盆地东部阜东斜坡带头屯河组粘土矿物特征

准噶尔盆地东部阜东斜坡带中侏罗统头屯河组储集层受敏感性影响比较大。影响敏感性的主要因素为粘土矿物类型及其含量，因而有必要利用岩石薄片、铸体薄片、X-衍射和扫描电镜等多种分析手段，对多口井的储集砂岩粘土矿物各项特征及其对储层敏感性的影响展开深入研究。结果表明：①头屯河组储集砂岩的粘土矿物类型多样，同时发现粘土薄膜厚度与产能有一定关系；②物源决定研究区粘土矿物成分，沉积背景、气候变化以及后期断裂构造为储集层中粘土矿物的转化及保存创造条件；③异常压力影响了粘土矿物分布；④头屯河组储集砂岩的敏感性以水敏为主，其次为速敏和酸敏，敏感性程度和粘土矿物含量有关。上述认识为阜东斜坡带头屯河组钻、注、采工艺实施提供有关储层保护和改造的地质依据。

Characterization of clay minerals in Toutunhe Formation of Fudong slope area in eastern Junggar Basin

The Toutunhe Formation of the Middle Jurassic is the main exploration layer in Fudong slope area in Junggar Basin,where reservoirs are greatly influenced by sensitivity to clay minerals.Contents and types of clay minerals of the reservoirs are the major factors that influence sensitivity,thus were studied through cast thin section,rock thin section,X-ray diffraction and SEM.The result shows that ①various types of clay minerals can be observed and the thickness of clay membrane is related to some extent with productivity;②components of the clay minerals were determined by provenance,and sedimentary setting,climate change and later faulting helped transformation and preservation of the clay minerals;③abnormal pressure affects the distribution of the clay minerals;④the reservoirs are mostly water-sensitive and also acid-and speed-sensitive to some extent.The degree of sensitivity depends on the content of different types of clay minerals.The above understanding has been used as geologic basis for reservoir protection and modification during drilling,injection and production operation in the Formation.