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目的 为更好地勘探桥口构造含气层沙三段中下部的天然气,研究了影响气藏的诸因素。方法利用薄片观察统计和X衍射分析,对桥口构造沙三3 4亚段气藏岩性特征、沉积相特征进行了研究。结果 该区含气层段具砂层厚度薄,粒度细,沉积相变快,埋藏深度大,储层物性纵、横向差异明显的储集特点;影响含气层段的储集因素包括岩石学组分、沉积相、砂体展布、成岩作用及物性等;沉积相是最主要的因素,以重力流沉积为主;好的储集体主要有湖底扇中扇辫状水道砂体和轴向重力流水道砂体。结论 通过以上研究,结合气源条件,指出该地区天然气勘探的方向应为桥东斜坡带。
Aim In order to better explore the structure of natural gas in the middle and lower parts of Shahejie Formation in Qiaokou, the factors influencing gas reservoirs were studied. Methods The lithology characteristics and sedimentary facies characteristics of the gas reservoir in Sands 34 4 in Qiaokou were studied by using the observation statistics and X-ray diffraction analysis. As a result, the gas-bearing intervals in the gas-bearing intervals of the gas-bearing intervals are thin and fine sandstones with fine grain size, rapid depositional facies, large burial depths, and vertical and horizontal reservoir physical properties. Reservoir factors that affect the gas-bearing intervals include petrology Sedimentary facies, diagenesis and physical properties etc .; sedimentary facies is the most important factor, mainly gravity flow deposition; good reservoirs are mainly fan-braided channel sand body in the sublacustrine fan and axial Gravity flow channel sand body. Conclusions Through the above research, combined with the gas source conditions, it is pointed out that the direction of natural gas exploration in this area should be the Qiaodong slope zone.