摘要
YB地区吴家坪组气藏仅1口井（YB29井）获低产工业气流，酸化后获超100×104 m3高产工业气流，其余井均为干层。与上覆长兴组储层相比，总体勘探效果明显变差，储层硅质、泥质含量较重，其储层性能、成藏的控制因素和影响作用认识不清。为理清彼此间的关系、明确影响吴家坪组勘探效果的主控因素，文中开展了地质、测井、地震的联合分析。首先，从地质上对储层宏观分布规律及微观特征进行分析，再利用“高泥质含量对应高伽马，高硅质含量对应低密度、低速度、中高声波且声波频繁跳跃”的测井响应特征，摸索出一套剔除泥质、硅质影响的储层物探精细刻画技术。综合研究表明，吴家坪组有效储层仅在局部古地貌高点区发育，整体上薄而分散，物性及储集空间类型差，非均质性强，油气富集程度低，是吴家坪组整体勘探效果较长兴组变差的主控因素。
Abstract
Wujiaping Formation gas reservoir of YB Area in Sichuan has low industrial yields through conventional test. High industrial yields after acidification to Well YB29, and the other wells are dry layers. Compared with the overlying reef reservoirs of huge gas field of Changxing Formation, the overall effect is worse, the siliceous and shale content of Wujiaping reservoir is much heavier, but its reservoir properties, hydrocarbon accumulation and its effect are not clear. To clarify the relationship and the controlling factors of Wujiaping exploration effect, the joint analysis of geology, logging and seismology was carried out. First, macro-and micro-characteristics were analyzed from geology; second, using logging response characteristics of "high shale content corresponding to the high-gamma, high siliceous content corresponding to low-density, low-speed, middle-high sound waves and wave jump", a set of reservoir geophysical fine characterization techniques by rejecting siliceous and shale effect was worked out. Comprehensive analysis shows that Wujiaping top reservoir developed only in high palaeogeomorphic point with the characteristics of thin formations, dispersed reservoirs, poor physical properties, strong heterogeneity, and low hydrocarbon accumulation. The above factors lead to poor exploration effect in Wujiaping Formation compared with Changxing Formation.
论文详情