塔中地区石炭系主要断层的侧向封闭性

LATERAL SEALING OF MAJOR FAULTS IN CARBONIFEROUS IN TAZHONG AREA.

在研究塔中地区断裂发育特征的基础上，根据泥岩涂抹系数定义，对研究区几条主要断层在石炭系中的泥岩涂抹系数进行了计算，结果表明，除Ｆ２断层泥岩涂抹系数大于４，所形成的泥岩涂抹层空间分布连续性相对较差，侧向封闭性不好，不利于油气聚集成藏外，其余几条断层（Ｆ３、Ｆ４、Ｆ５）泥岩涂抹系数均小于４，所形成的泥岩涂抹层空间分布的连续性相对较好，侧向封闭性好，为塔中地区石炭系油气聚集成藏起到了重要作用。

Based on the study on features of developed faults in Tazhong area, this paper calculated the mudstone smearing coefficient of major faults in Carboniferous within study area according to the definition of mudstone smearing coefficient. The results showed that the mudstone smearing coefficients of F3, F4 and F5 faults are all less than 4, while that of F2 fault is more than 4, so the distribution continuity of mudstone smearing layers of F3, F4 and F5 faults and their lateral sealing are better than that of F2 fault, thus playing an important role in hydrocarbon accumulation and forming reservoirs of Carboniferous in Tazhong area.